Engine Controls and Fuel - 3.9l - DTC p0010 Through DTC p0340 Chevrolet Impala IX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The camshaft position (CMP) actuator is attached to the camshaft and is hydraulically operated in order to change the angle of the camshaft relative to crankshaft position (CKP). The CMP actuator solenoid is controlled by the engine control module (ECM). The ECM sends a pulse width modulated 12-volt signal to a CMP actuator solenoid. The solenoid controls the amount of engine oil flow to the CMP actuator by extending a pintle within the solenoid. The pintle acts against a spool valve in the CMP actuator mechanism which is attached to the front of the camshaft. As the spool valve is moved, oil is directed to the CMP actuator, which rotates the camshaft. The CMP actuator can change the cam angle a maximum of 27 degrees.

Conditions for Running the DTC

1. The ignition is in Crank or Run.
2. The system voltage is between 11-18 volts.
3. DTC P0010 runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the state of the driver and the state of the circuit do not match. The ECM will detect an open, short to ground, or a short to voltage on the high control circuit or an open on the low reference circuit for more than 6.25 seconds.

Action Taken When the DTC Sets

1. DTC P0010 is a Type B DTC.
2. The CMP actuator is commanded to the parked position.

Conditions for Clearing the MIL/DTC

DTC P0010 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Description and Operation

1. «Camshaft Actuator System Description»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-description-and-operation)
2. «Lubrication Description»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-35l-description-and-operation)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Allow the engine to reach operating temperature.
2. Set the parking brake and place the vehicle in park for automatic, or neutral for manual.
3. Observe the CMP variance parameter. The CMP Variance will rise for 1-2 seconds until the CMP Angle parameter matches the Desired CMP parameter. The CMP Variance should again return to 0 degrees.
4. Command the CMP actuator to 20 degrees. The Desired CMP parameter should match the CMP Angle parameter.
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.

Circuit/System Testing

1. Ignition OFF, disconnect the CMP actuator solenoid harness connector at the CMP actuator solenoid.
2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance.
3. Verify that a test lamp does not illuminate between the low reference circuit terminal 2 and the control circuit terminal 1. If the test lamp illuminates, test the control circuit for short to voltage. If the circuit tests normal, replace the ECM.
4. Remove the test lamp.
5. Command the CMP Actuator Sol. ON with a scan tool. Verify the scan tool CMP Sol Ckt Short Gnd Test status is OK. If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
6. Install a 3A fused jumper wire between the control circuit terminal 1 and the low reference circuit terminal 2. Command the CMP Actuator Sol. ON with a scan tool. Verify the scan tool CMP Sol Ckt Short Gnd Test status is Fault. If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

Component Testing

Static Test

1. Ignition OFF, disconnect the CMP actuator solenoid harness connector at the CMP actuator solenoid.
2. Test for 4.6-5.2 ohms of resistance between the high control terminal 1 and the low reference terminal 2 of the CMP actuator solenoid. If the resistance is not within the specified range, replace the CMP actuator solenoid.

Dynamic Test

1. Install fused jumper wire between the high control terminal 1 and 12 volts. Install a jumper wire between the low reference terminal 2 and momentarily connect to ground.
2. Point the CMP actuator solenoid towards a shop towel. Observe the operation of the solenoid immediately extends. If the function does not perform as specified, replace the CMP actuator solenoid.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Camshaft Position Actuator Magnet Replacement»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-repair-instructions-on-vehicle)
2. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The camshaft position (CMP) actuator is attached to the camshaft and is hydraulically operated in order to change the angle of the camshaft relative to crankshaft position (CKP). The CMP actuator solenoid is controlled by the engine control module (ECM). The ECM sends a pulse width modulated 12-volt signal to a CMP actuator solenoid. The solenoid controls the amount of engine oil flow to the CMP actuator by extending a pintle within the solenoid. The pintle acts against a spool valve in the CMP actuator mechanism which is attached to the front of the camshaft. As the spool valve is moved, oil is directed to the CMP actuator, which rotates the camshaft. The CMP actuator can change the cam angle a maximum of 27 degrees.

1. DTC P0010, P0016, P0335, P0336, P0340, or P0341 are not set.
2. The system voltage is between 11-18 volts.
3. The engine is running.
4. The control module has enabled the CMP actuator and commanded greater than 0 degrees.
5. DTC P0011 runs continuously when the above conditions are met.

1. The CMP angle from the ECM is stable. If the CMP angle varies more than 7.5 cam degrees, then a stability timer of 2 seconds must expire before evaluating fail condition.
2. The difference between the desired CMP and the actual CMP angle is more than 8 degrees for 27.5 seconds during a 500-second sample.

1. DTC P0011 is a Type B DTC.
2. The CMP actuator is commanded to the parked position.

DTC P0011 is a Type B DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Description and Operation

1. «Camshaft Actuator System Description»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-description-and-operation)
2. «Lubrication Description»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-35l-description-and-operation)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Observe the engine oil level. The engine oil level should be within operating range. Refer to «Approximate Fluid Capacities»(/chevrolet/impala/ix-2006-2016/remont/lubrication-system/#maintenance-and-lubrication__approximate-fluid-capacities) .
2. Ensure that the vehicle has the correct engine oil and is not old, burnt or contains additives. Refer to Checking Things Under the Hood in Service and Appearance Care within the Owner's Manual. If the vehicle has the incorrect engine oil, is old, burnt, or contains additives then change the oil and filter.
3. Allow the engine to reach operating temperature.
4. Set the parking brake and place the vehicle in park for automatic, or neutral for manual.
5. Observe the CMP variance parameter. The CMP Variance will rise for 1-2 seconds until the CMP Angle parameter matches the Desired CMP parameter. The CMP Variance should again return to 0 degrees.
6. Command the CMP actuator to 20 degrees. The Desired CMP parameter should match the CMP Angle parameter.
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.

1. Ignition OFF, disconnect the CMP actuator solenoid harness connector at the CMP actuator solenoid.
2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance.
3. Verify that a test lamp does not illuminate between the low reference circuit terminal 2 and the control circuit terminal 1. If the test lamp illuminates, test the control circuit for short to voltage. If the circuit tests normal, replace the ECM.
4. Remove the test lamp.
5. Command the CMP Actuator Sol. ON with a scan tool. Verify the scan tool CMP Sol Ckt Short Gnd Test status is OK. If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
6. Install a 3A fused jumper wire between the control circuit terminal 1 and the low reference circuit terminal 2. Command the CMP Actuator Sol. ON with a scan tool. Verify the scan tool CMP Sol Ckt Short Gnd Test status is Fault. If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
7. Determine that the vehicle has the correct engine oil. Refer to Service and Appearance Care in the owner's manual. If the engine oil life system monitor displays the Change Oil Soon message, the engine oil is more than one year old, contains additives, or is not the correct viscosity, change the oil.
8. Test the engine oil pressure. Refer to «Oil Pressure Diagnosis and Testing»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-diagnostic-information-and-procedures) . If the oil pressure is low, correct the low pressure first.
9. Inspect each CMP actuator solenoid valve assembly for the following: Torn screens Debris on the screens Debris clogging the oil ports Missing screens Oil seepage at the solenoid connector pins
10. Connect a jumper wire between the CMP actuator low reference circuit terminal 2 at the solenoid and a good ground. Connect a fused jumper wire to the CMP actuator control circuit terminal 1 at the solenoid. Point the CMP actuator towards a shop towel. Momentarily touch the fused jumper to B+. Observe the CMP actuator pintle. The pintle should immediately extend. If movement is not observed, replace the CMP actuator solenoid.
11. Inspect the engine timing components. Refer to «Camshaft Timing Chain and Sprocket Cleaning and Inspection»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-35l-repair-instructions-off-vehicle-1-of-3__camshaft-timing-chain-and-sprocket-cleaning) .
12. If all circuits test normal, test or replace the CMP actuator.

1. Ignition OFF, disconnect the CMP actuator solenoid harness connector at the CMP actuator solenoid.
2. Test for 4.6-5.2 ohms of resistance between the high control terminal 1 and the low reference terminal 2 of the CMP actuator solenoid. If the resistance is not within the specified range, replace the CMP actuator solenoid.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Camshaft Position Actuator Magnet Replacement»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-repair-instructions-on-vehicle)
2. «Timing Chain and Sprocket Removal»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-35l-repair-instructions-off-vehicle-1-of-3) for timing chain, sprockets, CMP actuator filter screen, and CMP actuator replacement.
3. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/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 (CKP) sensor and the camshaft position (CMP) sensor pulses to monitor the correlation between the crankshaft and camshaft position. The crankshaft reluctor wheel consists of a 60-tooth pattern with 2 teeth missing for a reference gap. Each tooth is evenly spaced 6 degrees apart, except for the reference gap. The camshaft reluctor wheel has 4 teeth, 2 narrow and 2 wide. The 4 trailing edges of each tooth are evenly spaced 90 camshaft degrees apart. As the crankshaft rotates with the CMP actuator in the home or parked position, the ECM expects CMP sensor pulses to occur 36 crankshaft degrees before top dead center (BTDC) at cylinder number 1, and every 90 camshaft degrees thereafter.

1. DTC P0335, P0336, P0340, P0341, P0641, or P0651 is not set.
2. The engine is running.
3. The engine speed is less than 1,200 RPM and the CMP Actuator is commanded to the home or parked position.
4. The DTC runs continuously when the above conditions are met.

The ECM detects that the CMP sensor pulses occur less than or more than 9 crankshaft degrees outside of the normal position for 25 out of 35 engine cycles.

1. DTC P0016 is a Type B DTC.
2. The CMP actuator is commanded to the home or parked position.

DTC P0016 is a Type B DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Description and Operation

1. «Camshaft Actuator System Description»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-description-and-operation)
2. «Lubrication Description»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-35l-description-and-operation)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Observe the engine oil level. The engine oil level should be within operating range. Refer to «Approximate Fluid Capacities»(/chevrolet/impala/ix-2006-2016/remont/lubrication-system/#maintenance-and-lubrication__approximate-fluid-capacities) .
2. Ensure that the vehicle has the correct engine oil and is not old, burnt, or contains additives. Refer to Checking Things Under the Hood in Service and Appearance Care within the Owner's Manual. If the vehicle has the incorrect engine oil, is old, burnt, or contains additives, change the oil and filter.
3. Test the engine oil pressure for correct operation. Refer to «Oil Pressure Diagnosis and Testing»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-diagnostic-information-and-procedures) .
4. Allow the engine to reach operating temperature.
5. Set the parking brake and place the vehicle in Park for automatic, or Neutral for manual.
6. Observe the CMP variance parameter. The CMP Variance will rise for 1-2 seconds until the CMP Angle parameter matches the Desired CMP parameter. The CMP Variance should again return to 0 degrees.
7. Command the CMP actuator to 20 degrees. The Desired CMP parameter should match the CMP Angle parameter.

