Home ReviewsRefund
Home/Cadillac/ATS/Cadillac ATS I (2012-2014)/Repair manual/Testing & Diagnostics/Engine Controls/fuel - 2.0l (Ltg) or 2.5l (Lcv) - DTC p0010…
Contents Wiring diagrams Section: Testing & Diagnostics All sections

Engine Controls/fuel - 2.0l (Ltg) or 2.5l (Lcv) - DTC p0010 to DTC p0411 Cadillac ATS I

Testing & Diagnostics ~53591 words

Diagnostic Instructions

  1. Perform the «Diagnostic System Check Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-system-check-instructions) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Camshaft Position Actuator Solenoid Valve High ControlP0010, P0013, P2088, P2090P0010, P0013P0010, P0013P0010, P0013, P2089, P2091P0011, P0014
Camshaft Position Actuator Solenoid Valve Low ReferenceP0010, P0013P0010, P0013

Circuit/System Description

The camshaft position actuator system enables the engine control module (ECM) to change the timing of the camshafts while the engine is operating. The camshaft position actuator solenoid valve signal from the ECM is pulse width modulated (PWM). The ECM controls the camshaft position actuator solenoid valve duty cycle by controlling the amount of solenoid valve On time. The camshaft position actuator solenoid valve controls the advance or the retard of each camshaft. The camshaft position actuator solenoid valve controls the oil flow that applies the pressure to advance or retard the camshafts.

The ECM controls the camshaft position actuator solenoid valve by supplying a 12 V pulse width modulated (PWM) signal. The ECM supplies a ground to the low reference circuit.

Conditions for Running the DTC

  1. The ignition voltage is greater than 11 V.
  2. The ECM has commanded the camshaft position actuator solenoid valve On.
  3. the DTCs are run continuously once the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

Action Taken When the DTC Sets

DTCs P0010, P0013 and P2088 - P2091 are type B DTCs.

Conditions for Clearing the DTC

DTCs P0010, P0013 and P2088 - P2091 are type B DTCs.

Diagnostic Aids

If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool Circuit Test Status parameters for the component. The Circuit Test Status parameters change from OK or Not Run to Malfunction if there is a condition with the circuit or a connection.

Reference Information

Schematic Reference

Connector End View Reference

Component View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Ignition On.
  2. Verify DTC P0335, P0336, P0340, or P0341 is not set. If any of the DTCs are set If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
  3. Verify the scan tool parameters listed below do not display Malfunction: Intake Camshaft Position Actuator Solenoid Valve Control Circuit Open test status Intake Camshaft Position Actuator Solenoid Valve Control Circuit High Voltage test status Intake Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage test status Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Open test status Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit High Voltage test status Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage test status If Malfunction is displayed Refer to Circuit/System Testing If Malfunction is not displayed
  4. Engine idling at normal operating temperature.
  5. Verify the scan tool parameters listed below do not display Malfunction when commanding the appropriate scan tool Camshaft Position Actuator from 0-10° and back to 0° with a scan tool: Intake Camshaft Position Actuator Solenoid Valve Control Circuit Open test status Intake Camshaft Position Actuator Solenoid Valve Control Circuit High Voltage test status Intake Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage test status Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Open test status Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit High Voltage test status Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage test status If Malfunction is displayed Refer to Circuit/System Testing If Malfunction is not displayed
  6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  7. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing If the DTC does not set
  8. All OK.

Circuit/System Testing

  1. Ignition Off and all vehicle systems Off, disconnect the appropriate harness connector at the Q6 Camshaft Position Actuator Solenoid Valve. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 5 ohms between the low reference circuit terminal B or 2 and ground. If 5 ohms or greater Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
  3. Ignition On.
  4. Verify that a test lamp does not illuminate between the control circuit terminal A or 1 and ground. If the test lamp illuminates Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If the test lamp does not illuminate
  5. Remove the test lamp.
  6. Connect the DMM negative lead to the control circuit terminal A or 1. Connect the DMM positive lead to B+. Set the DMM on the diode setting. Command the Camshaft Position Actuator Solenoid Valve On and Off with a scan tool. The DMM should transition from OL when commanded Off to less than 1 V when commanded On. If the circuit voltage does not correspond to the specified values Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit If less than 2 ohms Test for infinite resistance between the control circuit terminal A or 1 and ground. If less than infinite resistance, repair the short to ground in the circuit If infinite resistance, replace the K20 Engine Control Module If the circuit voltage corresponds to the specified values
  7. Test or replace the appropriate Q6 Camshaft Position Actuator Solenoid Valve.

Component Testing

  1. Ignition Off, disconnect the harness connector at the appropriate Q6 Camshaft Position Actuator Solenoid Valve.
  2. Test for 4.1-7.7 ohms between the control terminal A or 1 and the low reference circuit terminal B or 2 If not between 4.1-7.7 ohms Replace the Q6 Camshaft Position Actuator Solenoid Valve. If between 4.1-7.7 ohms
  3. Test for infinite resistance between each terminal and the Q6 Camshaft Position Actuator Solenoid Valve housing. If not infinite resistance Replace the Q6 Camshaft Position Actuator Solenoid Valve. If infinite resistance
  4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Camshaft Position Actuator Intake Solenoid Valve Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Camshaft Position Actuator Exhaust Solenoid Valve Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming, and setup
  1. Perform the «Diagnostic System Check Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-system-check-instructions) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Camshaft Position Actuator Solenoid Valve High ControlP0010, P0013, P2088, P2090P0010, P0013P0010, P0013, P055BP0010, P0013, P2089, P2091P0011, P0014
Camshaft Position Actuator Solenoid Valve Low ReferenceP0010, P0013P0010, P0013

The camshaft position actuator system enables the engine control module (ECM) to change the timing of the camshafts while the engine is operating. The camshaft position actuator solenoid signal from the ECM is pulse width modulated (PWM). The ECM controls the camshaft position actuator solenoid duty cycle by controlling the amount of solenoid on time. The camshaft position actuator solenoid controls the advance or the retard of each camshaft. The camshaft position actuator solenoid controls the oil flow that applies the pressure to advance or retard the camshafts.

  1. DTC P0010, P0013, P0016, P0017, P0335, P0336, P0340, P0341, P0365, or P0366 is not set.
  2. The ignition voltage is greater than 11 V.
  3. The engine is operating.
  4. The desire camshaft position is not changing greater than 3.0 degrees for at least 3 s.
  5. Both of the desired and actual camshaft position actuator values cannot be greater than 29 degrees or less than 6 degrees.
  6. DTCs P0011 and P0014 run continuously once the above conditions are met.

The ECM detects the difference between the desired camshaft position angle and the actual camshaft position angle is greater than 6 degrees for greater 13.5 s.

  1. DTCs P0011 and P0014 are Type B DTCs.
  2. The Auto Stop and Auto Start function of the hybrid system is disabled.

DTCs P0011 and P0014 are Type B DTCs.

  1. The engine oil condition has a major impact on the camshaft actuator system.
  2. A low oil level condition may set this DTC. The engine may require an oil change. Inquire with the customer when the last oil change was performed. You may also monitor the scan tool Engine Oil Life Remaining parameter. Advise the customer an oil change may be required.
  3. Inspect the engine for any recent engine mechanical repairs. An incorrectly installed camshaft, camshaft actuator, or timing chain can cause this DTC to set.

Schematic Reference

Connector End View Reference

Component View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition On.
  2. Verify the engine has the correct oil level and pressure. Refer to «Oil Pressure Diagnosis and Testing»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures__oil-pressure-diagnosis-and-testing) . If the oil level and the oil pressure are not correct Repair as necessary If the oil level and the oil pressure are correct
  3. Verify DTC P0010, P0013, P0016, P0017, P0335, P0336, P0340, P0341, P0365, P0366, P2088, P2089, P2090 or P2091 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If none of the DTCs are set
  4. Engine idling.
  5. Verify the scan tool parameters are less than 2° in each of the commanded states when commanding the Camshaft Position Actuator from 0-20° and back to 0° with the scan tool. Intake Camshaft Position Variance Exhaust Camshaft Position Variance Intake Camshaft Position Variance Exhaust Camshaft Position Variance If 2° or greater Refer to Circuit/System Testing. If less than 2°
  6. Verify that DTC P0011 or P0014 is not set. If any of the DTCs are set Refer to Circuit/System Testing. If none of the DTCs set
  7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  8. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  9. All OK.
  1. Ignition Off and all vehicle systems Off, disconnect the appropriate harness connector at the Q6 Camshaft Position Actuator Solenoid Valve. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the low reference circuit terminal B or 2 and ground. If 5 ohms or greater Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
  3. Ignition On, verify that a test lamp does not illuminate between the control circuit terminal A or 1 and ground. If the test lamp illuminates Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If the test lamp does not illuminate
  4. Remove the test lamp.
  5. Verify the scan tool parameters listed below do not display Malfunction when commanding the appropriate Camshaft Position Actuator Solenoid Valve On with a scan tool. Intake Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status Intake Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status If Malfunction is displayed Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance or short to ground in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If Malfunction is not displayed
  6. Ignition Off, remove the Q6 Camshaft Position Actuator Solenoid Valve.
  7. Verify the conditions listed below do not exist with the Q6 Camshaft Position Actuator Solenoid Valve: Torn, restricted, mis-positioned, or missing screens. Engine oil leak between the oil sealing lands of the solenoid. Inspect the lands of the solenoid for nicks. Oil seepage at the solenoid connector. If a condition is found Replace the Q6 Camshaft Position Actuator Solenoid Valve. If a condition is not found
  8. Ignition Off, swap the Q6 Camshaft Position Actuator Solenoid Valve with the Q6 Camshaft Position Actuator Solenoid Valve that is operating correctly.
  9. Engine idling.
  10. Verify the scan tool Camshaft Position Variance parameter is less than 2° in each of the commanded states when commanding the Camshaft Position Actuator from 0-20° and back to 0° with a scan tool. If 2° or greater Replace the mechanical camshaft position actuator. If less than 2°
  11. Test or replace the Q6 Camshaft Position Actuator Solenoid Valve.
  1. Ignition Off, disconnect the harness connector at the appropriate Q6 Camshaft Position Actuator Solenoid Valve.
  2. Test for 4.1-7.7 ohms between the control terminal A or 1 and the low reference circuit terminal B or 2 If not between 4.1-7.7 ohms Replace the Q6 Camshaft Position Actuator Solenoid Valve. If between 4.1-7.7 ohms
  3. Test for infinite resistance between each terminal and the Q6 Camshaft Position Actuator Solenoid Valve housing. If less than infinite resistance Replace the Q6 Camshaft Position Actuator Solenoid Valve. If infinite resistance
  4. All OK

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Camshaft Position Actuator Intake Solenoid Valve Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Camshaft Position Actuator Exhaust Solenoid Valve Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  3. «Camshaft Timing Chain, Sprocket, and Tensioner Cleaning and Inspection»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle__camshaft-timing-chain-sprocket-and-tensioner)
  4. «Camshaft Timing Chain and Tensioner Removal»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle__camshaft-timing-chain-and-tensioner-removal)
  5. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) uses the crankshaft position sensor, intake camshaft position sensor, and exhaust camshaft position sensor information to monitor the correlation between the crankshaft, intake camshaft, and exhaust camshaft position.

  1. DTC P0335, P0336, P0340, P0341, P0365, P0366, P0641, and P0651 are not set.
  2. The engine is cranking or running.
  3. The crankshaft and camshaft position signals are synchronized.
  4. The camshaft position actuator solenoid valves are in the parked position.

The DTCs run continuously once the above conditions are met.

The ECM detects a camshaft that is greater than 9 degrees advanced or 12 degrees retarded in relationship to the crankshaft.

DTCs P0016 and P0017 are Type B DTCs.

DTCs P0016 and P0017 are Type B DTCs.

  1. Inspect the engine for any recent engine mechanical repairs. An incorrectly installed timing chain can cause this DTC to set.
  2. A camshaft position actuator solenoid valve that is in the full advance or retard position can cause this DTC to set.

Description and Operation

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify DTC P0010, P0013, P0335, P0336, P0340, P0341, P0365, or P0366 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
  3. Engine Running at normal operating temperature.
  4. Verify DTC P0016 or P0017 is not set. If the DTC is set Inspect for the following and repair as necessary: A Q6 Camshaft Position Actuator Solenoid Valve that is stuck in the full advance or retard position. The correct installation of the Q6 Camshaft Position Actuator Solenoid Valves. The correct installation of the B23 Camshaft Position Sensors. The correct installation of the B26 Crankshaft Position Sensor. A timing chain tensioner condition. An incorrectly installed timing chain. Excessive play in the timing chain. A timing chain that jumped teeth. A crankshaft reluctor wheel that has moved in relationship to top dead center (TDC) on the crankshaft. If the DTC is not set
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets A mechanical condition listed above still exists. If the DTC does not set
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Camshaft Position Actuator Exhaust Solenoid Valve Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Camshaft Position Actuator Intake Solenoid Valve Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  3. «Camshaft Position Sensor Replacement - Exhaust»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  4. «Camshaft Position Sensor Replacement - Intake»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  5. «Crankshaft Position Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  6. «Timing Chain Tensioner Replacement»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-on-vehicle)
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
HO2S Heater Voltage SupplyP0030, P0031, P0036, P0037, P0097, P00F4, P0102, P0132, P0134, P0135, P0138, P0141, P0443, P0458, P0597, P06DA, P11C2, P16D2, P2199, P2648, *P0030, P0031, P0036, P0037, P0132, P0134, P0135, P0138, P0140, P0141, P0154, P0155, P0158, P0160, P0161P0690P0135, P0141
HO2S Heater ControlP0030, P0031, P0036, P0037, P0053, P0054, P0135, P0141P0030, P0036, P0053, P0132, P0134, P0135, P0138, P0140, P0141P0030, P0032, P0036, P0038, P0132, P0134, P0135, P0138, P0140, P0141, P0690P0135, P0141
* Opens Fuse

Typical Scan Tool Data

CircuitShort to GroundOpenShort to Voltage
Parameter Normal Range: 0.2-1.5 A
Voltage0 A0 A0.2-2 A
Control0 A0 A0 A

HO2S 1 Heater/HO2S 2 Heater

Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the engine control module (ECM). The ECM uses pulse width modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.

P0030-P0032 or P0036-P0038

  1. The ignition voltage is greater than 11 V.
  2. The engine speed is greater than 400 RPM.
  3. The DTCs run continuously when the above conditions are met.

P0053 or P0054

  1. DTCs P0112, P0113, P0117, P0118, or P2610 are not set.
  2. The ignition voltage is less than 32 V.
  3. The engine run time is less than 0.22 s.
  4. The ignition is OFF for greater than 8 h.
  5. The engine coolant temperature (ECT) is between -30 to +45°C (-22 to +113°F) at engine start-up.
  6. The ECT and the intake air temperature (IAT) are within 8°C (14°F) at engine start-up.
  7. The DTCs run once per drive cycle when the above conditions are met.

P0135 or P0141

  1. DTCs P0116, P0117, P0118, P0125, or P0128 are not set.
  2. The ignition voltage is between 10-32 V.
  3. The HO2S is at operating temperature.
  4. The DTCs run twice per drive cycle with a 30 s delay between tests and a 1 s execution rate when the above conditions are met for 120 s.

P0030 or P0036

The engine control module detects an open in the heater circuits of the HO2S when the heater is commanded OFF for greater than 6 s.

P0031 or P0037

The engine control module detects a short to ground in the heater output low side driver circuit of the heated oxygen sensor when the heater is commanded OFF for greater than 6 s.

P0032 or P0038

The engine control module detects a short to voltage in the heater output low side driver circuit of the heated oxygen sensor when the heater is commanded ON for greater than 6 s.

P0053 or P0054

The ECM detects the HO2S heater is not within a specified resistance range at engine start-up.

P0135 or P0141

The ECM detects that the HO2S heater current is greater than 2.5 A or less than 0.3 A for greater than 10 s.

DTCs P0030-P0032, P0036-P0038, P0053, P0054, P0135, and P0141 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0030-P0032, P0036-P0038, P0053, P0054, P0135, and P0141 are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Engine running.
  2. Verify the parameters listed below do not display Malfunction: HO2S 1 or 2 Heater Control Circuit Low Voltage Test Status HO2S 1 or 2 Heater Control Circuit Open Test Status HO2S 1 or 2 Heater Control Circuit High Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing If Malfunction is not displayed
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing If the DTC does not fail
  5. All OK.
  1. Ignition OFF, disconnect the harness connector at the appropriate B52 Heated Oxygen Sensor. Ignition ON.
  2. Verify that a test lamp illuminates between the ignition voltage circuit terminal 2 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test all components connected to the fuse and replace as necessary. If the test lamp illuminates
  3. Verify that a test lamp does not illuminate between the ignition voltage circuit terminal 2 and the control circuit terminal 1. If the test lamp illuminates Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If the test lamp does not illuminate
  4. Remove the test lamp.
  5. Verify the scan tool HO2S 1 or 2 Heater Control Circuit High Voltage Test Status parameter is OK when commanding the HO2S Heater Sensor 1 or 2 ON with a scan tool. If OK is not displayed Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If OK is displayed
  6. Install a 10 A fused jumper wire between the control circuit terminal 1 and the ignition voltage circuit terminal 2.
  7. Verify the scan tool HO2S 1 or 2 Heater Control Circuit High Voltage Test Status parameter is Malfunction when commanding the HO2S Heater Sensor 1 or 2 ON with a scan tool. If Malfunction is not displayed Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If Malfunction is displayed
  8. Test or replace the B52 Heated Oxygen Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Heated Oxygen Sensor Replacement - Sensor 1 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Heated Oxygen Sensor Replacement - Sensor 1 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Heated Oxygen Sensor Replacement - Sensor 2 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Heated Oxygen Sensor Replacement - Sensor 2 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  3. Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing an Heated Oxygen Sensor.
  4. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Ignition Voltage CircuitP0033, P0034, P0243, P0245, P0443, P06DA, P06DB*P0033P0033
Turbocharger Bypass Valve Solenoid Control CircuitP0034P0033P0033P0035, P0690P0033
* Ignition fuse opens. A message center or an indicator displays ENGINE POWER IS REDUCED. Engine experiences NO Crank - NO Start condition.

The dual-scroll turbocharger incorporates a wastegate that is controlled by the engine control module (ECM) by means of a pulse width modulation (PWM) solenoid, to regulate the pressure ratio of the compressor. An ECM controlled compressor bypass valve is integrated into the unit to prevent compressor surging and damage from vibrations by opening during abrupt closed throttle conditions. The bypass valve is open during closed throttle deceleration conditions to allow air to recirculate in the turbocharger and maintain compressor speed.

As engine load and RPM increase, the turbocharger bypass valve is commanded closed by the ECM. As soon as the throttle closes, the valve is commanded open to allow the turbocharger air to recirculate to prevent compressor surging.

Conditions for Running the DTCs

  1. Ignition is On or the engine is running.
  2. Battery voltage is between 11-32 V.
  3. The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTCs

The ECM detects an open, a short to ground, or a short to voltage on the turbocharger bypass solenoid valve control circuit for greater than 10 s.

Action Taken When the DTCs Set

DTCs P0033, P0034, and P0035 are Type B DTCs.

Conditions for Clearing the MIL/DTCs

DTCs P0033, P0034, and P0035 are Type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information.

  1. Ignition On
  2. Verify a click is heard or felt from the Q40 Turbocharger Bypass Solenoid Valve when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool. If a click is not heard or felt Refer to Circuit/System Testing If a click is heard or felt
  3. Verify the circuit status parameters listed below do not display Malfunction when commanding the Turbocharger Bypass Solenoid Valve between Inactive and Active with a scan tool: Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status Turbocharger Bypass Solenoid Valve Control Circuit Open Test Status Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing If Malfunction is not displayed
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  5. Verify a DTC does not set. If a DTC sets Refer to Circuit/System Testing If a DTC does not set
  6. All OK
  1. Ignition Off, disconnect the harness connector at the Q40 Turbocharger Bypass Solenoid Valve, ignition On.
  2. Verify a test lamp illuminates between the ignition circuit terminal 1 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition Off. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition Off, remove the test lamp. NOTE: An short circuit in any component supplied by the fuse may cause the fuse to open and set a DTC when the component is activated. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test all components supplied by the fuse and replace as necessary. If the test lamp illuminates
  3. Verify that a test lamp does not illuminate between the control circuit terminal 2 and the ignition circuit terminal 1. If the test lamp illuminates Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If the test lamp does not illuminate
  4. Remove the test lamp.
  5. Verify the scan tool Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status parameter is OK when commanding the Turbocharger Bypass Solenoid Valve Active with a scan tool. If OK is not displayed Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If OK is displayed
  6. Install a 3 A fused jumper wire between the control circuit terminal 2 and the ignition circuit terminal 1.
  7. Verify the scan tool Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status parameter is Malfunction when commanding the Turbocharger Bypass Solenoid Valve Active with a scan tool. If Malfunction is not displayed Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If Malfunction is displayed
  8. Test or replace the Q40 Turbocharger Bypass Solenoid Valve.

Static Test

  1. Ignition Off, disconnect the harness connector at the Q40 Turbocharger Bypass Solenoid Valve.
  2. Test for 10-14 ohms between the control terminal 2 and the Ignition terminal 1 of the Q40 Turbocharger Bypass Solenoid Valve. If not between 10-14 ohms Replace the Q40 Turbocharger Bypass Solenoid Valve. If between 10-14 ohms
  3. All OK

Dynamic Test

  1. Install a 10 A fused jumper wire between the ignition terminal 2 of the Q40 Turbocharger Bypass Solenoid Valve and 12 V. Install a jumper wire between the control terminal 1 and ground.
  2. Verify the Q40 Turbocharger Bypass Solenoid Valve plunger retracts. If the plunger does not retract. Replace the Q40 Turbocharger Bypass Solenoid Valve. If the plunger retracts.
  3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Turbocharger Bypass Valve Solenoid Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) compares actual airflow based on throttle position (TP) to a calculated airflow based on manifold absolute pressure (MAP) sensor, and mass air flow (MAF) and when equipped: Turbocharger Boost Pressure sensor.

DTC P0068

  1. DTC P0102, P0103, P0107, P0108, or P0651 is not set
  2. The engine speed is at least 800 RPM.
  3. The Ignition signal is at least 6.0 V.
  4. The DTC runs continuously when the above conditions are met.

DTC P1101

  1. DTC P0102, P0103, P0107, P0108, P0117, P0118, P0128, P0335, or P0336 is not set
  2. The engine speed is between 400-6,000 RPM
  3. The engine coolant temperature (ECT) is between -7 to +125°C (+19 to +257°F).
  4. The intake air temperature (IAT) is between -20 to +125°C (-4 to +257°F).
  5. The DTC runs continuously when the above conditions are met.

The ECM detects that the actual airflow rate is greater than the calculated airflow.

  1. DTC P0068 is a Type A DTC.
  2. DTC P1101 is a Type B DTC.

Conditions for Clearing the DTCs

  1. DTC P0068 is a Type A DTC.
  2. DTC P1101 is a Type B DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify that DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM, LCV without turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P0641, P0651, P0697, or P06A3 (ECM, LTG with turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
  3. Verify the scan tool Throttle Body Idle Air Flow Compensation parameter is less than 90 %. If 90 % or greater Refer to «Throttle Body Cleaning»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions__throttle-body-cleaning) . If less than 90 %
  4. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Disagree Refer to «DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) , «DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If Agree
  5. Determine the current vehicle testing altitude.
  6. Verify the scan tool MAP Sensor pressure parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table. If the MAP Sensor parameter is not in range Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If the MAP Sensor parameter is in range
  7. Verify the engine is equipped with a turbocharger. If not equipped with a turbocharger. Refer to Step 10. If equipped with a turbocharger.
  8. Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table. If the Boost Pressure Sensor parameter is not in range Refer to «DTC P0236»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If the Boost Pressure Sensor parameter is within range
  9. Verify the scan tool Boost Pressure Sensor parameter decreases after starting the engine. If the Boost Pressure Sensor parameter does not decrease Refer to «DTC P0236»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If the Boost Pressure Sensor parameter is within range
  10. Engine idling, verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 psi) and changes with accelerator pedal input. If not between 26-52 kPa (3.8-7.5 psi) or does not change Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If between 26-52 kPa (3.8-7.5 psi) and changes
  11. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3,000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. The MAF Sensor parameter does not change smoothly and gradually Refer to «DTC P0101»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. The MAF Sensor parameter changes smoothly and gradually
  12. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  13. Verify a DTC does not set. If any DTC sets Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If no DTCs set
  14. All OK

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for engine control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The fuel rail pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on the 5 V reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit.

High pressure fuel is regulated by the high pressure fuel pump actuator, which is a part of the high pressure fuel pump. The high pressure fuel pump actuator is a solenoid valve. The ECM provides a voltage on the actuator high control circuit and ground on the actuator low control circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control circuit driver energizes the high pressure fuel pump actuator and the low control circuit driver pulse-width modulates (PWM) the low control circuit to ground.

The high pressure mechanical fuel pump is driven by three lobes on the camshaft. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the high pressure fuel pump actuator with the position of each of the camshaft lobes. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail.

The ECM monitors the fuel rail fuel pressure sensor and the high pressure fuel pump actuator to determine if the commanded and actual pressure are within a predetermined range, or if the amount of fuel pressure correction exceeds a calibrated pressure.

P0089, P228C, or P228D

  1. DTC P0016, P0017, P0090, P0091, P0092, P00C8, P00C9, P00CA, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0128, P0191, P0192, P0193, P0335, P0336, P0340, P0341, P0365, P0366, P0628, or P1682 is not set.
  2. The ignition voltage is greater than 11 V.
  3. The engine is running.
  4. The low side fuel pressure is greater than 250 kPa (36 psi).
  5. The barometric (BARO) pressure is greater than 70 kPa.
  6. The intake air temperature (IAT) is warmer than -20°C (-4°F).
  7. The DTC runs continuously when the above conditions are met for 60 s.

P00C6

  1. DTC P0016, P0017, P0090, P0091, P0092, P00C8, P00C9, P00CA, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0128, P0191, P0192, P0193, P0335, P0336, P0340, P0341, P0365, P0366, P0628, or P1682 is not set.
  2. The ignition voltage is greater than 8 V.
  3. The engine coolant temperature is between -100 and +80°C (-148 and +176°F).
  4. The low side fuel pressure is greater than 0 kPa (0 psi).
  5. The engine is not running.
  6. The DTC runs once for each engine start.

P0089

The high pressure fuel pump actuator command is greater than or equal to 100 ° or less than or equal to 0 °. The condition exists for greater than 5 s.

