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Engine Control System & Fuel System - 3.7l - DTC p0013 to DTC p0365 Chevrolet Colorado I

Testing & Diagnostics ~23185 words

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Exhaust CMP Actuator Solenoid ControlP0013P0013P0013P0014
Exhaust CMP Actuator Low ReferenceP0013

DTC P0013

Circuit/System Description

The camshaft position (CMP) actuator is attached to each 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 control module. The control module sends a pulse width modulated 12-volt signal to a CMP actuator solenoid. The solenoid controls the amount of engine oil flow to a CMP actuator. The CMP actuator can change the camshaft angle a maximum of 25 degrees. The control module increases the pulse width to accomplish the desired camshaft operation.

Conditions for Running the DTC

  1. The engine is running.
  2. The system voltage is between 11-18 volts.

Conditions for Setting the DTC

The ECM detects an open, short to ground, or a short to voltage on the control circuit or an open on the low reference circuit for more than 0.25 second.

Action Taken When the DTC Sets

DTC P0013 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P0013 is a Type B DTC.

Reference Information

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Ensure the vehicle has the proper oil viscosity.
  2. Observe the engine oil level. The engine oil level should be within the operating range.
  3. Allow the engine to reach operating temperature.
  4. Command each CMP actuator to 20 percent. The CMP actuator angle desired parameter should match the CMP actuator actual 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. With the ignition ON, measure for battery voltage between the CMP actuator solenoid control of the affected actuator and a ground. If less than battery voltage, test the CMP actuator control circuit for an open, short to ground. If the circuit tests normal, replace the control module.
  2. Connect a test lamp between the CMP actuator solenoid control of the affected actuator and a good ground. The test lamp should not illuminate. If the test lamp illuminates, test the CMP actuator control circuit for a short to voltage. If the circuit tests normal, replace the control module.
  3. Command each CMP actuator solenoid between 0-50 percent. The test lamp should turn ON and OFF. If the test lamp does not turn ON and OFF, test the CMP actuator control circuit for high resistance. If the circuit tests normal, replace the control module.
  4. Connect a test lamp between the low reference circuit of the CMP actuator solenoid of the affected actuator and battery voltage. The test lamp should illuminate. If the test lamp does not illuminate, test the low reference circuit for an open, high resistance. If the circuit tests normal, replace the control module.
  5. 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.
  6. Test the engine oil pressure. Refer to «Oil Pressure Diagnosis and Testing»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l__oil-pressure-diagnosis-and-testing) . If the oil pressure is low, correct the low pressure first.
  7. 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
  8. Inspect for the following conditions: Excessive timing chain play Proper installation of the CMP actuator assembly

Component Testing

  1. Measure the resistance of each CMP actuator solenoid valve assembly. Resistance should be between 8-12 ohms.
  2. Connect a jumper wire between the CMP actuator low reference circuit at the solenoid and a good ground. Connect a fused jumper wire to the CMP actuator high control circuit at the solenoid. Momentarily touch the fused jumper to B+. Observe the spool valve inside the CMP actuator. The spool valve should move from fully closed to fully opened position.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Camshaft Position Actuator Solenoid Valve Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for replacement, setup, and programming.
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Exhaust CMP Actuator Solenoid ControlP0013P0013P0013P0014
Exhaust CMP Actuator Low ReferenceP0013

DTC P0014

The camshaft position (CMP) actuator is attached to each 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 control module. The control module sends a pulse width modulated 12-volt signal to a CMP actuator solenoid. The solenoid controls the amount of engine oil flow to a CMP actuator. The CMP actuator can change the camshaft angle a maximum of 25 degrees. The control module increases the pulse width to accomplish the desired camshaft operation.

  1. The engine is running.
  2. DTC P0017, P0335, P0336, P0365, P0366 are not set.
  3. The system voltage is between 11-18 volts.
  4. The ECM has enabled the CMP actuator and commanded greater than 0 degrees.
  5. DTC P0014 runs continuously when the above conditions are met.

The difference between the desired CMP and the actual CMP angle is more than 3.75 degrees for 14.5 seconds during a 15 second sample.

DTC P0014 is a Type B DTC.

DTC P0014 is a Type B DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ensure the vehicle has the proper oil viscosity.
  2. Observe the engine oil level. The engine oil level should be within the operating range.
  3. Allow the engine to reach operating temperature.
  4. Command each CMP actuator to 20 percent. The CMP actuator angle desired parameter should match the CMP actuator actual 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.
  1. With the ignition ON, measure for battery voltage between the CMP actuator solenoid control of the affected actuator and a ground. If less than battery voltage, test the CMP actuator control circuit for an open, short to ground. If the circuit tests normal, replace the control module.
  2. Connect a test lamp between the CMP actuator solenoid control of the affected actuator and a good ground. The test lamp should not illuminate. If the test lamp illuminates, test the CMP actuator control circuit for a short to voltage. If the circuit tests normal, replace the control module.
  3. Command each CMP actuator solenoid between 0-50 percent. The test lamp should turn ON and OFF. If the test lamp does not turn ON and OFF, test the CMP actuator control circuit for high resistance. If the circuit tests normal, replace the control module.
  4. Connect a test lamp between the low reference circuit of the CMP actuator solenoid of the affected actuator and battery voltage. The test lamp should illuminate. If the test lamp does not illuminate, test the low reference circuit for an open, high resistance. If the circuit tests normal, replace the control module.
  5. 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.
  6. Test the engine oil pressure. Refer to «Oil Pressure Diagnosis and Testing»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l__oil-pressure-diagnosis-and-testing) . If the oil pressure is low, correct the low pressure first.
  7. 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
  8. Inspect for the following conditions: Excessive timing chain play Proper installation of the CMP actuator assembly
  1. Measure the resistance of each CMP actuator solenoid valve assembly. Resistance should be between 8-12 ohms.
  2. Connect a jumper wire between the CMP actuator low reference circuit at the solenoid and a good ground. Connect a fused jumper wire to the CMP actuator high control circuit at the solenoid. Momentarily touch the fused jumper to B+. Observe the spool valve inside the CMP actuator. The spool valve should move from fully closed to fully opened position.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Camshaft Position Actuator Solenoid Valve Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for replacement, setup, and programming.
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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

  1. DTCs P0335, P0336, P0365, P0366, P0641, and P0651 are not set.
  2. The engine is cranking or running.
  3. The engine speed is less than 1,200 RPM and the CMP actuator is commanded to the home or parked position.
  4. These DTCs run continuously when the above conditions are met.

The ECM detects that the CMP sensor pulse is more than 16.31 degrees out of sequence with the corresponding crank sensor pulse.

DTCs P0016 and P0017 are Type B DTCs.

DTCs P0016 and P0017 are Type B DTCs.

Diagnostic Aids

IMPORTANTThe scan tool control of the CMP actuator solenoid is inhibited when DTC P0016 or P0017 sets.
  1. Inspect the engine for any recent engine mechanical repairs. An incorrectly installed camshaft, crankshaft, or timing chain can cause this DTC to set.
  2. Excessive crankshaft endplay can cause this DTC to set.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Operate the vehicle at idle and at various engine speeds and load ranges while observing the CMP Variance, Desired CMP, and CMP Angle parameters with a scan tool.
  2. The CMP Variance should remain less than or equal to 1 degree unless the CMP actuator is being commanded. If the CMP actuator is commanded, 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 less than or equal to 1 degree. If the CMP Variance remains more than 1 degree for more than 3 seconds, continue with the Circuit/System Testing.
  1. Ignition OFF, inspect the crankshaft balancer bolt for the proper torque. Refer to «Fastener Tightening Specifications»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l__fastener-tightening-specifications) . If the crankshaft balancer bolt is not at the proper torque, refer to «Crankshaft Balancer Replacement»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l__crankshaft-balancer-replacement) .
  2. Remove the CMP actuator solenoid. Refer to «Camshaft Position Actuator Solenoid Valve Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2) .
  3. Connect a jumper wire between the CMP actuator low reference circuit at the solenoid and a good ground. Connect a fused jumper wire to the CMP actuator high control circuit at the solenoid. Momentarily touch the fused jumper to B+. Observe the spool valve inside the CMP actuator. The spool valve should move from fully closed to fully opened position. If the spool valve inside the CMP actuator solenoid does not move, replace the CMP actuator solenoid.
  4. Inspect the CMP actuator for binding or being stuck. Refer to «Camshaft Position Actuator Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l__camshaft-position-actuator-diagnosis) .
  5. Inspect the engine for correct valve timing. Refer to «Timing Chain and Sprocket Replacement»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l__timing-chain-and-sprocket-replacement) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Camshaft Position Exhaust Actuator Replacement»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l__camshaft-position-exhaust-actuator-replacement)
  2. «Camshaft Position Actuator Solenoid Valve Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
HO2S Heater Voltage SupplyOpens fuseP0030, P0036, P0053, P0054, P0135, P0141P0030, P0036, P0135, P0141P0135, P0141
HO2S Heater Low ControlP0030, P0036P0030, P0036, P0053, P0054, P0135, P0141P0030, P0036, P0135, P0141P0030, P0036, P0135, P0141P0135, P0141

DTC P0030, P0036, P0053, P0054, P0135, or P0141

Typical Scan Tool Data

CircuitNormal RangeShort to GroundOpenShort to Voltage
HO2S Heater Low Control0.5-2 A0 A0 A0 A
HO2S Heater Voltage Supply0.5-2 A0 A0 A0.5-2 A

HO2S Heater

Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the 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 or P0036

  1. The Ignition 1 Signal parameter is between 10-18 volts.
  2. The engine speed is more than 400 RPM.
  3. DTC P0030 and P0036 runs continuously when the above conditions are met for 1 second.