1. Inspect the engine or review the service history of the vehicle for any recent repairs involving the timing chain, camshaft, or crankshaft. If recent repairs were made, refer to «Camshaft Timing Chain and Sprocket Replacement»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-repair-instructions-on-vehicle) and inspect the timing chain and sprockets for proper alignment.
2. Inspect the CMP actuator. Refer to «Camshaft Position Actuator Cleaning and Inspection»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-35l-repair-instructions-off-vehicle-2-of-3__camshaft-position-actuator-cleaning-and-inspection) and «Camshaft Position Actuator Magnet Cleaning and Inspection»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-35l-repair-instructions-off-vehicle-1-of-3__camshaft-position-actuator-magnet-cleaning-and) .
3. Inspect the engine timing components. Refer to «Camshaft Timing Chain and Sprocket Cleaning and Inspection»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-35l-repair-instructions-off-vehicle-1-of-3__camshaft-timing-chain-and-sprocket-cleaning) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Timing Chain and Sprocket Removal for timing chain, sprockets, CMP actuator filter screen, and CMP actuator replacement

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

HO2S Heater Sensor 1

HO2S Heater Sensor 2

Typical Scan Tool Data

HO2S Heater Sensor 1

HO2S Heater Sensor 2

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 sensor 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 and P0036

1. The engine is cranking or running.
2. The system voltage is between 11-18V.

P0053 and P0054

1. DTC P2610 has run and passed.
2. The ignition is OFF for more than 10 hours.
3. The ECT Sensor parameter is between -30 and +45°C (-22 and +113°F) at engine start-up.
4. The system voltage is less than 18V.
5. This diagnostic runs one time per valid cold start when the above conditions are met.

P0135

1. DTCs P0030, P0053, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0135, P0141, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1516, P2101, P2135, P2176 are not set.
2. The system voltage is between 10-18V.
3. The scan tool special functions are not active.
4. The Engine Run Time parameter is more than 180 seconds.
5. The ECT Sensor parameter is at least 65°C (149°F).
6. The MAF Sensor parameter is between 5-30 g/s.
7. The Engine Speed parameter is between 500-3,000 RPM.
8. The above conditions have been met for more than 6 seconds.

P0141

1. DTCs P0036, P0054, P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1516, P2101, P2135, P2176 are not set.
2. The system voltage is between 10-18V.
3. The scan tool special functions are not active.
4. The Engine Run Time parameter is at least 180 seconds.
5. The ECT parameter is at least 65°C (149°F).
6. The MAF Sensor parameter is between 5-30 g/s.
7. The Engine Speed parameter is between 500-3,000 RPM.
8. The above conditions have been met for more than 6 seconds.

P0030 and P0036

1. The control module detects that the HO2S heater control circuit status is incorrect for more than 2 seconds.
2. This diagnostic runs continuously.

P0053 and P0054

The control module detects that the HO2S heater calculated resistance is not within an expected range at engine start-up for 1 second.

P0135

1. The HO2S heater current is less than 0.31 amp or more than 1.5 amps for more than 8 seconds, twice within a 1-minute test period.
2. The test is run 2 times per trip.

P0141

1. The HO2S heater current is less than 0.21 amp or more than 0.96 amp for more than 8 seconds, twice within a 1-minute test period.
2. The test is run 2 times per trip.

DTCs P0030, P0036, P0053, P0054, P0135, and P0141 are Type B DTCs

DTCs P0030, P0036, P0053, P0054, P0135, and P0141 are Type B DTCs

Diagnostic Aids

When using a high impedance, low current draw, test lamp to load the heater circuit, the test lamp flash may be dim, the scan tool Heater Command parameter may indicate 7 percent, and the Heater parameter may indicate 0 amps. This is a normal condition.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
5. «Heated Oxygen Sensor Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__heated-oxygen-sensor-wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Allow the engine to reach operating temperature.
2. Engine running, verify the appropriate scan tool HO2S Heater parameter is varying between approximately 0.5-2 amp.
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.

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

1. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
2. Ignition ON, verify that a test lamp illuminates between the appropriate HO2S heater voltage supply circuit terminal D and ground. If the test lamp does not illuminate, test the HO2S heater voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the HO2S heater voltage supply circuit fuse is open, test all components connected to the fuse and replace as necessary.
3. Ignition ON, verify that a test lamp does not illuminate between the appropriate HO2S heater voltage supply circuit terminal D and the appropriate HO2S heater low control circuit terminal C. If the lamp illuminates, test the HO2S heater low control circuit for a short to ground. If the circuit tests normal, replace the ECM.
4. Engine running, leave the test lamp connected from the previous step. The lamp should flash or be ON steady. If the test lamp is not ON steady or flashing, test the HO2S heater low control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
5. Ignition OFF, install a 30A fused jumper wire between the appropriate HO2S heater voltage supply circuit terminal D and the appropriate HO2S heater low control circuit terminal C.
6. Engine running, verify the appropriate scan tool HO2S Heater parameter is less than 0.1 amp. If more than the specified range, test the HO2S heater voltage supply and HO2S heater low control circuits for more than 1 ohm. If the circuits test normal, replace the ECM.
7. If the ECM and all circuits test normal, replace the appropriate HO2S.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Heated Oxygen Sensor Replacement - Sensor 1»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
2. «Heated Oxygen Sensor Replacement - Sensor 2»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
3. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control module replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

The engine control module (ECM) uses the following information to calculate an expected airflow rate

1. The throttle position (TP)
2. The barometric pressure (BARO)
3. The manifold absolute pressure (MAP)
4. The intake air temperature (IAT)
5. The engine RPM
6. The mass air flow (MAF)

P0068

1. The engine is running.
2. DTC P0120, P0220, P0601, P0602, P0603, P0604, P0606, P0607, P060D, P1516, P2101, P2119, or P2176 is not set.
3. The DTC runs continuously when the above conditions are met.

P0121

1. The engine is running.
2. DTC P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, or P0336 is not set.
3. The engine coolant temperature (ECT) is between 70-125°C (158-257°F)
4. The intake air temperature (IAT) is between -7 and +125°C (+19 and +257°F)
5. The DTC runs continuously when the above conditions are met.

The ECM detects that the airflow rate is greater than the calculated airflow for greater than 0.2 second.

1. DTC P0068 is a Type A DTC.
2. DTC P0121 is a Type B DTC.
3. The ECM commands the TAC system to operate in the Reduced Engine Power mode.

1. DTC P0068 is a Type A DTC.
2. DTC P0121 is a Type B DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Description and Operation

Throttle Actuator Control (TAC) System Description

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Inspect for the following conditions: Vacuum hoses for splits, kinks, and proper connections as shown on Vehicle Emission Control Information label Inspect thoroughly for any type of leak or restriction Air leaks at throttle body mounting area and intake manifold sealing surfaces Inspect throttle body for dirt, debris, and coking. Refer to «Throttle Body Inspection and Cleaning»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions__throttle-body-inspection-and-cleaning) .
2. Allow the engine to reach operating temperature. Observe the MAP Sensor Voltage parameter with a scan tool. Voltage should be greater than 0.8 volt and less than 4 volts. If greater than 4 volts or less than 0.8 volt, refer to «DTC P0106»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-dtc-p0010-through-dtc-p0340) .
3. Idle the engine. Observe the MAP Sensor kPa parameter with a scan tool. Increase the engine speed slowly and then back to idle. The MAP sensor kPa should change smoothly and gradually as engine speed is increased and returned to idle. If the MAP sensor kPa does not change refer to «DTC P0106»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-dtc-p0010-through-dtc-p0340) .
4. Take a snapshot of the engine data list while performing the actions listed below. The mass air flow (MAF) sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle. Idle the engine. Increase the engine speed slowly to 3,000 RPM, then back to idle. Exit from the snapshot and review the data. Observe the Mass Air Flow (MAF) Sensor parameter frame by frame with a scan tool. The MAF sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle. If the MAF sensor g/s does not change smoothly and gradually as the engine speed is increased and is returned to idle refer to «DTC P0101 or P1101»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-dtc-p0010-through-dtc-p0340) .
5. Inspect the throttle body for the following conditions: Loose or damaged throttle blade Broken throttle shaft Any throttle body damage If any of these conditions exist, replace the throttle body assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Air Cleaner Element Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
2. «Air Cleaner Outlet Duct Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
3. «Lower Intake Manifold Replacement»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-repair-instructions-on-vehicle)
4. «Manifold Absolute Pressure Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
5. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
6. «Throttle Body Assembly Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
7. «Upper Intake Manifold Replacement»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-repair-instructions-on-vehicle)

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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, 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 to each other to determine the appropriate DTC to fail. The following table illustrates the possible failure combinations and the resulting DTC or DTCs.

Scan Tool Diagnostic Test Results

Conditions for Running the DTCs

1. DTCs P0016, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335 or P0336 are not set.
2. The engine is running.
3. The engine coolant is between 70-125°C (158-257°F).
4. The intake air temperature is between -7 and +125°C (+19.4 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.

DTCs P0101 and P1101 are Type B DTCs.

DTCs P0101 and P1101 are Type B DTCs.

1. A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
2. Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will cause the MAF sensor signal to be skewed or erratic. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
3. Certain aftermarket air filters may cause this DTC to set.
4. Certain aftermarket air induction systems may cause this DTC to set.
5. Modifications to the air induction system may cause this DTC to set.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 38522 Variable Signal Generator

1. Verify that DTCs P0641 and P0651 are not set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Verify that restrictions do not exist in the exhaust system. Refer to «Restricted Exhaust»(/chevrolet/impala/ix-2006-2016/remont/exhaust/#engine-exhaust-system) .
3. Engine running at idle, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,800 Hz depending on the ECT.
4. A wide open throttle (WOT) acceleration from a stop should cause the MAF Sensor parameter on the scan tool to increase rapidly. This increase should be from 2-6 g/s at idle to greater than 180 g/s at the time of the 1-2 shift.
5. Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions.
6. Verify the proper operation of the ECT and IAT sensors. A skewed or stuck ECT or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to «Temperature Versus Resistance»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-specifications__temperature-versus-resistance) .
7. Verify the proper operation of the MAP sensor. A skewed MAP sensor will cause the BARO value to be inaccurate. Refer to «DTC P0106»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-dtc-p0010-through-dtc-p0340) .
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.

1. Verify the integrity of the entire air induction system by inspecting for the following conditions: Any damaged components Loose or improper installation An air flow restriction Any vacuum leaks Water intrusion In cold climates, inspect for any snow or ice buildup Inspect the MAF sensor element for contamination.
2. Ignition OFF, disconnect the harness connector at the B75B MAF/IAT sensor.
3. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes, test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
6. Ignition OFF, connect the red lead of the J 38522 to the signal circuit terminal A at the B75B MAF/IAT sensor harness connector. Connect the battery voltage supply to the B+, and the black lead to ground.
7. Set the J 38522 signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal.
8. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,025 Hz. If the MAF Sensor parameter is not within the specified range, replace the K20 ECM.
9. If all other circuits test normal, test or replace the B75B MAF/IAT sensor.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Engine Coolant Temperature Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
2. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
3. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

MAF Sensor

The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor. The MAF sensor is an air flow meter that measures the amount of air entering the engine. 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 MAF/IAT sensor has the following circuits

1. The ignition 1 voltage circuit
2. The ground circuit
3. The MAF sensor signal circuit
4. The IAT sensor signal circuit
5. The IAT low reference circuit

The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. The sensor uses the voltage to produce a frequency based on the inlet air flow through the sensor bore. The frequency varies in a range of near 2,000 Hertz at idle to near 10,000 Hertz at maximum engine load.

1. The engine is running for greater than 1 s.
2. The ignition 1 signal is greater than 8 V.
3. The above conditions are met for greater than 0.5 s.
4. The DTC runs continuously when the above conditions are met.