P00C6

The ECM detects that the fuel pressure is not rising or has fallen beyond acceptable limits during engine cranking.

P228C

The actual fuel rail pressure is 3 MPa (435 psi) less than the desired fuel pressure. The condition exists for greater than 5 s.

P228D

The actual fuel rail pressure is 3 MPa (435 psi) greater than the desired fuel rail pressure. The condition exists for greater than 5 s.

  1. DTCs P0089 and P00C6 are Type B DTCs.
  2. DTCs P228C and P228D are Type A DTCs.
  3. A message center or an indicator displays Reduced Engine Power.
  4. Scan tool control of the high pressure fuel pump is inhibited.
  1. DTCs P0089 and P00C6 are Type B DTCs.
  2. DTCs P228C and P228D are Type A DTCs.
  1. Any problem with the camshaft may set fuel pressure DTCs due to the location and design of the high pressure fuel pump. If camshaft position control DTCs are current or in history, a cam control issue may be the root cause.
  2. A faulty valve, plunger, or solenoid in the high pressure fuel pump may set a DTC. High pressure fuel pump damage will most likely be undetectable upon visual inspection.
  3. A restricted fuel feed pipe between the fuel feed pipe fuel pressure sensor and the high pressure fuel pump may set a DTC.
  4. A leaking or restricted fuel injector may set a DTC.
  5. A leak in the high pressure fuel system may set a DTC.
  6. Vapor lock may set DTC P0089

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify DTC P0010, P0011, P0016, P0090, P0091, P0092, P00C8, P00C9, P00CA, P018B, P018C, P018D, P0191, P0192, P0193, P0231, P0232, P023F, P0335, P0336, P0340, P0341, P0627, P0628, P0629, P069E, P163A, P2088, P2089, or U0109 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If none of the DTCs are set
  3. Engine idling.
  4. Verify DTC P0089, P00C6, P228C, or P228D is not set. If any of the DTCs are set Refer to Circuit/System Testing. If none of the DTCs are set
  5. Verify the scan tool Fuel Rail Pressure Sensor parameter is approximately 2.96-3.24 Mpa (429-470 psi). If not between 2.96-3.24 Mpa (429-470 psi) Refer to Circuit/System Testing. If between 2.96-3.24 Mpa (429-470 psi)
  6. Command an increase and decrease in Fuel Rail Pressure with a scan tool. Verify the scan tool Fuel Rail Pressure Sensor parameter increases or decreases with each commanded state. Does not change Refer to Circuit/System Testing. Changes
  7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  8. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  9. All OK.
  1. Ignition ON.
  2. Command an increase in Fuel Pump Control Module Fuel Pressure with a scan tool. Verify the scan tool Fuel Pump Control Module Fuel Pressure Sensor parameter increases to greater than 414 kPa (60 psi) as commanded. Does not increase Refer to «Fuel System Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. Increases
  3. Remove the G18 High Pressure Fuel Pump.
  4. Inspect the lobes on the camshaft for unusual wear. Lobes are worn Replace the camshaft. Lobes are normal Replace the G18 High Pressure Fuel Pump.

Static Test

  1. Ignition OFF, disconnect the harness connector at the G18 High Pressure Fuel Pump.
  2. Test for 0.3-0.7 ohms at 20°C (68°F) between the high control circuit terminal 1 and the low control circuit terminal 2. If not between 0.3-0.7 ohms Replace the G18 High Pressure Fuel Pump. If between 0.3-0.7 ohms
  3. Test for infinite resistance between each terminal and the G18 High Pressure Fuel Pump housing. If less than infinite resistance Replace the G18 High Pressure Fuel Pump. If infinite resistance
  4. All OK

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Camshaft Position Actuator and Camshaft Replacement - Intake»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-on-vehicle__camshaft-position-actuator-and-camshaft-replacement)
  2. «Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  3. «Fuel Pump Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  4. Perform the Fuel Rail Pressure Relief Valve Reset procedure, if supported on the scan tool.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
High Pressure Fuel Pump Actuator High ControlP0091, P0092, P00C9P0090, P00C8P0092, P00CA
High Pressure Fuel Pump Actuator Low ControlP0091, P00C9P0090, P00C8P0092, P00C9, P00CA

High pressure fuel is regulated by the high pressure fuel pump actuator, which is a part of the high pressure fuel pump. The high pressure fuel pump actuator is a solenoid valve. The engine control module (ECM) provides battery voltage on the actuator high control circuit and ground on the actuator low control circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control circuit driver energizes the high pressure fuel pump actuator and the low control circuit driver pulse-width modulates (PWM) the low control circuit to ground. The ECM monitors the voltage on the circuits to detect a failure.

  1. The ignition voltage is greater than 11 V.
  2. The engine speed is greater than 50 RPM.
  3. The DTCs run continuously within the enabling conditions.

P0090

  1. The ECM detects an open circuit in the high pressure fuel pump actuator low control circuit.
  2. The DTC sets when the above condition is present for 4 s.

P0091

  1. The ECM detects a short to ground in the high pressure fuel pump actuator low control circuit.
  2. The DTC sets when the above condition is present for 4 s.

P0092

  1. The ECM detects a short to voltage in the high pressure fuel pump actuator low control circuit.
  2. The DTC sets when the above condition is present for 4 s.

P00C8

  1. The ECM detects an open circuit in the high pressure fuel pump actuator high control circuit.
  2. The DTC sets when the above condition is present for 4 s.

P00C9

  1. The ECM detects a short to ground in the high pressure fuel pump actuator high control circuit.
  2. The DTC sets when the above condition is present for 4 s.

P00CA

  1. The ECM detects a short to voltage in the high pressure fuel pump actuator high control circuit.
  2. The DTC sets when the above condition is present for 4 s.
  1. DTCs P0090, P0091, P0092, P00C8, P00C9, and P00CA are Type A DTCs.
  2. A message center or an indicator displays Reduced Engine Power.

DTCs P0090, P0091, P0092, P00C8, P00C9, and P00CA are Type A DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify DTC P0685 or P1682 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If none of the DTCs are set
  3. Command the Fuel Pressure Regulator ON and OFF with a scan tool while observing the following control circuit status parameters: Fuel Pressure Regulator Control Circuit High Voltage Test Status Fuel Pressure Regulator Control Circuit Open Test Status Fuel Pressure Regulator Control Circuit Low Voltage Test Status Fuel Pressure Regulator High Control Circuit High Voltage Test Status Fuel Pressure Regulator High Control Circuit Open Test Status Fuel Pressure Regulator High Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If OK or Not Run is displayed
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  5. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing If the DTC does not set
  6. All OK
  1. Ignition OFF, disconnect the harness connector at the G18 High Pressure Fuel Pump.
  2. Ignition ON, verify that a test lamp does not illuminate between the high control circuit terminal 1 and ground and the low control circuit terminal 2 and ground. If the test lamp illuminates Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the appropriate control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If the test lamp does not illuminate
  3. Verify that a test lamp does not illuminate between the high control circuit terminal 1 and B+ and the low control circuit terminal 2 and B+. If the test lamp illuminates Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the appropriate control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If the test lamp does not illuminate
  4. Connect a 3 A fused jumper wire between the high control circuit terminal 1 and ground.
  5. Verify the Fuel Pressure Regulator High Control Circuit Open Test Status transitions from Malfunction to OK and the Fuel Pressure Regulator High Control Circuit Low Voltage Test Status transitions from OK to Malfunction. The parameters do not change Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the high control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. The parameters change
  6. Connect a 3 A fused jumper wire between the low control circuit terminal 2 and B+.
  7. Verify the Fuel Pressure Regulator Control Circuit Open Test Status transitions from Malfunction to OK and the Fuel Pressure Regulator Control Circuit High Voltage Test Status transitions from OK to Malfunction. The parameters do not change Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. The parameters change
  8. Test or replace the G18 High Pressure Fuel Pump.

Static Test

  1. Ignition OFF, disconnect the harness connector at the G18 High Pressure Fuel Pump.
  2. Test for 0.3-0.7 ohms at 20°C (68°F) between the high control circuit terminal 1 and the low control circuit terminal 2. If not between 0.3-0.7 ohms Replace the G18 High Pressure Fuel Pump. If between 0.3-0.7 ohms
  3. Test for infinite resistance between each terminal and the G18 High Pressure Fuel Pump housing. If less than infinite resistance Replace the G18 High Pressure Fuel Pump. If infinite resistance
  4. All OK

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Fuel Pump Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K20 Engine Control Module replacement, setup, and programming
  3. Perform the Fuel Rail Pressure Relief Valve Reset procedure, if supported on the scan tool.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalP0112, P0114, P2199P0111, P0113, P0114, P2199P0097*, P0113, P0114, P11C2, P2199P0111, P2199
Low ReferenceP0111, P0113, P0114, P2199P0113*, P0114
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 1

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ignition VoltageP0096, P0097, P0102, P11C2, P2199P0096, P0097, P0102, P11C2, P2199P0096
SignalP0096, P0097, P11C3, P2199P0096, P0097, P11C2, P2199P0096*, P0097, P11C2, P2199P0096
GroundP0096, P0097, P0102, P11C2, P2199P0096
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 2

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
Signal150°C (302°F)40°C (-40°F)40°C (-40°F)*
Low Reference40°C (-40°F)40°C (-40°F)*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 1

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
Ignition Voltage40°C (-40°F) 10 Hz40°C (-40°F) 10 Hz
Signal40°C (-40°F) 10 Hz40°C (-40°F) 10 Hz40°C (-40°F)* 10 Hz
Ground40°C (-40°F) 10 Hz
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 2

The intake air temperature (IAT) sensor 1 is a variable resistor that measures the temperature of the air in the sensor bore. The engine control module (ECM) supplies 5 V to the IAT sensor 1 signal circuit and a ground for the IAT sensor 1 low reference circuit. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F).

The IAT sensor 2 produces a frequency signal based on the inlet air temperature very close to the humidity sensor within the sensor bore. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F) and Hertz (Hz). The ECM applies 5 V to the circuit. The signal circuit is shared by the IAT sensor 2 and the humidity sensor. Ignition voltage and ground circuits are also supplied to the multifunction intake air sensor's internal circuits for these sensors

  1. IAT sensor 2
  2. Humidity sensor
  3. MAF sensor

The multifunction intake air sensor houses the following

  1. IAT sensor 1
  2. IAT sensor 2
  3. Humidity sensor
  4. MAF sensor
  5. BARO pressure sensor
IAT Sensor 1IAT Sensor 1 ResistanceIAT Sensor 1 Signal Voltage
ColdHighHigh
WarmLowLow

IAT Sensor 1 - Temperature, Resistance, Voltage Table

IAT Sensor 2IAT Sensor 2 FrequencyIAT Sensor 2 Temperature
Cold45 Hz40°C (-40°F)
Warm302 Hz104°C (219°F)

IAT Sensor 2 - Temperature, Frequency Table

P0096 and P0111

  1. DTCs P0097, P0098, P0112, P0113, P0117, P0118, P0119, or P1682 are not set.
  2. The vehicle has been OFF at least 8 hours.
  3. The Ignition signal is at least 11 V for longer than 0.9 s.
  4. These DTCs run once per ignition cycle when the enabling conditions are met.

P0096

  1. The ECM determines the absolute difference between IAT sensor 1 start-up temperature and the IAT sensor 2 start-up temperature is greater than 30°C (54°F). AND
  2. The absolute difference between ECT start-up temperature and the IAT sensor 2 start-up temperature is greater or equal to the absolute difference between ECT start-up temperature and the IAT sensor 1 start-up temperature.
  3. This DTC runs once per ignition cycle when the enabling conditions are met.

P0111

  1. The ECM determines the absolute difference between IAT sensor 1 start-up temperature and the IAT sensor 2 start-up temperature is greater than 30°C (54°F). AND
  2. The absolute difference between ECT start-up temperature and the IAT sensor 1 start-up temperature is greater or equal to the absolute difference between ECT start-up temperature and the IAT 2 start-up temperature.
  3. This DTC runs once per ignition cycle when the enabling conditions are met.

DTCs P0096 and P0111 are Type B DTCs.

DTCs P0096 and P0111 are Type B DTCs.

The humidity sensor and the IAT sensor 2 signals are sent to the ECM on the same circuit. If the IAT Sensor 2 parameter displays the values: 10 Hz; -40°C (-40°F), and there are also Humidity Sensor DTCs, check for a circuit problem.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-38522 Variable Signal Generator

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

Note. To minimize the effects of residual engine heat and sensor internal heating elements, perform Steps 1 and 2 of this verification procedure only if the ignition has been OFF for 8 hours or more.

  1. Ignition ON.
  2. Verify the following scan tool parameters are within 30°C (54°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 IAT Sensor 3, where equipped If not within 30°C (54°F) Refer to Circuit/System Testing. If within 30°C (54°F)
  3. Engine idling, verify the following scan tool parameters are between: -38 and +149°C (-36 and +300°F). IAT Sensor 1 IAT Sensor 2 IAT Sensor 3, where equipped If not between: -38 and +149°C (-36 and +300°F) Refer to Circuit/System Testing. If between: -38 and +149°C (-36 and +300°F)
  4. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
  5. Verify the DTCs do not set. If any of the DTCs set Refer to Circuit/System Testing. If none of the DTCs set
  6. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Verify the integrity of the entire air induction system by verifying that none of the following conditions exist: A loose or disconnected charge air cooler hose or pipe; where equipped A blocked or obstructed charge air cooler, including: after-market grill covers; where equipped Any snow or ice build-up at the charge air cooler in cold climates; where equipped Any mud or dirt build-up at the charge air cooler; where equipped A restricted or collapsed air intake duct An intake manifold leak Improper operation of the positive crankcase ventilation system A MAP sensor seal that is leaking, missing, or damaged A restricted or collapsed air intake duct A misaligned or damaged air intake duct Any water intrusion in the induction system An Intake Manifold Resonator with a leaking seal, or a cracked or broken housing If a condition exists Repair or replace component as appropriate. If no condition exists
  2. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
  3. Ignition OFF and all systems OFF. It may take up to for 2 minutes for all vehicle systems to power down. Test for less than 2 ohms between the low reference circuit terminal 3 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
  4. Ignition OFF, all vehicle systems OFF, test for less than 2 ohms between the ground circuit terminal 7 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 2 ohms
  5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit. Test for less than 2 ohms in the ignition voltage circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit. Test for infinite resistance between the ignition voltage circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for greater than 2 ohms between the ignition voltage circuit terminal 5 and ground. If less than 2 ohms, repair the short to ground on the circuit. If greater than 2 ohms, test all the components connected to the circuit and repair or replace as necessary. If a test lamp illuminates
  6. Ignition ON, test for 4.8-5.2 V between the intake air temperature signal 1 circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  7. Ignition ON, test for 4.8-5.2 V between the intake air temperature signal 2 circuit terminal 8 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  8. Ignition OFF, connect the leads of the EL-38522 Variable Signal Generator as follows: Red lead to the signal circuit terminal 8 at the harness connector Black leads to ground Battery voltage supply lead to B+
  9. Set the EL-38522 Variable Signal Generator to the following specifications. Signal switch to 5 V Duty Cycle switch to 50 % (Normal) Frequency switch to 30 Hz
  10. Ignition ON, verify the scan tool IAT Sensor 2 parameter is between 28-32 Hz. If not between 28-32 Hz Replace the K20 Engine Control Module. If between 28-32 Hz
  11. Verify the engine is equipped with a turbocharger. If not equipped with a turbocharger. Refer to Step 15 If equipped with a turbocharger.
  12. Ignition OFF, disconnect the harness connector at the B111B Turbocharger Boost/Intake Air Temperature sensor.
  13. Ignition OFF and all systems OFF. It may take up to for 2 minutes for all vehicle systems to power down. Test for less than 2 ohms between the low reference circuit terminal 1 and ground. If 2 ohms or greater Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
  14. Ignition ON, test for 4.8-5.2 V between the intake air temperature sensor 3 signal circuit terminal 2 and ground. If less than 4.8 V Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  15. Test or replace the appropriate temperature sensor.

Multifunction Intake Air Sensor

  1. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
  2. Test the IAT sensor 1 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Intake Air Temperature Sensor (Hitachi Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) , «Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) table for Hitachi Sensors. The resistance values should be in range of the table values. If not within the specified range Replace the B75C Multifunction Intake Air sensor If within the specified range
  3. All OK.

Multifunction Intake Air Sensor

  1. Test the IAT Sensor 2 by varying the sensor temperature while monitoring the air temperature with a thermometer. Compare the readings with the scan tool IAT Sensor 2 parameter. The values should be within 5%. If not within the specified range Replace the B75C Multifunction Intake Air sensor If within the specified range
  2. All OK.

Turbocharger Boost/Intake Air Temperature Sensor; if equipped

  1. Ignition OFF, disconnect the harness connector at the B111B Turbocharger Boost/Intake Air Temperature sensor.
  2. Test the IAT sensor 3 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Intake Air Temperature Sensor (Hitachi Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) , «Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) table for Delco Sensors. The resistance values should be in range of the table values. If not within the specified range Replace the B111B Turbocharger Boost/Intake Air Temperature sensor If within the specified range
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Intake Air Pressure and Temperature Sensor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for turbocharger boost/intake air temperature sensor replacement
  2. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for multifunction intake air sensor replacement
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ignition VoltageP0096, P0097, P0102, P11C2, P2199P0096, P0097, P0102, P11C2, P2199P0096
SignalP0096, P0097, P11C3, P2199P0096, P0097, P11C2, P2199P0096*, P0097, P11C2, P2199P0096
GroundP0096, P0097, P0102, P11C2, P2199P0096
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 2

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
Ignition Voltage40°C (-40°F) 10 Hz40°C (-40°F) 10 Hz
Signal40°C (-40°F) 10 Hz40°C (-40°F) 10 Hz40°C (-40°F)* 10 Hz
Ground40°C (-40°F) 10 Hz
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 2

The intake air temperature (IAT) sensor 1 is a variable resistor that measures the temperature of the air in the sensor bore. The engine control module (ECM) supplies 5 V to the IAT sensor 1 signal circuit and a ground for the IAT sensor 1 low reference circuit. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F).

The IAT sensor 2 produces a frequency signal based on the inlet air temperature very close to the humidity sensor within the sensor bore. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F) and Hertz (Hz). The ECM applies 5 V to the circuit. The signal circuit is shared by the IAT sensor 2 and the humidity sensor. Ignition voltage and ground circuits are also supplied to the multifunction intake air sensor's internal circuits for these sensors

  1. IAT sensor 2
  2. Humidity sensor
  3. Mass Air Flow (MAF) sensor

The multifunction intake air sensor houses the following

  1. IAT sensor 1
  2. IAT sensor 2
  3. Humidity sensor
  4. MAF sensor
  5. BARO pressure sensor
IAT Sensor 2IAT Sensor 2 FrequencyIAT Sensor 2 Temperature
Cold45 Hz40°C (-40°F)
Warm302 Hz104°C (219°F)

IAT Sensor 2 - Temperature, Frequency Table

P0097, P0098, and P0099

  1. The ignition is ON, or the engine is running.
  2. The Ignition signal is at least 11 V for longer than 0.9 s.
  3. The DTCs run continuously within the enabling conditions.

P0097

Note. The scan tool display range is between -40 and +150°C (-40 and +302°F).

The ECM detects that the sensor signal is less than 13 Hz, colder than -60°C (-76°F), for greater than 5 s.

P0098

The ECM detects that the sensor signal is greater than 390 Hz, warmer than 150°C (302°F), for greater than 5 s.

P0099

The ECM monitors the sensor signal every 0.1 s, to determine if the signal has changed more than 125°C (257°F) during a 4 s time period.

  1. DTCs P0097, P0098, and P0099 are Type B DTCs.
  2. The ECM commands the cooling fans ON.

DTCs P0097, P0098, and P0099 are Type B DTCs.

  1. With the ignition ON, the engine OFF, if the engine is cold, a properly functioning IAT sensor 2 will gradually increase the scan tool IAT Sensor 2 parameter. This is due to the heat that is generated by the MAF sensor heating elements.
  2. The humidity sensor and the IAT sensor 2 signals are sent to the ECM on the same circuit. If the IAT Sensor 2 parameter displays the values: 10 Hz; -40°C (-40°F), and there are also Humidity Sensor DTCs, check for a circuit problem.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-38522 Variable Signal Generator

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

Note. To minimize the effects of residual engine heat and sensor internal heating elements, perform Steps 1 and 2 of this verification procedure only if the ignition has been OFF for 8 hours or more.

  1. Engine idling, verify the following scan tool parameters are between: between -38 and +149°C (-36 and +300°F). IAT Sensor 1 IAT Sensor 2 If not between: -38 and +149°C (-36 and +300°F) Refer to Circuit System Testing. If between: -38 and +149°C (-36 and +300°F)
  2. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
  3. Verify the DTCs do not set. If any of the DTCs set Refer to Circuit/System Testing. If none of the DTCs set
  4. All OK
  1. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
  2. Ignition OFF, all systems OFF. It may take up to for 2 minutes for all vehicle systems to power down. Test for less than 2 ohms between the low reference circuit terminal 3 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
  3. Ignition OFF, all vehicle systems OFF, test for less than 2 ohms between the ground circuit terminal 7 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 2 ohms
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit. Test for less than 2 ohms in the ignition voltage circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit. Test for infinite resistance between the ignition voltage circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for greater than 2 ohms between the ignition voltage circuit terminal 5 and ground. If less than 2 ohms, repair the short to ground on the circuit. If greater than 2 ohms, test all the components connected to the circuit and repair or replace as necessary. If a test lamp illuminates
  5. Ignition ON, test for 4.8-5.2 V between the intake air temperature sensor 2 signal circuit terminal 8 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  6. Ignition OFF, connect the leads of the EL-38522 Variable Signal Generator as follows: Red lead to the signal circuit terminal 8 at the harness connector Black leads to ground Battery voltage supply lead to B+
  7. Set the EL-38522 Variable Signal Generator to the following specifications. Signal switch to 5 V Duty Cycle switch to 50 % (Normal) Frequency switch to 30 Hz
  8. Ignition ON, observe the scan tool IAT Sensor 2 parameter. The scan tool parameter should be between 28-32 Hz. If not between 28-32 Hz Replace the K20 Engine Control Module. If between 28-32 Hz
  9. Test or replace the B75C Multifunction Intake Air sensor.

Multifunction Intake Air Sensor

  1. Test the IAT Sensor 2 by varying the sensor temperature while monitoring the air temperature with a thermometer. Compare the readings with the scan tool IAT Sensor 2 parameter. The values should be within 5%. If not within the specified range Replace the B75C Multifunction Intake Air sensor If within the specified range
  2. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for multifunction intake air sensor replacement.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Intake Air Pressure Measurement System consists of 3 sensors, the barometric pressure (BARO) sensor, the manifold absolute pressure (MAP) sensor, and the turbocharger boost sensor.

  1. DTCs P0106, P0107, P0108, P0237, P0238, P2227, P2228, P2229, or P2230 are not set.
  2. The engine is not running.
  3. Time between current ignition cycle and the last time the engine was running is greater than 10 s.
  4. Manifold pressure between 50-115 kPa (7.25-16.68 PSI).
  5. BARO pressure between 50-115 kPa (7.25-16.68 PSI).
  6. Turbocharger boost pressure between 50-115 kPa (7.25-16.68 PSI).
  7. This DTC runs continuously within the enabling conditions.

The ECM detects an inconsistency between pressure sensors in the induction system in which a particular sensor cannot be identified as the failed sensor. The difference is greater than 10 kPa (1.5 PSI).

DTC P00C7 is a Type B DTC.

DTC P00C7 is a Type B DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify that DTCs P0106, P0107, P0108, P2122, P2123, P2127, P2128, P2138 or P2610 are not set. If a DTC is set If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If no DTC is set
  3. Ignition ON.
  4. Verify the following scan tool parameters are within range of the Altitude vs. Barometric Pressure table. Refer to: «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table. BARO Sensor MAP Sensor Turbo Boost Sensor If a sensor parameter is not within range Refer to the appropriate diagnostic below for further diagnosis. Barometric Pressure (BARO) Sensor. Refer to «DTC P2227-P2230 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Manifold Absolute Pressure (MAP) Sensor. Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . Turbocharger Boost Pressure Sensor. Refer to «DTC P0236»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If all sensor parameters are within range
  5. All OK

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalP00EA, P00EBP00E9, P00EB, P00ECP00EB, P00EC*P00E9
Low ReferenceP00E9, P00EB, P00ECP00EB, P00EC*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 3

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalP0112, P0114, P2199P0113, P0114, P2199P0113, P0114, P2199*P0111, P0114
Low ReferenceP0097, P0113, P11C2, P2227, P2229*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 1

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP0097, P0557, P0651, P086D, P11C2, P2199, P2227, P2228P0096, P0097, P11C2, P2199, P2227, P2228P0097, P0558, P0651, P086D, P11C2, P2199, P2227, P2228
SignalP0097, P11C3, P2199P0097, P11C2, P2199P0097, P11C2, P2199*
Low ReferenceP0097, P0113, P11C2, P2227, P2229*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 2

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature; and engine bay conditions
Signal150°C (302°F)40°C (-40°F)40°C (-40°F)*
Low Reference40°C (-40°F)40°C (-40°F)*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 3

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature; and engine bay conditions
Signal150°C (302°F)40°C (-40°F)40°C (-40°F)*
Low Reference40°C (-40°F)40°C (-40°F)*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 1

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
5 V Reference40°C (-40°F)40°C (-40°F)
Signal40°C (-40°F)40°C (-40°F)40°C (-40°F)*
Low Reference40°C (-40°F)*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 2

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
5 V Reference10 Hz10 Hz
Signal10 Hz10 Hz10 Hz*
Low Reference10 Hz*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 2

The intake air temperature (IAT) sensor 3 is a variable resistor that changes an engine control module (ECM) supplied 5 V signal. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F). The IAT sensor 3 is integrated with the throttle inlet absolute pressure sensor in the sensor bore, which is located before the throttle body. The ECM a ground for the IAT sensor 3 low reference circuit.

IAT Sensor 3IAT Sensor 3 ResistanceIAT Sensor 3 Signal Voltage
ColdHighHigh
WarmLowLow

IAT Sensor 3 - Temperature, Resistance, Voltage Table

P00E9

  1. DTCs P0097, P0098, P0112, P0113, P0117, P0118, P0119, P00EA, or P00EB are not set.
  2. The vehicle has been OFF at least 8 hours.
  3. Ignition voltage is at least 11 V.
  4. These DTCs run once per ignition cycle when the enabling conditions are met.