P0053 or P0054

  1. DTCs P0112, P0113, P0117, P0118 are not set.
  2. The engine is started.
  3. The ignition is OFF for more than 10 hours.
  4. The Engine Coolant Temperature (ECT) Sensor parameter is between 0-40°C (32-104°F) at engine start-up.
  5. The ECT Sensor parameter minus the Intake Air Temperature (IAT) Sensor parameter is less than 8°C (14°F) at engine start-up.
  6. DTCs P0053 and P0054 run once per drive cycle when the above conditions are met.

P0135

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The ECT Sensor parameter is more than 70°C (158°F).
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The MAF Sensor parameter is between 5-25 g/s.
  5. The Engine Run Time parameter is more than 60 seconds.
  6. The Engine Speed parameter is between 500-3,000 RPM.
  7. DTC P0135 runs the heater current test twice per drive cycle when the above conditions are met for 2 seconds.

P0141

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The ECT Sensor parameter is more than 70°C (158°F).
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The MAF Sensor parameter is between 5-25 g/s.
  5. The Engine Run Time parameter is more than 60 seconds.
  6. The Engine Speed parameter is between 500-3,000 RPM.
  7. DTC P0141 runs the heater current test twice per drive cycle, once the above conditions are met for 2 seconds.

P0030 or P0036

  1. The ECM detects that the affected HO2S heater low control circuit is not within a specified range.
  2. DTCs P0030 and P0036 set within 3 seconds when the above condition is met.

P0053 or P0054

  1. The ECM detects that the affected HO2S heater low control circuit is not within a specified range at engine start-up.
  2. DTCs P0053 and P0054 set within 1 second when the above condition is met.

P0135

  1. The ECM detects that the HO2S 1 heater current parameter is more than 2.5 amps or less than 0.25 amp.
  2. DTC P0135 sets within 30 seconds during the heater current test when the above condition is met.

P0141

  1. The ECM detects that the HO2S 2 heater current parameter is more than 2.5 amps or less than 0.25 amp.
  2. DTC P0141 sets within 30 seconds during the heater current test when the above condition is met.

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

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

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Allow the engine to reach operating temperature.
  2. Engine running, observe the HO2S Heater parameter with a scan tool. The value should vary between 0.5-2A.
  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. Disconnect the sensor.
  2. Ignition ON, connect a test lamp between the HO2S heater voltage supply circuit terminal D and ground. The lamp should illuminate. If the lamp does not illuminate, test the voltage supply circuit for an open/high resistance or a short to ground. If the circuit tests normal and its fuse is open, replace the HO2S.
  3. Ignition OFF, connect a test lamp between the HO2S low control circuit terminal C and battery voltage. The lamp should not illuminate. If the lamp illuminates, test the 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 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 from the heater voltage supply circuit terminal D to the heater control circuit terminal C.
  6. Engine running, observe with a scan tool that the Heater parameter indicates 0.0A. If more than the specified value, test the heater voltage supply and control circuits for resistance greater than 3 ohms. If the circuits test normal, replace the ECM.
  7. If the ECM and all circuits test normal, replace the HO2S.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Heated Oxygen Sensor 1 Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Heated Oxygen Sensor 2 Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  3. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides 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)
  1. DTCs P0641, P0651, P1516, P2101, P2119, P2176 are not set.
  2. The engine is running and the engine speed is more than 800 RPM.
  3. DTC P0068 and P0121 run continuously when the above conditions are met.

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

  1. DTC P0068 is a Type A DTC.
  2. DTC P0121 is a Type B DTC.
  3. The control module commands the TAC system to operate in the Reduced Engine Power mode.
  4. A message center or an indicator displays Reduced Engine Power.
  5. Under certain conditions the control module commands the engine OFF.
  1. DTC P0068 is a Type A DTC.
  2. DTC P0121 is a Type B DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Inspect for the following conditions: Vacuum hoses for splits, kinks, and proper connections Inspect thoroughly for any type of leak or restriction Air leaks at throttle body mounting area and intake manifold sealing surfaces
  2. Allow the engine to reach operating temperature. Observe the Manifold Absolute Pressure (MAP) Sensor Voltage parameter with a scan tool. Voltage should be more than 0.8 volt and less than 4 volts. If more than 4 volts or less than 0.8 volt, refer to «DTC P0106»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) .
  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 as engine speed is increased and returned to idle. If the MAP sensor kPa does not change refer to «DTC P0106»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) .
  4. Take a snapshot of the engine data list while performing the actions listed below. The 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 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) .
  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. «Throttle Body Assembly Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Ignition 1 VoltageP0030, P0036, P0102, P0443P0101P0102P0101, P0103
MAF Sensor SignalP0102P0102P0102P0102P0101, P0103, P1101
GroundP0102P0102P0102

DTC P0101 or P1101

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: 2,000-9,500 Hz
Ignition 1 Voltage0 Hz0 Hz
MAF Sensor Signal0 Hz0 Hz0 Hz
Ground0 Hz

MAF Sensor

Circuit Description

The intake flow rationality diagnostic provides the within-range rationality check for the mass air flow (MAF), manifold absolute pressure (MAP), and the throttle position (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.

MAF Performance TestMAP Performance Test 1MAP Performance Test 2TP Performance TestDTCs PassedDTCs Failed
OKOKP0101, P0106, P0121, P1101None
OKOKFaultOKP0101, P0106, P0121, P1101None
FaultOKFaultOKP0106, P0121, P1101P0101
OKFaultFaultOKP0101, P0121, P1101P0106
FaultFaultFaultOKP0121, P1101P0101, P0106
OKFaultP0101, P0106, P1101P0121
OKOKFaultFaultP0101, P0106, P0121, P1101None
FaultOKFaultFaultP0101, P0106, P0121P1101
FaultFaultFaultP0101, P0106, P0121P1101

Scan Tool Diagnostic Test Results

Conditions for Running the DTCs

  1. DTC P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, or P0336 is not set.
  2. The engine speed is between 400-8,192 RPM.
  3. The IAT Sensor parameter is between -7 to +125°C (+19 to +257°F).
  4. The ECT Sensor parameter is between 70-125°C (158-257°F).
  5. This DTC runs continuously within the enabling conditions.

Conditions for Setting the DTCs

The 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 more than 2 seconds.

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.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 38522 Variable Signal Generator

  1. Verify that DTC P0641 or P0651 is not set. If any of the DTCs are set refer to «DTC P0641 or P0651»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0366-to-dtc-p2440) .
  2. Verify that restrictions do not exist in the exhaust system. Refer to «Restricted Exhaust»(/chevrolet/colorado/i-2004-2012/remont/exhaust/#engine-exhaust-system) .
  3. Engine operating at idle, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,200 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 190 g/s at the time of the 1-2 shift.
  5. Use the scan tool and compare the MAF 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2__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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) .
  8. 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. 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 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 MAF/IAT sensor.
  3. Ignition OFF for 90 seconds, 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 volts 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 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. Ignition OFF, connect the red lead of the J 38522 to the signal circuit terminal A at the MAF/IAT sensor harness connector. Connect the battery voltage supply to B+, and ground the black lead.
  7. Set the J 38522 Signal switch to 5 volts, 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 ECM.
  9. If the circuits test normal, test or replace the MAF sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Mass Airflow Sensor/Intake Air Temperature Sensor Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Ignition 1 VoltageP0030, P0036, P0102, P0443P0101P0102P0101, P0103
MAF Sensor SignalP0102P0102P0102P0102P0101, P0103, P1101
GroundP0102P0102P0102

DTC P0102 or P0103

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: 2,000-9,500 Hz
Ignition 1 Voltage0 Hz0 Hz
MAF Sensor Signal0 Hz0 Hz0 Hz
Ground0 Hz

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

The ECM applies 5 volts 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 9,500 Hertz at maximum engine load.

  1. The engine is running for greater than one second.
  2. The engine speed is greater than 300 RPM.
  3. The ignition 1 signal is greater than 8 volts.
  4. The above conditions are met for greater than 1 second.
  5. This DTC runs continuously within the enabling conditions.

P0102

The ECM detects that the MAF Sensor parameter is less than 10 Hz for greater than 5 seconds.