P0102

The ECM detects that the MAF Sensor parameter is less than 1,200 Hz for greater than 10 s.

P0103

The ECM detects that the MAF Sensor parameter is greater than 11,500 Hz for greater than 10 s.

DTCs P0102 and P0103 are Type B DTCs.

DTCs P0102 and P0103 are Type B DTCs.

1. A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
2. Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will cause the MAF sensor signal to be skewed or erratic. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 38522 Variable Signal Generator

1. Engine running, observe the scan tool MAF Sensor parameter. The reading should be between 1,700-3,800 Hz depending on the engine coolant temperature (ECT).
2. A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 2-6 g/s at idle to greater than 180 g/s at the time of the 1-2 shift.
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.

1. Verify the integrity of the air induction system by inspecting for the following conditions: Loose or improper installation Water intrusion
2. Ignition OFF, disconnect the harness connector at the B75B MAF/IAT sensor.
3. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes, test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
6. Ignition OFF, connect the red lead of the J 38522 to the signal circuit terminal A at the B75B MAF/IAT sensor harness connector. Connect the battery voltage supply to B+, and the black lead to ground.
7. Set the J 38522 signal to 5 V, the Frequency to 5K, and the Duty Cycle to Normal.
8. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,025 Hz. If the MAF Sensor parameter is not within the specified range, replace the K20 ECM.
9. If all other circuits test normal, replace the B75B MAF/IAT sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
2. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

MAP Sensor

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 (TP) 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), TP, 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 TP 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 TP sensors and to each other to determine the appropriate DTC to fail. The following table illustrates the possible failure combinations and the resulting DTC or DTCs.

Scan Tool Diagnostic Test Results

1. DTCs P0016, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, or P0336 are not set.
2. The engine is running.
3. The engine coolant is between 70-125°C (158-257°F).
4. The intake air temperature is between -7 and +125°C (+19.4 and +257°F).
5. This DTC runs continuously when the above conditions are met.

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

DTC P0106 is a Type B DTC.

Conditions for Clearing the DTC

DTC P0106 is a Type B DTC.

1. A wide open throttle (WOT) acceleration from a stop should cause the MAP sensor parameter on the scan tool to increase rapidly to near the BARO parameter at the time of the 1-2 shift.
2. A skewed or stuck engine coolant temperature (ECT) sensor or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to «Temperature Versus Resistance»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-specifications__temperature-versus-resistance) .
3. The Calculated BARO that is derived from the MAP sensor at ignition on, is only used to help diagnose the BARO sensor in this application. The BARO sensor is used by the ECM to calculate the air flow models. A skewed BARO sensor will cause the air flow model results to be inaccurate.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. J-23738-A Mityvac
2. J-35555 Metal Mityvac

1. Verify that the following DTCs are not set: P0069, P0641, P0651, P2227, P2228, or P2229. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Verify that restrictions do not exist in the exhaust system. Refer to «Restricted Exhaust»(/chevrolet/impala/ix-2006-2016/remont/exhaust/#engine-exhaust-system) .
3. Verify that the engine is in good mechanical condition. Refer to «Symptoms - Engine Mechanical»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-diagnostic-information-and-procedures) .
4. Ignition OFF for 90 seconds, determine the current vehicle testing altitude.
5. Ignition ON, observe the scan tool MAP sensor parameter. Start the engine. The MAP Sensor parameter should change.
6. Ignition ON, engine OFF, observe the scan tool BARO parameter. Compare the parameter to the «Altitude Versus Barometric Pressure»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-specifications__altitude-versus-barometric-pressure) table. The BARO parameter should be within the specified range indicated in the table.
7. Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions. The readings should be within 3 kPa of the known good vehicle.
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.

1. Verify the integrity of the entire air induction system by inspecting for the following conditions: Any damaged components Loose or improper installation An air flow restriction Any vacuum leak Improperly routed vacuum hoses In cold climates, inspect for any snow or ice buildup. Verify that restrictions do not exist in the MAP sensor port or vacuum source.
2. Ignition OFF, disconnect the harness connector at the MAP sensor.
3. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
4. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground. If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Verify the scan tool MAP parameter is less than 2 kPa. If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.
6. Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 1. Verify the scan tool MAP parameter is greater than 126 kPa. If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
7. If all circuits test normal, test or replace the MAP sensor.

Skewed Sensor Test

1. Ignition OFF, remove the vacuum source from the MAP sensor.
2. Ignition ON, observe and record the scan tool MAP sensor pressure parameter. This is the first MAP sensor reading.
3. With the J-23738-A or J-35555 apply 5 in Hg (17 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure parameter. This is the second MAP sensor reading.
4. Subtract the second MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum. If the vacuum decrease is not within the specified range, replace the MAP sensor.
5. With the J-23738-A or J-35555 apply 10 in Hg (34 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure parameter. This is the third MAP sensor reading.
6. Subtract the third MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum. If the vacuum decrease is not within the specified range, replace the MAP sensor.

Erratic Signal Test

1. Ignition OFF, remove the MAP sensor.
2. Install a 3A fused jumper wire between the 5-volt reference circuit terminal 1 and the corresponding terminal of the MAP sensor.
3. Install a jumper wire between the low reference circuit terminal 2 of the MAP sensor and ground.
4. Install a jumper wire at terminal 3 of the MAP sensor.
5. Connect a DMM between the jumper wire from terminal 3 of the MAP sensor and ground.
6. Ignition ON, with the J-23738-A or J-35555 , slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 volts, without any spikes or dropouts. If the voltage reading is erratic, replace the MAP sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Manifold Absolute Pressure Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
2. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

MAP Sensor

The MAP sensor has a 5V reference circuit, a low reference circuit, and a signal circuit. The engine control module (ECM) supplies 5V to the MAP sensor on a 5V reference circuit, and provides a ground on a low reference circuit. The MAP sensor provides a voltage signal to the ECM on a signal circuit relative to the intake manifold pressure changes.

P0107

1. DTCs P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0641, P0651 or P2135 are not set.
2. The engine is running greater than or equal to 400 RPM.
3. The throttle position is greater than or equal to 0 percent when the engine speed is less than or equal to 1,000 RPM. OR
4. The throttle position is greater than or equal to 12.5 percent when the engine speed is greater than 1,000 RPM.
5. The DTC runs continuously when the above conditions are met.

P0108

1. The engine has been running for a length of time that is determined by the start-up coolant temperature. The length of time ranges from 5.5 minutes at colder than -30°C (-22°F) to 10 seconds at greater than +30°C (+86°F).
2. DTCs P0120, P0121, P0122, P0123, P0220, P0222, P0223, or P2135 are not set.
3. The throttle position is less than or equal to one percent when the engine speed is less than or equal to 1,200 RPM. OR
4. The throttle position is less than or equal to 20 percent when the engine speed is greater than 1,200 RPM.
5. The DTC runs continuously when the above conditions are met.

P0107

The ECM detects that the MAP sensor voltage is less than 0.05V for greater than 5 seconds.

P0108

The ECM detects that the MAP sensor voltage is more than 4.9V for greater than 5 seconds.

DTCs P0107 and P0108 are Type B DTCs.

DTCs P0107 and P0108 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. J-23738-A Mityvac
2. J-35555 Metal Mityvac

1. Verify that the following DTCs are not set: P0641 or P0651. If any of the DTCs are set, refer to «DTC P0641 or P0651»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-dtc-p0341-through-dtc-p2544) .
2. Ignition ON, observe the MAP Sensor parameter. The reading should be between 0.05-4.9V.
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.

1. Ignition OFF, disconnect the harness connector at the MAP sensor.
2. Ignition OFF for 90 seconds, test for less than 5 ohms between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2V between the 5V reference circuit terminal 1 and ground. If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Verify the scan tool MAP Sensor parameter is less than 2 kPa. If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.
5. Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5V reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 126 kPa. If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
6. If all circuits test normal, test or replace the MAP sensor.

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

1. Ignition OFF, remove the MAP sensor.
2. Install a 3A fused jumper wire between the 5V reference circuit terminal 1 and the corresponding terminal of the MAP sensor.
3. Install a jumper wire between the low reference circuit terminal 2 of the MAP sensor and ground.
4. Install a jumper wire at terminal 3 of the MAP sensor.
5. Connect a DMM between the jumper wire from terminal 3 of the MAP sensor and ground.
6. Ignition ON, with the J-23738-A or J-35555 slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2V, without any spikes or dropouts. If the voltage reading is erratic, replace the MAP sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Manifold Absolute Pressure Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
2. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

IAT Sensor

The intake air temperature (IAT) sensor is a variable resistor. The IAT sensor has a signal circuit and a low reference circuit. The IAT sensor measures the temperature of the air entering the engine. The engine control module (ECM) supplies 5 V to the IAT signal circuit, and a ground for the IAT low reference circuit.

P0112

1. DTC P0116 or P0117 is not set.
2. The engine run time is greater than 10 s.
3. The DTC runs continuously when the above conditions are met.

P0113

1. DTC P0101, P0102, P0103, P0116, P0117 or P0118 is not set.
2. The engine run time is greater than 10 s.
3. The DTC runs continuously when the above conditions are met.

P0112

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

P0113

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

DTCs P0112 and P0113 are Type B DTCs.

DTCs P0112 and P0113 are Type B DTCs.

1. Ignition ON, engine OFF, if the engine is cold, a properly functioning IAT sensor will gradually increase the scan tool IAT Sensor parameter. This is due to the heat that is generated by the mass air flow (MAF) sensor heating elements.
2. Depending on the ambient temperature, an IAT sensor signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit can cause a DTC P0113 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter.
3. An IAT sensor signal circuit that is shorted to the MAF sensor ignition circuit can cause a DTC P0113 to set.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF for 8 hours or greater.
2. Ignition ON, observe the scan tool IAT and ECT sensor parameters. The ECT, IAT, and ambient temperatures should be within 15°C (27°F) of each other.
3. Engine running, observe the scan tool IAT Sensor parameter. The reading should be between -39 to +120°C (-38 to +248°F), depending on the current ambient temperature and the vehicle operating conditions.

1. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes.
2. Ignition OFF, disconnect the harness connector at the B75B MAF/IAT sensor.
3. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal D and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
4. Ignition ON, verify the scan tool IAT parameter is colder than -39°C (-38°F). If warmer than the specified range, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the K20 ECM.
5. Install a 3 A fused jumper wire between the signal circuit terminal E and a good ground. Verify the scan tool IAT parameter is warmer than 149°C (300°F). If colder than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
6. If all circuits test normal, test or replace the B75B MAF/IAT sensor.

Measure and record the resistance of the IAT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance table.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
2. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

ECT Sensor Temperature

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 volts to the ECT sensor signal circuit, and supplies a ground to the low reference circuit. The ECM uses this high side coolant rationality diagnostic to determine if the input from the ECT sensor is skewed warmer than normal. The internal clock of the ECM will record the amount of time the ignition is OFF. If the calibrated ignition OFF timer is met at start-up, the ECM will compare the temperature difference between the ECT and the intake air temperature (IAT) sensor to determine if the temperatures are within an acceptable operating range of each other.