P00E9-Condition 1

  1. The ECM determines the absolute difference between IAT sensor 1 start-up temperature and the IAT sensor 2 start-up temperature is less or equal to 30°C (54°F). AND
  2. The ECM determines the absolute difference between IAT sensor 3 start-up temperature and the IAT sensor 1 start-up temperature is greater than 25°C (77°F). AND
  3. The ECM determines the absolute difference between IAT sensor 3 start-up temperature and the IAT sensor 2 start-up temperature is greater than 25°C (77°F).

P00E9-Condition 2

  1. The ECM determines the IAT sensor 1 start-up temperature is between the IAT sensor 3 start-up temperature and the IAT sensor 2 start-up temperature AND
  2. The ECM determines the absolute difference between IAT sensor 3 start-up temperature and the IAT sensor 2 start-up temperature is greater than 25°C (77°F). AND
  3. The absolute difference between IAT sensor 3 start-up temperature and the IAT sensor 1 start-up temperature is greater than the absolute difference between IAT sensor 2 start-up temperature and the IAT sensor 1 start-up temperature.

P00E9-Condition 3

  1. The ECM determines the IAT sensor 2 start-up temperature is between the IAT sensor 3 start-up temperature and the IAT sensor 1 start-up temperature AND
  2. The ECM determines the absolute difference between IAT sensor 3 start-up temperature and the IAT sensor 1 start-up temperature is greater than 25°C (77°F). AND
  3. The absolute difference between IAT sensor 3 start-up temperature and the IAT sensor 2 start-up temperature is greater than the absolute difference between IAT sensor 2 start-up temperature and the IAT sensor 1 start-up temperature.

DTC P00E9 is a Type B DTC.

DTC P00E9 is a Type B DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Note. To minimize the effects of residual engine heat and sensor internal heating elements, perform Steps 1 and 2 of this verification procedure only if the ignition has been OFF for 8 hours or more.

  1. Ignition ON.
  2. Verify the following scan tool parameters are within 30°C (54°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 IAT Sensor 3 If not within 30°C (54°F) Refer to Circuit/System Testing. If within 30°C (54°F)
  3. Engine idling, verify the following scan tool parameters are between: -38 and +149°C (-36 and +300°F). IAT Sensor 1 IAT Sensor 2 IAT Sensor 3 If not between: -38 and +149°C (-36 and +300°F) Refer to Circuit System Testing. If between: -38 and +149°C (-36 and +300°F)
  4. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
  5. Verify the DTCs do not set. If any of the DTCs set Refer to Circuit/System Testing. If none of the DTCs set
  6. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Verify the integrity of the entire air induction system by verifying that none of the following conditions exist: A loose or disconnected charge air cooler hose or pipe A blocked or obstructed charge air cooler, including: after-market grill covers Any snow or ice build-up at the charge air cooler in cold climates Any mud or dirt build-up at the charge air cooler A restricted or collapsed air intake duct An intake manifold leak Improper operation of the positive crankcase ventilation (PCV) system A MAP sensor seal that is leaking, missing, or damaged A restricted or collapsed air intake duct A misaligned or damaged air intake duct Any water intrusion in the induction system An Intake Manifold Resonator with a leaking seal, or a cracked or broken housing If a condition exists Repair or replace component as appropriate. If no condition exists
  2. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
  3. Ignition OFF and all systems OFF. It may take up to for 2 minutes for all vehicle systems to power down. Test for less than 2 ohms between the low reference circuit terminal 3 and ground. If 2 ohms or greater Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
  4. Ignition OFF, all vehicle systems OFF, test for less than 2 ohms between the ground circuit terminal 7 and ground. If 2 ohms or greater Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 2 ohms
  5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit. Test for less than 2 ohms in the ignition voltage circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit. Test for infinite resistance between the ignition voltage circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for greater than 2 ohms between the ignition voltage circuit terminal 5 and ground. If less than 2 ohms, repair the short to ground on the circuit. If greater than 2 ohms, test all the components connected to the circuit and repair or replace as necessary. If a test lamp illuminates
  6. Ignition ON, test for 4.8-5.2 V between the intake air temperature signal 1 signal circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  7. Ignition ON, test for 4.8-5.2 V between the intake air temperature signal 2 circuit terminal 8 and ground. If less than 4.8 V Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  8. Ignition OFF, connect the leads of the EN-38522 Variable Signal Generator as follows: Red lead to the signal circuit terminal 8 at the harness connector Black leads to ground Battery voltage supply lead to B+
  9. Set the EN-38522 Variable Signal Generator to the following specifications. Signal switch to 5 V Duty Cycle switch to 50 % (Normal) Frequency switch to 30 Hz
  10. Ignition ON, verify the scan tool IAT Sensor 2 parameter is between 28-32 Hz. If not between 28-32 Hz Replace the K20 Engine Control Module. If between 28-32 Hz
  11. Ignition OFF, disconnect the harness connector at the B111B Turbocharger Boost/Intake Air Temperature sensor.
  12. Ignition OFF and all systems OFF. It may take up to for 2 minutes for all vehicle systems to power down. Test for less than 2 ohms between the low reference circuit terminal 1 and ground. If 2 ohms or greater Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
  13. Ignition ON, test for 4.8-5.2 V between the intake air temperature signal 3 signal circuit terminal 2 and ground. If less than 4.8 V Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  14. Test or replace the appropriate temperature sensor.

Multifunction Intake Air Sensor

  1. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
  2. Test the IAT sensor 1 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Intake Air Temperature Sensor (Hitachi Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) , «Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) table for Hitachi Sensors. The resistance values should be in range of the table values. If not within the specified range Replace the B75C Multifunction Intake Air sensor If within the specified range
  3. All OK.

Multifunction Intake Air Sensor

  1. Test the IAT Sensor 2 by varying the sensor temperature while monitoring the air temperature with a thermometer. Compare the readings with the scan tool IAT Sensor 2 parameter. The values should be within 5%. If not within the specified range Replace the B75C Multifunction Intake Air sensor If within the specified range
  2. All OK.

Turbocharger Boost/Intake Air Temperature Sensor; if equipped

  1. Ignition OFF, disconnect the harness connector at the B111B Turbocharger Boost/Intake Air Temperature sensor.
  2. Test the IAT sensor 3 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Intake Air Temperature Sensor (Hitachi Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) , «Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) table for Delco Sensors. The resistance values should be in range of the table values. If not within the specified range Replace the B111B Turbocharger Boost/Intake Air Temperature sensor If within the specified range
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Intake Air Pressure and Temperature Sensor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for turbocharger boost/intake air temperature sensor
  2. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for multifunction intake air sensor replacement.
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
IAT Sensor 3 SignalP00EA, P00EBP00E9, P00EB, P00ECP00EB, P00EC*P00E9
Low ReferenceP00E9, P00EB, P00ECP00EB, P00EC*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 3

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature; and engine bay conditions
IAT Sensor 3 Signal150°C (302°F)40°C (-40°F)40°C (-40°F)*
Low Reference40°C (-40°F)40°C (-40°F)*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 3

The intake air temperature (IAT) sensor 3 is a variable resistor that changes an engine control module (ECM) supplied 5 V signal. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F). The IAT sensor 3 is integrated with the throttle inlet absolute pressure sensor in the sensor bore, which is located before the throttle body. The ECM a ground for the IAT sensor 3 low reference circuit.

IAT Sensor 3IAT Sensor 3 ResistanceIAT Sensor 3 Signal Voltage
ColdHighHigh
WarmLowLow

IAT Sensor 3 - Temperature, Resistance, Voltage Table

P00EA, P00EB, and P00EC

  1. The ignition is ON, or the engine is running.
  2. The DTCs run continuously when the above conditions are met.

P00EA

The ECM detects that the IAT sensor 3 signal is warmer than 149°C (300°F) for at least 5 s.

P00EB

The ECM detects that the IAT sensor 3 signal is colder than -60°C (-76°F) for at least 5 s.

Note. The scan tool display range is between -40 and +150°C (-40 and +302°F).

P00EC

The ECM detects that the IAT sensor 3 signal is intermittent or has abruptly changed for at least 5 s.

  1. DTCs P00EA, P00EB, and P00EC are Type B DTCs.
  2. The ECM commands the cooling fans ON.

DTCs P00EA, P00EB, and P00EC are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Note. To minimize the effects of residual engine heat and sensor internal heating elements, perform Steps 1 and 2 of this verification procedure only if the ignition has been OFF for 8 hours or more.

  1. Ignition ON.
  2. Verify the following scan tool parameters are within 30°C (54°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 IAT Sensor 3 If not within 30°C (54°F) Refer to Circuit/System Testing. If within 30°C (54°F)
  3. Engine idling, verify the following scan tool parameters are between: -38 and +149°C (-36 and +300°F). IAT Sensor 1 IAT Sensor 2 IAT Sensor 3 If not between: -38 and +149°C (-36 and +300°F) Refer to Circuit System Testing. If between: -38 and +149°C (-36 and +300°F)
  4. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
  5. Verify the DTCs do not set. If any of the DTCs set Refer to Circuit/System Testing. If none of the DTCs set
  6. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Ignition OFF, disconnect the harness connector at the B111B Turbocharger Boost/Intake Air Temperature sensor.
  2. Ignition OFF and all systems OFF. It may take up to for 2 minutes for all vehicle systems to power down. Test for less than 2 ohms between the low reference circuit terminal 1 and ground. If 2 ohms or greater Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
  3. Ignition ON, test for 4.8-5.2 V between the intake air temperature signal 3 signal circuit terminal 2 and ground. If less than 4.8 V Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  4. Test or replace the B111B Turbocharger Boost/Intake Air Temperature sensor.

Turbocharger Boost/Intake Air Temperature Sensor; if equipped

  1. Ignition OFF, disconnect the harness connector at the B111B Turbocharger Boost/Intake Air Temperature sensor.
  2. Test the IAT sensor 3 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Intake Air Temperature Sensor (Hitachi Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) , «Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) table for Delco Sensors. The resistance values should be in range of the table values. If not within the specified range Replace the B111B Turbocharger Boost/Intake Air Temperature sensor If within the specified range
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Intake Air Pressure and Temperature Sensor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for turbocharger boost/intake air temperature sensor
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Ignition VoltageP0102P0101P0102P0101, P0103
SignalP0102P0102P0102P0102P0101, P0103, P1101
GroundP0102P0102P0102
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: 2,000-10,000 Hz
Ignition Voltage0 Hz0 Hz
Signal0 Hz0 Hz0 Hz
Ground0 Hz

MAF Sensor

Circuit Description

The intake flow rationality diagnostic provides the within-range rationality check for the mass air flow (MAF), manifold absolute pressure (MAP), and the throttle position sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.

  1. The throttle model describes the flow through the throttle body and is used to estimate the MAF through the throttle body as a function of barometric pressure (BARO), throttle position sensors, intake air temperature (IAT), and estimated MAP. The information from this model is displayed on the scan tool as the MAF Performance Test parameter.
  2. The first intake manifold model describes the intake manifold and is used to estimate MAP as a function of the MAF into the manifold from the throttle body and the MAF out of the manifold caused by engine pumping. The flow into the manifold from the throttle uses the MAF estimate calculated from the above throttle model. The information from this model is displayed on the scan tool as the MAP Performance Test 1 parameter.
  3. The second intake manifold model is identical to the first intake manifold model except that the MAF sensor measurement is used instead of the throttle model estimate for the throttle air input. The information from this model is displayed on the scan tool as the MAP Performance Test 2 parameter.
  4. The fourth model is created from the combination and additional calculations of the throttle model and the first intake manifold model. The information from this model is displayed on the scan tool as the Throttle Position Performance Test parameter.

The estimates of MAF and MAP obtained from this system of models and calculations are then compared to the actual measured values from the MAF, MAP, and the throttle position sensors; and where equipped - turbocharger boost pressure sensor; and to each other to determine the appropriate DTC to fail.

  1. DTC P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0114, P0117, P0118, P0128, P0335, or P0336 is not set.
  2. The engine speed is between 575-6,600 RPM
  3. The engine coolant temperature (ECT) is between -7 and +125°C (+19 and +257°F).
  4. The intake air temperature (IAT) is between -20 and +125°C (-4 and +257°F).
  5. The DTC runs continuously when the above conditions are met.

The engine control module (ECM) detects that the actual measured airflow from the MAF, MAP, and throttle position sensors is not within range of the calculated airflow that is derived from the system of models for greater than 2 s.

DTC P0101 is a Type B DTC.

DTC P0101 is a Type B DTC.

  1. Any type of contamination on the MAF sensor heating elements will degrade the proper operation of the sensor. Certain types of contaminants act as a heat insulator, which will impair the response of the sensor to airflow changes. Water or snow can create the opposite effect, and cause the signal to increase rapidly.
  2. Certain aftermarket air filters may cause this DTC to set.
  3. Certain aftermarket air induction systems may cause this DTC to set.
  4. Modifications to the air induction system may cause this DTC to set.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-38522 Variable Signal Generator

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

  1. Ignition ON.
  2. Verify that DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM, LCV without turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P0641, P0651, P0697, or P06A3 (ECM, LTG with turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
  3. If you were sent here from DTC P0068, P0106, P0121, P0236, or P1101; refer to Circuit/System Testing.
  4. Ignition ON.
  5. Verify the scan tool Throttle Body Idle Air Flow Compensation parameter is less than 90 %. If 90 % or greater Refer to «Throttle Body Cleaning»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions__throttle-body-cleaning) . If less than 90 %
  6. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Disagree Refer to «DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) , «DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If Agree
  7. Determine the current vehicle testing altitude.
  8. Verify the scan tool MAP Sensor pressure parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table. If the MAP Sensor parameter is not in range Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If the MAP Sensor parameter is within range
  9. Verify the engine is equipped with a turbocharger. If not equipped with a turbocharger Refer to Step 12. If equipped with a turbocharger
  10. Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table. If the Boost Pressure Sensor parameter is not in range Refer to «DTC P0236»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If the Boost Pressure Sensor parameter is within range
  11. Verify the scan tool Boost Pressure Sensor parameter decreases after starting the engine. If the Boost Pressure Sensor parameter does not decrease Refer to «DTC P0236»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If the Boost Pressure Sensor parameter does decrease
  12. Engine idling, verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 psi) and changes with accelerator pedal input. If not between 26-52 kPa (3.8-7.5 psi) or does not change Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If between 26-52 kPa (3.8-7.5 psi) and changes
  13. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3,000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. If the MAF Sensor parameter does not change smoothly and gradually Refer to Circuit/System Testing. If the MAF Sensor parameter changes smoothly and gradually
  14. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  15. Verify a DTC does not set. If any DTC sets Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If no DTCs set
  16. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Verify the integrity of the entire air induction system by verifying that none of the following conditions exist: Any damaged components Improper operation of turbocharger wastegate actuator or bypass valve; where equipped Improperly installed components Collapsed, restricted, or damaged components Loose clamps, cracks, or other damage An air flow restriction Improper operation of the positive crankcase ventilation system Restricted air filter Splits, kinks, leaks, or improper connections at the vacuum hoses Vacuum leaks at the intake manifold, MAP sensor, and throttle body Water intrusion Any snow or ice buildup, in cold climates Contamination of the Multifunction Intake Air sensor element If a condition is found Repair or replace component as appropriate. If no condition is found
  2. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
  3. Ignition OFF and all systems OFF. It may take up to for 2 minutes for all vehicle systems to power down. Test for less than 2 ohms between the ground circuit terminal 7 and ground. If 2 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 2 ohms
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit. Test for less than 2 ohms in the ignition voltage circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit. Test for infinite resistance between the ignition voltage circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for greater than 2 ohms between the ignition voltage circuit terminal 5 and ground. If less than 2 ohms, repair the short to ground on the circuit. If greater than 2 ohms, test all the components connected to the circuit and repair or replace as necessary. If a test lamp illuminates
  5. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 6 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  6. Ignition OFF, connect the leads of the EL-38522 Variable Signal Generator as follows: Red lead to the signal circuit terminal 6 at the harness connector Black leads to ground Battery voltage supply lead to B+
  7. Set the EL-38522 Variable Signal Generator to the following specifications. Signal switch to 5 V Frequency switch to 5 kHz Duty Cycle switch to 50 % (Normal)
  8. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,050 Hz. If not between 4,950-5,050 Hz. If not between 4,950-5,050 Hz, replace the K20 Engine Control Module. If between 4,950-5,050 Hz.
  9. Test or replace the B75C Multifunction Intake Air sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for multifunction intake air sensor replacement.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Ignition VoltageP0102P0101P0102P0101, P0103
SignalP0102P0102P0102P0102P0101, P0103, P1101
GroundP0102P0102P0102
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: 2,000-10,000 Hz
Ignition Voltage0 Hz0 Hz
Signal0 Hz0 Hz0 Hz
Ground0 Hz

MAF Sensor

The mass air flow (MAF) sensor is integrated with the multifunction intake air sensor. The MAF sensor is an air flow meter that measures the amount of air in the sensor bore. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine indicates an acceleration or high load condition.

The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. The sensor uses the voltage to produce a variable frequency signal based on the inlet air flow through the sensor bore. The signal varies with engine load and is displayed by the scan tool as Hertz (Hz) and grams per second (g/s). Ignition voltage and ground circuits are also supplied to the multifunction intake air sensor's internal circuits for these sensors

  1. Intake Air Temperature (IAT) sensor 2
  2. Humidity sensor
  3. MAF sensor

The multifunction intake air sensor houses the following

  1. IAT sensor 1
  2. IAT sensor 2
  3. Humidity sensor
  4. MAF sensor
  5. BARO pressure sensor
  1. The engine is running for at least 1 s.
  2. The engine speed is at least 300 RPM.
  3. The ignition signal is at least 11 V.
  4. The above conditions are met for at least 1 s.
  5. The DTC runs continuously when the above conditions are met.

P0102

The ECM detects that the MAF Sensor signal parameter is less than 500 Hz (about 0.25 g/s) for at least 250 cylinder firing events.

P0103

The ECM detects that the MAF Sensor signal parameter is at least 11,000 Hz (about 328 g/s) for at least 250 cylinder firing events.

DTCs P0102 and P0103 are Type B DTCs.

DTCs P0102 and P0103 are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-38522 Variable Signal Generator

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

  1. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 2.5-5.0 g/s. If not between 2.5-5.0 g/s Refer to Circuit/System Testing. If between 2.5-5.0 g/s
  2. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3,000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. The MAF Sensor parameter does not change smoothly and gradually Refer to Circuit/System Testing. The MAF Sensor parameter changes smoothly and gradually
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  4. Verify a DTC does not set. If any DTC sets Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If no DTCs set
  5. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 2 ohms between the ground circuit terminal 7 and ground. If 2 ohms or greater Ignition OFF. Disconnect the sensor chassis ground. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the chassis ground connection. If less than 2 ohms
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit. Test for less than 2 ohms in the ignition voltage circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit. Test for infinite resistance between the ignition voltage circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for greater than 2 ohms between the ignition voltage circuit terminal 5 and ground. If less than 2 ohms, repair the short to ground on the circuit. If greater than 2 ohms, test all the components connected to the circuit and repair or replace as necessary. If 2 ohms or greater, repair the open or high resistance in the circuit. If the circuit tests normal and the fuse is open, test all the components connected to the circuit and repair or replace as necessary. If a test lamp illuminates
  4. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 6 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  5. Ignition OFF, connect the leads of the EL-38522 Variable Signal Generator as follows: Red lead to the signal circuit terminal 6 at the harness connector Black leads to ground Battery voltage supply lead to B+
  6. Set the EL-38522 Variable Signal Generator to the following specifications. Signal switch to 5 V Frequency switch to 5 kHz Duty Cycle switch to 50 % (Normal)
  7. Engine idling, verify the scan tool MAF Sensor parameter is between 4,950-5,050 Hz. If not between 4,950-5,050 Hz. If not between 4,950-5,050 Hz, replace the K20 Engine Control Module. If between 4,950-5,050 Hz.
  8. Test or replace the B75C Multifunction Intake Air sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for multifunction intake air sensor replacement.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
5 V ReferenceP0107, P0697P0106, P0107P0107P0106, P0108, P0697P0106
SignalP0106, P0107, P0697P0106, P0107P0107P0106, P0108*P0106, P1101
Low ReferenceP0106, P0108P0106, P0108P0106
* Internal ECM or sensor damage may occur if the circuit is shorted to B+.
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: 12-103 kPa (1.7-14.9 PSI)
5 V Reference0 kPa (0 PSI)0 kPa (0 PSI)104 kPa (15.1 PSI)
Signal0 kPa (0 PSI)0 kPa (0 PSI)104 kPa (15.1 PSI)*
Low Reference80-103 kPa (11.6-14.9 PSI)
* Internal ECM or sensor damage may occur if the circuit is shorted to B+.

MAP Sensor

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: 12-225 kPa (1.7-32.6 PSI)
5 V Reference0 kPa (0 PSI)0 kPa (0 PSI)255 kPa (36.9 PSI)
Signal0 kPa (0 PSI)0 kPa (0 PSI)255 kPa (36.9 PSI)*
Low Reference255 kPa (36.9 PSI)
* Internal ECM or sensor damage may occur if the circuit is shorted to B+.

MAP Sensor, if equipped with Turbocharger

The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by engine speed, throttle opening, air temperature, barometric pressure (BARO); and if equipped turbocharger output. A diaphragm within the MAP sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance.

The MAP sensor wiring includes 3 circuits. The engine control module (ECM) supplies a regulated 5 volts to the sensor on a 5 V reference circuit. The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.

Under normal operation the greatest pressure that can exist in the intake manifold is at ignition ON, engine OFF, which is equal to the BARO. If equipped, a turbocharger can increase the pressure above BARO, when the vehicle is operated at wide-open throttle (WOT). The lowest manifold pressure occurs when the vehicle is idling or decelerating. The ECM monitors the MAP sensor signal for pressure outside of the normal range.

  1. DTCs P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0125, P0128, P222C, P222D, P0335, P0336, P0401, P042E, P2227, P2228, P2229, P2230, or P2610 are not set
  2. The engine speed is between 500 and 6800 RPM.
  3. The ECT Sensor is between -7 to +126°C (+19 to +258°F).
  4. The IAT Sensor is between -20 to +125°C (-4 to +257°F).
  5. This DTC runs continuously when the above conditions are met.

The engine control module (ECM) detects that the MAP Sensor pressure is not within range of the calculated pressure that is derived from a system of models, for greater than 0.5 s.

DTC P0106 is a Type B DTC.

DTC P0106 is a Type B DTC.

Schematic Reference

Connector End View Reference

Powertrain Component View

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

GE-23738-A Vacuum Pump

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

  1. Ignition ON, verify that DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM, LCV without turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P0641, P0651, P0697, or P06A3 (ECM, LTG with turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
  2. If you were sent here from DTC P0068, P0101, P0121, P0236, or P1101; refer to Circuit/System Testing.
  3. Ignition ON, verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90%. If 90% or greater Refer to «Throttle Body Cleaning»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions__throttle-body-cleaning) for this publication. If less than 90%
  4. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Disagree Refer to «DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) , «DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If Agree
  5. Determine the current vehicle testing altitude.
  6. Verify the scan tool MAP Sensor parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table. If the MAP Sensor parameter is not in range Refer to Circuit/System Testing. If the MAP Sensor parameter is within range
  7. Verify if the engine is equipped with a turbocharger. If not equipped with a turbocharger Refer to Step 10. If equipped with a turbocharger
  8. Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table. If the Boost Pressure Sensor parameter is not in range Refer to «DTC P0236»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If the Boost Pressure Sensor parameter is within range
  9. Verify the scan tool Boost Pressure Sensor parameter decreases after starting the engine. If the Boost Pressure Sensor parameter does not decrease Refer to «DTC P0236»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. If the Boost Pressure Sensor parameter does decrease
  10. Engine idling, verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 PSI) and changes with accelerator pedal input. If not between 26-52 kPa (3.8-7.5 PSI) or does not change Refer to Circuit/System Testing. If between 26-52 kPa (3.8-7.5 PSI) and changes
  11. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. The MAF Sensor parameter does not change smoothly and gradually Refer to «DTC P0101»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) for further diagnosis. The MAF Sensor parameter changes smoothly and gradually
  12. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  13. Verify a DTC does not set. If any DTC sets Refer to Circuit/System Testing. If no DTCs set
  14. All OK.
  1. Verify the integrity of the entire air induction system and verify that none of the following conditions exist: Any damaged components Improper operation of turbocharger wastegate actuator or bypass valve; if equipped Loose or improper installation of the turbocharger and the charge air cooler, including the flexible ductwork; if equipped An air flow restriction Any vacuum leak Improperly routed vacuum hoses A restriction in the MAP Sensor port, or the BARO port; if equipped Proper operation of the positive crankcase ventilation system Missing, restricted or leaking exhaust components. Refer to «Symptoms - Engine Exhaust»(/cadillac/ats/i-2012-2014/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) . Engine mechanical condition; for example: low compression or incorrect timing chain installation. Refer to «Symptoms - Engine Mechanical (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) , «Symptoms - Engine Mechanical (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) . If a condition is found Repair or replace the component as appropriate. If no condition is found
  2. Ignition OFF, and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down. Disconnect the harness connector at the B74 Manifold Absolute Pressure Sensor.
  3. Test for less than 2 ohms between the low reference circuit terminal 2 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 2 ohms
  4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. NOTE: If the signal circuit is shorted to a voltage the ECM or the MAP Sensor may be damaged. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  5. Ignition ON, verify the scan tool MAP Sensor parameter is less than 0.5 V. If 0.5 V or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit terminal 3 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If less than 0.5 V
  6. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1.
  7. Ignition ON, verify the scan tool MAP Sensor voltage parameter is greater than 4.5 V. If 4.5 V or less Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Remove the jumper wire, test for infinite resistance between the signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 4.5 V
  8. Test or replace the B74 Manifold Absolute Pressure Sensor.

Note. You must perform the Circuit/System Testing in order to verify the integrity of the MAP Sensor circuits before proceeding with the Component Testing.

Skewed Sensor Test

  1. Ignition OFF, remove the B74 Manifold Absolute Pressure Sensor from the engine. Connect the harness to the sensor, if disconnected.
  2. Ignition ON, apply 17 kPa (5.0 in Hg) of vacuum to the B74 Manifold Absolute Pressure Sensor, with the GE-23738-A . Verify the scan tool MAP Sensor parameter decreases between 13-21 kPa (1.8-3.0 PSI). If the parameter does not decrease between 13-21 kPa (1.8-3.0 PSI). Replace the B74 Manifold Absolute Pressure Sensor. If the parameter does decrease between 13-21 kPa (1.8-3.0 PSI).
  3. Apply 34 kPa (10.0 in Hg) of vacuum to the B74 Manifold Absolute Pressure Sensor, with the GE-23738-A . Verify the scan tool MAP Sensor parameter decreases between 30-38 kPa (4.4-5.5 PSI). If the parameter does not decrease between 30-38 kPa (4.4-5.5 PSI). Replace the B74 Manifold Absolute Pressure Sensor. If the parameter does decrease between 30-38 kPa (4.4-5.5 PSI).
  4. All OK.