P0103

The ECM detects that the MAF Sensor parameter is greater than 11,000 Hz for greater than 5 seconds.

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 increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

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 1,700-3,200 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 190 g/s at the time of the 1-2 shift.
  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. 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 MAF/IAT sensor.
  3. Ignition OFF for 90 seconds, 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 volts 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 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. Ignition OFF, connect the red lead of the J 38522 to the signal circuit terminal A at the MAF/IAT sensor harness connector. Connect the battery voltage supply to B+, and ground the black lead.
  7. Set the J 38522 Signal switch to 5 volts, 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 ECM.
  9. If the circuits test normal, test or replace the MAF sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Mass Airflow Sensor/Intake Air Temperature Sensor Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
5-Volt ReferenceP0107, P0340, P0365, P0452, P0532, P0641P0106, P0107P0107P0108, P0340, P0365, P0453, P0533, P0641P0106, P0107
MAP Sensor SignalP0107P0106, P0107P0107P0108P0106, P0107, P1101
Low ReferenceP0106, P0108P0106, P0108P0106, P0108

DTC P0106

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running, transmission in Park or Neutral Parameter Normal Range: 20-42 kPa
5-Volt Reference0 kPa0 kPaVaries
MAP Sensor Signal0 kPa0 kPa127 kPa
Low Reference126 kPa

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.

MAF Performance TestMAP Performance Test 1MAP Performance Test 2TP Performance TestDTCs PassedDTCs Failed
OKOKP0101, P0106, P0121, P1101None
OKOKFaultOKP0101, P0106, P0121, P1101None
FaultOKFaultOKP0106, P0121, P1101P0101
OKFaultFaultOKP0101, P0121, P1101P0106
FaultFaultFaultOKP0121, P1101P0101, P0106
OKFaultP0101, P0106, P1101P0121
OKOKFaultFaultP0101, P0106, P0121, P1101None
FaultOKFaultFaultP0101, P0106, P0121P1101
FaultFaultFaultP0101, P0106, P0121P1101

Scan Tool Diagnostic Test Results

  1. DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, or P0336 is not set.
  2. The engine speed is between 400-8,192 RPM.
  3. The IAT Sensor parameter is between -7°C to +125°C (+19°F to +257°F).
  4. The ECT Sensor parameter is between 70-125°C (158-257°F).
  5. This DTC runs continuously within the enabling conditions.

The 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 more than 2 seconds.

DTC P0106 is a Type B 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 Sensor 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2__temperature-versus-resistance) .
  3. The barometric pressure (BARO) that is used by the ECM to calculate the air flow models is initially based on the MAP sensor at ignition ON. When the engine is running, the ECM will continually update the BARO value near WOT using the MAP sensor and a calculation. A skewed MAP sensor will cause the BARO value to be inaccurate.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

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 DTC P0641 or P0651 is not set. If any of the DTCs are set, refer to «DTC P0641 or P0651»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0366-to-dtc-p2440) .
  2. Verify that restrictions do not exist in the exhaust system. Refer to «Restricted Exhaust»(/chevrolet/colorado/i-2004-2012/remont/exhaust/#engine-exhaust-system) .
  3. Ignition OFF for 90 seconds, determine the current vehicle testing altitude.
  4. Ignition ON, engine OFF, observe the scan tool BARO parameter. Compare the parameter to the «Altitude Versus Barometric Pressure»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2__altitude-versus-barometric-pressure) table. The BARO parameter should be within the specified range indicated in the table.
  5. Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions. The readings should be within 5 kPa of the known good vehicle.
  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. 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 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 Sensor parameter is less than 1 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 Sensor parameter is greater than 126 kPa. 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.
  7. If the circuits test normal, test or replace the MAP sensor.

Skewed Signal Test

  1. Ignition OFF, remove the vacuum source from the MAP sensor.
  2. Ignition ON, observe and recorded the scan tool MAP Sensor 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 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 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 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, install the J 23738-A or J 35555 to the MAP sensor vacuum port. 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
5-Volt ReferenceP0107, P0452, P0532, P0641P0106, P0107P0107P0106, P0108, P0453, P0533, P0641P0106, P0107
MAP Sensor SignalP0107P0106, P0107P0107P0108P0106, P0107, P1101
Low ReferenceP0106, P0108P0106, P0108P0106, P0108

DTC P0107 or P0108

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running, transmission in Park or Neutral Parameter Normal Range: 20-42 kPa
5-Volt Reference0 kPa0 kPaVaries
MAP Sensor Signal0 kPa0 kPa127 kPa
Low Reference126 kPa

MAP Sensor

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

P0107

  1. DTC P0641 or P0651 is not set.
  2. The ignition is ON, or the engine is running.
  3. This DTC runs continuously within the enabling conditions.

P0108

  1. DTC P0641 or P0651 is not set.
  2. The ignition is ON, or the engine is running.
  3. This DTC runs continuously within the enabling conditions.

P0107

The ECM detects that the MAP sensor voltage is less than 0.20 volt for more than 5 seconds.

P0108

The ECM detects that the MAP sensor voltage is greater than 4.80 volts for more than 5 seconds.

DTCs P0107 and P0108 are Type B DTCs.

DTCs P0107 and P0108 are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

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 DTC P0641 or P0651 is not set. If any of the DTCs are set, refer to «DTC P0641 or P0651»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0366-to-dtc-p2440) .
  2. Ignition ON, observe the scan tool MAP sensor parameter. The reading should be between 0.20-4.80 volts. 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 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 4.8-5.2 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.
  4. Verify the scan tool MAP Sensor parameter is less than 1 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 5-volt 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 a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. If the circuits test normal, test or replace the MAP sensor.
IMPORTANTYou must perform the circuit/system testing, in order to verify the integrity of the MAP sensor circuits, before proceeding with the component testing.

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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to Voltage
IAT Sensor SignalP0112P0113P0113P0113
Low ReferenceP0113P0113P0113

DTC P0112 or P0113

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: -39 to +120°C (-38 to +248°F) depending on the ambient temperature
IAT Sensor Signal150°C (302°F)40°C (-40°F)40°C (-40°F)
Low Reference40°C (-40°F)40°C (-40°F)

IAT Sensor

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

P0112

  1. DTC P0116, P0117, P0118, P0128, P0502, or P0503 is not set.
  2. The engine is running for greater than 10 seconds.
  3. The engine coolant temperature (ECT) is colder than 150°C (302°F).
  4. This DTC runs continuously within the enabling conditions.

P0113

  1. DTC P0101, P0102, P0103, P0116, P0117, P0118, P0128, P0502, or P0503 is not set.
  2. The engine is running for greater than 10 seconds.
  3. The ECT is warmer than -40°C (-40°F).
  4. This DTC runs continuously within the enabling conditions.

P0112

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

P0113

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

DTCs P0112 and P0113 are Type B DTCs.

DTCs P0112 and P0113 are Type B DTCs.

  1. If the engine is cold, then at ignition ON, 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.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

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 Sensor and ECT Sensor parameters. The IAT, ECT, 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.
  4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. Ignition OFF for 90 seconds, 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 ECM.
  3. Ignition ON, verify the scan tool IAT Sensor 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 ECM.
  4. Install a 3A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool IAT 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 the circuits test normal, test or replace the IAT sensor.

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 .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Mass Airflow Sensor/Intake Air Temperature Sensor Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
ECT Sensor SignalP0117P0118P0118P0118P0116, P0128
Low ReferenceP0118P0118P0118P0128

DTC P0116

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: Varies with coolant temperature
ECT Sensor Signal150°C (302°F)40°C (-40°F)40°C (-40°F)
Low Reference40°C (-40°F)40°C (-40°F)

ECT Sensor

The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 volts to the ECT sensor signal circuit and a ground for 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 time is met at start-up, the ECM will compare the temperature difference between the ECT and the intake air temperature (IAT) to determine if the temperatures are within an acceptable operating range of each other.