1. DTCs P0112, P0113, P0117, P0118, P0601, P0602, P0603, P0604, P0606, P0607, P062F, P2610 are not set.
2. The ignition is ON.
3. The IAT parameter is greater than 15°C (59°F).
4. The Fuel Level Sensor parameter is greater than 10 percent.
5. The vehicle has a minimum ignition OFF time of 8 hours.
6. The DTC runs once per ignition cycle when the above conditions are met.

1. The ECM detects a temperature difference between the ECT sensor and the IAT sensor of greater than 100°C (180°F) at start-up. OR
2. The ECM detects a temperature difference between the ECT sensor and the IAT sensor that is greater than 15°C (27°F) and the time elapsed cranking the engine without starting is greater than 5 seconds. OR
3. The ECM detects a temperature difference between the ECT sensor and the IAT sensor that is greater than 15°C (27°F). The vehicle must then be driven for 5 minutes over 40 km/h (25 mph). If the IAT sensor temperature decreases greater than 5°C (9°F), an engine block heater was detected and the test is aborted. If the IAT sensor temperature does not decrease, an engine block heater was not detected and DTC P0116 will set.

DTC P0116 is a Type B DTC.

DTC P0116 is a Type B DTC.

1. Inspect the ECT sensor terminals for corrosion and for engine coolant leaking through the sensor. Engine coolant that is leaking through the sensor will create a high resistance short to ground. This condition results in less voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a warmer ECT.
2. An IAT sensor that is skewed colder at various ambient temperatures due to greater resistance than is normal will increase the range between these two sensors. Measure and record the resistance of the IAT sensor at various ambient temperatures, then compare those measurements to the Temperature vs Resistance table. Refer to «Temperature Versus Resistance»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-specifications__temperature-versus-resistance) .
3. A slight to moderate resistance in the IAT sensor signal circuit or low reference circuit will increase the range between these two sensors. This condition results in a greater voltage on the IAT sensor signal circuit, which is interpreted by the ECM as a colder IAT.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, inspect the cooling system surge tank for the proper coolant level. Refer to «Cooling System Leak Testing»(/chevrolet/impala/ix-2006-2016/remont/cooling-system-mechanical/#engine-cooling-system) and «Cooling System Draining and Filling (9C1, 9C3 Static Fill)»(/chevrolet/impala/ix-2006-2016/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (LZE, LGD Static Fill)»(/chevrolet/impala/ix-2006-2016/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (LZE, LGD GE47716 Fill)»(/chevrolet/impala/ix-2006-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Ignition OFF for 8 hours or greater.
3. Ignition ON, observe the scan tool IAT and ECT sensor parameters. The ECT, IAT, and ambient temperature should be within 15°C (27°F) of each other.
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.

1. Ignition OFF, disconnect the harness connector at the ECT sensor.
2. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, verify the scan tool ECT parameter is colder than -39°C (-38°F). If warmer than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
4. Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT parameter is warmer than 149°C (300°F). If colder than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
5. If all circuits test normal, test or replace the ECT sensor.

Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance table.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Engine Coolant Temperature Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
2. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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 volts to the ECT sensor signal circuit and supplies a ground for the low reference circuit.

P0117

1. The engine run time is greater than 10 seconds. OR The ignition is ON and the IAT parameter is colder than 90°C (194°F).
2. The DTC runs continuously when one of the above conditions is met.

P0118

1. The engine is running for greater than 10 seconds. OR The ignition is ON and the IAT parameter is warmer than 0°C (32°F).
2. The DTC runs continuously when one of the above conditions is met.

P0117

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

P0118

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

DTCs P0117 and P0118 are Type B DTCs.

DTCs P0117 and P0118 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the ECT Sensor parameter. The reading should be between 37-139°C (-35 to +282°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.

1. Ignition OFF, disconnect the harness connector at the ECT sensor.
2. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, verify the scan tool ECT parameter is less than -39°C (-38°F). If warmer than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
4. Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT parameter is warmer than 149°C (300°F). If colder than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
5. If all circuits test normal, test or replace the ECT sensor.

Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance table.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Engine Coolant Temperature Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
2. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

TP Sensor 1

TP Sensor 2

The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the TP sensors with a common 5-volt reference circuit, a common low reference circuit, and two independent signal circuits.

P0120, P0122, P0123, P0220, P0222, and P0223

1. DTC P0601, P0602, P0603, P0604, P0606, P0607, P0641, or P0651 is not set.
2. The system voltage is greater than 5.23 V.
3. The ignition is in the Unlock/Accessory or Run position.
4. The DTCs run continuously when the above conditions are met.

P2135

1. DTCs P0120, P0220, P0641, or P0651 are not set.
2. The system voltage is greater than 5.23 V.
3. The ignition is in the Unlock/Accessory or Run position.
4. The DTC runs continuously when the above conditions are met.

P0120

TP sensor 1 voltage is less than 0.325 volt or greater than 4.75 V for greater than 1 s.

P0122

The ECM detects that the TP sensor 1 voltage is less than 0.325 volt for greater than 1 s.

P0123

The ECM detects that the TP sensor 1 voltage is greater than 4.75 V for greater than 1 s.

P0220

The TP sensor 2 voltage is less than 0.25 volt or greater than 4.59 V for greater than 1 s.

P0222

The ECM detects that the TP sensor 2 voltage is less than 0.25 volt for greater than 1 s.

P0223

The ECM detects that the TP sensor 2 voltage is greater than 4.59 V for greater than 1 s.

P2135

The difference between the TP sensor 1 and TP sensor 2 exceeds a predetermined value for greater than 2 s.

1. DTCs P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.
2. The ECM commands the TAC system to operate in the Reduced Engine Power mode.
3. A message center or an indicator displays Reduced Engine Power.
4. Under certain conditions the ECM commands the engine OFF.

DTCs P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.

1. If the Throttle Sweep Test is not available on the scan tool, observe the scan tool TP Sensor 1 and 2 Agree/Disagree parameter while performing the following tests: Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times. Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure several times. The TP Sensor 1 and 2 Agree/Disagree parameter should display Agree. If Disagree is displayed, continue diagnosis in Circuit/System Testing.
2. A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC to set.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Description and Operation

Throttle Actuator Control (TAC) System Description

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0641 or P0651 are not set. If a DTC is set, refer to «DTC P0641 or P0651»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-dtc-p0341-through-dtc-p2544) for further diagnosis.
2. Observe the TP sensor 1 and 2 voltage parameters. Both parameters should be between 1.0-4.0 V and change with accelerator pedal input.
3. Perform the Throttle Sweep Test while observing the TP Sensor 1 and 2 Agree/Disagree parameter with a scan tool. The TP Sensor 1 and 2 Agree/Disagree parameter should display Agree.
4. Clear the DTCs with the scan tool. Operate the vehicle within the Conditions for Running the DTC or within the conditions that you observed from the Freeze Frame/Failure Records.
5. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0120 or P0220 are not the only TP sensor DTCs set If DTC P0120 or P0220 are the only DTCs set, replace the ECM.
6. 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.

1. Ignition OFF, disconnect the harness connector at the throttle body.
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 5 ohms between the low reference circuit terminal C and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 V between the 5-volt reference circuit terminals E and ground. If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Test for less than 0.1 V between the TP sensor 1 signal circuit terminal D and ground. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Test for 4.8-5.2 V between the TP sensor 2 signal circuit terminal F and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
6. Install a 3 A fused jumper wire between TP sensor 1 signal circuit terminal D and the 5-volt reference circuit terminal E. Verify the scan tool TP sensor 1 voltage parameter is greater than 4.8 V. If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
7. If all circuits test normal, test or replace the throttle body assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Throttle Body Assembly Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
2. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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 volts to the ECT sensor signal circuit and supplies a ground to the low reference circuit. The purpose of this diagnostic is to analyze the performance of the thermostat by using the ECT sensor to determine if the engine coolant will increase at the correct rate, and also meet the calibrated target temperatures under various operating conditions. The ECM uses the start-up ECT and the start-up intake air temperature (IAT) to begin the diagnostic calculation. The air flow into the engine is accumulated, and vehicle speed, distance, and engine run time are also factored in to determine if the ECT does increase normally and reach the calibrated target temperatures.

1. DTCs P0101, P0102, P0103, P0112, P0113, P0117, or P0118 are not set.
2. The start-up ECT is colder than 75°C (167°F).
3. The IAT Sensor parameter is warmer than -7°C (+19°F).
4. The engine run time is between 30-1,800 seconds.
5. The vehicle is driven greater than 0.8 kilometer (0.5 mile) at greater than 8 km/h (5 mph).
6. The DTC runs once per ignition cycle when the above conditions are met.

The ECM detects that the actual amount of accumulated air flow is greater than the predicted amount of accumulated air flow before the ECT reaches 80°C (176°F).

DTC P0128 is a Type B DTC.

DTC P0128 is a Type B DTC.

1. DTC P0128 occurring with insufficient vehicle interior heating is an indication of improper thermostat operation.
2. Inspect the ECT sensor terminals and the ECT harness connector for corrosion. This condition results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.
3. This diagnostic runs in a specific range. Measure and record the resistance of the ECT sensor at various ambient temperatures between -7 to +80°C (+19 to +176°F), then compare those measurements to the «Temperature Versus Resistance»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-specifications__temperature-versus-resistance) table.
4. 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.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, inspect the cooling system surge tank for the proper coolant level. Refer to «Cooling System Leak Testing»(/chevrolet/impala/ix-2006-2016/remont/cooling-system-mechanical/#engine-cooling-system) and «Cooling System Draining and Filling (9C1, 9C3 Static Fill)»(/chevrolet/impala/ix-2006-2016/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (LZE, LGD Static Fill)»(/chevrolet/impala/ix-2006-2016/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (LZE, LGD GE47716 Fill)»(/chevrolet/impala/ix-2006-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Ignition OFF for 8 hours or greater.
3. Ignition ON, observe the scan tool IAT Sensor and ECT Sensor parameters. The ECT, IAT, and ambient temperatures should be within 15°C (27°F) of each other.
4. Use the scan tool to verify the proper operation of the engine cooling system fans.
5. Verify the proper heat range and the operation of the thermostat. Refer to «Thermostat Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
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.

1. Ignition OFF, disconnect the harness connector at the ECT sensor.
2. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F). If warmer than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
4. Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT Sensor parameter is warmer than 149°C (300°F). If colder than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
5. If all circuits test normal, test or replace the ECT sensor.

Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance table.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Engine Coolant Temperature Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
2. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

HO2S Sensor 1

HO2S Sensor 2

HO2S Sensor 1

HO2S Sensor 2

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. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The control module supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started, the control module operates in Open Loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature and Closed Loop is achieved, the HO2S generates a voltage within a range of 0-1,000 mV that fluctuates above and below bias voltage. High HO2S voltage indicates a rich exhaust stream. Low HO2S voltage indicates a lean exhaust stream.

P0131 and P0137

1. DTCs P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
2. The system voltage is between 10-18V.
3. The scan tool special functions are not active
4. The Air Fuel Ratio parameter is between 0.9-1.1.
5. The TP Indicated Angle parameter is between 3-45 percent.
6. The Loop Status parameter is closed.
7. The ECT parameter is less than 131°C (268°F).
8. All fuel injectors are ON.
9. The traction control is not active.

P0132 and P0138

1. DTCs P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
2. The system voltage is between 10-18V.
3. The scan tool special functions are not active.
4. The TP Indicated Angle parameter is between 3-45 percent.
5. The Air Fuel Ratio parameter is between 0.9-1.1.
6. The above conditions must be met for at least 3 seconds.