Erratic Signal Test

  1. Ignition OFF, remove the B74 Manifold Absolute Pressure Sensor and disconnect the harness.
  2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 of the sensor and the sensor harness.
  3. Install a jumper wire between the low reference circuit terminal 2 of the sensor and ground.
  4. Install a jumper wire to the signal circuit terminal 3 of the sensor.
  5. Connect a DMM between the jumper wire and ground.
  6. Ignition ON, observe the DC voltage on the DMM. Slowly apply between 0-15 kPa (0-4.4 in Hg) of vacuum to the sensor with the GE-23738-A . Verify the voltage changes, without any spikes or dropouts and is between 0.2-4.9 V. If not between 0.2-4.9 V or has spikes or dropouts Replace the B74 Manifold Absolute Pressure Sensor. If between 0.2-4.9 V and there are no spikes or dropouts
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming, and setup
  2. «Manifold Absolute Pressure Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
5 V ReferenceP0107, P0697P0106, P0107P0107P0106, P0108, P0697P0106
SignalP0106, P0107, P0697P0106, P0107P0107P0106, P0108*P0106, P1101
Low ReferenceP0106, P0108P0106, P0108P0106
* Internal ECM or sensor damage may occur if the circuit is shorted to B+.
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: 12-103 kPa (1.7-14.9 PSI) (Varies with altitude)
5 V Reference0 kPa (0 PSI)0 kPa (0 PSI)104 kPa (15.1 PSI)
Signal0 kPa (0 PSI)0 kPa (0 PSI)104 kPa (15.1 PSI)*
Low Reference80-103 kPa (11.6-14.9 PSI)
* Internal ECM or sensor damage may occur if the circuit is shorted to B+.

MAP Sensor

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: 12-225 kPa (1.7-32.6 PSI) (Varies with altitude)
5 V Reference0 kPa (0 PSI)0 kPa (0 PSI)255 kPa (36.9 PSI)
Signal0 kPa (0 PSI)0 kPa (0 PSI)255 kPa (36.9 PSI)*
Low Reference255 kPa (36.9 PSI)
* Internal ECM or sensor damage may occur if the circuit is shorted to B+.

MAP Sensor, if equipped with Turbocharger

The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by engine speed, throttle opening, air temperature, barometric pressure (BARO); and if equipped turbocharger output. A diaphragm within the MAP sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance.

The MAP sensor wiring includes 3 circuits. The engine control module (ECM) supplies a regulated 5 volts to the sensor on a 5 V reference circuit. The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.

Under normal operation the greatest pressure that can exist in the intake manifold is at ignition ON, engine OFF, which is equal to the BARO. If equipped, a turbocharger can increase the pressure above BARO, when the vehicle is operated at wide-open throttle (WOT). The lowest manifold pressure occurs when the vehicle is idling or decelerating. The ECM monitors the MAP sensor signal for pressure outside of the normal range.

P0107

This DTC runs continuously.

P0108

This DTC runs continuously.

P0107

The ECM detects that the MAP Sensor voltage is less than 0.15 V for more than 13 ms.

P0108

The ECM detects that the MAP Sensor voltage is more than 4.50 V for greater than 13 ms.

DTCs P0107 and P0108 are Type B DTCs.

DTCs P0107 and P0108 are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

GE-23738-A Vacuum Pump

For equivalent regional tools, refer to Special Tools (Diagnostic Tools)

  1. Ignition ON, verify that DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM, LCV without turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P0641, P0651, P0697, or P06A3 (ECM, LTG with turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
  2. Determine the current vehicle testing altitude.
  3. Verify the scan tool MAP Sensor parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table. If the MAP Sensor parameter is not in range Refer to Circuit/System Testing for further diagnosis. If the MAP Sensor parameter is within range
  4. Verify the engine is equipped with a turbocharger. If not equipped with a turbocharger Refer to Step 6. If equipped with a turbocharger
  5. Engine idling, verify the scan tool MAP Sensor voltage parameter is between 0.3-4.8 V and changes with accelerator pedal input. If not between 0.3-4.8 V or does not change Refer to Circuit/System Testing. If between 0.3-4.8 V and changes Refer to Step 7.
  6. Engine idling, verify the scan tool MAP Sensor voltage parameter is between 0.2-4.5 V and changes with accelerator pedal input. If not between 0.2-4.5 V or does not change Refer to Circuit/System Testing. If between 0.2-4.5 V and changes
  7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
  8. Verify the DTC does not set. If any DTC sets Refer to Circuit/System Testing. If no DTC sets
  9. All OK.
  1. Ignition OFF, disconnect the harness connector at the B74 Manifold Absolute Pressure Sensor.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down. Test for less than 2 ohms between the low reference circuit terminal 2 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 2 ohms
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. NOTE: If the signal circuit is shorted to a voltage the ECM or the MAP Sensor may be damaged. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  4. Ignition ON, verify the scan tool MAP Sensor parameter is less than 0.5 V. If 0.5 V or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit terminal 3 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If less than 0.5 V
  5. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1.
  6. Ignition ON, verify the scan tool MAP Sensor voltage parameter is greater than 4.5 V. If 4.5 V or less Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Remove the jumper wire, test for infinite resistance between the signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 4.5 V
  7. Test or replace the B74 Manifold Absolute Pressure Sensor.

Note. You must perform the Circuit/System Testing in order to verify the integrity of the MAP Sensor circuits before proceeding with the Component Testing.

Skewed Sensor Test

  1. Ignition OFF, remove the B74 Manifold Absolute Pressure Sensor from the engine. Connect the harness to the sensor, if disconnected.
  2. Ignition ON, apply 17 kPa (5.0 in Hg) of vacuum to the B74 Manifold Absolute Pressure Sensor, with the GE-23738-A . Verify the scan tool MAP pressure parameter decreases between 13-21 kPa (1.8-3.0 PSI). If the parameter does not decrease between 13-21 kPa (1.8-3.0 PSI) Replace the B74 Manifold Absolute Pressure Sensor. If the parameter does decrease between 13-21 kPa (1.8-3.0 PSI)
  3. Apply 34 kPa (10.0 in Hg) of vacuum to the B74 Manifold Absolute Pressure Sensor, with the GE-23738-A . Verify the scan tool MAP pressure parameter decreases between 30-38 kPa (4.4-5.5 PSI). If the parameter does not decrease between 30-38 kPa (4.4-5.5 PSI) Replace the B74 Manifold Absolute Pressure Sensor. If the parameter does decrease between 30-38 kPa (4.4-5.5 PSI)
  4. All OK.

Erratic Signal Test

  1. Ignition OFF, remove the B74 Manifold Absolute Pressure Sensor and disconnect the harness.
  2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 of the sensor and the sensor harness.
  3. Install a jumper wire between the low reference circuit terminal 2 of the sensor and ground.
  4. Install a jumper wire to the signal circuit terminal 3 of the sensor.
  5. Connect a DMM between the jumper wire and ground.
  6. Ignition ON, observe the DC voltage on the DMM. Slowly apply between 0-15 kPa (0-4.4 in Hg) of vacuum to the sensor with the GE-23738-A Vacuum Pump. Verify the voltage changes, without any spikes or dropouts and is between 0.2-4.9 V. If not between 0.2-4.9 V or has spikes or dropouts Replace the B74 Manifold Absolute Pressure Sensor. If between 0.2-4.9 V and there are no spikes or dropouts
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Manifold Absolute Pressure Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalP0112, P0114, P2199P0111, P0113, P0114, P2199P0097*, P0113, P0114, P11C2, P2199P0111, P2199
Low ReferenceP0111, P0113, P0114, P2199P0113*, P0114
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 1

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ignition VoltageP0096, P0097, P0102, P11C2, P2199P0096, P0097, P0102, P11C2, P2199P0096
SignalP0096, P0097, P11C3, P2199P0096, P0097, P11C2, P2199P0096*, P0097, P11C2, P2199P0096
GroundP0096, P0097, P0102, P11C2, P2199P0096
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 2

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
Signal150°C (302°F)40°C (-40°F)40°C (-40°F)*
Low Reference40°C (-40°F)40°C (-40°F)*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 1

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
Ignition Voltage40°C (-40°F) 10 Hz40°C (-40°F) 10 Hz
Signal40°C (-40°F) 10 Hz40°C (-40°F) 10 Hz40°C (-40°F)* 10 Hz
Ground40°C (-40°F) 10 Hz
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 2

The intake air temperature (IAT) sensor 1 is a variable resistor that measures the temperature of the air in the sensor bore. The engine control module (ECM) supplies 5 V to the IAT sensor 1 signal circuit and a ground for the IAT sensor 1 low reference circuit. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F).

The multifunction intake air sensor houses the following

  1. IAT sensor 1
  2. IAT sensor 2
  3. Humidity sensor
  4. Mass Air Flow (MAF) sensor
  5. BARO pressure sensor
IAT Sensor 1IAT Sensor 1 ResistanceIAT Sensor 1 Signal Voltage
ColdHighHigh
WarmLowLow

IAT Sensor 1 - Temperature, Resistance, Voltage Table

P0112, P0113, and P0114

  1. The ignition is ON, or the engine is running.
  2. The DTCs run continuously when the above conditions are met.

P0112

Note. The scan tool display range is between -40 and +150°C (-40 and +302°F).

The ECM detects that the sensor signal is warmer than 150°C (302°F) for at least 5 s.

P0113

Note. The scan tool display range is between -40 and +150°C (-40 and +302°F).

The ECM detects that the sensor signal is colder than -60°C (-76°F) for at least 5 s.

P0114

The ECM monitors the sensor signal every 0.1 s, to determine if the signal has changed more than 125°C (257°F) during a 4 s time peroid.

  1. DTCs P0112, P0113, and P0114 are Type B DTCs.
  2. The ECM commands the cooling fans ON.

DTCs P0112, P0113, and P0114 are Type B DTCs.

  1. With the ignition ON, when the engine is cold and not running, a properly functioning IAT sensor 1 will gradually increase the scan tool IAT Sensor 1 parameter. This is due to the heat that is generated by the multifunction intake air sensor internal heating elements.
  2. Depending on the ambient temperature, an IAT sensor 1 signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit can cause a DTC P0113 and/or P0114 to set. This condition causes a rapid fluctuation in the IAT Sensor 1 parameter.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Note. To minimize the effects of residual engine heat and sensor internal heating elements, perform Steps 1 and 2 of this verification procedure only if the ignition has been OFF for 8 hours or more.

  1. Ignition ON.
  2. Verify the following scan tool parameters are within 30°C (54°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 IAT Sensor 3; where equipped If not within 30°C (54°F) Refer to Circuit/System Testing. If within 30°C (54°F)
  3. Engine idling, verify the following scan tool parameters are between: -38 and +149°C (-36 and +300°F). IAT Sensor 1 IAT Sensor 2 IAT Sensor 3; where equipped If not between: -38 and +149°C (-36 and +300°F) Refer to Circuit/System Testing. If between: -38 and +149°C (-36 and +300°F)
  4. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
  5. Verify the DTCs do not set. If any of the DTCs set Refer to Circuit/System Testing. If none of the DTCs set
  6. All OK
  1. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
  2. Ignition OFF all systems OFF. It may take up to for 2 minutes for all vehicle systems to power down. Test for less than 2 ohms between the low reference circuit terminal 3 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 engine control module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 engine control module. If less than 2 ohms
  3. Ignition ON, test for 4.8-5.2 V between the intake air temperature sensor 1 signal circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 engine control module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 engine control module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 engine control module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 engine control module. If between 4.8-5.2 V
  4. Test or replace the B75C Multifunction Intake Air sensor.

Multifunction Intake Air Sensor

  1. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
  2. Test the IAT sensor 1 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Intake Air Temperature Sensor (Hitachi Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) , «Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-intake-air) table for Hitachi Sensors. The resistance values should be in range of the table values. If not within the specified range Replace the B75C Multifunction Intake Air sensor If within the specified range
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for multifunction intake air sensor replacement.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalP0117P0118, P0119P0118*,P0119P0116, P0128
Low ReferenceP0118, P0119P0128
*ECM or sensor damage may occur if the circuit is shorted to B+.
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: Varies with coolant temperature
Signal150°C (302°F)40°C (-40°F)40°C (-40°F)
Low Reference40°C (-40°F)

ECT Sensor

The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 V to the ECT sensor signal circuit and a ground for the low reference circuit. This diagnostic checks for an open, short to ground or an intermittent circuit condition between the ECM and ECT sensor.

P0117

  1. The ignition is ON. OR
  2. The engine is running.
  3. This DTC runs continuously within the enabling conditions.

P0118

  1. The ignition is ON. OR
  2. The engine is running for greater than 10 s. OR
  3. The engine run time is less than 10 s when the IAT is warmer than -7°C (19°F).
  4. This DTC runs continuously within the enabling conditions.

P0119

  1. No active DTCs set.
  2. The ignition is ON.
  3. This DTC runs continuously within the enabling conditions.

P0117

The ECM detects that the ECT is warmer than 149°C (300°F) for greater than 5 s.

P0118

The ECM detects that the ECT is colder than -39°C (-38°F) for greater than 5 s.

P0119

The ECM detects that the ECT is intermittent or has abruptly changed for greater than 3 seconds.

  1. DTC P0117, P0118 or P0119 are a Type B DTC.
  2. The cooling fans will be commanded ON.
  3. The Engine Coolant Temperature Gauge is inoperative.
  4. The AC compressor will be commanded OFF.

DTC P0117, P0118 or P0119 are a Type B DTC.

Note. The engine coolant temperature (ECT) sensor 1 is mounted on the engine and the engine coolant temperature (ECT) sensor 2, radiator coolant temperature (RCT) sensor, is mounted on the radiator.

  1. The engine coolant temperature gauge will display full cold when an ECT DTC set's.
  2. After starting the engine, the engine coolant temperature (ECT) sensor 1 temperature should rise steadily, then stabilize after the thermostat opens.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify the scan tool ECT Sensor parameter is warmer than -40° C (-40° F) and colder than 150° C 302° F) and changes with engine run time. If colder than -39° C (-38° F) or warmer than 149° C 300°F) or does not change Refer to Circuit/System Testing. If warmer than -40° C (-40°F) and colder than 150° C 302°F) and changes
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  5. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the B34 Engine Coolant Temperature sensor harness connector at the sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the low reference circuit terminal A or 2 and ground. If 5 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
  3. Ignition ON.
  4. Verify the scan tool ECT Sensor parameter is colder than -39° C (-38° F). If warmer than -39° C (-38° F) Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit terminal B or 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If colder than -39° C (-38° F)
  5. Install a 3 A fused jumper wire between the signal circuit terminal B or 1 and the low reference circuit terminal A or 2.
  6. Verify the scan tool ECT sensor parameter is warmer than 149° C (300° F). If 149° C (300° F) or colder Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If warmer than 149° C (300° F)
  7. Test or replace the B34 Engine Coolant Temperature Sensor.
  1. Ignition OFF, disconnect the harness connector at the B34 Engine Coolant Temperature Sensor.
  2. Test the ECT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Engine Coolant Temperature Sensor»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__temperature-versus-resistance-engine-coolant) table. The resistance values should be in range of the table values. If not within the specified range Replace the B34 Engine Coolant Temperature Sensor. If within the specified range
  3. Test for infinite resistance between each terminal and the sensor housing. If less than infinite resistance Replace the B34 Engine Coolant Temperature Sensor. If infinite resistance
  4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Engine Coolant Temperature Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP06A3P0122*, P0222*, P16A0P06A3P0121, P16A2, P2135*
SignalP0122*, P0222*, P16A0P0122*, P0222*, P16A1P0123*, P0223*, P16A0**, P16A1**, P16A2**P0121, P16A2, P2135*
Low ReferenceP0123*, P0223*, P16A1P0121, P16A2, P2135*
* This DTC set indicates an internal throttle body condition. ** A short to voltage causes P16A1 to set. If DTC P16A0, P16A1, and P16A2 set at the same time, an intermittent circuit condition exists.
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: The engine is operating with the throttle closed. All accessories OFF. Parameter Normal Range: Throttle Position Sensor 1 3.75-4.75 V
5 V Reference5.0 V5.0 V5.0 V
Signal5.0 V0.0 V0.0 V
Low Reference0.0 V

Throttle Position Sensor 1

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: The engine is operating with the throttle closed. All accessories OFF. Parameter Normal Range: Throttle Position Sensor 2 0.45-0.90 V
5 V Reference0.0 V0.0 V0.0 V
Signal0.0 V5.0 V5.0 V
Low Reference5.0 V

Throttle Position Sensor 2

The throttle body assembly contains a contact-less inductive throttle position sensing element that is managed by a customized integrated circuit. The throttle position sensor is mounted within the throttle body assembly and is not serviceable. The engine control module (ECM) supplies the throttle body with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and an asynchronous signal/serial data circuit. The asynchronous signal means communication is only going from the throttle body to the ECM. The throttle body cannot receive data from the ECM over the signal/serial data circuit. The throttle position sensor provides a signal voltage that changes relative to throttle blade angle. The customized integrated circuit translates the voltage based position information into serial data using the Society of Automotive Engineers (SAE) J2716 Single Edge Nibble Transmission (SENT) protocol. The throttle position sensor information is transmitted between the throttle body and the ECM on the signal/serial data circuit. The ECM decodes the serial data signal into separate voltages which are displayed on a scan tool as the voltage inputs from throttle position sensors 1 and 2.

P0121

  1. DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0335, or P0336 is not set.
  2. The engine speed is between 575-6,600 RPM.
  3. The engine coolant temperature (ECT) is -7 to +125°C (19-257°F).
  4. The intake air temperature (IAT) is -20 to +125°C (-4 to +257°F).
  5. The DTC runs continuously when the above conditions are met.

P0122, P0123, P0222, P0223

  1. DTC P06A3 is not set.
  2. The ignition is ON or the engine is running.
  3. The run/crank or powertrain relay voltage is greater than 6.41 V and reduced power is not active.
  4. The DTCs run continuously when the above condition are met.

P16A0, P16A1, or P16A2

  1. DTC P06A3 is not set.
  2. The ignition is ON or the engine is operating.
  3. The run/crank voltage is greater than 6.41 V.
  4. The DTCs run continuously once the above conditions are met for greater than 1 s.

P2135

  1. DTCs P0122, P0123, P0222, P0223, or P06A3 are not set.
  2. The ignition is ON or the engine is running.
  3. The run/crank or powertrain relay voltage is greater than 6.41 V and reduced power is not active.
  4. The DTC runs continuously when the above conditions are met.

P0121

The ECM detects that the throttle position sensor 1 voltage is stuck within normal operating range for greater than 1 s.

P0122

The ECM detects the throttle position sensor 1 signal voltage is less than 0.32 V for greater than 1 s.

P0123

The ECM detects the throttle position sensor 1 signal voltage is greater than 4.75 V for greater than 1 s.

P0222

The ECM detects the throttle position sensor 2 signal voltage is less than 0.25 V for greater than 1 s.

P0223

The ECM detects the throttle position sensor 2 signal voltage is greater than 4.59 V for greater than 1 s.

P16A0

The ECM detects a low voltage circuit condition on the throttle position sensor signal circuit for greater than 1 s.

P16A1

The ECM detects a high voltage circuit condition on the throttle position sensor signal circuit for greater than 1 s.

P16A2

The ECM detects an incorrect message was received over the throttle position sensor signal circuit for greater than 1 s.

P2135

The ECM detects that throttle position sensors 1 and 2 disagree greater than 7-10 percent for greater than 1 s.

  1. DTCs P0121 is a Type B DTC.
  2. DTCs P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, and P2135 are Type A DTCs.
  3. The ECM commands the throttle actuator control (TAC) system to operate in a Reduced Engine Power mode.
  4. A message center or an indicator displays Reduced Engine Power.
  5. Under certain conditions, the ECM commands the engine OFF.
  1. DTCs P0121 is a Type B DTC.
  2. DTCs P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, and P2135 are Type A DTCs.
  1. A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC to set.
  2. If the accelerator pedal is pressed to the wide open throttle position, the throttle blade angle or Throttle Position angle is limited to less than 40 percent.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON
  2. Verify that DTC P0601-P0606, P06A3, and P16F3 is not set. If a DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If a DTC is not set
  3. Verify the scan tool Throttle Body Idle Air flow Compensation parameter is less than 90 %. If 90 % or greater Refer to «Throttle Body Cleaning»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions__throttle-body-cleaning) . If less than 90 %
  4. Verify that DTC P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, or P2135 are not set. If DTC P0122, P0123, P0222, P0223, or P2135 are the only DTCs set Replace the Q38 Throttle Body. If DTC P16A0, P16A1, or P16A2 is set with any of the DTCs Refer to Circuit/System Testing If none of the DTCs are set
  5. Verify the Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Agree is not displayed Replace the Q38 Throttle Body. If Agree is displayed
  6. Verify DTC P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, and P2135 is not set. If a DTC is set Refer to Circuit/System Testing. If a DTC is not set
  7. Determine the current vehicle testing altitude.
  8. Verify the scan tool MAP Sensor pressure parameter is within range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table. If the MAP Sensor pressure is not in range Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If the MAP Sensor pressure is within range
  9. Engine idling.
  10. Verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 psi) and changes with accelerator pedal input. If not between 26-52 kPa (3.8-7.5 psi) or does not change Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If between 26-52 kPa (3.8-7.5 psi) and changes
  11. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3,000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. If the MAF Sensor parameter does not change smoothly and gradually Refer to «DTC P0101»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If the MAF Sensor parameter changes smoothly and gradually
  12. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  13. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  14. All OK.
  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at Q38 Throttle Body. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the low reference circuit terminal 4 and ground. If 5 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 5 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  5. Ignition ON.
  6. Test for 4.8-5.2 V between the signal circuit terminal 3 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  7. Replace the Q38 Throttle Body.
  1. «Throttle Body Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup

Repair Verification

  1. Install any components that have been removed or replaced during diagnosis.
  2. Perform any adjustments, programming or setup procedures that are required when a component is removed or replaced.
  3. Clear the DTCs with a scan tool.
  4. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
  5. Ignition ON.
  6. Verify the Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Agree is not displayed Test or replace the Q38 Throttle Body. If Agree is displayed
  7. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not set. If DTC sets Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If DTC does not set
  8. All OK.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP06A3P0122*, P0222*, P16A0P06A3P0121, P16A2, P2135*
SignalP0122*, P0222*, P16A0P0122*, P0222*, P16A1P0123*, P0223*, P16A0**, P16A1**, P16A2**P0121, P16A2, P2135*
Low ReferenceP0123*, P0223*, P16A1P0121, P16A2, P2135*
* This DTC set indicates an internal throttle body condition. ** A short to voltage causes P16A1 to set. If DTC P16A0, P16A1, and P16A2 set at the same time, an intermittent circuit condition exists.
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: The engine is operating with the throttle closed. All accessories OFF. Parameter Normal Range: Throttle Position Sensor 1 3.75-4.75 V
5 V Reference5.0 V5.0 V5.0 V
Signal5.0 V0.0 V0.0 V
Low Reference0.0 V

Throttle Position Sensor 1

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: The engine is operating with the throttle closed. All accessories OFF. Parameter Normal Range: Throttle Position Sensor 2 0.45-0.90 V
5 V Reference0.0 V0.0 V0.0 V
Signal0.0 V5.0 V5.0 V
Low Reference5.0 V

Throttle Position Sensor 2

The throttle body assembly contains a contact-less inductive throttle position sensing element that is managed by a customized integrated circuit. The throttle position sensor is mounted within the throttle body assembly and is not serviceable. The engine control module (ECM) supplies the throttle body with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and an asynchronous signal/serial data circuit. The asynchronous signal means communication is only going from the throttle body to the ECM. The throttle body cannot receive data from the ECM over the signal/serial data circuit. The throttle position sensor provides a signal voltage that changes relative to throttle blade angle. The customized integrated circuit translates the voltage based position information into serial data using the Society of Automotive Engineers (SAE) J2716 Single Edge Nibble Transmission (SENT) protocol. The throttle position sensor information is transmitted between the throttle body and the ECM on the signal/serial data circuit. The ECM decodes the serial data into a representation of voltage signals that are occurring in the throttle body. The information is then displayed on a scan tool as the voltage inputs from TP sensors 1 and 2.

P0121

  1. DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0335, or P0336 is not set.
  2. The engine speed is between 500-6,800 RPM.
  3. The engine coolant temperature (ECT) is -7 to +125°C (19-257°F).
  4. The intake air temperature (IAT) is -20 to +126°C (-4 to +259°F).
  5. The DTC runs continuously when the above conditions are met.

P0122, P0123, P0222, P0223

  1. DTC P06A3 is not set.
  2. The ignition is ON or the engine is running.
  3. The run/crank or powertrain relay voltage is greater than 6.41 V and reduced power is not active.
  4. The DTCs run continuously when the above condition are met.

P16A0, P16A1, or P16A2

  1. DTC P06A3 is not set.
  2. The ignition is ON or the engine is operating.
  3. The run/crank voltage is greater than 6.41 V.
  4. The DTCs run continuously once the above conditions are met for greater than 1 s.

P2135

  1. DTCs P0122, P0123, P0222, P0223, or P06A3 are not set.
  2. The ignition is ON or the engine is running.
  3. The run/crank or powertrain relay voltage is greater than 6.41 V and reduced power is not active.
  4. The DTC runs continuously when the above conditions are met.

P0121

The ECM detects that the throttle position sensor 1 voltage is stuck within normal operating range for greater than 1 s.

P0122

The ECM detects the throttle position sensor 1 signal voltage is less than 0.33 V for greater than 1 s.

P0123

The ECM detects the throttle position sensor 1 signal voltage is greater than 4.75 V for greater than 1 s.

P0222

The ECM detects the throttle position sensor 2 signal voltage is less than 0.25 V for greater than 1 s.

P0223

The ECM detects the throttle position sensor 2 signal voltage is greater than 4.59 V for greater than 1 s.

P16A0

The ECM detects a low voltage circuit condition on the throttle position sensor signal circuit for greater than 1 s.

P16A1

The ECM detects a high voltage circuit condition on the throttle position sensor signal circuit for greater than 1 s.