  1. DTC P0112, P0113, P0117, P0118, P0128, P0502, P0503, P0601, P1621, or P2610 is not set.
  2. The vehicle has had a minimum ignition OFF time of 8 hours.
  3. The ignition is ON.
  4. The IAT Sensor parameter is warmer than -7°C (+19°F).
  5. The Fuel Level Sensor parameter is greater than 10 percent
  6. This DTC runs once per ignition cycle within the enabling conditions.
  1. The ECM detects a temperature difference at power-up that indicates that the ECT sensor is 30°C (54°F) warmer than the IAT sensor. OR
  2. The ECM detects a temperature difference at power-up that indicates that the ECT sensor is 16°C (29°F) warmer than the IAT sensor, and the time spent cranking the engine is greater than 10 seconds when the fuel level is greater than 10 percent. OR
  3. The ECM detects a temperature difference at power-up that indicates that the ECT sensor is 16°C (29°F) warmer than the IAT sensor. Then the vehicle must be driven for greater than 6 minutes and 40 seconds at greater than 24 km/h (15 mph). If the IAT sensor then decreases greater than 5°C (9°F), an engine block heater was detected and the test is aborted. If the IAT sensor 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. 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 Versus Resistance»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2__temperature-versus-resistance) table.
  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

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

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/colorado/i-2004-2012/remont/cooling-system-mechanical/#engine-cooling-system) and «Cooling System Draining and Filling (Static Fill)»(/chevrolet/colorado/i-2004-2012/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) or «Cooling System Draining and Filling (Vac N Fill)»(/chevrolet/colorado/i-2004-2012/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-vac) .
  2. Ignition OFF for 8 hours or greater.
  3. Ignition ON, observe the scan tool ECT Sensor and IAT 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 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 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 the 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
ECT Sensor SignalP0117P0118P0118P0118P0116, P0128
Low ReferenceP0118P0118P0118P0128

DTC P0117 or P0118

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: Varies with coolant temperature
ECT Sensor Signal150°C (302°F)40°C (-40°F)40°C (-40°F)
Low Reference40°C (-40°F)40°C (-40°F)

ECT Sensor

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

P0117

  1. The ignition is ON. OR
  2. The engine is running for greater than 10 seconds. OR
  3. The engine run time is less than 10 seconds when the intake air temperature (IAT) is colder than 50°C (122°F).
  4. This DTC runs continuously within the enabling conditions.

P0118

  1. The ignition is ON. OR
  2. The engine is running for greater than 10 seconds. OR
  3. The engine run time is less than 10 seconds when the IAT is warmer than 0°C (32°F).
  4. This DTC runs continuously within the enabling conditions.

P0117

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

P0118

The ECM detects that the ECT 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

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the ECT Sensor parameter. The reading should be between -39 to +120°C (-38 to +248°F).
  2. 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 ECT sensor.
  2. Ignition OFF for 90 seconds, test for less than 5 ohms 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 the 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
TP Sensor 1 SignalP0122P0122, P2135P0123P0068, P0121
TP Sensor 1 5-Volt ReferenceP0122P0122, P2135P0123
TP Sensor 1 Low ReferenceP0123, P2135
TP Sensor 2 SignalP0222P0223, P2135P0223P0068, P0121
TP Sensor 2 5-Volt ReferenceP0222P0222, P2135P0223
TP Sensor 2 Low ReferenceP0223, P2135

DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135

CircuitShort to GroundOpenShort to Voltage
Parameter Normal Range: 0.32-4.75 V
TP Sensor 1 Signal0 V0 V5 V
TP Sensor 1 5-Volt Reference0 V0 V5 V
TP Sensor 1 Low Reference5 V

TP Sensor 1

CircuitShort to GroundOpenShort to Voltage
Parameter Normal Range: 0.25-4.59 V
TP Sensor 2 Signal0 V5 V5 V
TP Sensor 2 5-Volt Reference0 V0 V5 V
TP Sensor 2 Low Reference5 V

TP Sensor 2

The throttle actuator control (TAC) system uses 2 throttle position (TP) sensors to monitor the throttle position. The TP sensors 1 and 2 are located within the throttle body assembly. Each sensor has the following circuits

  1. A 5-volt reference circuit
  2. A low reference circuit
  3. A signal circuit

Two processors are also used to monitor the TAC system data. Both processors are located within the engine control module (ECM). Each signal circuit provides both processors with a signal voltage proportional to throttle plate movement. Both processors monitor each other's data to verify that the indicated TP calculation is correct.

P0120, P0122, P0123, P0220, P0222, P0223

  1. The system voltage is more than 5.23 volts.
  2. The ignition is in the Unlock/Accessory or Run position.
  3. DTC P0641 is not set.
  4. DTCs P0120, P0122, P0123, P0220, P0222, P0223 run continuously when the above conditions are met.

P2135

  1. The system voltage is more than 5.23 volts.
  2. The ignition is in the Unlock/Accessory or Run position.
  3. DTCs P0120, P0220, P0641, P0651 are not set.
  4. DTC P2135 runs continuously when the above conditions are met.

P0120

TP sensor 1 voltage is less than 0.32 volt or more than 4.75 volts for more than 0.5 second.

P0122

The ECM detects that the TP sensor 1 voltage is less than 0.32 volt for more than 0.4 second.

P0123

The ECM detects that the TP sensor 1 voltage is more than 4.75 volts for more than 0.4 second.

P0220

The TP sensor 2 voltage is less than 0.25 volt or more than 4.59 volts for more than 0.5 second.

P0222

The ECM detects that the TP sensor 2 voltage is less than 0.25 volt for more than 0.4 second.

P0223

The ECM detects that the TP sensor 2 voltage is more than 4.59 volts for more than 0.4 second.

P2135

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

  1. DTC P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.
  2. The control module 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 control module commands the engine OFF.

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

Schematic Reference

Description and Operation

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the TP sensor 1 voltage parameter. The reading should be between 0.27-4.67 volts and change with accelerator pedal input.
  2. Ignition ON, observe the TP sensor 2 voltage parameter. The reading should be between 0.31-4.7 volts and change with accelerator pedal input.
  3. Observe the TP sensor 1 and 2 parameter. The scan tool should indicate 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. Verify that DTC P0120 or P0220 are not the only throttle position DTCs set. If DTC P0120 or P0220 are the only DTCs set, replace the control module.
  6. Verify that DTCs P0641 or P0651 are not set. If DTC P0641 or P0651 is set, refer to «DTC P0641 or P0651»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0366-to-dtc-p2440) .
  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 harness connector at the throttle body. Allow sufficient time for the ECM to completely power down.
  2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal C and ground. If greater than 5 ohms, 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 volts between the 5-volt reference circuit terminal E and ground. If less than 4.8 volts, 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 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Verify the scan tool TP sensor 1 voltage is less than 0.1 volt. If greater than 0.1 volt, test the signal circuit terminal D for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Verify the scan tool TP sensor 2 voltage is greater than 4.8 volts. If less than 4.8 volts, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the ECM.
  6. Install a 3A fused jumper wire between the signal circuit terminal D and the 5-volt reference circuit terminal E of the TP sensor 1. Verify the TP sensor 1 voltage is greater than 4.8 volts. If less than 4.8 volts, test the TP sensor 1 signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  7. Install a test lamp between the signal circuit terminal F of the TP sensor 2 and ground. The test lamp should not illuminate. If the test lamp illuminates, test the TP sensor 2 signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  8. Install a 3A fused jumper wire between the signal circuit terminal F and the low reference circuit terminal C of the TP sensor 2. Verify that the TP sensor 2 voltage is less than 0.1 volt. If greater than 0.1 volt, test the TP sensor 2 signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  9. Ignition OFF, disconnect the harness connector at the ECM.
  10. Test for less than 5 ohms of resistance on all TP sensor circuits between the following terminals: The 5-volt reference circuit terminal E to the corresponding ECM terminal The signal circuit terminal F to the corresponding ECM terminal The signal circuit terminal D to the corresponding ECM terminal If greater than 5 ohms, repair the affected circuit.
  11. Test for infinite resistance between TP sensor 1 signal circuit terminal D and TP sensor 2 signal circuit terminal F. If less than infinite resistance, repair the short between TP sensor 1 signal circuit and TP sensor 2 signal circuit.
  12. If all circuits test normal, replace the throttle body.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Throttle Body Assembly Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
ECT Sensor SignalP0117P0118P0118P0118P0116, P0128
Low ReferenceP0118P0118P0118P0128

DTC P0128

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: Varies with coolant temperature
ECT Sensor Signal150°C (302°F)40°C (-40°F)40°C (-40°F)
Low Reference40°C (-40°F)40°C (-40°F)

ECT Sensor

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

The purpose of this diagnostic is to analyze the performance of the thermostat, by 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. DTC P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0502, or P0503 is not set.
  2. The start-up ECT is colder than 65°C (122°F) when the start-up IAT is colder than 10°C (50°F). OR The start-up ECT is colder than 75°C (167°F) when the start-up IAT is warmer than 10°C (50°F).
  3. The start-up IAT is between -7 to +55°C (+19 to +131°F).
  4. The engine run time is between 30 seconds and 30 minutes.
  5. The vehicle has traveled greater than 0.8 kilometers (0.5 miles) at greater than 8 km/h (5 mph).
  6. The mass air flow (MAF) average is greater than 1 g/s.
  7. This DTC runs once per ignition cycle within the enabling conditions.

The ECM detects that the maximum amount of cumulative airflow has been attained, and the minimum ECT of 70°C (158°F) has not been reached with a start-up IAT colder than 10°C (50°F).