P0131

1. The control module detects that the HO2S 1 signal voltage is less than 50 mV for more than 25 seconds.
2. This diagnostic runs continuously.

P0132

1. The control module detects that the HO2S 1 signal voltage is more than 1,050 mV for more than 20 seconds.
2. This diagnostic runs continuously.

P0137

1. The control module detects that the HO2S 2 signal voltage remains below 50 mV for more than 120 seconds.
2. This diagnostic runs continuously.

P0138

1. The HO2S 2 voltage is more than 1,050 mV for longer than 96 seconds.
2. This diagnostic runs continuously.

DTCs P0131, P0132, P0137, and P0138 are Type B DTCs.

DTCs P0131, P0132, P0137, and P0138 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
5. «Heated Oxygen Sensor Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__heated-oxygen-sensor-wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. If any HO2S heater DTCs are set, perform those diagnostics first.
2. Allow the engine to reach operating temperature.
3. Engine running, observe the affected HO2S parameter with a scan tool. The pre-catalyst oxygen sensor value should vary from below 200 mV to above 800 mV and respond to fueling changes. The post-catalyst oxygen sensor value should change more than 200 mV when the throttle is quickly cycled 3 times from closed to wide open and back to closed after running the engine at 1,500 RPM for 30 seconds.
4. The affected HO2S may be damaged due to contamination. Prior to replacing the affected HO2S, inspect for the following sources of contamination: CAUTION: Refer to «Silicon Contamination of Heated Oxygen Sensors Caution»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#dangers-warnings-and-cautions__silicon-contamination-of-heated-oxygen-sensors) . A silicon contaminated HO2S Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) Engine oil consumption-Refer to «Oil Consumption Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-35l-diagnostic-information-and-procedures__oil-consumption-diagnosis) . Engine coolant consumption-Refer to «Loss of Coolant»(/chevrolet/impala/ix-2006-2016/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) .
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.

Note. All modules must be powered down or misdiagnosis may result.

1. Ignition OFF, disconnect the scan tool and wait 60 seconds to ensure all modules are powered down.
2. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
3. Ignition OFF, measure for less than 5 ohms between the appropriate HO2S low signal circuit terminal A and ground. If more than the specified range, test the appropriate HO2S low signal circuit for an open/high resistance. If the circuit tests normal, replace the engine control module (ECM).
4. Ignition ON, verify the appropriate scan tool HO2S parameter is approximately 450 mV. If more than the specified value, test the appropriate HO2S high signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. If less than the specified value, test the appropriate HO2S high signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
5. Ignition ON, install a 3A fused jumper wire at the HO2S high signal circuit terminal B. Toggle the jumper wire between the HO2S low signal circuit terminal A and the battery voltage. Verify the appropriate scan tool HO2S parameter toggles between 0 mV and approximately 1,000 mV. If the appropriate scan tool HO2S parameter does not toggle correctly, test the HO2S high signal circuit for an open/high resistance. If the circuits test normal, replace the ECM.
6. If all circuits test normal, replace the appropriate HO2S.

Note. For DTC P0131 and P0132, in order to ensure that the performance of the catalyst has not been affected by the fault that set this DTC, operate the vehicle within the Conditions for Running and Setting DTC P0420 and verify that P0420 runs and passes. Refer to DTC P0420 .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Heated Oxygen Sensor Replacement - Sensor 1»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
2. «Heated Oxygen Sensor Replacement - Sensor 2»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
3. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

HO2S Sensor 1

HO2S Sensor 2

HO2S Sensor 1

HO2S Sensor 2

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. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The engine control module (ECM) supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started, the operates in Open Loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature and Closed Loop is achieved, the HO2S generates a voltage within a range of 0-1,000 mV that fluctuates above and below bias voltage. High HO2S voltage indicates a rich exhaust stream. Low HO2S voltage indicates a lean exhaust stream.

P0133

1. DTCs P0030, P0053, P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0131, P0132, P0134, P0135, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0451, P0452, P0454, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
2. The system voltage is between 10-18 volts.
3. The scan tool special functions are not active.
4. The HO2S Sensor 1 Heater command parameter is ON.
5. The ECT sensor parameter is more than 65°C (149°F).
6. The Engine Run Time parameter is more than 60 seconds.
7. The vehicle is not in Park, Reverse, or Neutral.
8. The Loop Status parameter is closed.
9. The MAF sensor parameter is between 16-37 g/s.
10. The TP Indicated Angle parameter is more than 3.5 percent.
11. The Engine Speed parameter is between 1,300-2,550 RPM.
12. The evaporative emission (EVAP) system is purging.
13. The Barometric (BARO) parameter is at least 69.8 kPa.
14. The Fuel Alcohol Content parameter is less than 87 percent for 3.9L (RPO LGD), VIN code M, E85 compatible engines only.
15. The above conditions have been met for 3 seconds.

P0134

1. DTCs P0030, P0053, P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
2. The system voltage is between 10-18 volts.
3. The scan tool special functions are not active.
4. The HO2S Sensor 1 Heater command parameter is ON.
5. The Fuel Alcohol Content parameter is less than 87 percent for 3.9L (RPO LGD), VIN code M, E85 compatible engines only.
6. The Engine Run Time parameter is more than 2 minutes.

P0140 - Regular Test

1. DTCs P0036, P0054, P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
2. The system voltage is between 10-18 volts.
3. The scan tool special functions are not active.
4. The Engine Run Time parameter is more than 2 minutes.
5. The TP Indicated Angle parameter has changed more than 3 percent at least 1 time.
6. The Fuel Alcohol Content parameter is more than 87 percent for 3.9L (RPO LGD), VIN code M, E85 compatible engines only.
7. The Loop Status parameter is closed.

P0140 - Fast Pass Test

1. DTCs P0036, P0054, P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
2. The system voltage is between 10-18 volts.
3. The Fuel Alcohol Content parameter is more than 87 percent for 3.9L (RPO LGD), VIN code M, E85 compatible engines only.
4. The scan tool special functions are not active.
5. The Engine Run Time parameter is less than 90 seconds.

P1133

1. DTCs P0030, P0053, P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0131, P0132, P0134, P0135, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0451, P0452, P0454, P0455, P0496, P1516, P2101, P2119, P2135, P2176, P2A00 are not set.
2. The system voltage is between 10-18 volts.
3. The scan tool special functions are not active.
4. The HO2S Sensor 1 Heater command parameter is ON.
5. The ECT Sensor parameter is more than 65°C (149°F).
6. The Engine Run Time parameter is at least 60 seconds.
7. The EVAP purge solenoid is commanded ON.
8. The MAF sensor parameter is between 16-37 g/s.
9. The Engine Speed parameter is between 1,300-2,550 RPM.
10. The TP Indicated Angle parameter is greater than 3.5 percent.
11. The Loop Status parameter is closed.
12. The Fuel Alcohol Content parameter is less than 87 percent for 3.9L (RPO LGD), VIN code M, E85 compatible engines only.
13. The BARO parameter is at least 69.8 kPa.
14. The vehicle is not in Park, Reverse, or Neutral.
15. The above conditions have been met for 1 second.

P2270

1. DTCs P0030, P0053, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0131, P0132, P0133, P0134, P0135, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0453, P0454, P0455, P0496, P1133, P1516, P2101, P2119, P2135, P2176, P2271, P2A00 are not set.
2. The system voltage is between 10-18V.
3. The learned heater resistance is valid.
4. The ICAT MAT Burnoff delay is not active.
5. The Green O2 Sensor Condition is not present.
6. The fuel level is more than 10 percent or the fuel level data fault is active.
7. Engine run time is equal to or more than 40 seconds.

THEN

1. The engine speed is between 1,100-2,100 RPM.
2. Airflow is equal to or more than 3 g/s and equal to or less than 12 g/s.
3. The vehicle speed is equal to or more than 73 km/h (45.4 mph) and equal to or less than 120 km/h (74.6 mph).
4. The short term fuel trim is equal to or more than 0.9 and equal to or less than 1.065.
5. The fuel state is in closed loop.
6. The EVAP diagnostics are not in control of purge.
7. The Post Cell Enabled
8. The EGR diagnostic is not intrusive.
9. The Heater Warm-up Delay is more than 120 seconds.
10. The catalytic converter temperature is equal to or more that 650°C (1,202°F), and equal to less than 900°C (1,652°F).
11. This DTC runs once per trip when all of the above conditions have been met for 2 seconds.

P2271

1. DTCs P0030, P0053, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0131, P0132, P0133, P0134, P0135, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0453, P0454, P0455, P0496, P1133, P1516, P2101, P2119, P2135, P2176, P2270, or P2A00 are not set.
2. The system voltage is between 10-18V.
3. The learned heater resistance is valid.
4. The ICAT MAT Burn-off delay is not active.
5. The Green O2 Sensor Condition is not present.
6. The fuel level is more than 10 percent or the fuel level data fault is active.
7. Engine run time is equal to or more than 40 seconds.

THEN

1. DFCO is active.
2. APP is stable.
3. TCC is locked.
4. DTC P2270 has run and passed.
5. This DTC runs once per trip.

P2A00

1. DTCs P0030, P0053, P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0131, P0132, P0133, P0134, P0135, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1133, P1516, P2101, P2119, P2120, P2122, P2123, P2135, P2176 are not set.
2. The Engine Run Time parameter is more than 100 seconds.
3. The MAF Sensor parameter is between 5-37 g/s.
4. The Engine Speed parameter is between 500-3,000 RPM.
5. The ECT Sensor parameter is more than 75°C (167°F).
6. The Ignition 1 Signal parameter is between 10-18 volts.
7. DTC P2A00 runs continuously when the above conditions are met for 5 seconds.

P0133

1. The ECM detects that the HO2S 1 rich-to-lean and lean-to-rich transition time takes longer than a calibrated value.
2. This diagnostic runs once per trip.

P0134

1. The ECM detects that the HO2S 1 signal voltage is between 380-525 mV for more than 30 seconds.
2. This diagnostic runs continuously.

P0140 - Fast Pass Test

During the fast pass, the HO2S 2 voltage is between 350-550 mV for longer than 18 seconds within the first 90 seconds of engine run time. If the fast pass test does not report a pass, then the regular test is initiated.

P0140 - Regular Test

1. During the regular test, the HO2S 2 voltage is between 380-525 mV for at least 120 seconds.
2. This diagnostic runs once per trip.

P1133

1. The ECM detects that the HO2S 1 voltage did not have enough switches from rich-to-lean and lean-to-rich during a 90 second monitoring period.
2. This diagnostic runs once per trip.

P2270

1. The ECM detects that the O2 sensor cannot achieve voltage equal to or more than 775 mV. AND
2. The ECM detects that the accumulated mass air flow monitored during the Stuck Lean Voltage Test is more than 45 grams.

P2271

1. The ECM detects that the O2 sensor cannot achieve voltage equal to or less than 100 mV. AND
2. The ECM detects that the accumulated mass air flow monitored during the Stuck Rich Voltage Test is more than 20 grams.

P2A00

1. The ECM detects that the HO2S 1 voltage signal remains within the 325-520 mV range for more than 30 seconds.
2. This diagnostic runs continuously.