P16A2

The ECM detects an incorrect message was received over the throttle position sensor signal circuit for greater than 1 s.

P2135

  1. The ECM detects that throttle position sensors 1 and 2 disagree greater than 7-10 percent for greater than 1 s. OR
  2. The ECM detects that the TP sensor 1 and 2 learned minimum throttle position is greater than 5 percent of the 5 volt reference voltage.
  1. DTCs P0121 is a Type B DTC.
  2. DTCs P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, and P2135 are Type A DTCs.
  3. The ECM commands the throttle actuator control (TAC) system to operate in a Reduced Engine Power mode.
  4. A message center or an indicator displays Reduced Engine Power.
  5. Under certain conditions, the ECM commands the engine OFF.
  1. DTCs P0121 is a Type B DTC.
  2. DTCs P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, and P2135 are Type A DTCs.
  1. A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC to set.
  2. If the accelerator pedal is pressed to the wide open throttle position, the throttle blade angle or Throttle Position angle is limited to less than 40 percent.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON
  2. Verify that DTC P0601-P0606, P06A3, and P16F3 is not set. If a DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If a DTC is not set
  3. Verify the scan tool Throttle Body Idle Air flow Compensation parameter is less than 90 %. If 90 % or greater Refer to «Throttle Body Cleaning»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions__throttle-body-cleaning) . If less than 90 %
  4. Verify that DTC P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, or P2135 are not set. If DTC P0122, P0123, P0222, P0223, or P2135 are the only DTCs set Replace the Q38 Throttle Body. If DTC P16A0, P16A1, or P16A2 is set with any of the DTCs Refer to Circuit/System Testing If none of the DTCs are set
  5. Verify the Throttle Position Sensors 1 and 2 parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Agree is not displayed Test or replace the Q38 Throttle Body Assembly. If Agree is displayed
  6. Verify DTC P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, and P2135 is not set. If a DTC is set Refer to Circuit/System Testing. If a DTC is not set
  7. Determine the current vehicle testing altitude.
  8. Verify the scan tool MAP Sensor pressure parameter is within range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table. If the MAP Sensor pressure is not in range Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If the MAP Sensor pressure is within range
  9. Engine idling.
  10. Verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 psi) and changes with accelerator pedal input. If not between 26-52 kPa (3.8-7.5 psi) or does not change Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If between 26-52 kPa (3.8-7.5 psi) and changes
  11. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3,000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. If the MAF Sensor parameter does not change smoothly and gradually Refer to «DTC P0101»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If the MAF Sensor parameter changes smoothly and gradually
  12. Verify the scan tool Boost Pressure Sensor pressure and BARO parameters are within 3 kPa (0.4 psi) with engine at idle. If the parameters are not within 3 kPa (0.4 psi) Refer to «DTC P0236»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If the parameters are within 3 kPa (0.4 psi)
  13. Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 psi) during a WOT acceleration at the time of the 1-2 shift. If the parameters are not within 20 kPa (2.9 psi) Refer to «DTC P0236»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) If the parameters are within 20 kPa (2.9 psi)
  14. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  15. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  16. All OK.
  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at Q38 Throttle Body Assembly. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 5 ohms between the low reference circuit terminal 4 and ground. If 5 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 5 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  5. Ignition ON.
  6. Test for 4.8-5.2 V between the signal circuit terminal 3 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  7. Test or replace the Q38 Throttle Body Assembly.
  1. «Throttle Body Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Install any components that have been removed or replaced during diagnosis.
  2. Perform any adjustments, programming or setup procedures that are required when a component is removed or replaced.
  3. Clear the DTCs with a scan tool.
  4. Ignition OFF and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.
  5. Ignition ON.
  6. Verify the Throttle Position Sensors 1 and 2 parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Agree is not displayed Test or replace the Q38 Throttle Body Assembly. If Agree is displayed
  7. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not set. If DTC sets Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If DTC does not set
  8. All OK.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalP0117, P0119P0118, P0119P0118*,P0119P0119, P0128, P111E
Low ReferenceP0118, P0119P0128
*ECM or sensor damage may occur if the circuit is shorted to B+.
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: The Engine running Parameter Normal Range: Varies with engine coolant temperature, within a range of -39 to 149°C (-38 to 300°F)
Signal150°C (302°F)40°C (-40°F)40°C (-40°F)
Low Reference40°C (-40°F)40°C (-40°F)

ECT Sensor

The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 V to the ECT sensor signal circuit and a ground for the low reference circuit.

The purpose of this diagnostic is to analyze the performance of the thermostat by comparing the measured ECT to a modeled ECT using information from the following inputs

  1. ECT
  2. Engine load
  3. Intake air temperature (IAT)
  4. Mass air flow (MAF)
  5. Vehicle speed (VS)

The ECM uses the start-up ECT and ambient air temperature to begin the diagnostic calculation. This diagnostic monitors the amount of energy going into and out of the engine cooling system during the warm up process to determine if the ECT does increase normally and then maintains that temperature within a calibrated range of the modeled ECT.

  1. DTC P0102, P0103, P0111, P0112, P0113, P0114, P0117, P0118, P0119, P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, P0501 or P111E is not set.
  2. The start-up IAT is warmer than -7°C (+19°F).
  3. The start-up ECT is colder than 70°C (158°F), when the IAT is above 10°C (50°F). OR
  4. The start-up ECT is colder than 50°C (122°F), when the IAT is below 10°C (50°F).
  5. The Thermostat heater duty cycle does not exceed 20 % for greater than 5 s.
  6. The engine OFF time is greater than 30 min.
  7. The engine run time is between 30 s and 30 min.
  8. The fuel ethanol percentage is 87 % or less.
  9. The ignition voltage is greater than 10 V.
  10. This DTC runs once per ignition cycle when the above conditions are met.
  1. The ECM determines that the modeled ECT has met the calibrated target of 71° C (160 °F) and the measured ECT is less than 52° C (126° F) for greater than 1 s. OR
  2. The ECM determines that the modeled ECT has met the calibrated target of 55° C (131 °F) and the measured ECT is less than 20° C (68° F) for greater than 1 s.
  1. DTC P0128 is a Type B DTC.
  2. The Engine Coolant Temperature Gauge is inoperative.
  3. The cooling fans will be commanded ON.
  4. The AC compressor will be commanded OFF.

DTC P0128 is a Type B DTC.

  1. DTC P0128 occurring with insufficient vehicle interior heating is an indication of improper thermostat operation.
  2. Corrosion on the ECT sensor terminals or the ECT harness connector results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.
  3. A slight to moderate resistance in the ECT sensor signal circuit or low reference circuit will affect this diagnostic. This condition results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.
  4. DTC P0128 and DTC 2181 both currently failed could indicate a stuck open thermostat.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information.

  1. Verify the cooling system is filled to the correct coolant level. Refer to «Cooling System Leak Testing»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-leak-testing) , and «Cooling System Draining and Filling (Static Fill)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (GE 47716)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) . If the coolant level is not correct Repair as necessary. If the coolant level is correct
  2. Verify DTC P00B7, P0117, P0118, P0597, P0598, P0599, or P111E is not set. If a DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If a DTC is not set
  3. Engine running for 15 min with the A/C OFF, increase the engine speed to 3,000 RPM.
  4. Verify the scan tool ECT Sensor parameter is greater than 79°C (174°F) when commanding the Engine Coolant Thermostat Heater to 0%. If less than 79°C (174°F) Replace the E41 Engine Coolant Thermostat Heater. If greater than 79°C (174°F)
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Step 1. If the DTC does not set
  7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Engine Coolant Thermostat Housing Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) , «Engine Coolant Thermostat Housing Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
HO2S High SignalP0131, P0137P0132, P0134, P0138, P0140P0132, P0134, P0138, P0140, P2A00P0133, P013A, P013B, P013E, P013F, P015A, P015B
HO2S Low SignalP0131, P0137, P0171P0132, P0134, P0138, P0140P0132, P0134, P0138, P0140, P2A00P0133, P013A, P013B, P013E, P013F, P015A, P015B
CircuitShort to GroundOpenShort to Voltage
Parameter Normal Range: 200-800 mV
HO2S High Signal0.00 V1.7-2.1 V1.7-2.1 V
HO2S Low Signal0.00 V1.7-2.1 V1.7-2.1 V

HO2S Sensor 1 or 2

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,000 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1,000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

P0131 or P0137

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Ignition voltage is between 10-32 V.
  3. The fuel system is operating in Closed Loop.
  4. Device controls are not active.
  5. The fuel level is greater than 10 percent.
  6. The throttle position (TP) is between 3-70 percent.
  7. Ethanol content is less than 87 percent.
  8. Decel fuel cut-off is not active.
  9. The DTCs run continuously when the above conditions are met for 5 s.

P0132 or P0138

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Ignition voltage is between 10-32 V.
  3. The fuel system is operating in Closed Loop.
  4. Ethanol content is less than 87 percent.
  5. The fuel level is greater than 10 percent.
  6. The engine run time is greater than 20 s.
  7. The DTCs run continuously when the above conditions are met for 5 s.

P0134 or P0140

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Ignition voltage is between 10-32 V.
  3. The engine run time is greater than 150 s.
  4. The fuel system is in Closed Loop.
  5. Ethanol content is less than 87 percent.
  6. The DTCs run continuously when the above conditions are met.

P2A00

  1. DTCs P0068, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0131, P0132, P0151, P0152, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Ignition voltage is between 10-32 V.
  3. The engine run time is greater than 100 s.
  4. The engine speed is between 1,000-3,400 RPM.
  5. The engine air flow is between 4-30 g/s.
  6. The engine coolant temperature (ECT) is warmer than 65°C (149°F).
  7. Decel fuel cut-off is not active.
  8. DTC P2A00 runs continuously when the above conditions are met for 5 s.

P0131 or P0137

The engine control module detects that the heated oxygen sensor voltage is less than 50 mV and the circuit is shorted to ground for greater than 50 s.

P0132 or P0138

The engine control module detects that the heated oxygen sensor voltage is greater than 1,050 mV and the circuit is shorted to voltage for greater than 13 s.

P0134 or P0140

The engine control module detects that the heated oxygen sensor voltage is greater than 1.7 V and is an open circuit for greater than 50 s.

P2A00

The ECM detects that the Loop Status parameter is open for greater than 50 s.

DTCs P0131, P0132, P0134, P0137, P0138, P0140 and P2A00 are Type B DTCs.

DTCs P0131, P0132, P0134, P0137, P0138, P0140 and P2A00 are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify no HO2S heater DTCs are set. If a DTC is set. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If a DTC is not set.
  3. Engine running.
  4. Verify the scan tool HO2S Sensor 1 or 2 parameters are between 50-1,050 mV. If not between 50-1,050 mV. Refer to Circuit/System Testing. If between 50-1,050 mV.
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets. Refer to Circuit/System Testing. If the DTC does not set.
  7. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the appropriate B52 Heated Oxygen Sensor harness connector. It may take up to 2 minutes for all vehicle systems to power down. Ignition ON.
  2. Test for 1.7-3.0 V between the high signal circuit terminal 4 and ground. If less than 1.7 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the high signal circuit terminal 4 and ground. If less than infinite resistance repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the high signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 3.0 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the high signal circuit terminal 4 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 1.7-3.0 V
  3. Verify the scan tool HO2S sensor 1 or 2 parameter is between 1.7-2.1 V. If less than 1.7 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the low signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If between 1.7-2.1 V
  4. Connect a 3 A fused jumper wire between the high signal circuit terminal 4 and the low signal circuit terminal 3.
  5. Verify the scan tool HO2S sensor 1 or 2 parameter displays 0.0 V. If greater than 0.0 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 2 ohms in the low signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms Test for less than 1 V between the low signal circuit terminal 3 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If 0.0 V
  6. Verify none of the conditions listed below exist: Water intrusion in the B52 Heated Oxygen Sensor harness connector Low or high fuel system pressure-Refer to «Fuel System Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel that is contaminated-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel saturation of the evaporative emission (EVAP) canister Exhaust leaks Engine vacuum leaks If any of the conditions exist Repair as necessary. If none of the conditions exist Test or replace the B52 Heated Oxygen Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Heated Oxygen Sensor Replacement - Sensor 1 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Heated Oxygen Sensor Replacement - Sensor 1 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Heated Oxygen Sensor Replacement - Sensor 2 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Heated Oxygen Sensor Replacement - Sensor 2 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  3. Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing an HO2S.
  4. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
HO2S High SignalP0131, P0137P0132, P0134, P0138, P0140P0132, P0134, P0138, P0140P0133, P013A, P013B, P013E, P013F, P015A, P015B
HO2S Low SignalP0131, P0137P0132, P0134, P0138, P0140P0132, P0134, P0138, P0140P0133, P013A, P013B, P013E, P013F, P015A, P015B
CircuitShort to GroundOpenShort to Voltage
Parameter Normal Range: 200-800 mV
HO2S High Signal0.00 V1.7-2.1 V1.7-2.1 V
HO2S Low Signal0.00 V1.7-2.1 V1.7 - 2.1 V

HO2S 1 or 2

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,000 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1,000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

P0133

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0131, P0132, P0134, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0279, P0280, P0282, P0283, P0300-P0308, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P1104, P1248, P1249, P124A, P124B, P124C, P124D, P124E, P124F, P1516, P16F3, P2100-P2103, P2119, P2135, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, P217B, P217C, P217E, P217F, P2176, P2227-P2230 are not set.
  2. The Ignition voltage is between 10-32 V.
  3. The engine is OFF for greater 8 hours.
  4. The engine coolant temperature (ECT) is warmer than 70°C (158°F).
  5. The intake air temperature (IAT) is warmer than -40°C (-40°F)
  6. The fuel level is greater than 10%.
  7. The engine run time is greater than 120 s.
  8. The engine speed is between 1,000-3,500 RPM.
  9. The barometric (BARO) pressure is greater than 70 kPa.
  10. The mass airflow (MAF) is between 10-40 g/s.
  11. The fuel system is in Closed Loop.
  12. Device controls are not active.
  13. Ethanol content is less than 87%.
  14. Fuel control is not in power enrichment.
  15. Decel fuel cut-off is not active.
  16. The DTCs run once per drive cycle when the above conditions are met for 3 s.

P013A or P013E

  1. Before the ECM can report DTC P013A, or P013C failed, DTCs P013E, P014A, P2270, and P2272 must run and pass.
  2. Before the ECM can report DTC P013E, or P014A failed, DTCs P2270 and P2272 must run and pass.
  3. DTCs P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201-P0208, P0220, P0222, P0223, P0300-P0308, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271, P2A00 are not set.
  4. The Ignition voltage is between 10-32 V.
  5. The engine is OFF for greater 8 hours.
  6. The learned heater resistance is valid.
  7. The fuel level is greater than 10%.
  8. After the above conditions are met decel fuel cut-off continues without driver initiated pedal input.
  9. The DTCs run once per ignition cycle, during decel fuel cut-off (DFCO), when the above conditions are met.

P013B or P013F

  1. Before the ECM can report DTC P013B, or P013D failed, DTCs P013A, P013C, P013E, P013F, P014A, P014B, P2270, P2271, P2272, and P2273 must run and pass.
  2. Before the ECM can report DTC P013F, or P014B failed, DTCs P013A, P013C, P013E, P014A, P2270, P2271, P2272, and P2273 must run and pass.
  3. DTCs P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201-P0208, P0220, P0222, P0223, P0300-P0308, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271, P2A00 are not set.
  4. The Ignition voltage is between 10-32 V.
  5. The engine is OFF for greater 8 hours.
  6. The learned heater resistance is valid.
  7. The fuel level is greater than 10%.
  8. After the above conditions are met, fuel enrich mode is continued.
  9. The DTCs run once per ignition cycle when the above conditions are met.

P015A or P015B

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Ignition voltage is between 10-32 V.
  3. The engine is OFF for greater 8 hours.
  4. The engine coolant temperature (ECT) is warmer than 70°C (158°F).
  5. The intake air temperature (IAT) is warmer than -40°C (-40°F)
  6. The fuel level is greater than 10%.
  7. The engine run time is greater than 120 s.
  8. The engine speed is between 1,250-2,300 RPM.
  9. The vehicle speed is between 56-119 km/h (35-74 mph).
  10. The mass airflow (MAF) is between 3-12 g/s.
  11. The fuel system is in Closed Loop.
  12. Device controls are not active.
  13. The evaporative emission (EVAP) diagnostics are not in control of purge.
  14. The heated oxygen sensor 1 heater is on for greater than 40 s.
  15. The heated oxygen sensor 2 heater is on for greater than 175 s
  16. After the above conditions are met for 1 s the fuel mixture is forced rich.
  17. At the end of the forced rich fuel state, the heated oxygen sensor 1 is greater than 0.690 V and decel fuel cut-off is active.
  18. The DTCs run once per drive cycle when the above conditions are met.

P2270

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013A, P013B, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271 are not set.
  2. The system voltage is between 10-32 V.
  3. The fuel level is greater than 10%.
  4. The pedal position is less than 4%.
  5. The engine speed is between 1,250-2,300 RPM.
  6. The engine airflow is between 3-12 g/s.
  7. The vehicle speed is between 55-120 km/h (35-74 mph).
  8. The fuel state is in Closed Loop.
  9. The evaporative emission (EVAP) diagnostics are not in control of purge.
  10. The HO2S heaters are ON for more than 180 s.
  11. The predicted catalytic converter temperature is between 600-850°C (1,112-1,562°F).
  12. This DTC runs once per trip when all of the above conditions have been met for 1 s.

P2271

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013A, P013B, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270 are not set.
  2. The system voltage is between 10-32 V.
  3. The fuel level is greater than 10%.
  4. The engine speed is between 1,250-2,300 RPM.
  5. The engine airflow is between 3-12 g/s.
  6. The vehicle speed is between 55-120 km/h (34.2-74.6 mph).
  7. The fueling state is in Closed Loop.
  8. The evaporative emission (EVAP) diagnostics are not in control of purge.
  9. Power take-off is not active.
  10. The heated oxygen sensor heaters have been on more than 180 s.
  11. The predicted catalyst temperature is between 600-850°C (1,112-1,562°F).
  12. DTCs P013A, P013E, and P2270 have run and passed. THEN
  13. Decel fuel cut-off is active.
  14. The accelerator pedal position is stable.
  15. This DTC runs once per trip when the above conditions are met for 3 s.

P0133, P015A or P015B

  1. The engine control module detects that the heated oxygen sensor rich-to-lean or lean-to-rich average response time is greater than a calibrated value.
  2. The DTCs set within 60 s when the above condition is met.

P013A

The engine control module detects that the accumulated mass air flow monitored during rich-to-lean transitions between 450-150 mV is greater than 75 grams.

P013B

The engine control module detects that the accumulated mass air flow monitored during lean-to-rich transitions between 300-600 mV is greater than 75 grams.

P013E

The engine control module detects that the heated oxygen sensor voltage has not decreased below 450 mV within a calibrated value of accumulated air flow.

P013F

The engine control module detects that the heated oxygen sensor voltage has not increased above 300 mV within a calibrated value of accumulated air flow.

P2270

The engine control module does not detect a heated oxygen sensor voltage greater than 825 mV before accumulated mass air flow exceeds a calibrated value.

P2271

The engine control module does not detect an heated oxygen sensor voltage less than 100 mV before accumulated mass air flow exceeds a calibrated value.

  1. DTCs P0133, P013E, P013F, P2270, and P2271 are Type B DTCs.
  2. DTCs P013A, P013B, P015A, and P015B are Type A DTCs.
  1. DTCs P0133, P013E, P013F, P2270, and P2271 are Type B DTCs.
  2. DTCs P013A, P013B, P015A, and P015B are Type A DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify no HO2S heater DTCs are set. If a DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If a DTC is not set
  3. Verify none of the conditions listed below exist: Lean or rich fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Water intrusion in the HO2S harness connector Low or high fuel system pressure-Refer to «Fuel System Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel that is contaminated-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel saturation of the evaporative emission (EVAP) canister Exhaust leaks Engine vacuum leaks Engine oil consumption-Refer to «Oil Consumption Diagnosis»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures__oil-consumption-diagnosis) . Engine coolant consumption-Refer to «Loss of Coolant»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) . If any of the above conditions exist Repair as necessary. If any of the conditions exist
  4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  5. Verify the DTC does not reset. If the DTC sets Test or replace the appropriate B52 HO2S. If the DTC does not set
  6. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Heated Oxygen Sensor Replacement - Sensor 1 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Heated Oxygen Sensor Replacement - Sensor 1 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Heated Oxygen Sensor Replacement - Sensor 2 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) , «Heated Oxygen Sensor Replacement - Sensor 2 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  3. Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing an HO2S.
  4. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) controls a Closed Loop air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. The ECM monitors the heated oxygen sensor (HO2S) signal voltage, and adjusts the fuel delivery based on the signal voltage while in Closed Loop. A change made to the fuel delivery changes the long and short term fuel trim values. The short term fuel trim values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The long term fuel trim values change in response to trends in the short term fuel trim The long term fuel trim makes coarse adjustments to fueling in order to re-center and restore control to short term fuel trim. The ideal fuel trim values are around 0 %. A positive fuel trim value indicates that the ECM is adding fuel in order to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition.

  1. DTCs P0053, P0101, P0102, P0103, P0106, P0107, P0108, P0131-P0135, P0178, P0179, P0201-P0204, P0300-P0304, P0411, P0442, P0455, P0458, P0496, P0506, P0507, P1133, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P2227, P2228, P2229, P2230, P2269, P2440, P2444, or P2A00 are not set.
  2. The engine is in Closed Loop status.
  3. The catalyst monitor diagnostic intrusive test, post 02 diagnostic intrusive test, device control, and evaporative emission leak test are not active.
  4. The engine coolant temperature (ECT) is between -20 and +130°C (-4 and +266°F).
  5. The intake air temperature (IAT) is between -20 and +150°C (-4 and +302°F).
  6. The manifold absolute pressure (MAP) is between 15-255 kPa (2.2-37 psi).
  7. The engine speed is between 400-6,600 RPM.
  8. The mass air flow (MAF) is between 1-512 g/s.
  9. The barometric pressure (BARO) is greater than 70 kPa (10.2 psi).
  10. The fuel level is greater than 10 %.
  11. This diagnostic runs continuously when the above conditions have been met.
  1. The average long term fuel trim weighted average value is greater or less than a calibrated value.
  2. The above condition is present for approximately 3 min after the Conditions for Running the DTC have been met.

DTCs P0171 and P0172 are Type B DTCs.

DTCs P0171 and P0172 are Type B DTCs.

  1. Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S value should vary from approximately 40 mV to approximately 900 mV, and respond to fueling changes.
  2. The normal Short Term Fuel Trim and Long Term Fuel Trim parameters should be between +10 and -10 % with 0 % the optimum, with the engine running at operating temperature.
  3. It is very unlikely that an HO2S will cause this DTC to set without the occurrence of the circuit related HO2S DTCs. Do not replace an HO2S to address this DTC without first performing all the steps in Circuit/System Verification.
  4. Any un-metered air into the engine causes this DTC to set. Thoroughly inspect all areas of the engine for vacuum leaks.
  5. A MAF sensor condition can cause this DTC without setting a MAF DTC. If there is a MAF sensor condition, the MAF sensor parameters will appear to be within range.
  6. Inspect the air filter for being the correct one for this application. Make sure that the engine oil fill cap is in place and that it is tight. Verify that the engine oil dip stick is fully seated.
  7. Certain aftermarket air filters may cause a DTC to set.
  8. Certain aftermarket air induction systems or modifications to the air induction system may cause a DTC to set.
  9. Certain aftermarket exhaust system components may cause a DTC to set.

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify no other DTCs are set. If any other DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If no other DTCs are set
  3. Verify DTC P0171 or P0172 is not set. If a DTC is set Refer to Circuit/System Testing If no DTC is set
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
  5. Verify DTC P0171 or P0172 is not set. If any of the DTCs set Refer to Circuit/System Testing If none of the DTCs set
  6. All OK.
  1. Ignition ON.
  2. Verify the manifold absolute pressure sensor is within the range specified for your altitude. Refer to «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) If not within the specified range Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) If within the specified range
  3. Engine running, allow the engine to reach operating temperature.
  4. Verify the Long Term Fuel Trim parameter is between -22 % and +38.5 %. If not within the specified range, inspect for the conditions listed below: P0171 Mass air flow (MAF) sensor signal skewed-If the Short Term Fuel Trim parameter changes greater than 20 % when the MAF sensor is disconnected, refer to «DTC P0101»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Missing, restricted, or leaking exhaust components-Refer to «Symptoms - Engine Exhaust»(/cadillac/ats/i-2012-2014/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) . Malfunctioning fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Vacuum hoses for splits, kinks, and improper connections Insufficient fuel in the tank Low fuel pressure-Refer to «Fuel System Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings. Leaks in the air induction system and the air intake ducts Leaks in the components of the vacuum operated engine mount system Missing air filter element Cracked EVAP canister Evaporative pipes obstructed or leaking The crankcase ventilation system for leaks-Refer to «Crankcase Ventilation System Inspection/Diagnosis (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures__crankcase-ventilation-system-inspectiondiagnosis-lcv) , «Crankcase Ventilation System Inspection/Diagnosis (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures__crankcase-ventilation-system-inspectiondiagnosis-ltg) . P0172 Mass air flow (MAF) sensor signal skewed-If the Short Term Fuel Trim parameters for both banks changes greater than 20 % when the MAF sensor is disconnected, refer to «DTC P0101»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Missing, restricted, or leaking exhaust components-Refer to «Symptoms - Engine Exhaust»(/cadillac/ats/i-2012-2014/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) . Malfunctioning fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) Collapsed or restricted air intake duct Excessive fuel pressure - Refer to «Fuel System Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) Dirty or restricted air filter Objects blocking the throttle body Improper operation of the evaporative emissions control system Excessive fuel in the crankcase-Change the engine oil as necessary. If a condition is found Repair as necessary. If no condition is found
  5. Test the engine for a mechanical condition. Refer to «Symptoms - Engine Mechanical (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) , «Symptoms - Engine Mechanical (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP018C, P0641, P06A6P018CP018DP06A6
SignalP018CP018CP018DP018B
Low ReferenceP018DP06A6

The fuel pressure sensor is located on the fuel line. The fuel pressure sensor monitors the fuel pressure in the fuel line. The fuel pump control module monitors the voltage signal from the fuel pressure sensor.