OR

The ECM detects that the maximum amount of cumulative airflow has been attained, and the minimum ECT of 80°C (176°F) has not been reached with a start-up IAT warmer than 10°C (50°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. Corrosion in the ECT sensor terminals or the ECT harness connector results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.
  3. A slight to moderate resistance in the ECT sensor signal circuit or low reference circuit will affect this diagnostic. This condition results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

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/colorado/i-2004-2012/remont/cooling-system-mechanical/#engine-cooling-system) and «Cooling System Draining and Filling (Static Fill)»(/chevrolet/colorado/i-2004-2012/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) or «Cooling System Draining and Filling (Vac N Fill)»(/chevrolet/colorado/i-2004-2012/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-vac) .
  2. Ignition OFF for 8 hours or greater.
  3. Ignition ON, observe the scan tool ECT Sensor and IAT Sensor parameters. The ECT, IAT and ambient temperatures should be within 15°C (27°F) of each other.
  4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  5. Verify the proper heat range, and the operation of the thermostat. Refer to «Thermostat Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/cooling-system-mechanical/#engine-cooling-system) .
  1. Ignition OFF, disconnect the harness connector at the ECT sensor.
  2. Ignition OFF for 90 seconds, test for less than 5 ohms 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 the 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Engine Coolant Thermostat Replacement (With LLV and LLR)»(/chevrolet/colorado/i-2004-2012/remont/cooling-system-mechanical/#engine-cooling-system)
  3. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
HO2S High SignalP0131, P0132, P0137, P0140, P1133, P2A00P0131, P0132, P0133, P0134, P0137, P013A, P013B, P013E, P013F, P0140, P1133, P2A00P0131, P0132, P0133, P0134, P0137, P013A, P013B, P013E, P013F, P0140, P1133, P2A00P0132, P0134, P0138, P0140, P1133, P2A00P0133, P0134, P013A, P013B, P013E, P013F, P0140, P1133, P2270, P2A00
HO2S Low SignalP2A00P0131, P0132, P0133, P0134, P0138, P013A, P013B, P013E, P013F, P0140, P1133, P2A00P0131, P0132, P0133, P0134, P0138, P013A, P013B, P013E, P013F, P0140, P1133, P2A00P0134, P0138, P0140, P1133, P2A00P2271, P2A00

DTC P0131, P0132, P0137, or P0138

CircuitNormal RangeShort to GroundOpenShort to Voltage
HO2S High Signal200-800 mV0 mVApproximately 470 mVApproximately 1,100 mV
HO2S Low Signal200-800 mV455 mVApproximately 450 mVApproximately 445 mV

HO2S Sensor 1 Voltage

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 ECM 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 Lean Test Enable

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Loop Status parameter is Closed.
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The Fuel Level Sensor parameter is more than 10 percent.
  5. The Throttle Position (TP) Indicated Angle parameter is between 15-50 percent.
  6. DTC P0131 runs the lean test continuously when the above conditions are met for 2 seconds.

P0131 Power Enrichment Test Enable

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Ignition 1 Signal parameter is between 10-18 volts.
  3. The Fuel Level Sensor parameter is more than 10 percent.
  4. The Engine Run Time parameter is more than 30 seconds.
  5. DTC P0131 runs the power enrichment test continuously when the above conditions are met for 2 seconds.

P0132 Rich Test Enable

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Loop Status parameter is Closed.
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The Fuel Level Sensor parameter is more than 10 percent.
  5. The Throttle Position (TP) Sensor parameter is between 0-50 percent.
  6. DTC P0132 runs the rich test continuously when the above conditions are met for 2 seconds.

P0132 Decel Fuel Cut-Off Test Enable

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Loop Status parameter is Closed.
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The Fuel Level Sensor parameter is more than 10 percent.
  5. The Engine Run Time parameter is more than 30 seconds.
  6. DTC P0132 runs the decel fuel cut-off test continuously when the above conditions are met for 2 seconds.

P0137 Lean Test Enable

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Loop Status parameter is Closed.
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The Fuel Level Sensor parameter is more than 10 percent.
  5. The TP Sensor parameter is between 15-50 percent.
  6. DTC P0137 runs the lean test continuously when the above conditions are met for 2 seconds.

P0137 Power Enrichment Test Enable

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Loop Status parameter is Closed.
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The Fuel Level Sensor parameter is more than 10 percent.
  5. The Engine Run Time parameter is more than 30 seconds.
  6. The Power Enrichment parameter is active for more than 2 seconds.
  7. DTC P0137 runs the power enrichment test during each occurrence of power enrichment, when the above conditions are met for 3 seconds.

P0138 Rich Test Enable

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Loop Status parameter is Closed.
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The Fuel Level Sensor parameter is more than 10 percent.
  5. The TP Sensor parameter is between 0-50 percent.
  6. DTC P0138 runs the rich test continuously when the above conditions are met for 2 seconds.

P0138 Decel Fuel Cut-Off Test Enable

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Loop Status parameter is Closed.
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The Fuel Level Sensor parameter is more than 10 percent.
  5. The Engine Run Time parameter is more than 30 seconds.
  6. The decel fuel cut-off (DFCO) is active.
  7. DTC P0138 runs the decel. fuel cut-off test during each occurrence of the decel. fuel cut-off, when the above conditions are met for 2 seconds.

P0131 Lean Test

  1. The ECM detects that the HO2S 1 Voltage parameter is less than 50 mV.
  2. DTC P0131 sets within 100 seconds during the lean test when the above condition is met.

P0131 Power Enrichment Test

  1. The ECM detects that the HO2S 1 Voltage parameter is less than 800 mV.
  2. DTC P0131 sets within 100 seconds during the power enrichment test when the above condition is met.

P0132 Rich Test

  1. The ECM detects that the HO2S 1 parameter is more than 1,000 mV.
  2. DTC P0132 sets within 15 seconds during the rich test when the above condition is met.

P0132 Decel Fuel Cut-Off Test

  1. The ECM detects that the HO2S 1 parameter is more than 900 mV.
  2. DTC P0132 sets within 10 seconds during the decel fuel cut-off test when the above condition is met.

P0137 Lean Test

  1. The ECM detects that the HO2S 2 voltage parameter is less than 50 mV.
  2. DTC P0137 sets within 100 seconds during the lean test when the above condition is met.

P0137 Power Enrichment Test

  1. The ECM detects that the HO2S 2 voltage parameter is less than 550 mV and the HO2S 1 parameter is more than 800 mV.
  2. DTC P0137 sets within 100 seconds during the power enrichment test when the above condition is met.

P0138 Rich Test

  1. The ECM detects that the HO2S 2 voltage parameter is more than 1,000 mV.
  2. DTC P0138 sets within 100 seconds during the rich test when the above condition is met.

P0138 Decel Fuel Cut-Off Test

  1. The ECM detects that the HO2S 2 voltage parameter is more than 900 mV.
  2. DTC P0138 sets within 100 seconds during the decel fuel cut-off test when the above condition is met.

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

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

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)
  5. «Heated Oxygen Sensor Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)

DTC Type Reference

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 sensors value should vary from below 200 mV to above 800 mV and respond to fueling changes. The post-catalyst oxygen sensors 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: NOTE: Refer to «Silicon Contamination of Heated Oxygen Sensors Notice»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#cautions-and-notices__silicon-contamination-of-heated-oxygen-sensors) . A silicon contaminated HO2S Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) . Engine oil consumption-Refer to «Oil Consumption Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-29l__oil-consumption-diagnosis) . Engine coolant consumption-Refer to «Cooling System Leak Testing»(/chevrolet/colorado/i-2004-2012/remont/cooling-system-mechanical/#engine-cooling-system) .
  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.
  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 diagnostic procedure.

  1. «Heated Oxygen Sensor 1 Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Heated Oxygen Sensor 2 Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  3. «Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
HO2S High SignalP0131, P0132, P0137, P0140, P1133, P2A00P0131, P0132, P0133, P0134, P0137, P013A, P013B, P013E, P013F, P0140, P1133, P2A00P0131, P0132, P0133, P0134, P0137, P013A, P013B, P013E, P013F, P0140, P1133, P2A00P0132, P0134, P0138, P0140, P1133, P2A00P0133, P0134, P013A, P013B, P013E, P013F, P0140, P1133, P2270, P2A00
HO2S Low SignalP2A00P0131, P0132, P0133, P0134, P0138, P013A, P013B, P013E, P013F, P0140, P1133, P2A00P0131, P0132, P0133, P0134, P0138, P013A, P013B, P013E, P013F, P0140, P1133, P2A00P0134, P0138, P0140, P1133, P2A00P2271, P2A00

DTC P0133, P0134, P013A, P013B, P013E, P013F, P0140, P1133, P2270, P2271, or P2A00

CircuitNormal RangeShort to GroundOpenShort to Voltage
HO2S High Signal200-800 mV0 mVApproximately 470 mVApproximately 1,100 mV
HO2S Low Signal200-800 mV455 mVApproximately 450 mVApproximately 445 mV

HO2S Sensor 1 Voltage

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 ECM 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 P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Engine Coolant Temperature (ECT) Sensor parameter is more than 70°C (158°F).
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The Fuel Level Sensor parameter is more than 10 percent.
  5. The Engine Run Time parameter is more than 200 seconds.
  6. The Engine Speed parameter is between 1,000-3,500 RPM.
  7. The Manifold Absolute Pressure (MAP) Sensor parameter is more than 30 kPa.
  8. The Mass Airflow (MAF) Sensor parameter is between 11-50 g/s.
  9. The Loop Status parameter is Closed.
  10. The Throttle Position (TP) Indicated Angle parameter is more than 5 percent.
  11. DTC P0133 runs once per drive cycle when the above conditions are met for 2 seconds.