DTCs P0133, P0134, P0140, P1133, P2270, P2271, and P2A00 are Type B DTCs.

DTCs P0133, P0134, P0140, P1133, P2270, P2271, and P2A00 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
5. «Heated Oxygen Sensor Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__heated-oxygen-sensor-wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

1. If any HO2S heater DTCs are set, perform those diagnostics first.
2. Allow the engine to reach operating temperature.
3. Engine running, observe the affected HO2S parameter with a scan tool. The pre-catalyst oxygen sensor value should vary from below 200 mV to above 800 mV and respond to fueling changes. The post-catalyst oxygen sensor value should change more than 200 mV when the throttle is quickly cycled 3 times from closed to wide open and back to closed after running the engine at 1,500 RPM for 30 seconds.
4. The affected HO2S may be damaged due to contamination. Prior to replacing the affected HO2S, inspect for the following sources of contamination. CAUTION: Refer to «Silicon Contamination of Heated Oxygen Sensors Caution»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#dangers-warnings-and-cautions__silicon-contamination-of-heated-oxygen-sensors) . A silicon contaminated HO2S Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) Engine oil consumption-Refer to «Oil Consumption Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-35l-diagnostic-information-and-procedures__oil-consumption-diagnosis) Engine coolant consumption-Refer to «Loss of Coolant»(/chevrolet/impala/ix-2006-2016/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant)
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.

Note. All modules must be powered down or misdiagnosis may result.

1. Ignition OFF, disconnect the scan tool and wait 60 seconds to ensure all modules are powered down.
2. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
3. Ignition OFF, measure for less than 5 ohms resistance between the appropriate HO2S low signal circuit terminal A and ground. If more than the specified range, test the appropriate HO2S low signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
4. Ignition ON, verify the appropriate scan tool HO2S parameter is approximately 450 mV. If more than the specified value, test the appropriate HO2S high signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. If less than the specified value, test the appropriate HO2S high signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
5. Ignition ON, install a 3A fused jumper wire at the HO2S high signal circuit terminal B. Toggle the jumper wire between the HO2S low signal circuit terminal A and battery voltage. Verify the appropriate scan tool HO2S parameter toggles between 0 mV and approximately 1,000 mV. If the appropriate scan tool HO2S parameter does not toggle correctly, test the HO2S high signal circuit for an open/high resistance. If the circuits test normal, replace the ECM.
6. If all circuits test normal, replace the appropriate HO2S.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Heated Oxygen Sensor Replacement - Sensor 1»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
2. «Heated Oxygen Sensor Replacement - Sensor 2»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions)
3. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/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 the 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 (FT) values. The short term FT values change rapidly in response to the HO2S voltage signals. These changes fine tune the engine fueling. The long term FT makes coarse adjustments in order to maintain an optimum air/fuel ratio. The ideal FT values are around zero percent. A positive FT value indicates that the ECM is adding fuel in order to compensate for a lean condition. A negative FT value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition.

1. DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0201-P0206, P0300, P0301-P0306, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P0506, P0507 are not set.
2. The engine is in Closed Loop status.
3. The catalyst monitor intrusive test is not active.
4. The post O2 sensor intrusive test is not active.
5. The device controls are not active.
6. The EVAP tank pull down test is not active.
7. The engine coolant temperature (ECT) is between -38 and +130°C (-36 and +266°F).
8. The intake air temperature (IAT) is between -20 and +150°C (-4 and +302°F).
9. The manifold absolute pressure (MAP) is between 15-256 kPa (2.2-37.1 PSI).
10. The engine speed is between 400-6,350 RPM.
11. The mass air flow (MAF) is between 1-512 g/s.
12. The barometric pressure (BARO) is more than 70 kPa (10.2 PSI).
13. The fuel level is greater than 10 percent.
14. These DTCs run continuously when the above conditions have been met.

1. The long term FT weighted average value is more or less than a calibrated value.
2. The above condition is present for approximately 3 minutes 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. Over-estimation of the ethanol content will result in a rich shift of fuel trim values, and under-estimation will result in a lean shift of fuel trim values. A fuel trim DTC may set if the learned alcohol content, Fuel Alcohol Content parameter on the scan tool, is different than the measured alcohol content in the vehicle such that fuel trim values exceed failure threshold values. Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) .
2. The normal Short Term FT parameter should be between +10 percent and -10 percent, with near 0 percent the optimum, with the engine running at operating temperature.
3. The Long Term FT parameter should be between +10 percent and -10 percent, with near 0 percent the optimum, with the engine running at operating temperature.
4. Certain aftermarket air filters may cause a DTC to set.
5. Certain aftermarket air induction systems or modifications to the air induction system may cause a DTC to set.
6. Certain aftermarket exhaust system components may cause a DTC to set.

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Verify that other DTCs are not set. If any other DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Ignition ON, engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should be within the range specified for your altitude. Refer to «Altitude Versus Barometric Pressure»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-specifications__altitude-versus-barometric-pressure) . If the MAP sensor does not indicate the correct barometric pressure, refer to «DTC P0106»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-dtc-p0010-through-dtc-p0340) .
3. With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be between 2-6 g/s at idle. If the MAF sensor parameter is not between 2-6 g/s at idle, refer to «DTC P0101 or P1101»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-dtc-p0010-through-dtc-p0340) or «DTC P0102 or P0103»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-dtc-p0010-through-dtc-p0340) .

P0171

Note. EVAP purge enablement may cause the FT to be momentarily outside the normal range.

Allow the engine to reach operating temperature. With the engine running, observe the Long Term FT parameter with a scan tool. The reading should be between 0-20 percent.

1. If greater than the specified range, inspect for the following

1. Vacuum hoses for splits, kinks, and improper connections
2. Insufficient fuel in the tank
3. Low fuel pressure-Refer to «Fuel System Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) .
4. Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) .
5. Malfunctioning fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) .
6. Missing, loose, or leaking exhaust components from the HO2S forward-Refer to «Symptoms - Engine Exhaust»(/chevrolet/impala/ix-2006-2016/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) .
7. Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
8. The air induction system and the air intake ducts for leaks or for a missing air filter element
9. A cracked EVAP canister
10. Evaporative pipes obstructed or leaking
11. The crankcase ventilation system for leaks-Refer to «Crankcase Ventilation System Inspection/Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-diagnostic-information-and-procedures__crankcase-ventilation-system-inspectiondiagnosis) .
12. The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
13. The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
14. Malfunctioning engine components-Refer to «Symptoms - Engine Mechanical»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-diagnostic-information-and-procedures) .

P0172

Note. EVAP purge enablement may cause the FT to be momentarily outside the normal range.

Allow the engine to reach operating temperature. With the engine running, observe the Long Term FT parameter with a scan tool. The reading should be between -20 and 0 percent.

1. If less than the specified range, inspect for the following

1. Vacuum hoses for splits, kinks, and improper connections
2. The air intake duct for being collapsed or restricted
3. The air filter for being dirty or restricted
4. Objects blocking the throttle body
5. Excessive fuel in the crankcase due to leaking fuel injectors
6. The EVAP control system for improper operation
7. Excessive fuel pressure-Refer to «Fuel System Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) .
8. Malfunctioning fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) .
9. Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) .
10. The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
11. The HO2S signal circuit shorted to voltage
12. Malfunctioning engine components-Refer to «Symptoms - Engine Mechanical»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-diagnostic-information-and-procedures) .

Perform the Diagnostic Repair Verification after performing the diagnostic procedure.

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/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) enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The ECM controls each fuel injector by grounding the control circuit via a solid state device called a driver. The ECM monitors the status of each driver. If the ECM detects an incorrect voltage for the commanded state of the driver, a fuel injector control circuit DTC sets.

1. The engine is running.
2. The ignition voltage is more than 11 V for 5 seconds.
3. DTC P0201-P0206 runs continuously when the above conditions are met.

1. The ECM detects an incorrect voltage on the fuel injector control circuit.
2. The above condition is met for 1 second.

DTC P0201-P0206 are Type B DTCs.

DTC P0201-P0206 are Type B DTCs.

Performing the Fuel Injector Solenoid Coil Test may help isolate an intermittent condition. Refer to Fuel Injector Solenoid Coil Test .

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 35616-200: Test Light Probe Kit

1. Engine idling, observe the following control circuit status parameters for each fuel injector: Injector Ckt Short Gnd Test Status Injector Ckt Open Test Status Injector Ckt Short Volts Test Status
2. Engine running, observe the DTC information with a scan tool. DTC P0201, P0202, P0203, P0204, P0205, or P0206 should not set.
3. 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.

1. Ignition OFF, disconnect the X102 fuel injector multi-way connector.
2. Ignition ON, verify that the J 35616-200: Test Light illuminates between the ignition circuit terminal A ECM harness side and ground If the test lamp does not illuminate, test the ignition circuit for a short to ground, or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the fuel injector.
3. Ignition OFF, connect the J 35616-200: Test Light between the ignition circuit terminal A and the control circuit ECM harness side, of the appropriate injector listed below: Injector 1 terminal C Injector 2 terminal D Injector 3 terminal E Injector 4 terminal F Injector 5 terminal G Injector 6 terminal H
4. Engine cranking, the test lamp should flash for each injector. If the test lamp is always ON, test the appropriate control circuit for a short to ground. If the circuit tests normal, replace the ECM. If the test lamp is always OFF, test the appropriate control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
5. Ignition OFF, measure for 10-15 ohms on the engine harness side of X102 between the ignition circuit terminal A and the control circuit of the appropriate injector listed below: Injector 1 terminal C Injector 2 terminal D Injector 3 terminal E Injector 4 terminal F Injector 5 terminal G Injector 6 terminal H If the resistance is not within the specified range, test for a short to ground or an open/high resistance between X102 and the appropriate fuel injector harness connector. If the circuits test normal, test or replace the affected fuel injector.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
2. «Fuel Injector Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic procedure.
3. «Diagnostic Procedure Instructions»(/chevrolet/impala/ix-2006-2016/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) enables the fuel pump relay when the ignition switch is turned ON. The ECM will disable the fuel pump relay within 2 seconds unless the ECM detects ignition reference pulses. The ECM continues to enable the fuel pump relay as long as ignition reference pulses are detected. The ECM disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON.

The ECM monitors the voltage on the fuel pump relay control circuit. If the ECM detects an incorrect voltage on the fuel pump relay control circuit, a fuel pump relay control DTC sets.

1. The ignition voltage is between 9-18 V.
2. DTC P0230 runs continuously once the above condition is met.

1. The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match.
2. The above condition is met for a minimum of 2.5 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 43244: Relay Puller Pliers

Ignition ON, command the fuel pump relay ON and OFF with a scan tool while observing the following control circuit status parameters

1. Fuel Pump Relay Ckt Short Gnd Test Status
2. Fuel Pump Relay Ckt Open Test Status
3. Fuel Pump Relay Ckt Short Volts Test Status

Each parameter should toggle between OK and Not Run or Not Run and OK.