  1. The engine is running.
  2. DTC P018C, P018D, P0231, P0232, P023F, P064A, P1255 or P06A6 are not active.
  3. DTC P0641 has not failed this ignition cycle.
  4. Fuel pump control is enabled and the fuel pump control state is normal.
  5. The engine has been running for at least 5 seconds.

The fuel pump control module does not detect a change in the fuel pressure of at least 30 kPa (4.4 psi) when the fuel pump is operating. The fuel pressure sensor performance diagnostic provides a means to detect fuel pressure sensor output that is stuck within the normal operating range of the sensor.

DTC P018B, P018C and P018D are Type A DTCs.

DTC P018B, P018C and P018D are Type A DTCs.

  1. Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.
  2. Verify that the fuel tank is not empty. Only perform this diagnostic if there is at least 2 gallons of fuel in the fuel tank. Clear the DTC, and start and run the engine. Verify that the DTC resets before proceeding with the circuit system testing. If the DTC does not reset, refer to diagnostic aids.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  3. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Engine running.
  2. Verify the scan tool Fuel Pressure Sensor Voltage parameter is between 0.2-4.8 V. If not between 0.2-4.8 V Refer to Circuit/System Testing. If between 0.2-4.8 V
  3. All OK.

Note. Verify that the fuel tank is not empty. Only perform this diagnostic if there is at least 2 gallons of fuel in the fuel tank. Clear the DTC, and start and run the engine. Verify that the DTC resets before proceeding with the circuit system testing. If the DTC does not reset, refer to diagnostic aids.

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B47 fuel pressure sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the K27 Fuel Pump Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K27 Fuel Pump Control Module. If less than 10 ohms
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K27 Fuel Pump Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K27 Fuel Pump Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K27 Fuel Pump Control Module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K27 Fuel Pump Control Module. If between 4.8-5.2 V
  5. Verify the scan tool Fuel Pressure Sensor Voltage parameter is less than 1 V. If 1 V or greater Ignition OFF, disconnect the harness connector at the K27 Fuel Pump Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 1 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K27 Fuel Pump Control Module. If less than 1 V
  6. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the 5 V reference circuit terminal 3, wait 15 seconds.
  7. Verify the scan tool Fuel Pressure Sensor Voltage parameter is greater than 4.8 V. If 4.8 V or less Ignition OFF, disconnect the harness connector at the K27 Fuel Pump Control Module. Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K27 Fuel Pump Control Module. If greater than 4.8 V
  8. Test or replace the B47 fuel pressure sensor.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for fuel pump control module replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V Reference VoltageP018C, P0192, P0340, P0365, P0452, P0506, P0522, P0532, P055C, P0641, P2227, P2228P0192P018D, P0193, P0453, P0523, P0533, P055D, P0641, P2227P0191
Fuel Rail Pressure Sensor SignalP0192, P0506P0192P0193P0191
Low ReferenceP0193, P0506P0191

The fuel rail fuel pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on the 5 V reference circuit and ground on the reference ground circuit. The ECM receives a varying signal voltage on the signal circuit. The ECM monitors the voltage on the fuel rail fuel pressure sensor circuits. When the fuel pressure is high, the signal voltage is high. When the fuel pressure is low, the signal voltage is low.

P0191 - Condition 1

  1. The engine is not cranking.
  2. The ignition voltage is greater than 11 V.
  3. The vehicle speed is less than or equal to 1 km/h (0.62 mph).
  4. The low side fuel pressure is greater than or equal to 250 kPa (36 psi).
  5. The Accelerator Pedal Position is 0 percent for 2.5 s.
  6. The engine is running for greater than 30 s.

P0191 - Condition 2 and 3

  1. The engine is not cranking.
  2. The ignition voltage is greater than 11 V.
  3. The engine speed is between 1,000-3,000 RPM.
  4. The vehicle speed is greater than or equal to 35 km/h (22 mph).
  5. The low side fuel pressure is greater than or equal to 250 kPa (36 psi).
  6. The Desired Fuel Rail Pressure is between 4-6 MPa (580-870 psi).
  7. The Accelerator Pedal Position is greater than or equal to 10 percent.
  8. The engine is running for greater than 30 s.

P0191 - Condition 4

  1. DTC P0016, P0017, P0090, P0091, P0092, P00C8, P00C9, P00CA, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0122, P0123, P0128, P0192, P0193, P0201, P0202, P0203, P0204, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0300, P0301, P0302, P0303, P0304, P0335, P0336, P0340, P0341, P0351-P0354, P0365, P0366, P0506, P0507, P0628, P0697, P06A3, P0722, P0723, P1248, P1249, P124A, P124B, P1682, P2122, P2123, P2127, P2128, P2135, P2138, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157 is not set.
  2. The engine is not cranking.
  3. The vehicle speed is greater than or equal to 30 km/h (18.64 mph).
  4. The engine speed is greater than or equal to 2,000 RPM.
  5. The barometric (BARO) pressure is greater than 70 kPa.
  6. The intake air temperature (IAT) is warmer than -20°C (-4°F).

P0192 or P0193

  1. The engine is running.
  2. The ignition voltage is greater than 11 V.
  3. The DTCs run continuously within the enabling conditions.

P0191 - Condition 1

The difference between the low side fuel pressure and the high side fuel pressure is less than or equal to -1 MPa (-145 psi) or greater than or equal to 1 MPa (145 psi) with the high pressure fuel pump actuator commanded OFF. The condition exists for greater than 3 s.

P0191 - Condition 2

The difference between the relief pressure and the measured high pressure is less than or equal to -1.6 MPa (-232 psi) with the high pressure fuel pump actuator commanded ON. The condition exists for greater than 2 s.

P0191 - Condition 3

The difference between the commanded high pressure and the measured high pressure is greater than or equal to 3 MPa (435 psi) and the modeled injection pressure is greater than or equal to 1.6 MPa (232 psi) with the high pressure fuel pump actuator commanded ON. The condition exists for greater than 3 s.

P0191 - Condition 4

The difference between the measured maximum high pressure and the measured minimum high pressure is less than or equal to 0.1 MPa (14.5 psi) with the high pressure fuel pump actuator commanded ON. The condition exists for greater than 30 s with the engine running or greater than 10 s with the engine cranking.

P0192

The ECM detects that the fuel rail fuel pressure sensor signal voltage is low for greater than 5 s.

P0193

The ECM detects that the fuel rail fuel pressure sensor signal voltage is high for greater than 5 s.

  1. DTCs P0191, P0192, and P0193 are Type A DTCs.
  2. A message center or an indicator may display Reduced Engine Power.

DTCs P0191, P0192 and P0193 are Type A DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify DTC P0641 is not set. If the DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If the DTC is not set
  3. Engine idling.
  4. Verify DTC P0191, P0192 or P0193 is not set. If any of the DTCs are set Refer to Circuit/System Testing. If none of the DTCs are set
  5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the fuel injector multi-way harness connector X160. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the low reference circuit terminal 5 and ground. If 5 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 11 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  5. Verify the scan tool Fuel Rail Pressure Sensor voltage parameter is less than 0.02 V. If 0.02 V or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 12 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If less than 0.02 V
  6. Install a 3 A fused jumper wire between the signal circuit terminal 12 and the 5 V reference circuit terminal 11.
  7. Verify the scan tool Fuel Rail Pressure Sensor voltage parameter is greater than 4.96 V. If 4.96 V or less Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit terminal 12 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 4.96 V
  8. Ignition OFF, remove the intake manifold.
  9. Connect the fuel injector multi-way harness connector X160.
  10. Disconnect the B47B fuel rail fuel pressure sensor connector.
  11. Test for less than 5 ohms between the low reference circuit terminal 3 and ground. If 5 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
  12. Ignition ON.
  13. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  14. Ignition ON.
  15. Verify the scan tool Fuel Rail Pressure Sensor voltage parameter is less than 0.02 V. If 0.02 V or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 12 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If less than 0.02 V
  16. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 V reference circuit terminal 1.
  17. Verify the scan tool Fuel Rail Pressure Sensor voltage parameter is greater than 4.96 V. If 4.96 V or less Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit terminal and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 4.96 V
  18. Replace the B47B fuel rail fuel pressure sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageShort from Supply Circuit to Control Circuit
Direct Fuel Injector High Voltage Supply Cylinder 1P2147P0201P2148P1248
Direct Fuel Injector High Voltage Control Cylinder 1P0261P0201P2148P1248
Direct Fuel Injector High Voltage Supply Cylinder 2P2150P0202P2151P1249
Direct Fuel Injector High Voltage Control Cylinder 2P0264P0202P2151P1249
Direct Fuel Injector High Voltage Supply Cylinder 3P2153P0203P2154P124A
Direct Fuel Injector High Voltage Control Cylinder 3P0267P0203P2154P124A
Direct Fuel Injector High Voltage Supply Cylinder 4P2156P0204P2157P124B
Direct Fuel Injector High Voltage Control Cylinder 4P0270P0204P2157P124B

The engine control module (ECM) supplies voltage to each fuel injector on the injector high voltage supply circuits. The ECM energizes each fuel injector by grounding the high voltage control circuit of the fuel injector. The ECM monitors the status of the injector high voltage supply circuits and the fuel injector high voltage control circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled.

  1. DTC P062B is not set.
  2. The engine is running for greater than 5 s.
  3. The ignition voltage is greater than 11 V.
  4. The DTCs run continuously once the above conditions are met.

P0201, P0202, P0203, or P0204

The ECM detects the injector high voltage supply circuit or the injector high voltage control circuit is open for greater than 1 s.

P0261, P0264, P0267, or P0270

The ECM detects the injector high voltage control circuit is shorted to ground for greater than 1 s.

P0262, P0265, P0268, or P0271

The ECM detects the injector high voltage control circuit is shorted to voltage for greater than 1 s.

P1248, P1249, P124A, or P124B

The ECM detects the injector high voltage supply circuit is shorted to the injector high voltage control circuit for greater than 1 s.

P2147, P2150, P2153, or P2156

The ECM detects the injector high voltage supply circuit is shorted to ground for greater than 1 s.

P2148, P2151, P2154, or P2157

The ECM detects the injector high voltage supply circuit is shorted to voltage for greater than 1 s.

DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, and P2157 are Type A DTCs.

DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, and P2157 are Type A DTCs.

  1. Performing the fuel injector coil test may help isolate an intermittent condition. Refer to «Fuel Injector Solenoid Coil Test»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) .
  2. If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool Injector Control Circuit Status parameters. An Injector Control Circuit Status parameter will change from OK or Not Run to Malfunction if there is a condition with the circuit or a connection.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify DTC P0685 or P1682 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If none of the DTCs are set
  3. Verify DTC P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, or P2157 is not set. If any of the DTCs are set Refer to Circuit/System Testing If none of the DTCs are set
  4. Engine running.
  5. Verify the scan tool Cylinder 1-4 Current Misfire Counter parameters are not incrementing. If the Cylinder 1-4 Current Misfire Counters are incrementing Refer to Circuit/System Testing If the Cylinder 1-4 Current Misfire Counters are not incrementing
  6. Verify the scan tool Cylinder 1-4 Injector Control Circuit Status parameters display OK. If any parameters do not display OK Refer to Circuit/System Testing. If all parameters display OK
  7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  8. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing If the DTC does not set
  9. All OK.
  1. Ignition OFF, disconnect the fuel injector multi-way harness connector X160, ignition ON.
  2. Verify the scan tool Cylinder 1-4 Injector Control Circuit Status parameters display Open. If Open is not displayed Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module. Test for infinite resistance between the appropriate high voltage supply circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Ignition ON. Test for less than 1 V between the high voltage control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If Open is displayed
  3. Ignition ON, connect a test lamp between the appropriate high voltage supply circuit and the high voltage control circuit.
  4. Verify the scan tool Injector Control Circuit Status transitions from Open to OK. If the parameter does not transition Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the high voltage supply circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms Test for less than 2 ohms in the high voltage control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms Test for infinite resistance between the high voltage control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 1 V between the high voltage supply circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If the parameter transitions
  5. Ignition OFF.
  6. Test for 1.5-3 ohms between the high voltage supply circuit and high voltage control circuit. If less than 1.5 ohms Test for infinite resistance between the appropriate high voltage supply circuit or high voltage control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test the Q17 Fuel Injector for a short and replace as necessary. If greater than 3 ohms Disconnect the harness connector at the Q17 Fuel Injector. Test for less than 2 ohms in the high voltage supply circuit or high voltage control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the Q17 Fuel Injector. If between 1.5-3 ohms
  7. Test or replace the Q17 Fuel Injectors.
  1. «Fuel Injector Solenoid Coil Test»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures)
  2. «Fuel Injector Balance Test»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Fuel Injector Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions__fuel-injector-replacement)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
ControlP0231P023FP0232P023F, P2635
Low ReferenceP023FP023F, P2635

The engine control module (ECM) supplies voltage to the fuel pump control module when the ECM detects that the ignition is on. The voltage from the ECM to the fuel pump control module remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the fuel pump control module supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel line pressure.

P0231, P023F

The ignition voltage is between 9-18 V.

P0232

The control enable voltage signal supplied for the ECM to fuel pump control module is inactive for 4 seconds after engine has been shut off.

The fuel pump control module detects a fault on the fuel pump voltage circuit that is less than 11 V or greater than 18 V.

DTCs P0231, P0232, and P023F are Type A DTCs.

DTCs P0231, P0232, and P023F are Type A DTCs.

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

On vehicles equipped with a high pressure mechanical pump on direct fuel injection engines, the vehicle may continue to run even though the pump in the fuel tank is not operating.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A7 Fuel Pump and Level Sensor Assembly. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the K27 Fuel Pump Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K27 Fuel Pump Control Module. If less than 10 ohms
  3. Connect a test lamp between the control circuit terminal 1 and the low reference circuit terminal 2.
  4. Ignition ON.
  5. Verify the test lamp turns ON and OFF when commanding the Fuel Pump On and Off using the scan tool ECM fuel pump enable control function. If the test lamp is always OFF Ignition OFF, disconnect the harness connector at the K27 Fuel Pump Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K27 Fuel Pump Control Module. If the test lamp is always ON Ignition OFF, disconnect the harness connector at the K27 Fuel Pump Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K27 Fuel Pump Control Module. If the test lamp turns ON and OFF
  6. Replace the A7 Fuel Pump and Level Sensor Assembly.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Fuel Tank Fuel Pump Module Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions__fuel-tank-fuel-pump-module-replacement)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for fuel pump control module replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The boost pressure sensor is integrated with the intake air temperature (IAT) sensor 3. The boost pressure sensor measures the range of pressures between the turbocharger and the throttle body. The sensor used on this engine is a three atmosphere sensor. Pressure in this portion of the induction system is affected by engine speed, throttle opening, turbocharger boost pressure, IAT, barometric pressure (BARO), and the efficiency of the charge air cooler.

The sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes, on the boost pressure signal circuit. Under normal operation the greatest pressure that can exist in this portion of the induction system at ignition On, engine Off is equal to the BARO. When the vehicle is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa (34.8 psi). The lowest pressure that occurs is when the vehicle is idling or decelerating, and it is equal to BARO.

  1. DTC P0010, P0011, P0013, P0014, P0016, P0017, P0033, P0034, P0035, P0068, P00C8, P00C9, P0111, P0112, P0113, P0114, P0116, P0122, P0123, P0128, P0222, P0223, P0236, P0237, P0238, P0243, P0245, P0246, P0601, P0604, P0606, P1682, P16A0, P16A1, P16F3, P2101, P2176, P2227, P2228, P2229, P2230 or P2261 is not set.
  2. The driver requested boost pressure level exceeds the level of the base boost pressure.
  3. The engine speed is between 1,600-6,000 RPM.
  4. The desired boost pressure is between 140-300 kPa (20.3-43.5 psi)
  5. The Barometric Pressure (BARO) is between 60-120 kPa (8.7-17.4 psi).
  6. The Engine Coolant Temperature (ECT) is between -40 to +120°C (-40 to +248°F).
  7. The Intake Air Temperature (IAT) is between -40 to +80°C (-40 to +176°F)
  8. The turbocharger wastegate is not under output device control.
  9. The turbocharger bypass valve is not under output device control.
  10. The DTCs run continuously when the above conditions have been met.

P0234

The ECM detects that the actual boost pressure is greater than the desired boost pressure by a calibrated amount for greater than 3 s.

P0299

The ECM detects that the actual boost pressure is less than the desired boost pressure by a calibrated amount for greater than 3 s.

  1. DTCs P0234 and P0299 are Type B DTCs.
  2. The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.

DTCs P0234 and P0299 are Type B DTCs.

  1. The charge air cooler is connected to the turbocharger and to the throttle body by flexible duct work that requires the use of special high torque fastening clamps. These clamps cannot be substituted. In order to prevent any type of air leak when servicing the ductwork, the tightening specifications and proper positioning of the clamps is critical, and must be strictly adhered to.
  2. Use a solution of dish soap and water in a spray bottle to pinpoint any air leaks.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

GE-23738-A Vacuum Pump

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

  1. Ignition On.
  2. Verify DTC P0106, P0107, P0108, P0236, P0237, P0238, P0243, P0245, P0246, P2227, P2228, P2229, or P2230 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
  3. Verify the scan tool BARO Sensor parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table for the current testing altitude. If not within the range. Refer to «DTC P2227-P2230 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P2227-P2230 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . If within the range.
  4. Verify the scan tool MAP Sensor and BARO Sensor parameters are within 3 kPa (0.4 psi) . If not within 3 kPa (0.4 psi). Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If within 3 kPa (0.4 psi).
  5. Verify the scan tool Boost Pressure Sensor and BARO Sensor parameters are within 3 kPa (0.4 psi) . If not within 3 kPa (0.4 psi). Refer to «DTC P0236»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If within 3 kPa (0.4 psi).
  6. Verify a click is heard or felt from the Q40 Turbocharger Bypass Solenoid Valve when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool. If a click is not heard or felt Refer to «DTC P0033-P0035»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If a click is heard or felt
  7. Verify the parameters listed below do not display Malfunction when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool. Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status Turbocharger Bypass Solenoid Valve Control Circuit Open Test Status Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to «DTC P0033-P0035»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If Malfunction is not displayed
  8. Verify a series of clicks, which increase in frequency, are heard or felt from the Q42 Turbocharger Wastegate Solenoid Valve when commanding the Turbocharger Wastegate Solenoid Valve between 15-100 % with a scan tool. If a series of clicks in increasing frequency are not heard or felt Refer to «DTC P0243, P0245, or P0246»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If a series of clicks in increasing frequency is heard or felt
  9. Verify the parameters listed below do not display Malfunction when commanding the Turbocharger Wastegate Solenoid Valve between 15-100 % with a scan tool. Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status Turbocharger Wastegate Solenoid Valve Control Circuit Open Test Status Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to «DTC P0243, P0245, or P0246»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If Malfunction is not displayed
  10. Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 psi) during a WOT acceleration at the time of the 1-2 shift. If not within 20 kPa (2.9 psi) Refer to Circuit/System Testing. If within 20 kPa (2.9 psi)
  11. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  12. Verify a DTC does not set. If a DTC sets Refer to Circuit/System Testing If a DTC does not set
  13. All OK
  1. Verify the conditions listed below do not exist: Loose clamps, cracks or other damage in the air intake duct system Collapsed or restricted intake duct system Restricted air filter Any air flow restriction Any air leak between the turbocharger and the throttle body, including the charge air cooler assembly Splits, kinks or improper connections at the vacuum hoses Any vacuum leak Restricted, leaking or incorrect routing of hoses going to the components listed below: Q42 Turbocharger Wastegate Solenoid Valve Turbocharger wastegate actuator Turbocharger Missing, restricted or leaking exhaust components. Refer to «Symptoms - Engine Exhaust»(/cadillac/ats/i-2012-2014/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) . Exhaust leak between the turbocharger and the exhaust manifold Restricted or leaking turbocharger oil supply line Loose or incorrect installation of any components If a condition exists Repair or replace the affected component as necessary. If none of the conditions exist
  2. Ignition Off, disconnect the turbocharger wastegate solenoid valve supply hose at the turbocharger and apply 51 kPa (15 inches Hg) of vacuum to the hose with the GE 23738-A , ignition On.
  3. Verify the pressure decreases to 0 kPa (0 inches Hg) when commanding the Turbocharger Wastegate Solenoid Valve to 15 % with a scan tool. The pressure does not decrease to 0 kPa (0 inches Hg) Replace the Q42 Turbocharger Wastegate Solenoid Valve The pressure decreases to 0 kPa (0 inches Hg)
  4. Connect the turbocharger wastegate solenoid valve supply hose to the turbocharger.
  5. Disconnect the hose from the turbocharger wastegate actuator and connect the exhaust/pressure port of the GE 23738-A , or a suitable hand pressure pump, to the actuator.
  6. Verify the wastegate actuator rod moves when applying pressure to the actuator. If the actuator does not move Disconnect the wastegate actuator arm from the wastegate. Verify the wastegate actuator rod moves when applying pressure to the actuator. If the actuator does not move, replace the turbocharger wastegate actuator. If the actuator moves, replace the turbocharger. If the actuator moves
  7. Ignition Off, remove the Q40 Turbocharger Bypass Solenoid Valve from the turbocharger, ignition On.
  8. Verify the Q40 Turbocharger Bypass Solenoid Valve plunger retracts and extends when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool. The valve plunger does not retract and extend Replace the Q40 Turbocharger Bypass Solenoid Valve The valve plunger retracts and extends
  9. Verify the conditions listed below do not exist with the turbocharger assembly. Refer to «Turbocharger Cleaning and Inspection»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle) Cracked, damaged or worn turbine blades Restricted wastegate, turbine, ports or passages Foreign material A condition exists Repair or replace the turbocharger as necessary None of the conditions exist
  10. Replace the turbocharger.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Turbocharger Replacement»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-on-vehicle)
  2. «Turbocharger Bypass Valve Solenoid Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  3. «Turbocharger Wastegate Actuator Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  4. «Turbocharger Wastegate Regulator Solenoid Valve Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  5. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The boost pressure sensor is integrated with the turbocharger boost/intake air temperature sensor. The boost pressure sensor measures the range of pressures between the turbocharger and the throttle body. The sensor used on this engine is a three atmosphere sensor. Pressure in this portion of the induction system is affected by engine speed, throttle opening, turbocharger boost pressure, Intake air temperature (IAT), barometric pressure (BARO), and the efficiency of the charge air cooler.

The sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes. Under normal operation the greatest pressure that can exist in this portion of the induction system at ignition ON, engine OFF is equal to the BARO. When the engine is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa (34.8 psi). The pressure is equal to the BARO when the engine is idling or decelerating.

  1. DTC P0106, P0107, P0108, P0237, P0238, P2227, P2228, P2229, or P2230 is not set.
  2. DTC P0106, P0107, P0108, P0237, or P0238 is not pending.
  3. Ignition is ON.
  4. Engine is OFF.
  5. The time between current ignition cycle and the last time the engine was running is greater than 10 s.
  6. The DTC runs continuously when the above conditions have been met. OR
  7. DTC P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0128, P0237, P0238, P0335, P0336, P2227, P2228, P2229 or P2230 is not set.
  8. DTC P0112, P0113, P0117, or P0118 is not pending.
  9. Engine speed is between 400-6,000 RPM.
  10. Engine Coolant Temperature (ECT) is between -7 to +125°C (19.4-257°F).
  11. Intake Air Temperature (IAT) is between -20 to +125°C (-4 to +257°F).
  12. The DTC runs continuously when the above conditions have been met.
  1. The ECM detects that the boost pressure sensor signal is not within range of a model derived from engine speed, the BARO sensor, the MAF sensor, the MAP sensor, the throttle position sensor and the turbocharger boost pressure sensor when the engine is running. OR
  2. The ECM detects that the boost pressure sensor signal is less than 50 kPa (7.3 psi) or greater than 115 kPa (16.7 psi) when the ignition is ON and the engine is NOT rotating. OR
  3. The ECM detects that the difference between MAP and BARO is less than or equal to 10 kPa and the difference between turbocharger boost pressure and MAP is greater than 10 kPa and the difference between turbocharger boost pressure and BARO is greater than 10 kPa when the ignition is ON and the engine is NOT rotating.

DTC P0236 is a Type B DTC.

DTC P0236 is a Type B DTC.

  1. The charge air cooler is connected to the turbocharger and to the throttle body by flexible duct work that requires the use of special high torque fastening clamps. These clamps cannot be substituted. In order to prevent any type of air leak when servicing the duct work, the tightening specifications and proper positioning of the clamps is critical, and must be strictly adhered to.
  2. Use a smoke generating device or a solution of dish soap and water in a spray bottle to pinpoint any suspected air leaks in the induction system and in the charge air cooler assembly.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Verify that DTC P0641 is not set. If the DTC is set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM, LCV without turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P0641, P0651, P0697, or P06A3 (ECM, LTG with turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . If the DTC is not set
  2. If you were sent here from DTC P0068, P0101, P0106, P0121, or P1101 refer to Circuit/System Testing.
  3. Ignition ON.
  4. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90%. If 90% or greater Refer to «Throttle Body Cleaning»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions__throttle-body-cleaning) . If less than 90%
  5. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Disagree Refer to «DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) , «DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If Agree
  6. Verify the scan tool BARO parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table, for the current vehicle testing altitude. BARO is not in range Refer to «DTC P2227-P2230 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P2227-P2230 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . BARO is within range
  7. Verify the scan tool MAP Sensor pressure and BARO parameters are within 3 kPa (0.4 psi). The parameters are not within 3 kPa (0.4 psi). Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . The parameters are within 3 kPa (0.4 psi).
  8. Engine idling.
  9. Verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 psi) and changes with accelerator pedal input. If not between 26-52 kPa (3.8-7.5 psi) or does not change Refer to «DTC P0106»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If between 26-52 kPa (3.8-7.5 psi) and changes
  10. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3,000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. The MAF Sensor parameter does not change smoothly and gradually Refer to «DTC P0101»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . The MAF Sensor parameter changes smoothly and gradually
  11. Verify the scan tool Boost Pressure Sensor pressure and BARO parameters are within 3 kPa (0.4 psi). The parameters are not within 3 kPa (0.4 psi). Refer to Circuit/System Testing The parameters are within 3 kPa (0.4 psi).
  12. Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 psi) during a WOT acceleration at the time of the 1-2 shift. The parameters are not within 20 kPa (2.9 psi) Refer to Circuit/System Testing. The parameters are within 20 kPa (2.9 psi)
  13. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  14. Verify a DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  15. All OK.
  1. Verify that DTC P0237 or P0238 is not set. If a DTC is set Refer to «DTC P0237 or P0238»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If none of the DTCs are set
  2. Verify the conditions listed below do not exist: Loose clamps, cracks, or other damage in the air intake duct system Collapsed or restricted air intake duct system Restricted air filter Splits, kinks or improper connections at the vacuum hoses Missing, restricted or leaking exhaust components-Refer to «Symptoms - Engine Exhaust»(/cadillac/ats/i-2012-2014/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) . Vacuum leaks at the intake manifold and throttle body If a condition exists Repair as necessary. If none of the conditions exist
  3. Replace the B111B turbocharger boost/intake air temperature sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Intake Air Pressure and Temperature Sensor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for turbocharger boost/intake air temperature sensor replacement.
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP018C, P0192, P0236, P0237, P0340, P0365, P0452, P0532, P0641, P2227*P0236, P0237P018D, P0193, P0236, P0237, P0453, P0523, P0641, P2227*P0236
Intake Air Pressure SignalP0236, P0237, P2227P0236, P0237P0193, P0236, P0238, P0641, P2227*P0236
Low ReferenceP00EB, P0236, P0238, P2227
* A message center or an indicator may display ENGINE POWER IS REDUCED. Engine may experience Crank - NO Start condition.
CircuitShort to GroundOpenShort to Voltage
Parameter Normal Range: BARO to 240 kPa (34.8 psi) Operating Conditions: Engine running under various operating conditions
5 V Reference0 kPa (0 psi)0 kPa (0 psi)0 kPa (0 psi)
Boost Pressure Sensor0 kPa (0 psi)0 kPa (0 psi)392 kPa (56.9 psi)
Low Reference387 kPa (56.1 psi)

Boost Pressure Sensor

The boost pressure sensor is integrated with the turbocharger boost/intake air temperature sensor. The boost pressure sensor measures the range of pressures between the turbocharger and the throttle body. The sensor used on this engine is a three atmosphere sensor. Pressure in this portion of the induction system is affected by engine speed, throttle opening, turbocharger boost pressure, Intake air temperature (IAT), barometric pressure (BARO), and the efficiency of the charge air cooler.

The sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes. Under normal operation the greatest pressure that can exist in this portion of the induction system at ignition ON, engine OFF is equal to the BARO. When the engine is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa (34.8 psi). The pressure is equal to the BARO when the engine is idling or decelerating.

  1. Ignition is ON or the engine is running.
  2. The DTCs run continuously when the above conditions have been met.

P0237

The ECM detects that the boost pressure sensor voltage is less than 0.9 V for greater than 5 s .

P0238

The ECM detects that the boost pressure sensor voltage is greater than 3.9 V for greater than 5 s .

  1. DTCs P0237 and P0238 are Type B DTCs.
  2. The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.

DTCs P0237 and P0238 are Type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Verify that DTC P0641 is not set. If the DTC is set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM, LCV without turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P0641, P0651, P0697, or P06A3 (ECM, LTG with turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . If the DTC is not set
  2. Verify the scan tool BARO parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table, for the current vehicle testing altitude. BARO is not in range Refer to «DTC P2227-P2230 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P2227-P2230 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . BARO is within range
  3. Verify the scan tool Boost Pressure Sensor pressure and BARO parameters are within 3 kPa (0.4 psi) . The parameters are not within 3 kPa (0.4 psi). Refer to Circuit/System Testing The parameters are within 3 kPa (0.4 psi).
  4. Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 psi) during a WOT acceleration at the time of the 1-2 shift. The parameters are not within 20 kPa (2.9 psi) Refer to Circuit/System Testing. The parameters are within 20 kPa (2.9 psi)
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  6. Verify a DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the B111B turbocharger boost/intake air temperature sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the low reference circuit terminal 1 and ground. If 5 ohms or greater Ignition OFF, disconnect the X1 harness connector at the K20 engine control module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 engine control module. If less than 5 ohms
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground. If less than 4.8 V Ignition OFF, disconnect the X1 harness connector at the K20 engine control module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 engine control module. NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. If greater than 5.2 V Ignition OFF, disconnect the X1 harness connector at the K20 engine control module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 engine control module. If between 4.8-5.2 V
  5. Verify the scan tool Boost Pressure Sensor voltage parameter is less than 0.2 V. If 0.2 V or greater Ignition OFF, disconnect the X1 harness connector at the K20 engine control module, ignition ON. Test for less than 1 V between the signal circuit terminal 4 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 engine control module. If less than 0.2 V
  6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3.
  7. Verify the scan tool Boost Pressure Sensor voltage parameter is greater than 4.5 V. If 4.5 V or less Ignition OFF, disconnect the X1 harness connector at the K20 engine control module. Test for infinite resistance between the signal circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms, replace the K20 engine control module. If greater than 4.5 V
  8. Test or replace the B111B turbocharger boost/intake air temperature sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Intake Air Pressure and Temperature Sensor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for turbocharger boost/intake air temperature sensor replacement
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Ignition VoltageP0033, P0034, P0243, P0245, P0443, P06DA, P06DB*P0243P0243
Turbocharger Wastegate Solenoid ControlP0245P0243P0243P0246P0243
* Ignition fuse opens. A message center or an indicator may display ENGINE POWER IS REDUCED. Engine may experience NO Crank - NO Start condition.

The dual-scroll turbocharger incorporates a wastegate that is controlled by the engine control module (ECM) by means of a pulse width modulation (PWM) solenoid, to regulate the pressure ratio of the compressor. An ECM controlled compressor bypass valve is integrated into the unit to prevent compressor surging and damage from vibrations by opening during abrupt closed throttle conditions. The bypass valve is open during closed throttle deceleration conditions to allow air to recirculate in the turbocharger and maintain compressor speed.

As engine load and RPM increase, the turbocharger bypass valve is commanded closed by the ECM. As soon as the throttle closes, the valve is commanded open to allow the turbocharger air to recirculate to prevent compressor surging.

  1. Ignition is On or the engine is running.
  2. Battery voltage is between 11-32 V.
  3. The DTCs run continuously when the above conditions are met.

P0243

The ECM detects an open circuit on the turbocharger wastegate solenoid control circuit for greater than 2 s.

P0245

The ECM detects a short to ground on the turbocharger wastegate solenoid control circuit for greater than 2 s.

P0246

The ECM detects a short to voltage on the turbocharger wastegate solenoid control circuit for greater than 2 s.

  1. DTCs P0243, P0245, and P0246 are Type B DTCs.
  2. The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.

DTCs P0243, P0245, and P0246 are Type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition On
  2. Verify a series of clicks, which increase in frequency, are heard or felt from the Q42 Turbocharger Wastegate Solenoid Valve when commanding the Turbocharger Wastegate Solenoid Valve between 15-100 % with a scan tool. If a series of clicks in increasing frequency are not heard or felt Refer to Circuit/System Testing. If a series of clicks in increasing frequency is heard or felt
  3. Verify the parameters listed below do not display Malfunction when commanding the Turbocharger Wastegate Solenoid Valve between 15-100 % with a scan tool. Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status Turbocharger Wastegate Solenoid Valve Control Circuit Open Test Status Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  5. Verify a DTC does not set. If a DTC sets Refer to Circuit/System Testing If a DTC does not set
  6. All OK
  1. Ignition Off, disconnect the harness connector at the Q42 Turbocharger Wastegate Solenoid Valve, ignition On.
  2. Verify a test lamp illuminates between the ignition circuit terminal 1 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition Off. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition Off, remove the test lamp. NOTE: A short circuit in any component supplied by the fuse may cause the fuse to open and set a DTC when the component is activated. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test all components supplied by the fuse and replace as necessary. If the test lamp illuminates
  3. Verify that a test lamp does not illuminate between the control circuit terminal 2 and the ignition circuit terminal 1. If the test lamp illuminates Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If the test lamp does not illuminate
  4. Remove the test lamp.
  5. Verify the scan tool Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status parameter is OK when commanding the Turbocharger Wastegate Solenoid Valve between 15-100 % with a scan tool. If OK is not displayed Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If OK is displayed
  6. Install a 3 A fused jumper wire between the control circuit terminal 2 and the ignition circuit terminal 1.
  7. Verify the scan tool Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status parameter is Malfunction. If Malfunction is not displayed Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If Malfunction is displayed
  8. Test or replace the Q42 Turbocharger Wastegate Solenoid Valve.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Turbocharger Wastegate Regulator Solenoid Valve Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
ControlP025AP025AP025A

The engine control module (ECM) supplies voltage to the fuel pump control module when the ECM detects that the ignition is on. The voltage from the ECM to the fuel pump control module remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the fuel pump control module supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel line pressure.

The ignition is ON.

The serial data message from the ECM to the fuel pump control module does not agree with the state of the control enable voltage signal supplied from the ECM to the fuel pump control module for more than 2 seconds.

DTC P025A is a Type A DTC.

DTC P025A is a Type A DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Note. Verify that the fuel tank is not empty. Only perform this diagnostic if there is at least 2 gallons of fuel in the fuel tank. Clear the DTC, and start and run the engine. Verify that the DTC resets before proceeding with the circuit system testing. If the DTC does not reset, refer to diagnostic aids.

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K27 fuel pump control module, ignition ON.
  2. Connect a test lamp between the control circuit terminal 20 and ground.
  3. Verify the test lamp turns ON and OFF when commanding the fuel pump On and Off using the scan tool ECM fuel pump enable control function. If the test lamp is always OFF Ignition OFF, disconnect the harness connector at the K20 engine control module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 engine control module. If the test lamp is always ON Ignition OFF, disconnect the harness connector at the K20 engine control module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 engine control module. If the test lamp turns ON and OFF
  4. Test or replace the K27 fuel pump control module.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for ECM or fuel pump control module replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) uses information from the crankshaft position sensor and the camshaft position sensor to determine when a engine cylinder misfire is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM can detect individual cylinder misfire events.

Extreme cylinder misfire events can cause catalytic converter damage. The malfunction indicator lamp (MIL) will flash when the conditions for catalytic converter damage are present. DTCs P0301 through P0304 correspond to cylinders 1 through 4. When the ECM detects that a specific cylinder is misfiring, a DTC for the that cylinder will set and the corresponding fuel injector is disabled. The ECM will re-enable the fuel injector after 3 crankshaft revolutions if equipped with an automatic transmission or 6 crankshaft revolutions if equipped with a manual transmission to determine if the misfire is still present. If the misfire is still present, the ECM will disable the fuel injector again after 3 crankshaft revolutions if equipped with an automatic transmission or 6 crankshaft revolutions if equipped with a manual transmission repeating the process. If the misfire is not present, the fuel injector will remain enabled by the ECM.

  1. DTC P0010, P0011, P0013, P0014, P0016, P0017, P0068, P00C8, P00C9, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0117, P0118, P0119, P0122, P0123, P0191, P0192, P0193, P0222, P0223, P0335, P0336, P0340, P0341, P0365, P0366, P0601, P0604, P0606, P0651, P16A0, P16A1, P16A2, P16F3, P2101, P2135, P2227, P2228, P2229, or P2230 is not set.
  2. Greater than 2 crankshaft revolutions have occurred.
  3. The engine coolant temperature (ECT) is between -7 and +129°C (19-264°F).
  4. If the ECT is colder than -7°C (19°F) at start-up, this diagnostic will not run until the ECT is between 21-129°C (70-264°F).
  5. The battery voltage is between 9-32 V.
  6. The vehicle is not in a acceleration or deceleration condition.
  7. Engine speed is greater than 1400 RPM.
  8. Engine load is greater than 22%.
  9. Less than 180 misfire counts have occurred on one cylinder.
  10. Engine speed is greater than 1000 RPM and DTC P0315 is not set.
  11. The fuel level is at least 11%.
  12. The crankshaft position and camshaft position sensors are synchronized.
  13. The ECM is not in fuel cut-off or deceleration fuel cut-off mode.
  14. Active fuel management is in transition.
  15. The ECM is not detecting a rough road signal.

The DTCs run continuously when the above conditions are met.

P0300

The ECM detects a crankshaft rotation speed variation indicating a misfire rate sufficient to cause emissions levels to exceed a predetermined value or a misfire rate high enough to cause catalyst damage.

P0301, P0302, P0303, or P0304

The ECM detects a crankshaft rotation speed variation indicating a single cylinder misfire rate sufficient to cause emissions levels to exceed mandated standards.

  1. DTCs P0300-P0304 are Type B DTCs.
  2. The ECM will flash the malfunction indicator lamp (MIL) when a catalyst damaging level of misfire is present.

DTCs P0300-P0304 are Type B DTCs.

  1. A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect for the conditions listed below: A tire or wheel that is out of round or out of balance Variable thickness brake rotors An unbalanced drive shaft Certain rough road conditions Transmission operation A damaged or defective accessory drive component or belt
  2. Observe misfire counters after Active Fuel Management is commanded Off for a sticking lifter.
  3. High resistance in the circuits of the injectors may set a misfire DTC without setting an injector DTC. Test the injector circuits of the affected cylinder(s) for a high resistance if you suspect a condition.
  4. If the condition is intermittent, observing the scan tool IC Circuit Test and Fuel Injector Circuit Test Status parameters may help isolate the condition. The circuit test status parameters will change from OK or Not Run to Fault/Malfunction if a condition exists.
  5. A condition in the heated O2 sensor (HO2S) heater control circuits may set a DTC P0300.

Description and Operation

  1. «Electronic Ignition System Description»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-description-and-operation__electronic-ignition-system-description)
  2. «Fuel System Description»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-description-and-operation)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL26792 HEI Spark Tester

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

Note. Before starting the engine, review the freeze frame failure records data to determine if the misfire sets during a cold start or at operating temperature. If there is a cold start condition and the engine is started, the engine will need to be cooled down before the next attempt to start the engine within the fail conditions.

  1. Engine Running at normal operating temperature.
  2. Verify there is no abnormal engine noise. If abnormal engine noise is present Refer to «Symptoms - Engine Mechanical (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) , «Symptoms - Engine Mechanical (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) . If abnormal engine noise is not present
  3. Perform the scan tool «Crankshaft Position System Variation Learn»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions__crankshaft-position-system-variation-learn) procedure.
  4. Verify no DTCs are set. If any DTCs other than P0300-P0304 are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If DTC P0300-P0304 is set Refer to Circuit/System Testing. If no DTCs are set
  5. Verify the scan tool Cylinder 1-4 Current Misfire Counter parameters do not increment. If increments Refer to Circuit/System Testing. If does not increment
  6. Engine Running, perform the Cylinder Power Balance Test with a scan tool.
  7. Verify the engine speed changes when each injector is disabled and then enabled. If engine speed does not change Refer to Circuit/System Testing. If engine speed does change
  8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  9. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  10. All OK.
  1. Verify none of the following conditions listed below exist: Damage, carbon tracking, or fluid intrusion of the spark plug boots and/or spark plugs Vacuum hose splits, kinks, and incorrect connections Engine vacuum leaks Crankcase ventilation system for vacuum leaks Fuel pressure that is too low or too high. Refer to «Fuel System Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Contaminated fuel. Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . Exhaust system restrictions If a condition exists Repair or replace as necessary. If no conditions exist
  2. Ignition OFF, remove the appropriate T 8 Ignition Coil from the spark plug and connect the EL 26792 HEI Spark Tester to the spark plug boot, engine Cranking.
  3. Verify the spark output. If no output or the output is weak Refer to «Electronic Ignition System Diagnosis»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . If the output is good
  4. Ignition OFF.
  5. Verify the conditions listed below. Refer to «Ignition System Specifications»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__ignition-system-specifications) . The correct spark plug type The correct spark plug gap The correct spark plug torque If a condition exists Repair or replace as necessary. If no conditions exist
  6. Exchange the suspect spark plug with another cylinder that is operating correctly.
  7. Engine Running.
  8. Verify the scan tool Cylinder 1-4 Current Misfire Counter does not increment for the cylinder where the suspect spark plug was installed. If increments Replace the spark plug. If does not increment
  9. Test or inspect for the conditions listed below: A lean or rich Q17 Fuel Injector-Refer to «Fuel Injector Balance Test»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . An engine mechanical condition-Refer to «Symptoms - Engine Mechanical (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) , «Symptoms - Engine Mechanical (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) .
  1. «Ignition Coil Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Spark Plug Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  1. Install any components or connectors that have been removed or replaced during diagnosis.
  2. Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced.
  3. Clear the DTCs.
  4. Turn OFF the ignition for 60 s.
  5. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) and perform the appropriate diagnostic procedure.
  6. Engine Running, verify the scan tool Cylinder 1-4 Current Misfire Counter parameters do not increment. If the misfire counter parameters increment, a misfire condition still exists.
  7. To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair Verification for DTC P0420. Refer to «DTC P0420 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P0420 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The crankshaft position variation learn feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the crankshaft position sensor. The calculated error allows the engine control module (ECM) to accurately compensate for reference period variations. This enhances the ability of the ECM to detect misfire events over a wider range of engine speed and load conditions.

The crankshaft position system variation compensating values are stored in ECM memory after a learn procedure has been performed and the ignition switch is turned to the OFF position for at least 30 s. If the actual variation is not within the crankshaft position system variation compensating values stored in the ECM, DTC P0300 may set.

If the crankshaft position system variation values are not stored in the ECM memory or a proper ECM power down does not occur after completing the Crankshaft Position Learn Procedure, DTC P0315 sets.

Engine is Running.

The DTC runs continuously when the above condition is met.

The ECM detects that the crankshaft position system variation values are not stored in memory.

DTC P0315 is a Type A DTC.

DTC P0315 is a Type A DTC.

This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Perform the scan tool «Crankshaft Position System Variation Learn»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions__crankshaft-position-system-variation-learn) procedure.
  2. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
  3. Verify the DTC is not set. If the DTC sets Replace the K20 Engine Control Module. If the DTC does not set
  4. All OK

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for engine control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Knock Sensor 1 High SignalP0327, P06B6P0325P0328P0324*, P0326**
Knock Sensor 2 High SignalP0332, P06B7P0330P0333P0324*, P0331**
Knock Sensor 1 Low SignalP0327P0325P0328P0324*, P0326**
Knock Sensor 2 Low SignalP0332P0330P0333P0324*, P0331**
* Signal Performance High ** Signal Performance Low

The knock sensors enable the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The knock sensors produce an alternating current (AC) voltage signal that varies depending on the vibration level during engine operation. The ECM adjusts the spark timing based on the amplitude and the frequency of the two knock sensor signals. The ECM receives each knock sensor signal through a dedicated circuit. The ECM learns a minimum knock sensor noise level for all of the engine speed ranges and monitors the normal knock sensor signal. The ECM monitors the internal knock sensor processor test circuits which perform the open circuit diagnostic.

P0324

  1. Engine is running for 2 s or greater.
  2. Engine speed is 8,500 RPM or less.
  3. Engine air flow is between 0-2000 mg per cylinder.
  4. The engine coolant temperature (ECT) is -40°C (-40°F) or warmer.
  5. The intake air temperature (IAT) sensor is -40°C (-40°F) or warmer. AND
  6. Engine speed is 550 RPM or greater for 300 or more cumulative revolutions. OR
  7. Engine speed is 8500 RPM or greater for 400 or more cumulative revolutions.

P0326 and P0331

  1. Engine is running for 2 s or greater.
  2. Engine speed is 8,500 RPM or less.
  3. Engine air flow is between 20-2000 mg per cylinder.
  4. The engine coolant temperature (ECT) is -40°C (-40°F) or warmer.
  5. The intake air temperature (IAT) sensor is -40°C (-40°F) or warmer. AND
  6. Engine speed is 500 RPM or greater for 200 or more cumulative revolutions. OR
  7. Engine speed is 2000 RPM or greater for 200 or more cumulative revolutions. OR
  8. Engine speed is 8500 RPM or greater for 200 or more cumulative revolutions.

P06B6 and P06B7

  1. Engine is running for 2 s or greater.
  2. Engine speed is between 500-8,000 RPM for 200 or more cumulative revolutions.
  3. Engine air flow is between 0-2000 mg per cylinder.

The DTCs run continuously when the above conditions are met.

P0324

The ECM detects that either knock sensor signal performance is out of the normal calibrated range due to excessive engine knock on a per cylinder basis.

P0326

The ECM detects that the knock sensor 1 signal performance is out of the normal calibrated range due to a low signal level.

P0331

The ECM detects that the knock sensor 2 signal performance is out of the normal calibrated range due to a low signal level.

P06B6 and P06B7

The ECM has detected a fault in the knock sensor processor open circuit diagnostic internal test circuit.

  1. DTCs P0324, P0326, P0331, P06B6, and P06B7 are Type B DTCs.
  2. The ignition timing is retarded to reduce the potential of engine damaging spark knock.

DTCs P0324, P0326, P0331, P06B6, and P06B7 are Type B DTCs.

Description and Operation

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Engine Running.
  2. Verify DTC P0325, P0327, P0328, P0330, P0332, P0333, P06B6, or P06B7 is not set. If DTC P0325, P0327, P0328, P0330, P0332, or P0333 is set with P06B6 or P06B7 Refer to «DTC P0325, P0327, P0328, P0330, P0332, or P0333»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0010-to-dtc-p0411) . If only DTC P06B6 or P06B7 is set Replace the K20 Engine Control Module. If none of the DTCs are set
  3. Ignition OFF.
  4. Verify none of the conditions listed below exist: B68 Knock Sensor or wiring harness damage. Incorrect B68 Knock Sensor installation. Refer to «Fastener Tightening Specifications»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__fastener-tightening-specifications) . B68 Knock Sensor and engine mounting surface burrs, casting flash, and foreign material. Close proximity of hoses, brackets, and engine wiring. Loose brackets. Loose or broken accessory drive belts, brackets, components. An engine mechanical condition. Refer to «Symptoms - Engine Mechanical (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) , «Symptoms - Engine Mechanical (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) . Contaminated or poor quality fuel. If a condition exists Repair or replace as necessary. If no conditions exist
  5. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. If the DTC sets Test or replace the appropriate B68 Knock Sensor. If the DTC does not set
  6. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Knock Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Knock Sensor 1 High SignalP0327, P06B6P0325P0328P0324*, P0326**
Knock Sensor 2 High SignalP0332, P06B7P0330P0333P0324*, P0331**
Knock Sensor 1 Low SignalP0327P0325P0328P0324*, P0326**
Knock Sensor 2 Low SignalP0332P0330P0333P0324*, P0331**
* Signal Performance High ** Signal Performance Low

The knock sensors enable the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The knock sensors produce an alternating current (AC) voltage signal that varies depending on the vibration level during engine operation. The ECM adjusts the spark timing based on the amplitude and the frequency of the two knock sensor signals. The ECM receives each knock sensor signal through a dedicated circuit. The ECM learns a minimum knock sensor noise level for all of the engine speed ranges and monitors the normal knock sensor signal. The ECM monitors the internal knock sensor processor test circuits which perform the open circuit diagnostic.

P0325 and P0330

  1. Engine is running for 2 s or greater.
  2. Engine speed is between 550-8,500 RPM for 200 or more cumulative revolutions.
  3. Engine air flow is between 20-2000 mg per cylinder.
  4. The engine coolant temperature (ECT) is -40°C (-40°F) or warmer.
  5. The intake air temperature (IAT) sensor is -40°C (-40°F) or warmer.

P0327, P0328, P0332, and P0333

Engine speed is less than 8,500 RPM.

The DTCs run continuously when the above conditions are met.

P0325

The ECM detects knock sensor 1 signal circuit is open.

P0327

The ECM detects knock sensor 1 signal circuit is shorted to ground.

P0328

The ECM detects knock sensor 1 signal circuit is shorted to voltage.

P0330

The ECM detects knock sensor 2 signal circuit is open.

P0332

The ECM detects knock sensor 2 signal circuit is shorted to ground.

P0333

The ECM detects knock sensor 2 signal circuit is shorted to voltage.

  1. DTCs P0325, P0327, P0328, P0330, P0332, and P0333 are Type B DTCs.
  2. The ignition timing is retarded to reduce the potential of engine damaging spark knock.

DTCs P0325, P0327, P0328, P0330, P0332, and P0333 are Type B DTCs.

The following conditions listed below may cause a knock sensor DTC to set

  1. Sensor damage.
  2. Knock sensor and engine mounting surface burrs, casting flash, and foreign material.
  3. Close proximity of hoses, brackets, and engine wiring.
  4. Loose brackets.
  5. Loose or broken accessory drive belts, brackets, components.
  6. An engine mechanical condition. Refer to «Symptoms - Engine Mechanical (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) , «Symptoms - Engine Mechanical (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-diagnostic-information-and-procedures) .

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Engine Running.
  2. Verify DTC P0325, P0327, P0328, P0330, P0332, or P0333, is not set. If the DTC is set Refer to Circuit/System Testing. If the DTC is not set
  3. Verify the appropriate B68 Knock Sensor mounting bolt is properly tightened. Refer to «Fastener Tightening Specifications»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__fastener-tightening-specifications) . If not tightened to the correct specification Repair a necessary. If tightened to the correct specification
  4. Verify the scan tool parameters listed below display No while moving the related harnesses and connectors of the B68 Knock Sensor. Cylinder 1 Knock Detected Cylinder 2 Knock Detected Cylinder 3 Knock Detected Cylinder 4 Knock Detected If No is not displayed Repair the wiring harness or connectors. If No is displayed
  5. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Ignition OFF, disconnect the harness connector at the B68 Knock Sensor, ignition ON.
  2. Test for 1-2 V between the low signal circuit terminal 2 or B and ground. If less than 1 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the low signal circuit terminal 2 or B and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance. Test for less than 2 ohms in the low signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the low signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 1-2 V
  3. Test for 2-4 V between the high signal circuit terminal 1 or A and ground. If less than 2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the high signal circuit terminal 1 or A and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance. Test for less than 2 ohms in the high signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 4 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the high signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 2-4 V
  4. Test or replace the B68 Knock Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Knock Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP0335, P0557, P057C, P0651, P118CP0335P0558, P0651, P118CP0336
SignalP0335, P0506P0335, P0506P0335P0336
Low ReferenceP0335, P0506P0336

The crankshaft position sensor circuits consist of an engine control module (ECM) supplied 5 V reference circuit, low reference circuit, and an output signal circuit. The crankshaft position sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 58-tooth reluctor wheel on the crankshaft. Each tooth on the reluctor wheel is spaced at 60-tooth spacing, with 2 missing teeth for the reference gap. The crankshaft position sensor produces an ON/OFF DC voltage of varying frequency, with 58 output pulses per crankshaft revolution. The frequency of the crankshaft position sensor output depends on the velocity of the crankshaft. The crankshaft position sensor sends a digital signal, which represents an image of the crankshaft reluctor wheel, to the ECM as each tooth on the wheel rotates past the crankshaft position sensor. The ECM uses each crankshaft position signal pulse to determine crankshaft speed and decodes the crankshaft reluctor wheel reference gap to identify crankshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses crankshaft position sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and to detect cylinder misfire.