P0134

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Engine Coolant Temperature (ECT) Sensor parameter is more than 70°C (158°F).
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The engine run time is more than 200 seconds.
  5. DTC P0134 runs continuously when the above conditions are met.

P013A

  1. DTCs P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1174, P1516, P2101, P2119, P2135, P2176, P2270, 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
  8. DFCO is active.
  9. APP is stable.
  10. TCC is locked.
  11. DTCs P013E and P2270 has run and passed.
  12. This DTC runs once per trip.

P013B

  1. DTCs P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1174, P1516, P2101, P2119, P2135, P2176, P2270, 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
  8. DTC P013A, P013E, P013F, P2270, and P2271 have run and passed.
  9. This DTC runs once per trip.

P013E

  1. DTCs P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1174, P1516, P2101, P2119, P2135, P2176, P2270, 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
  8. DFCO is active.
  9. APP is stable.
  10. TCC is locked.
  11. DTC P2270 has run and passed.
  12. This DTC runs once per trip.

P013F

  1. DTCs P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1174, P1516, P2101, P2119, P2135, P2176, P2270, 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
  8. DTC P013A, P013E, P2270, and P2271 have run and passed.
  9. This DTC runs once per trip.

P0140

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The ECT Sensor parameter is more than 70°C (158°F).
  3. The Ignition 1 Signal parameter is between 10-18 volts.
  4. The Engine Run Time parameter is more than 200 seconds.
  5. The Loop Status parameter is closed.
  6. DTC P0140 runs once per drive cycle when the above conditions are met.

P1133

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The ECT Sensor parameter is more than 70°C (158°F).
  3. The Engine Speed parameter is between 1,500-3,500 RPM.
  4. The Ignition 1 Signal parameter is between 10-18 volts.
  5. The Engine Run Time parameter is more than 200 seconds.
  6. The Loop Status parameter is Closed.
  7. The TP Indicated Angle parameter is more than 5 percent.
  8. The Fuel Level Sensor parameter is more than 10 percent.
  9. The MAP Sensor parameter is more than 30 kPa.
  10. The MAF Sensor parameter is between 11-50 g/s.
  11. DTC P1133 runs once per drive cycle when the above conditions are met for 2 seconds.

P2270

  1. DTCs P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1174, P1516, P2101, P2119, P2135, P2176, P2270, 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
  8. DTCs are not active.
  9. The engine speed is between 1,100-2,100 RPM.
  10. Airflow is equal to or more than 3 g/s and equal to or less than 12 g/s.
  11. 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).
  12. The short term fuel trim is equal to or more than 0.9 and equal to or less than 1.065.
  13. The fuel state is in closed loop.
  14. The EVAP diagnostics are not in control of purge.
  15. The Ethanol Estimate is not in progress.
  16. The Post Cell Enabled.
  17. The Power Take-Off is not active.
  18. The EGR diagnostic is not intrusive.
  19. The Heater Warm-up Delay is more than 120 seconds.
  20. The catalytic converter temperature is equal to or more than 650°C (1,202°F), and equal to less than 900°C (1,652°F).
  21. This DTC runs once per trip when all of the above conditions have been met for 2 seconds.

P2271

  1. DTCs P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1174, P1516, P2101, P2119, P2135, P2176, P2270, 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
  8. DFCO is active.
  9. APP is stable.
  10. TCC is locked.
  11. DTC P013A, P013E, and P2270 have run and passed.
  12. This DTC runs once per trip.

P2A00

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The Engine Run Time parameter is more than 100 seconds.
  3. The Engine speed parameter is between 1,000-3,400 RPM.
  4. The Ignition 1 Signal parameter is between 10-18 volts.
  5. The Mass Airflow (MAF) Sensor parameter is between 10-30 g/s.
  6. The ECT Sensor parameter is more than 70°C (158°F).
  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 or lean-to-rich average response time is more than 0.1 second.
  2. DTC P0133 sets within 60 seconds when the above condition is met.

P0134

  1. The ECM detects that the HO2S 1 parameter is between 400-500 mV for 100 seconds.
  2. The Throttle Position (TP) Indicated Angle parameter changes more than 1 percent, 3 times.
  3. DTC P0134 sets within 100 seconds when the above conditions are met.

P013A

  1. The ECM detects that the EWMA of the normalized integral value equals 7.0 integral units. OR
  2. The ECM detects that the accumulated mass air flow monitored during rich-to-lean transitions between 450-150 mV is more than 20 grams.

P013B

  1. The ECM detects that the EWMA of the normalized integral value equals 8.5 integral units. OR
  2. The ECM detects that the accumulated mass air flow monitored during lean-to-rich transitions between 550-775 mV is more than 15 grams.

P013E

The ECM detects that the O2 sensor cannot achieve voltage below 450 mV within 8 grams of accumulated air flow.

P013F

The ECM detects that the O2 sensor cannot achieve voltage above 550 mV within 28 grams of accumulated air flow.

P0140

  1. The ECM detects that the HO2S 2 parameter is between 425-475 mV.
  2. The TP Indicated Angle parameter changes more than 1 percent 3 times.
  3. DTC P0140 sets within 100 seconds when the above conditions are met.

P1133

  1. The ECM detects that the HO2S 1 rich-to-lean counts, or the lean-to-rich counts are less than a calibrated value.
  2. DTC P1133 sets within 60 seconds when the above condition is met.

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 Loop Status parameter is open.
  2. DTC P2A00 sets within 50 seconds when the above condition is met.
  1. DTC P0133, P0134, P013E, P013F, P0140, P1133, P2270, P2271, P2A00 are Type B DTCs.
  2. P013A and P013B are Type A DTCs.
  1. DTC P0133, P0134, P013E, P013F, P0140, P1133, P2270, P2271, P2A00 are Type B DTCs.
  2. P013A and P013B are Type A DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)
  5. «Heated Oxygen Sensor Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)

DTC Type Reference

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 sensors value should vary from below 200 mV to above 800 mV and respond to fueling changes. The post-catalyst oxygen sensors 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: NOTE: Refer to «Silicon Contamination of Heated Oxygen Sensors Notice»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#cautions-and-notices__silicon-contamination-of-heated-oxygen-sensors) . A silicon contaminated HO2S Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) . Engine oil consumption-Refer to «Oil Consumption Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-29l__oil-consumption-diagnosis) . Engine coolant consumption-Refer to «Cooling System Leak Testing»(/chevrolet/colorado/i-2004-2012/remont/cooling-system-mechanical/#engine-cooling-system) .
  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.
  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 diagnostic procedure.

  1. «Heated Oxygen Sensor 1 Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Heated Oxygen Sensor 2 Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  3. «Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic procedure.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__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. Fuel delivery is controlled differently during Open Loop and Closed Loop (CL). During Open Loop, the ECM determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S) input. During CL, the ECM adds HO2S inputs and level of purge to calculate the short and long term fuel trim (FT) adjustments. If the HO2S indicates a lean condition, the FT values will be above 0 percent. If the HO2S indicates a rich condition, the FT values will be below 0 percent. The short term FT values change rapidly in response to the HO2S voltage signals. The long term FT makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. A block of cells contain information arranged in combinations of engine RPM and engine load for a full range of vehicle operating conditions. The long term FT diagnostic is based on an average of cells currently being used. The ECM selects the cells based on the engine speed and load. The FT diagnostic will conduct a test to determine if a rich failure actually exists or if excessive vapor from the evaporative emission (EVAP) canister is causing a rich condition.

If the ECM detects an excessively lean condition, DTC P0171 sets. If the ECM detects an excessively rich condition, DTC P0172 sets.

  1. DTCs P0030, P0053, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0131, P0132, P0133, P0134, P0135, P0201-P0205, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P0506, P0507, P060D, P1133, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176, P2430, P2431, P2432, P2433, P2440, P2444, P2A00 are not set.
  2. The engine is in CL status.
  3. The engine coolant temperature (ECT) is between -20 and +150°C (-4 and +302°F).
  4. The intake air temperature (IAT) is between -20 and +150°C (-4 and +302°F).
  5. The manifold absolute pressure (MAP) is between 11-254 kPa.
  6. The vehicle speed is less than 300 km/h (186 mph).
  7. The engine speed is between 400-7,000 RPM.
  8. The mass air flow (MAF) is between 1-511 g/s.
  9. The barometric pressure (BARO) is more than 70 kPa.
  10. The fuel level is more than 10 percent.
  11. 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.