1. Ignition OFF, disconnect the fuel pump relay using the J 43244: Pliers.
2. Ignition ON, verify that a test lamp illuminates between the ground circuit terminal 85 and B+. If the test lamp does not illuminate, test the ground circuit for a short to voltage or an open/high resistance.
3. Verify that a test lamp does not illuminate between the ground circuit terminal 85 and the control circuit terminal 86. If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Remove the test lamp.
5. Command the fuel pump relay ON with a scan tool. Verify the scan tool Fuel Pump Relay Ckt Short Gnd Test Status parameter is OK. If not the specified value, test the fuel pump relay control circuit for a short to ground. If the circuit tests normal, replace the ECM.
6. Install a 3A fused jumper wire between the fuel pump relay control circuit terminal 86 and the ground circuit terminal 85. Command the fuel pump ON with a scan tool. Verify the scan tool Fuel Pump Relay Ckt Short Gnd Test Status parameter is Fault. If not the specified value, test the fuel pump relay control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
7. If all circuits test normal, test or replace the fuel pump relay.

1. Test for 70-110 ohms between terminals 85 and 86. If the resistance is not within the specified range, replace the fuel pump relay.
2. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the fuel pump relay.
3. Install a 15 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87. If greater than the specified range, replace the fuel pump relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/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 in order to determine when an engine misfire is occurring, and uses information from the camshaft position sensor in order to determine which cylinder is misfiring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM is able to detect individual misfire events. If the ECM detects a misfire rate sufficient to cause the emission levels to exceed mandated standards, DTC P0300 sets. Under certain driving conditions, a misfire rate can be high enough to cause the 3-way catalytic converter to overheat, possibly damaging the converter. The malfunction indicator lamp (MIL) will flash ON and OFF when converting overheating, damaging conditions are present and DTC P0300 is set.

DTCs P0301-P0306 correspond to cylinders 1-6. If the ECM is able to determine that a specific cylinder is misfiring, the DTC for that cylinder may also set.

1. DTCs P0016, P0101, P0102, P0103, P0107, P0108, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0220, P0222, P0223, P0335, P0336, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2135, or P2138 are not set.
2. DTC P0315 is not set and the engine speed is between 525-6,000 RPM. OR
3. DTC P0315 is set and the engine speed is less than 1,000 RPM.
4. The ignition voltage is between 9-18 V.
5. The engine coolant temperature (ECT) parameter is between -7 and +126°C (+19 and +259°F).
6. If the ECT is less than -7°C (+19°F) at engine start-up, this diagnostic is disabled until the ECT is more than +21°C (+70°F).
7. The fuel level is more than 10 percent.
8. The antilock brake system (ABS) and the traction control system are not active or detecting rough road.
9. The ECM is not in fuel shut-off or diesel fuel cut-off mode.
10. The power management is not active.
11. Excessive drive wheel slip is not detected.
12. DTC P0300 runs continuously when the above conditions are met.

The ECM is detecting a crankshaft rotation speed variation indicating a misfire sufficient to cause emission or catalytic converter damaging levels to exceed mandated standards.

1. DTCs P0300-P0306 are Type B DTCs.
2. When the MIL is flashing, the injector may be disabled for the misfiring cylinder to protect the catalytic converter.
3. Depending on the conditions that set the code, the engine may go into Open Loop.

1. DTCs P0300-P0306 are Type B DTCs.
2. The DTC must pass under the same conditions that were present when the DTC failed.

A misfire may only occur when the engine is under a load or when the engine is cold. A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect for the following possible sources

1. A tire or wheel that is out of round or out of balance
2. Variable thickness brake rotors
3. An unbalanced drive shaft
4. Certain rough road conditions
5. A damaged accessory drive component or belt
6. A damaged reluctor wheel
7. The Crankshaft Position System Variation Learn Procedure may need to be performed. Refer to «Crankshaft Position System Variation Learn»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions__crankshaft-position-system-variation-learn) .
8. The 3.9L, RPO LGD, VIN code M, E85 compatible engines only- May use either American Society for Testing and Materials (ASTM) gasoline with 10 percent or less ethanol content or unleaded fuel containing 85 percent ethanol, or ASTM E85. Refer to «Fuel System Description»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-description-and-operation) .
9. The 3.9L, RPO LGD, VIN code M, E85 compatible engines only-Over estimation of the ethanol content will result in a rich shift of fuel trim values and under estimation will result in a lean shift of fuel trim values. A misfire DTC may set if the learned alcohol content, Fuel Alcohol Content parameter, on the scan tool is different than the measured alcohol content in the vehicle, such as that values exceed failure threshold values. Refer to «Fuel Composition Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) .

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 26792: Spark Tester

1. Verify that no other DTCs are set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Engine idling, verify there is no abnormal engine noise. If there is an abnormal engine noise, refer to «Symptoms - Engine Mechanical»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-diagnostic-information-and-procedures) .
3. Observe the Misfire Current Counters with a scan tool. The Misfire Current Counters should not be incrementing. Random misfires that are not steadily incrementing may be normal.
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.

1. Verify that the following conditions do not exist: The fuel injector wire harness electrical connectors are connected to the improper fuel injectors. Refer to «Engine Controls Schematics»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-wiring-schematic-diagrams) . Engine vacuum leaks Fuel pressure that is too low or too high-Refer to «Fuel System Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) . Contaminated fuel-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) . Restricted exhaust system-Refer to «Restricted Exhaust»(/chevrolet/impala/ix-2006-2016/remont/exhaust/#engine-exhaust-system) . If you find any of the above conditions, repair as necessary.
2. Ignition OFF, remove the spark plug wire from the spark plug and ignition coil. Inspect and test the spark plug wire for arching, cuts, rubbing on other components, and proper resistance. Refer to «Spark Plug Wire Inspection»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions__spark-plug-wire-inspection) and «Ignition System Specifications»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-specifications__ignition-system-specifications) . If a fault is found, replace the spark plug wire. Refer to «Spark Plug Wire Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions) .
3. Install the spark plug wire to the ignition coil.
4. Install the J 26792: Tester to the boot of the spark plug wire and ground.
5. Attempt to start the engine and observe the J 26792: Tester. The spark tester should spark. If there is no spark, refer to «Electronic Ignition System Diagnosis»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) for diagnosis of the ignition coil.
6. Ignition OFF, remove the spark plug from the misfiring cylinder. Verify that the following conditions do not exist with the spark plug: Gas, coolant, or oil fouled Cracked, worn, incorrectly gapped-Refer to «Spark Plug Inspection»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions__spark-plug-inspection) . If there is a condition with the spark plug, replace the spark plug.
7. Exchange the spark plug with another cylinder that is operating correctly.
8. Operate the engine under the conditions in which the misfire occurred. This may include putting the engine under a load, turning ON the A/C, seat heaters, and rear window defog. Observe the Misfire Current Counters with a scan tool. The misfire should not follow the spark plug exchange. If the misfire follows the spark plug, replace the spark plug.
9. If all conditions test normal, test or inspect for the following: A lean or rich fuel injector-Refer to «Fuel Injector Solenoid Coil Test»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis) . An engine mechanical condition-Refer to «Symptoms - Engine Mechanical»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-diagnostic-information-and-procedures) .

1. «Spark Plug Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
2. «Spark Plug Wire Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)

Repair Verification

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 seconds.
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 «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) and perform the appropriate diagnostic procedure.
6. 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»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-dtc-p0341-through-dtc-p2544) .

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0315: Crankshaft Position System Variation Not Learned

The crankshaft position system 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.

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 seconds. If the actual crankshaft position 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.

The diagnostic runs continuously.

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.

Schematic Reference

Engine Controls Schematics

Connector End Views

Component Connector End Views -- Index

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Note. The Crankshaft Position System Variation Learn Procedure may have to be repeated up to 5 times before the procedure is successful.

1. Perform the «Crankshaft Position System Variation Learn»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions__crankshaft-position-system-variation-learn) . The scan tool should display Learned this Ignition.
2. If the Crankshaft Position System Variation Learn Procedure cannot be performed successfully, inspect for the following conditions: Worn crankshaft main bearings A damaged or misaligned reluctor wheel Excessive crankshaft runout A damaged crankshaft-Refer to «Crankshaft and Bearing Cleaning and Inspection»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-repair-instructions-off-vehicle-1-of-3) . Interference in the signal circuit of the crankshaft position sensor The ignition switch is in the ON position until there is insufficient system voltage. An ECM power disconnect with the ignition ON that may have erased the crankshaft position system variation values and set DTC P0315 Debris between the crankshaft position sensor and the reluctor wheel If the control module is unable to complete the learn procedure, replace the control module.

Perform the Diagnostic Repair Verification prior to using this diagnostic procedure.

Control Module References for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The knock sensor system enables 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 sensors are located below each cylinder head on the engine block. The knock sensor produces an 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 knock sensor signal. The ECM receives the knock sensor signal through 2 isolated signal circuits. The ECM learns a minimum knock sensor noise level at idle and uses calibrated values for the rest of the RPM range. The ECM should monitor a normal knock sensor signal within the noise channel.

P0325, P0330, and P0326

1. Engine speed is greater than 1,800 RPM.
2. MAP is greater than 55 kPa.
3. The DTCs run continuously when the above conditions are met.

P0324, P0327, P0328, P0332, and P0333

1. The ignition is ON.
2. The DTCs run continuously when the above condition is met.

P0324

The ECM has detected an internal circuitry fault.

P0325 and P0330

The knock sensor signal circuits are open or shorted together for 5 s.

P0326

1. The knock sensor signal indicates an excessive engine knock is present.
2. The ECM has commanded the spark retard to a value, which is greater than the calibrated value, for a specific engine load and speed.
3. The above conditions exist for greater than 5 s.

P0327, P0328, P0332, and P0333

The knock sensor signal circuits are shorted to voltage or ground.

1. DTC P0324 is a Type A DTC.
2. DTCs P0325, P0326, P0327, P0328, P0330, P0332 and P0333 are Type B DTCs.

1. DTC P0324 is a Type A DTC.
2. DTCs P0325, P0326, P0327, P0328, P0330, P0332 and P0333 are Type B DTCs.

1. Inspect the knock sensor for physical damage. A knock sensor that is dropped or damaged may cause a DTC to set.
2. Inspect the knock sensor for proper installation. A knock sensor that is loose or over torqued may cause a DTC to set. The knock sensor should be free of thread sealant.
3. The knock sensor mounting surface should be free of burrs, casting flash, and foreign material.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

P0324

1. Verify that the following DTCs are not set: DTC P0325, P0327, P0328, P0330, P0332 and P0333. If any of the DTCs are set, diagnose them first.
2. This DTC indicates an internal ECM circuitry failure. Replace the K20 ECM.

P0325, P0327, P0328, P0330, P0332, P0333

1. Ignition ON, engine OFF.
2. Disconnect the B68 knock sensor harness connector.
3. Measure for 2-5 V between each of the following circuits and ground on the ECM side of the harness connector: The B68 knock sensor signal circuit, terminal A The B68 knock sensor signal circuit, terminal B If less than the specified range, test the circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the K20 ECM. If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the K20 ECM.
4. If the circuits test normal, replace the B68 knock sensor.

P0326

1. If DTCs P0335 or P0336 are also set, diagnose those DTCs first.
2. Inspect for a loose or broken vehicle accessory or accessory bracket.
3. Inspect for excessive engine mechanical noise.