P0335 Condition 1

  1. The starter is engaged and the engine control module detects camshaft position sensor pulses. Or
  2. DTCs P0101, P0102 and P0103 are not set. And
  3. The airflow into the engine is greater than 3 g/s.

Condition 2

  1. The engine is running and the starter is not engaged.
  2. DTC P0651 is not set.

Condition 3

  1. The engine is running or the starter is engaged.
  2. DTCs P0365, P0366, P0641, and P0651 are not set.

P0336 Condition 1

  1. The airflow into the engine is greater than 3 g/s.
  2. Engine speed is greater than 450 RPM.
  3. DTCs P0335 or P0651 are not set.

Condition 2

  1. The engine is running and the starter is not engaged.
  2. DTC P0651 is not set.

Condition 3

  1. The starter is engaged and the engine control module detects camshaft position sensor pulses. Or
  2. DTCs P0101, P0102, and P0103 are not set.
  3. The airflow into the engine is greater than 3 g/s.

Condition 4

  1. The engine is running or the starter is engaged.
  2. DTCs P0365, P0366, P0641, and P0651, are not set.

The DTCs run continuously once the above conditions are met.

P0335 Condition 1

The ECM does not detect a crankshaft position sensor pulse for greater than 4 s.

Condition 2

The ECM does not detect a crankshaft position sensor pulse for greater than 1.0 s.

Condition 3

The ECM does not detect a crankshaft position sensor pulse for 2 out of 10 engine revolutions.

P0336 Condition 1

The ECM detects that 10 or more crankshaft resynchronization have occurred within 10.0 s.

Condition 2

The ECM does not detect the synchronization gap on the reluctor wheel for greater than 0.4 s.

Condition 3

The ECM does not detect the synchronization gap on the reluctor wheel for 1.5 s after the starter was engaged.

Condition 4

The ECM detects less than 51 or greater than 65 crankshaft position sensor pulses during 1 engine revolution for 8 out of 10 engine revolutions.

  1. DTCs P0335 and P0336 are Type B DTCs.
  2. The camshaft position sensor is used to determine engine position.
  3. The camshaft actuators are commanded to the parked position.

DTCs P0335 and P0336 are Type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify DTC P0651 is not set. If the DTC is set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM, LCV without turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P0641, P0651, P0697, or P06A3 (ECM, LTG with turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . If the DTC is not set
  3. Engine running.
  4. Verify the scan tool Crankshaft Position Active Counter parameter increments. If the counter does not increment Refer to Circuit/System Testing. If the counter increments
  5. Verify the scan tool Crankshaft Position Resync Counter parameter displays 0 counts and the engine does not stumble or stall while moving the related harness/connectors of the B26 Crankshaft Position Sensor. If greater than 0 counts and the engine stumbles or stalls Refer to Circuit/System Testing. If 0 counts and the engine does not stumble or stall
  6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  7. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  8. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B26 Crankshaft Position Sensor. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground. If 5 ohms or greater Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If 2 ohms or less, replace the K20 Engine Control Module. If less than 5 ohms
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms , replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the 5 V reference and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  5. Test for 4.8-5.2 V between the signal circuit terminal 3 and ground. If less than 4.8 V Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  6. Ignition OFF, connect a 3 A fused jumper wire to the signal circuit terminal 3, ignition ON.
  7. Verify the scan tool Crankshaft Position Sensor Active Counter parameter increments while rapidly tapping the fused jumper wire end to ground. If the counter does not increment Replace the K20 Engine Control Module. If the counter increments
  8. Verify DTC P0336 is not set. If the DTC is set Inspect for the conditions listed below: Excessive play or looseness of the B26 Crankshaft Position Sensor or the reluctor wheel Improper installation of the B26 Crankshaft Position Sensor Foreign material passing between the B26 Crankshaft Position Sensor and the reluctor wheel Damaged reluctor wheel Excessive air gap between the B26 Crankshaft Position Sensor and the reluctor wheel Engine oil for debris Timing chain, tensioner, and sprockets for wear or damage If any of the conditions above are found, repair as necessary. If all components test normal, test or replace the B26 Crankshaft Position Sensor. If the DTC is not set
  9. Test or replace the B26 Crankshaft Position Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Crankshaft Position Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP018C, P0192, P0452, P0522, P0532, P0641, P2227, P2228P0340, P0365P018D, P0193, P0453, P0523, P0641, P2227
SignalP0340, P0365P0340, P0365P0340, P0365P0341, P0366
Low ReferenceP0340, P0365P0340, P0365

The camshaft position sensors each have 3 circuits consisting of an engine control module (ECM) supplied 5 V reference circuit, low reference circuit, and an output signal circuit. The camshaft position sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past the camshaft position sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The sensor returns a digital ON/OFF DC voltage pulse of varying frequency with 4 varying width output pulses per camshaft revolution that represent an image of the camshaft reluctor wheel. The frequency of the camshaft position sensor output depends on the velocity of the camshaft. The ECM decodes the narrow and wide tooth pattern to identify camshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM uses the cylinder 1 exhaust camshaft position sensor to determine injector and ignition system synchronization. The intake and exhaust camshaft position sensors are also used to determine camshaft to crankshaft relationship. The ECM also uses camshaft position sensor output information to determine the camshaft relative position to the crankshaft to control camshaft phasing and limp-home operation.

P0340 or P0365 Condition 1

  1. DTCs P0101, P0102, and P0103 are not set.
  2. The airflow into the engine is greater than 3 g/s. OR
  3. The starter is engaged and the engine control module detects camshaft position sensor pulses.

Condition 2

  1. DTC P0651 is not set.
  2. The engine is running and the starter is not engaged.

Condition 3

  1. DTC P0335, P0336, P0641, or P0651 are not set.
  2. The crankshaft is synchronized.
  3. The starter is engaged.

Condition 4

  1. The crankshaft is synchronized.

P0341 or P0366 Condition 1

  1. DTC P0335, P0336, P0641, or P0651 are not set.
  2. The crankshaft is synchronized.
  3. The starter is engaged.

Condition 2

  1. DTC P0335, P0336, P0641, or P0651 are not set.
  2. The crankshaft is synchronized.

The DTCs run continuously once the above conditions are met.

P0340 or P0365 Condition 1

  1. The ECM does not detect a camshaft position sensor pulse for greater than 5.5 s. OR
  2. The ECM does not detect a camshaft position sensor pulse for greater than 4.0 s since the time the starter has been engaged.

Condition 2

The ECM detects less than 4 camshaft position sensor pulse for greater than 3.0 s.

Condition 3

The ECM does not detect a camshaft position sensor pulse during the first 2 engine revolutions.

Condition 4

The ECM does not detect a camshaft position sensor pulse during 200 engine revolutions.

P0341 or P0366 Condition 1

  1. The ECM detects less than 4 camshaft position sensor pulses during 2 engine revolutions. OR
  2. The ECM detects greater than 10 camshaft position sensor pulses during 2 engine revolutions.

Contion 2

The ECM detects less than 398 or greater than 402 camshaft position sensor pulses during 200 engine revolutions.

  1. DTCs P0340, P0341, P0365, and P0366 are Type B DTCs.
  2. The camshaft position actuator is commanded to the Home or Parked position.
  3. The ignition system defaults to a failed camshaft position sensor limp home mode.

DTCs P0340, P0341, P0365, and P0366 are Type B DTCs.

  1. With a DTC set, the engine may crank for an extended period of time at start-up
  2. The exhaust camshaft position sensor is used for injector and ignition system synchronization. A stalling condition will occur if the camshaft position sensor signal is intermittent and a DTC may not set. Inspect all camshaft position sensor circuits for poor connections.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify DTC P0641 or P0651 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM, LCV without turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P0641, P0651, P0697, or P06A3 (ECM, LTG with turbocharger)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . If none of the DTCs are set
  3. Engine running.
  4. Verify the scan tool parameters listed below increment: Exhaust Camshaft Position Active Counter Intake Camshaft Position Active Counter If any counter does not increment Refer to Circuit/System Testing. If all counters increment
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
  7. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate B23 Camshaft Position Sensor. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground. If 5 ohms or greater Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If 2 ohms or less, replace the K20 Engine Control Module. If less than 5 ohms
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance. Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms , replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  5. Test for 4.8-5.2 V between the signal circuit terminal 3 and ground. If less than 4.8 V Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
  6. Verify DTC P0341 or P0366 is not set. If any of the DTCs are set Inspect for the conditions listed below: Excessive play or looseness of the B23 Camshaft Position Sensor or the reluctor wheel Improper installation of the B23 Camshaft Position Sensor Foreign material passing between the B23 Camshaft Position Sensor and the reluctor wheel Damaged reluctor wheel Excessive air gap between the B23 Camshaft Position Sensor and the reluctor wheel Engine oil for debris Timing chain, tensioner, and sprockets for wear or damage If any of the conditions above are found, repair as necessary. If all components test normal, test or replace the B23 Camshaft Position Sensor. If none of the DTCs are set
  7. Test or replace the B23 Camshaft Position Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Camshaft Position Sensor Replacement - Exhaust»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Camshaft Position Sensor Replacement - Intake»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  3. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

These DTCs are used to verify that the crankshaft position has been detected correctly and to monitor the number of crankshaft reversals detected from the bi-directional crankshaft position sensor during an auto-start event.

P034A

  1. DTC P0335, P0336, or P0651 is not set.
  2. The engine has started rotating during an auto-start event.
  3. The crankshaft position is being verified.

The DTC runs each time the engine is started once the above conditions are met.

P034B

  1. DTC P0335, P0336, or P0651 is not set.
  2. Engine speed is between 400-2000 RPM.
  3. The airflow into the engine is greater than 3 g/s.
  4. The engine control module (ECM) detects crankshaft position sensor pulses.

The DTC runs continuously once the above conditions are met.

P034A

  1. The crankshaft position is incorrect by greater than 3 crankshaft reluctor wheel teeth during 2 out of 3 auto-start events.
  2. The crankshaft position is incorrect by at least 1 crankshaft reluctor wheel tooth during 4 out of 5 auto-start events.

P034B

The crankshaft position sensor detects more than 3 engine rotation reversals within less than 10 s.

DTC P034A and P034B are Type B DTCs.

DTC P034A and P034B are Type B DTCs.

These DTCs do not necessarily indicate there is a condition with the crankshaft position sensor or the engine control module (ECM).

DTC Type Reference

  1. Ignition ON.
  2. Verify DTC P0335, P0336, or P0651 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  4. Verify the DTC does not set. If the DTC sets Replace the B26 Crankshaft Position Sensor. If the DTC does not set
  5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ignition Voltage12, P0300
Ignition Coil 1 ControlP0300, P0351P0300, P0351P0300, P0351P0300, P0351
Ignition Coil 2 ControlP0300, P0352P0300, P0352P0300, P0352P0300, P0352
Ignition Coil 3 ControlP0300, P0353P0300, P0353P0300, P0353P0300, P0353
Ignition Coil 4 ControlP0300, P0354P0300, P0354P0300, P0354P0300, P0354
Low Reference
Ground3
1. The engine cranks but does not run and opens the fuse that supplies voltage to the ignition coils. 2. The engine cranks but does not run only when ignition voltage circuit to all coils is open 3. The engine may still run

The ignition system on this engine uses an individual coil for each cylinder. The engine control module (ECM) controls the spark event for each cylinder through the individual ignition coil control circuits. When the ECM commands the ignition control circuit ON, electrical current will flow through the primary winding of the ignition coil, creating a magnetic field. When a spark event is requested, the ECM will command the ignition control circuit OFF, interrupting current flow through the primary winding. The magnetic field created by the primary winding will collapse across the secondary coil windings, producing a high voltage across the spark plug electrodes. The ECM uses information from the crankshaft position sensor, and the camshaft position sensor for sequencing and timing of the spark events. The ECM monitors each ignition control circuit for improper voltage levels. Each ignition coil has the following electrical circuits

  1. An ignition voltage circuit
  2. A ground
  3. An IC control circuit
  4. A low reference circuit
  1. The engine is running.
  2. Ignition voltage is greater than 5 V.

The DTCs run continuously when the above conditions are met.

The engine control module detects that the voltage command state and the actual state of the control circuit do not match.

DTCs P0351, P0352, P0353, and P0354 are Type B DTCs.

DTCs P0351, P0352, P0353, and P0354 are Type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL 26792 HEI Spark Tester

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

  1. Engine running.
  2. Verify the parameters listed below do not display Malfunction: Ignition Coil 1-4 Control Circuit High Voltage Test Status Ignition Coil 1-4 Control Circuit Low Voltage Test Status Ignition Coil 1-4 Control Circuit Open Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  4. Verify DTC P0351-P0354 does not set. If any of the DTCs are set Refer to Circuit/System Testing. If none of the DTCs are set
  5. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate T8 Ignition Coil. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the ground circuit terminal 1 and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Test for less than 5 ohms between the low reference circuit terminal 2 and ground. If 5 ohms or greater Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
  4. Ignition ON.
  5. Verify a test lamp illuminates between the ignition circuit terminal 4 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open NOTE: The ignition circuit may supply voltage to other components. Make sure to test all circuits and components for a short to ground that share the ignition circuit. Ignition OFF, remove the test lamp and disconnect all components on the circuit. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Replace the fuse, ignition ON Verify the fuse is good after connecting each T 8 Ignition Coil and other components (if applicable) one at a time. If the fuse opens, replace the T 8 Ignition Coil or component (if applicable) that opens the fuse when connected. If the fuse is good, replace the K20 Engine Control Module. If the test lamp illuminates
  6. Engine Running.
  7. Verify the appropriate scan tool Ignition Coil Control Circuit Low Voltage Test Status does not display Malfunction. If Malfunction is displayed Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the control circuit. If infinite resistance, replace the K20 Engine Control Module. If Malfunction is not displayed
  8. Verify the appropriate scan tool Ignition Coil Control Circuit High Voltage Test Status does not display Malfunction. If Malfunction is displayed Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage in the circuit. If less than 1 V, replace the K20 Engine Control Module. If Malfunction is not displayed
  9. Ignition OFF, install a 3 A fused jumper wire between the control circuit terminal 3 and ground, engine Running.
  10. Verify the appropriate scan tool Ignition Coil Control Circuit Low Voltage Test Status displays Malfunction. If Malfunction is not displayed Ignition OFF, remove the fused jumper, and disconnect the X3 harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If Malfunction is displayed
  11. Test or replace the suspect T8 Ignition Coil.

Component Test

Note. You must perform the Circuit/System Testing before proceeding with Component Testing.

  1. Ignition OFF, connect the EL 26792 HEI Spark Tester to the appropriate T8 Ignition Coil.
  2. Engine running.
  3. Verify the spark output of the T8 Ignition Coil. If no output or the output is weak Replace the T8 Ignition Coil. If the output is normal
  4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Ignition Coil Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)
  2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The secondary air injection system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the exhaust stream in order to accelerate the catalyst operation. A pressure sensor in the shutoff/check valve is used to monitor the air flow from the secondary air injection pump. The engine control module (ECM) supplies voltage to the 5-volt reference circuit and supplies a ground to the low reference circuit. The sensor provides a signal voltage to the ECM relative to the pressure changes within the secondary air injection system.

Ignition voltage is supplied to the secondary air injection pump and air injection shutoff/check valve relays. The ECM controls the relays by grounding the control circuits, which activates the relays. When the relay contacts close, voltage is supplied to the pump and the valve, which turns the pump on and opens the valve.

The diagnostic uses 3 phases to test the secondary air injection system

  1. DTCs P0411 and P2430 run during Phase 1
  2. DTCs P2430 and P2440 run during Phase 2
  3. DTC P2444 runs during Phase 3

During phase 1, the secondary air injection pump and the secondary air injection shutoff and check valve are activated. Normal secondary air function occurs. Expected system pressure is 5-13 kPa (0.7-1.9 psi) above BARO.

During phase 2, only the secondary air injection pump is activated. The shutoff and check valve is closed. Pressure sensor performance and shutoff and check valve deactivation are tested. Expected system pressure is 14-25 kPa (2.0-3.6 psi) above BARO.

During phase 3, neither the secondary air injection pump nor the secondary air injection shutoff and check valve are activated. Secondary air injection pump deactivation is tested. Expected system pressure equals BARO.

  1. DTC P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0128, P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0300, P0301, P0302, P0303, P0304, P0351, P0352, P0353, P0354, P0412, P0418, P0420, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P2227, P2228, P2229, P2230, P2430, P2431, P2432, or P2433 is not set.
  2. Greater than 30 min has elapsed since the last cold start.
  3. Ignition voltage is between 10-32 V.
  4. Engine speed is less than 5,000 RPM.
  5. Intake air temperature (IAT) is greater than -11°C (12.2°F).
  6. Engine coolant temperature (ECT) is between -11 and +56°C (12.2-133°F).
  7. Barometric pressure (BARO) is greater than 60 kPa (8.7 psi).
  8. Manifold absolute pressure (MAP) sensor is greater than 20 kPa (2.9 psi).
  9. Mass air flow (MAF) is less than 50 g/s.
  10. Secondary air injection pump is commanded On.
  11. DTC P0411 runs once per ignition cycle when the above conditions are met for greater than 7 s.
  1. The actual system pressure at the shutoff/check valve is at least 4.5 kPa (0.7 psi) greater or 7.5 kPa (1.1 psi) less than the predicted system pressure for greater than 7 s. OR
  2. The difference between the predicted magnitude of pressure pulsations and the actual magnitude of pressure pulsations, at the shutoff/check valve over a specific length of time, exceeds a calibrated threshold.

DTC P0411 is a Type B DTC.

DTC P0411 is a Type B DTC.

  1. Ice buildup due to condensation/water in the air passages or pump may cause the DTC to set.
  2. A partially blocked or restricted exhaust system may cause the DTC to set.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL 36169-HD Fused Jumper

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

  1. Ignition On
  2. Verify that DTC P0412, P0418, P0420, P2430, P2431, P2432, P2433, P2440, or P2444 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set.
  3. Verify the scan tool BARO pressure parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-specifications__altitude-versus-barometric-pressure) table. If not within the specified range Refer to «DTC P2227-P2230 (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) , «DTC P2227-P2230 (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-dtc-p0412-to-dtc-p2635-and-diagnostic-information-and-procedures) . If within the specified range
  4. Verify the scan tool Secondary Air Injection Pressure Sensor and the BARO pressure parameters are within 3 kPa (0.4 psi). If not within the specified range Replace the Q29 Secondary Air Injection Solenoid Valve If within the specified range
  5. Verify the Q29 Secondary Air Injection Solenoid Valve opens and closes when commanding the Secondary Air Injection Solenoid Valve Open and Closed with a scan tool. If the valve does not open and close Refer to Circuit/System Testing-Secondary Air Injection Shutoff and Check Valve Malfunction If the valve opens and closes
  6. Verify the G21 Secondary Air Injection Pump turns On and Off when commanding the Secondary Air Injection Pump Relay between On and Off with a scan tool. If the pump does not turn On and Off Refer to Circuit/System Testing-Secondary Air Injection Pump Malfunction If the pump turns On and Off
  7. Engine running
  8. Verify the scan tool Secondary Air Injection Pressure Sensor parameter increases between 14-25 kPa (2.0-3.6 psi) when the Secondary Air Injection Pump Relay is commanded On with a scan tool. If not within the specified range Refer to Circuit/System Testing-Secondary Air Injection System Pressure Not In Range. If within the specified range
  9. Verify the scan tool Secondary Air Injection Pressure Sensor parameter increases between 5-13 kPa (0.7-1.9 psi) when the Secondary Air Injection System is commanded On with a scan tool. If not within the specified range Refer to Circuit/System Testing-Secondary Air Injection System Pressure Not In Range. If within the specified range
  10. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  11. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing If the DTC does not set
  12. All OK

Secondary Air Injection Shutoff and Check Valve Malfunction

  1. Ignition Off, disconnect the KR26 Secondary Air Injection Solenoid Valve Relay. Ignition On.
  2. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate and the circuit fuse is good Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition Off Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Disconnect the harness connector at the Q29 Secondary Air Injection Solenoid Valve. Test for infinite resistance between the control circuit terminal 5 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test or replace the Q29 Secondary Air Injection Solenoid Valve. If the test lamp illuminates
  3. Disconnect the harness connector at the Q29 Secondary Air Injection Solenoid Valve.
  4. Ignition Off and all vehicle systems Off, it may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohms between the Q29 Secondary Air Injection Solenoid Valve ground circuit terminal 4 and ground. If 10 ohms or greater Ignition Off. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  5. Connect the harness connector at the Q29 Secondary Air Injection Solenoid Valve.
  6. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
  7. Verify the Q29 Secondary Air Injection Solenoid Valve is activated. If the valve does not activate Ignition Off, disconnect the harness connector at the Q29 Secondary Air Injection Solenoid Valve. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the Q29 Secondary Air Injection Solenoid Valve. If the valve activates
  8. Test or replace the KR26 Secondary Air Injection Solenoid Valve Relay.

Secondary Air Injection Pump Malfunction

  1. Ignition Off, disconnect the KR25 Secondary Air Injection Pump Relay.
  2. Verify a test lamp illuminates between the B+ circuit terminal 87 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition Off Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition Off Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Disconnect the harness connector at the G21 Secondary Air Injection Pump. Test for infinite resistance between the control circuit terminal A and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test or replace the G21 Secondary Air Injection Pump. If the test lamp illuminates
  3. Disconnect the harness connector at the G21 Secondary Air Injection Pump.
  4. Ignition Off and all vehicle systems Off, it may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohms between the G21 Secondary Air Injection Pump ground circuit terminal B and ground. If 10 ohms or greater Ignition Off. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  5. Connect the harness connector at the G21 Secondary Air Injection Pump.
  6. Connect a 40 A EL 36169-HD between the B+ circuit terminal 87 and the control circuit terminal 30.
  7. Verify the G21 Secondary Air Injection Pump is activated. If the pump does not activate Ignition Off, disconnect the harness connector at the G21 Secondary Air Injection Pump. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, Test or replace the G21 Secondary Air Injection Pump. If the pump activates
  8. Test or replace the KR25 Secondary Air Injection Pump Relay.

Secondary Air Injection System Pressure Not In Range

  1. Verify the conditions listed below do not exist: Restricted or blocked secondary air injection system hoses/pipes. Leaking or disconnected secondary air injection system hoses/pipes. Damaged secondary air injection shutoff and check valve. Restricted or blocked cylinder head secondary air injection inlet ports and passages. Restricted or blocked exhaust system. Refer to «Restricted Exhaust»(/cadillac/ats/i-2012-2014/remont/exhaust/#engine-exhaust-system) . If a condition is located Repair or replace the affected component as necessary. If all components test normal
  2. Disconnect the secondary air injection hoses/pipe from the Q29 Secondary Air Injection Solenoid Valve.
  3. Ignition On, command the Secondary Air Injection Pump Relay On with a scan tool.
  4. Verify airflow to the Q29 Secondary Air Injection Solenoid Valve. If no airflow Replace the G21 Secondary Air Injection Pump. If airflow
  5. Disconnect the appropriate Q29 Secondary Air Injection Solenoid Valve from the engine.
  6. Connect the harness connector at the Q29 Secondary Air Injection Solenoid Valve.
  7. Connect the secondary air injection pipe between the Q29 Secondary Air Injection Solenoid Valve and the G21 Secondary Air Injection Pump.
  8. Ignition On, command the Secondary Air Injection System Active with a scan tool. Verify there is airflow through the valve. If no airflow Replace the Q29 Secondary Air Injection Solenoid Valve If airflow
  9. Replace the G21 Secondary Air Injection Pump.

Relay Test

  1. Ignition Off, disconnect the appropriate relay.
  2. Test for 70-110 ohms between terminals 85-86. If less than 70 ohms or greater than 110 ohms Replace the relay. If between 70-110 ohms
  3. Test for infinite resistance between the terminals listed below: 30 and 86 30 and 87 30 and 85 85 and 87 If less than infinite resistance Replace the relay. If infinite resistance
  4. Install a 15 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.
  5. Test for less than 2 ohms between terminals 30 and 87. If 2 ohms or greater Replace the relay. If less than 2 ohms
  6. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Relay Replacement (Within an Electrical Center)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Secondary Air Injection Check Valve Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) for secondary air injection solenoid valve replacement
  3. «Secondary Air Injection Pump Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions)

See also:
• Diagnostic System Check Instructions
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Engine Controls Schematics (LTG)
• COMPONENT CONNECTOR END VIEWS - INDEX
• Powertrain Component Views
• Camshaft Actuator System Description
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Powertrain Diagnostic Trouble Code (DTC) Type Definitions
• Control Module References
• Diagnostic Trouble Code (DTC) List - Vehicle
• Diagnostic Repair Verification
• Camshaft Position Actuator Intake Solenoid Valve Replacement
• Oil Pressure Diagnosis and Testing
• Camshaft Timing Chain, Sprocket, and Tensioner Cleaning and Inspection
• Camshaft Timing Chain and Tensioner Removal
• Timing Chain Tensioner Replacement
• DTC P0641, P0651, P0697, or P06A3 (ECM, LCV without turbocharger)
• Throttle Body Cleaning
• Altitude Versus Barometric Pressure
• Camshaft Position Actuator and Camshaft Replacement - Intake
• Special Tools (Diagnostic Tools)
• Temperature Versus Resistance - Intake Air Temperature Sensor (Hitachi Sensor)
• Symptoms - Engine Exhaust
• Symptoms - Engine Mechanical (LCV)
• Cooling System Description and Operation
• Temperature Versus Resistance - Engine Coolant Temperature Sensor
• Cooling System Leak Testing
• Cooling System Draining and Filling (Static Fill)
• Cooling System Draining and Filling (GE 47716)
• Oil Consumption Diagnosis
• Loss of Coolant
• Crankcase Ventilation System Inspection/Diagnosis (LCV)
• Crankcase Ventilation System Inspection/Diagnosis (LTG)
• Fuel Injector Replacement
• Fuel Tank Fuel Pump Module Replacement
• Turbocharger Cleaning and Inspection
• Electronic Ignition System Description
• Crankshaft Position System Variation Learn
• Ignition System Specifications
• Battery Inspection/Test
• Fastener Tightening Specifications
• Secondary Air Injection System Description
• Restricted Exhaust
• Relay Replacement (Within an Electrical Center)
• Relay Replacement (Attached to Wire Harness)
• DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LCV)

More articles — Engine Performance