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

IMPORTANTDisregard any transmission symptoms, antilock brake system (ABS) indicators, and traction control system (TCS) indicators until any fuel trim faults are repaired. A fuel trim fault may cause default actions such as harsh shifts and illumination of the ABS/TCS indicators.
  1. Verify that other DTCs are not set. If any DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
  2. Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S value should vary from approximately 40 mV to approximately 900 mV, and respond to fueling changes. If the value does not vary from approximately 40 mV to approximately 900 mV, refer to «DTC P0131, P0132, P0137, or P0138»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) or «DTC P0133, P0134, P013A, P013B, P013E, P013F, P0140, P1133, P2270, P2271, or P2A00»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) .
  3. 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.
  4. 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.

P0171

Allow the engine to reach operating temperature. With the engine running, observe the Long Term FT parameter with a scan tool. The value should be less than approximately 29 percent with the engine running at operating temperature.

  1. If the value is not less than 29 percent, inspect for the following
  1. With the ignition ON and the 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2__altitude-versus-barometric-pressure) . If the MAP sensor does not indicate the correct barometric pressure, refer to «DTC P0106»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) .
  2. 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) or «DTC P0102 or P0103»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) .
  3. Vacuum hoses for splits, kinks, and improper connections
  4. Insufficient fuel in the tank
  5. Low fuel pressure-Refer to «Fuel System Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) .
  6. Ethanol concentration greater than 15 percent-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) .
  7. Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) .
  8. Malfunctioning fuel injectors-Refer to «Fuel Injector Diagnosis (w/CH47976)»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) or «Fuel Injector Diagnosis (w/J39021 or w/Tech 2)»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) .
  9. Missing, loose, or leaking exhaust components from the HO2S forward-Refer to «Symptoms - Engine Exhaust»(/chevrolet/colorado/i-2004-2012/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) .
  10. Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
  11. The air induction system and the air intake ducts for leaks or for a missing air filter element
  12. A cracked EVAP canister
  13. Evaporative pipes obstructed or leaking
  14. The crankcase ventilation system for leaks-Refer to «Crankcase Ventilation System Inspection/Description»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l) .
  15. The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
  16. The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
  17. Malfunctioning engine components-Refer to «Symptoms - Engine Mechanical»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l) .

P0172

Allow the engine to reach operating temperature. With the engine running, observe the Long Term FT parameter with a scan tool. The value should be more than approximately -21 percent with the engine running at operating temperature.

  1. If the value is not more than -21 percent, inspect for the following
  1. With the engine idling and the transmission in the Park or Neutral position, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor parameter should be between 19-42 kPa. If the MAP sensor parameter is not between 19-42 kPa, refer to «DTC P0106»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) .
  2. 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) or «DTC P0102 or P0103»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0013-to-dtc-p0365) .
  3. Vacuum hoses for splits, kinks, and improper connections
  4. The air intake duct for being collapsed or restricted
  5. The air filter for being dirty or restricted
  6. Objects blocking the throttle body
  7. Excessive fuel in the crankcase due to leaking fuel injectors
  8. The evaporative emissions control system for improper operation
  9. Excessive fuel pressure-Refer to «Fuel System Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) .
  10. Malfunctioning fuel injectors-Refer to «Fuel Injector Diagnosis (w/CH47976)»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) or «Fuel Injector Diagnosis (w/J39021 or w/Tech 2)»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) .
  11. Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) .
  12. The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
  13. The HO2S signal circuit shorted to voltage
  1. «Air Cleaner Assembly Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Air Cleaner Element Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  3. «Air Cleaner Outlet Duct Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  4. «Evaporative Emission Canister Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  5. «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  6. «Evaporative Emission Canister Vent Solenoid Valve Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  7. «Fuel Hose/Pipes Replacement - Chassis»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  8. «Fuel Injector Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2__fuel-injector-replacement)
  9. «Fuel System Cleaning»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  10. «Fuel Tank Draining»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  11. «Fuel Tank Module Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  12. «Heated Oxygen Sensor 1 Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  13. «Manifold Absolute Pressure Sensor Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  14. «Mass Airflow Sensor/Intake Air Temperature Sensor Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-29l-introduction-2-of-2)
  15. «Throttle Body Assembly Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)

Repair Verification

IMPORTANTAfter repairs, use the scan tool Fuel Trim Reset function in order to reset the Long Term Fuel Trim.
  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. Turn ON the ignition, with the engine OFF.
  4. Clear the DTCs.
  5. Turn OFF the ignition for 60 seconds.
  6. Start the engine.
  7. Duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets, or another DTC is present, refer to the «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) and perform the appropriate diagnostic procedure.
  8. 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0366-to-dtc-p2440) .
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ignition 1 Voltage - Fuse to Splice12
Ignition 1 Voltage - Splice to Injector1P0201, P0202, P0203, P0204, or P0205
Fuel Injector 1 ControlP0201P0201P0201
Fuel Injector 2 ControlP0202P0202P0202
Fuel Injector 3 ControlP0203P0203P0203
Fuel Injector 4 ControlP0204P0204P0204
Fuel Injector 5 ControlP0205P0205P0205
1 Open fuse, Cranks no start 2 Cranks no start

DTC P0201, P0202, P0203, P0204, or P0205

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 between 9-18 volts for 5 seconds.
  3. These DTCs run 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.

DTCs P0201-P0205 are Type B DTCs.

DTCs P0201-P0205 are Type B DTCs.

Performing the Fuel Injector Diagnosis may help isolate an intermittent condition. Refer to Fuel Injector Diagnosis (w/CH47976) or Fuel Injector Diagnosis (w/J39021 or w/Tech 2) .

Schematic Reference

Connector End View Reference

  1. «Component Connector End Views»(/chevrolet/colorado/i-2004-2012/remont/electrical-component-locations/#wiring-systems-and-power-management-component-connector-end-views)
  2. «Inline Harness Connector End Views»(/chevrolet/colorado/i-2004-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-starting-point-and-splice-pack-and-in-line-harness-connector-end-views)

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 35616-200 Test Light Probe Kit

Key ON, observe the DTC information with a scan tool. DTC P0201, P0202, P0203, P0204, or P0205 should not be set.

  1. Ignition OFF, disconnect the X101 fuel injector multi-way connector.
  2. Ignition ON, verify that a test lamp 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 a J 35616-200 between the ignition circuit terminal A and the control circuit ECM harness side, of the appropriate injector listed below: Injector 1 terminal D Injector 2 terminal E Injector 3 terminal F Injector 4 terminal B Injector 5 terminal C
  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 X101 between the ignition circuit terminal A and the control circuit of the appropriate injector listed below: Injector 1 terminal D Injector 2 terminal E Injector 3 terminal F Injector 4 terminal B Injector 5 terminal C If the resistance is not within the specified range, test for a short to ground or an open/high resistance between X101 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. «Fuel Injector Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2__fuel-injector-replacement)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Battery Voltage - Relay Switch Side12
Fuel Pump Supply Voltage123
Fuel Pump Relay ControlP0230P0230P0230
Fuel Pump Relay GroundP0230P0230
Fuel Pump Ground2
1 Open fuel pump fuse, cranks no start 2 Cranks no start 3 Fuel pump operates continuously, discharges battery

DTC P0230

The control module enables the fuel pump relay when the ignition switch is turned ON. The control module will disable the fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition reference pulses are detected. The control module disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON.

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

  1. The engine is cranking or running.
  2. The ignition voltage is between 11-18 volts.
  3. This DTC runs continuously when the above conditions are met.
  1. The control module 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.

DTC P0230 is a Type B DTC.

Conditions for Clearing the DTC

DTC P0230 is a Type B DTC.

Schematic Reference

Connector End View Reference

  1. «Component Connector End Views»(/chevrolet/colorado/i-2004-2012/remont/electrical-component-locations/#wiring-systems-and-power-management-component-connector-end-views)
  2. «Electrical Center Identification Views»(/chevrolet/colorado/i-2004-2012/remont/electrical-component-locations/#wiring-systems-and-power-management-component-connector-end-views)

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 43244 Relay Puller Pliers

IMPORTANTAn open or a short to voltage in the control circuit will cause both the Ckt. Open Test Status and the Ckt. Short Volts Test Status parameters to display Fault.

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.
  2. Ignition ON, verify that a test lamp illuminates between the ground circuit terminal 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 and the control circuit terminal. 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 Grnd 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 and the ground circuit terminal. Command the fuel pump ON with a scan tool. Verify the scan tool fuel pump relay Ckt. Short Grnd 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.

Relay Test

  1. Ignition OFF, disconnect the fuel pump relay.
  2. Test for 70-110 ohms between terminals 85 and 86. If the resistance is not within the specified range, replace the relay.
  3. 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 relay.
  4. Test for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the relay.
  5. Install a 15A fused jumper wire between relay terminal 85 and 12 volts. 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 relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
  2. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) uses information from the crankshaft position (CKP) sensor in order to determine when an engine misfire is occurring and uses information from the camshaft position (CMP) 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 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 (TWC) to overheat, possibly damaging the converter. The malfunction indicator lamp (MIL) will flash ON and OFF when converter overheating, damaging conditions are present and DTC P0300 is set. DTCs P0301-P0305 correspond to cylinders 1-5. If the ECM is able to determine that a specific cylinder is misfiring, the DTC for that cylinder will set.