1. Connect the DMM between the B68 knock sensor signal circuit terminal A and the B68 knock sensor signal circuit terminal B on the sensor side of the B68 knock sensor harness connector.
2. Set the DMM to the 400 mV AC hertz scale and wait for the DMM to stabilize at 0 Hz.
3. Tap on the engine block with a non-metallic object near the B68 knock sensor while observing the signal indicated on the DMM.
4. The DMM should display a fluctuating frequency while tapping on the engine block.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Knock Sensor Replacement - Bank 1»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
2. «Knock Sensor Replacement - Bank 2»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-repair-instructions)
3. «Symptoms - Engine Controls»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-39l-troubleshooting-diagnosis)
4. «Symptoms - Engine Mechanical»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-diagnostic-information-and-procedures)
5. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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.

1. DTC P0340, P0341, P0641 or P0651 is not set.
2. The engine is cranking or running.
3. The DTC runs continuously when the above conditions are met.

1. The ECM detects that the starter is commanded on and the engine has been cranking for more than 4 s without a crankshaft position sensor pulse.
2. The ECM detects that the engine has been running, but has not received a crankshaft position sensor pulse for 2 of 10 engine revolutions.

1. DTC P0335 is a Type B DTC.
2. The ignition system defaults to a limp home mode. The camshaft position sensor is used to determine engine position.

DTC P0335 is a Type B DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Description and Operation

Electronic Ignition System Description

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. With the ignition OFF, inspect the engine wiring harnesses carrying the camshaft position sensor circuits for the following conditions: Close routing of secondary ignition wires Close routing of aftermarket electrical equipment Close to solenoids, motors, and relays Correct any wire harness routing or component placement conditions, if it is determined to be a possible source of electrical interference.
2. Start the engine. Using the Live Plot function on the scan tool, select the camshaft position parameter. Change the minimum spec to 400 RPM, and the maximum spec to 4,000 RPM. Select the crankshaft position sensor parameter. Change the minimum spec to 600 RPM, and the maximum spec to 3,300 RPM.
3. Observe the scan tool.
4. Quickly accelerate and release the accelerator pedal several time. Do not exceed 3,200 RPM. The graphed lines on the Live Plot display should track together across the screen. If the vehicle passes the Circuit/System Verification test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records data list.

1. Ignition OFF, disconnect the crankshaft position sensor connector.
2. Test for less than 1 ohms between low reference circuit terminal B and ground. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground. If less than the specified range, test the 5 V reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. If greater than the specified value, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal C and ground. If less than the specified range, test signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. If greater than the specified range, test signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Ignition ON, engine OFF, using a jumper wire connected to ground, momentarily touch the crankshaft position sensor signal circuit terminal C at the harness connector repeatedly. The Crankshaft Position Active Counter parameter should increment. If the Crankshaft Position Active Counter parameter does not increment, replace the ECM. If the Crankshaft Position Active Counter increments, test or replace the crankshaft position sensor.

1. Inspect the crankshaft position sensor for looseness and correct installation. Remove the crankshaft position sensor from the engine and inspect the sensor and the O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, repair or replace the crankshaft position sensor.
2. Connect the crankshaft position sensor connector to the crankshaft position sensor; turn ON the ignition, with the engine OFF.
3. Observe the Crankshaft Position Active Counter parameter on the scan tool; pass a steel object by the tip of the sensor repeatedly. The Crankshaft Position Active Counter parameter should increment. If the parameter does not increment, replace the crankshaft position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
2. «Crankshaft Position Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions) for crankshaft position sensor replacement

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Engine Speed

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.

1. DTC P0340, P0341, P0641 or P0651 is not set.
2. The engine is cranking or running.
3. The DTC runs continuously when the above conditions are met.

1. The ECM detects that the engine is running, but receives less than 51 or more than 65 crankshaft position sensor pulses each engine revolution for 8 of 10 engine revolutions.
2. The ECM detects that the engine is running, but more than 19 resyncs occur within 25 s.
3. The ECM detects that the engine has been running, but the crankshaft does not sync for 0.4 s.

1. DTC P0336 is a Type B DTC.
2. The ignition system defaults to a limp home mode. The camshaft position sensor is used to determine engine position.

DTC P0336 is a Type B DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Description and Operation

Electronic Ignition System Description

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. With the ignition OFF, inspect the engine wiring harnesses carrying the camshaft position sensor circuits for the following conditions: Close routing of secondary ignition wires Close routing of aftermarket electrical equipment Close to solenoids, motors, and relays Correct any wire harness routing or component placement conditions, if it is determined to be a possible source of electrical interference.
2. Start the engine. Using the Live Plot function on the scan tool, select the camshaft position parameter. Change the minimum spec to 400 RPM, and the maximum spec to 4,000 RPM. Select the crankshaft position sensor parameter. Change the minimum spec to 600 RPM, and the maximum spec to 3,300 RPM.
3. Observe the scan tool.
4. Quickly accelerate and release the accelerator pedal several time. Do not exceed 3,200 RPM. The graphed lines on the Live Plot display should track together across the screen. If the vehicle passes the Circuit/System Verification test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records data list.

1. Ignition OFF, inspect the crankshaft position sensor for looseness and correct installation. If the sensor is loose, inspect the sensor and the O-ring for damage, replace as necessary
2. Inspect the engine for the following conditions: Engine oil for debris and contamination Crankshaft reluctor wheel for damage The timing chain, tensioner, and sprockets for wear or damage If debris is found in the engine oil, inspect the internal engine components to determine the cause. Repair or replace any worn or damaged components. Refer to «Camshaft Timing Chain and Sprocket Cleaning and Inspection»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-35l-repair-instructions-off-vehicle-1-of-3__camshaft-timing-chain-and-sprocket-cleaning) and «Crankshaft and Bearing Cleaning and Inspection»(/chevrolet/impala/ix-2006-2016/remont/mechanical/#engine-mechanical-39l-repair-instructions-off-vehicle-1-of-3) .

1. Inspect the crankshaft position sensor for looseness and correct installation. Remove the crankshaft position sensor from the engine and inspect the sensor and the O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, repair or replace the crankshaft position sensor.
2. Connect the crankshaft position sensor connector to the crankshaft position sensor; turn ON the ignition, with the engine OFF.
3. Observe the Crankshaft Position Active Counter parameter on the scan tool; pass a steel object by the tip of the sensor repeatedly. The Crankshaft Position Active Counter parameter should increment. If the parameter does not increment, replace the crankshaft position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
2. «Crankshaft Position Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions) for crankshaft position sensor replacement

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/impala/ix-2006-2016/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»(/chevrolet/impala/ix-2006-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Camshaft Position Sensor

The 4X camshaft position sensor circuits consist 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 also uses camshaft position sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home operation.

1. DTC P0335, P0336, P0641 or P0651 is not set.
2. The engine is cranking or running.
3. The DTCs run continuously when the above conditions are met.

1. The ECM detects that the starter is commanded on and the engine has been cranking for more than 4 s without a camshaft position sensor pulse. OR
2. The ECM detects that the engine has started, but did not received a camshaft position sensor pulse during the first engine revolution. OR
3. The ECM detects that the engine is running, but does not receive a camshaft position sensor pulse for 800 of 1,000 engine cycles.

1. DTC P0340 is a Type B DTC.
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.

DTC P0340 is a Type B DTC.

With a DTC set, the engine may crank for an extended period of time at start-up.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views -- Index

Description and Operation

Electronic Ignition System Description

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Wiring Repairs»(/chevrolet/impala/ix-2006-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. With the ignition OFF, inspect the engine wiring harnesses carrying the camshaft position sensor circuits for the following conditions: Close routing of secondary ignition wires Close routing of aftermarket electrical equipment Close to solenoids, motors, and relays Correct any wire harness routing or component placement conditions, if it is determined to be a possible source of electrical interference.
2. Start the engine. Using the Live Plot function on the scan tool, select the camshaft position parameter. Change the minimum spec to 400 RPM and the maximum spec to 4,000 RPM. Select the crankshaft position sensor parameter. Change the minimum spec to 600 RPM and the maximum spec to 3,300 RPM.
3. Observe the scan tool.
4. Quickly accelerate and release the accelerator pedal several times. Do not exceed 3,200 RPM. The graphed lines on the Live Plot display should track together across the screen. If the vehicle passes the Circuit/System Verification test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

1. Ignition OFF, disconnect the multi-way engine harness to fuel injector harness connector X102.
2. Test for less than 1 ohms between ECM side of the low reference circuit terminal P and ground. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 V between the ECM side of the 5 V reference circuit terminal N and ground. If less than the specified range, test the 5 V reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Ignition ON, test for 4.8-5.2 V between the ECM side of the signal circuit terminal R and ground. If less than the specified range, test the affected signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. If greater than the specified range, test the affected signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Ignition ON, using a jumper wire connected to ground, momentarily touch the camshaft position sensor signal circuit terminal R repeatedly. The camshaft position active counter parameter should increment. If the camshaft position active counter does not increment, replace the ECM.
6. Ignition OFF, inspect the wiring harness, from the multi-way connector to the camshaft position sensor, for any damage, opens, or shorts. If the circuits test normal replace the camshaft position sensor.

1. Inspect the camshaft position sensor for looseness and correct installation. Remove the camshaft position sensor from the engine and inspect the sensor and the O-ring for damage. If the sensor is loose, incorrectly installed, or damaged. Repair or replace the camshaft position sensor.
2. Connect the camshaft position sensor connector to the camshaft position sensor. Turn ON the ignition, with the engine OFF.
3. Ignition ON and engine OFF. Observe the Camshaft Position Active Counter parameter on the scan tool; pass a steel object by the tip of the sensor repeatedly. The Camshaft Position Active Counter parameter should increment. If the parameter does not increment, replace the camshaft position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Control Module References»(/chevrolet/impala/ix-2006-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
2. «Camshaft Position Sensor Replacement»(/chevrolet/impala/ix-2006-2016/remont/testing-diagnostics/#engine-controls-and-fuel-35l-repair-instructions) for camshaft position sensor replacement

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Engine Controls Schematics
• Component Connector End Views -- Index
• Camshaft Actuator System Description
• Lubrication Description
• Circuit Testing
• Connector Repairs
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Camshaft Position Actuator Magnet Replacement
• Approximate Fluid Capacities
• Oil Pressure Diagnosis and Testing
• Camshaft Timing Chain and Sprocket Cleaning and Inspection
• Timing Chain and Sprocket Removal
• Camshaft Position Actuator Cleaning and Inspection
• Camshaft Position Actuator Magnet Cleaning and Inspection
• Testing for Intermittent Conditions and Poor Connections
• Heated Oxygen Sensor Wiring Repairs
• Heated Oxygen Sensor Resistance Learn Reset Caution
• Heated Oxygen Sensor Replacement - Sensor 1
• Throttle Body Inspection and Cleaning
• Air Cleaner Element Replacement
• Diagnostic Trouble Code (DTC) List - Vehicle
• Restricted Exhaust
• Temperature Versus Resistance
• Altitude Versus Barometric Pressure
• DTC P0641 or P0651
• Cooling System Leak Testing
• Silicon Contamination of Heated Oxygen Sensors Caution
• Alcohol/Contaminants-in-Fuel Diagnosis
• Oil Consumption Diagnosis
• Loss of Coolant
• Symptoms - Engine Exhaust
• Crankcase Ventilation System Inspection/Diagnosis
• Relay Replacement (Attached to Wire Harness)
• Crankshaft Position System Variation Learn
• Spark Plug Wire Inspection
• Ignition System Specifications
• Spark Plug Inspection
• Crankshaft and Bearing Cleaning and Inspection
• DTC P0106