  1. DTCs P0013, P0014, P0107, P0108, P0117, P0118, P0128, P0220, P0315, P0336, P0502, P0503, P2125, P2135 are not set.
  2. The engine is running.
  3. The engine coolant temperature (ECT) is between -7 to +130°C (+19 to +266°F).
  4. The fuel level is more than 10 percent.
  5. The ECM is not in fuel shut-off or decel fuel cut-off mode.
  6. DTCs P0300, and P0301-P0305 run 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.

DTCs P0300-P0305 are Type B DTCs.

DTCs P0300-P0305 are Type B DTCs.

  1. A misfire may only occur when the engine is under a load or when the engine is cold.
  2. A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect for the following possible sources: A tire or wheel that is out of round or out of balance Variable thickness brake rotors An unbalanced drive shaft Certain rough road conditions A damaged accessory drive component or belt A damaged reluctor wheel

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 26792 HEI Spark Tester

  1. Verify that no other DTCs are set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
  2. Engine idling, verify there is no abnormal engine noise. If there is abnormal engine noise, refer to «Symptoms - Engine Mechanical»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l) .
  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. 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 List.
  1. Verify that the following conditions do not exist: Engine vacuum leaks Fuel pressure that is too low or too high-Refer to «Fuel System Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) . Contaminated fuel-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) . Restricted exhaust system-Refer to «Restricted Exhaust»(/chevrolet/colorado/i-2004-2012/remont/exhaust/#engine-exhaust-system) . If you find any of the above conditions, repair as necessary.
  2. Ignition OFF, remove the ignition coil from the misfiring cylinder, leaving the electrical connector connected.
  3. Install the J 26792 to the boot of an ignition coil and ground.
  4. Attempt to start the engine and observe the J 26792 . The spark tester should spark. If there is no spark, refer to «Electronic Ignition (EI) System Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) for diagnosis of the ignition coil.
  5. 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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2__spark-plug-inspection) . If there is a condition with the spark plug, replace the spark plug.
  6. Exchange the suspected spark plug with another cylinder that is operating correctly.
  7. Operate the engine under the conditions in which the misfire occurred. 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.
  8. If all conditions test normal, test or inspect for the following: A lean or rich fuel injector-Refer to «Fuel Injector Diagnosis (w/CH47976)»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) or «Fuel Injector Diagnosis (w/J39021 or w/Tech 2)»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting) . An engine mechanical condition-Refer to «Symptoms - Engine Mechanical»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l) .
  1. «Ignition Coil Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Spark Plug Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  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 the «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__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/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-dtc-p0366-to-dtc-p2440) .
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The crankshaft position (CKP) system variation learn feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the CKP 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 ECM stores the CKP system variation values after a learn procedure has been performed. If the actual CKP variation is not within the CKP system variation compensating values stored in the ECM, DTC P0300 may set.

  1. The engine is running.
  2. This DTC runs continuously once the above condition is met.

The CKP system variation values are not stored in the ECM memory.

DTC P0315 is a Type A DTC.

DTC P0315 is a Type A DTC.

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

IMPORTANTThe CKP System Variation Learn Procedure may have to be repeated up to 5 times before the procedure is learned.

Perform the CKP System Variation Learn Procedure. Refer to Crankshaft Position System Variation Learn . The scan tool should display Learned this Ignition.

  1. If the CKP System Variation Learn Procedure cannot be performed successfully, inspect for the following conditions
  1. Any worn crankshaft main bearings
  2. A damaged or misaligned reluctor wheel
  3. Excessive crankshaft runout
  4. A damaged crankshaft-Refer to «Crankshaft and Bearing Cleaning and Inspection»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l__crankshaft-and-bearing-cleaning-and-inspection) .
  5. Interference in the signal circuit of the CKP sensor
  6. The ignition switch is in the ON position until there is insufficient system voltage.
  7. An ECM power disconnect with the ignition ON that may have erased the stored value and set DTC P0315
  8. Any debris between the CKP sensor and the reluctor wheel

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provide an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Knock Sensor SignalP0327, P0328P0325P0325P0327, P0328P0326

DTC P0324, P0325, P0326, P0327, or P0328

The knock sensor (KS) 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 KS is located on the intake side of the engine block. The KS produces an AC voltage signal that varies depending on the vibration level during engine operation. The ECM receives the KS signal through 2 isolated signal circuits. The ECM adjusts the spark timing based on the amplitude and the frequency of the KS signal.

DTC P0324

This DTC runs continuously when the engine speed is greater than or equal to 1,800 RPM and engine load is greater than a calibrated amount.

DTC P0326

This DTC runs continuously when

  1. The engine speed is greater than or equal to 1,800 RPM.
  2. The manifold absolute pressure (MAP) is greater than 55 kPa.
  3. DTCs P0120, P0121, P0122, or P0123 are not set.

DTCs P0325, P0327, P0328

These DTCs run continuously when

  1. The engine coolant temperature (ECT) is greater than -40°C (-40°F).
  2. The engine run time is greater than 2 minutes.

P0324

The ECM has detected an internal circuitry fault.

P0325

The KS signal circuits are open or shorted together for 6 seconds.

P0326

  1. The KS signal indicates an excessive engine knock is present.
  2. The ECM commanded spark retard at a given engine load and speed is more than the calibrated value.
  3. The above conditions exist for 6 seconds.

P0327 and P0328

The KS signal circuits are shorted to ground or power.

DTCs P0324, P0325, P0326, P0327, and P0328 are Type B DTCs.

DTCs P0324, P0325, P0326, P0327, and P0328 are Type B DTCs.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)
  5. «Measuring Frequency»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__measuring-frequency)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

P0324

  1. If DTC P0327 and P0328 are also set, preform those diagnostics first.
  2. This DTC indicates an internal control module circuitry failure. Replace the ECM.

P0325, P0327, and P0328

  1. Ignition ON, engine OFF.
  2. Disconnect the KS harness connector.
  3. Measure for 2-5 volts between each of the following circuits and ground on the ECM side of the harness connector. The KS signal circuit, terminal A The KS 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 ECM. If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the ECM.
  4. If the circuits test normal, replace the KS.

P0326

  1. Inspect for a loose or broken vehicle accessory or accessory bracket.
  2. Inspect for excessive engine mechanical noise.
  1. Connect the DMM between the KS signal circuit terminal A and the KS signal circuit terminal B on the sensor side of the KS 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 KS 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 1 Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Symptoms - Engine Controls»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-diagnosis-troubleshooting)
  3. «Symptoms - Engine Mechanical»(/chevrolet/colorado/i-2004-2012/remont/mechanical/#engine-mechanical-37l)
  4. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5-Volt ReferenceP0335P0335
CKP Sensor SignalP0335P0335P0335P0336
Low ReferenceP0335P0335

DTC P0335 or P0336

The crankshaft position (CKP) sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit, and an output signal circuit. The CKP 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 CKP sensor produces an ON/OFF DC voltage of varying frequency, with 58 output pulses per crankshaft revolution. The frequency of the CKP sensor output depends on the velocity of the crankshaft. The CKP 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 CKP sensor. The ECM uses each CKP 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 CKP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and to detect cylinder misfire.

  1. DTC P0365, P0366, P0641 or P0651 is not set.
  2. The engine is cranking or running.
  3. These DTCs run continuously when the above conditions are met.
IMPORTANTThe ECM detects engine movement by sensing the airflow through the mass air flow (MAF) sensor when it is more than 3 g/s, or by sensing CMP sensor pulses.

P0335

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

P0336

  1. The ECM detects that the engine is running, but receives less than 51 or more than 65 CKP sensor pulses each engine revolution for 8 of 10 engine revolutions. OR
  2. The ECM detects that the engine is running, but more than 20 resyncs occur within 25 seconds. OR
  3. The ECM detects that the engine has been running, but the crankshaft does not sync for 0.4 second.

DTCs P0335 and P0336 are Type B DTCs.

DTCs P0335 and P0336 are Type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, inspect the engine wiring harnesses carrying the CKP sensor circuits for the following conditions: 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. Ignition ON, engine OFF, use the live plot function on the scan tool. Select the engine speed parameter and the CKP sensor parameter. Change the minimum spec to 400 RPM for both parameters. Change the maximum spec to 4,000 RPM for both parameters.
  3. Start the engine and observe the scan tool.
  4. Quickly accelerate and release the accelerator pedal several times. Do not accelerate past 4,000 RPM. The two graphed lines on the live plot display should track together across the screen.
  1. Ignition OFF, disconnect the harness connector at the CKP sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal 2 or B 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, engine OFF, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 or A 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. Ignition ON, engine OFF, test for 4.8-5.2 volts between the signal circuit terminal 3 or C 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.
  5. Ignition OFF, connect a fused jumper wire to signal circuit terminal 3 or C.
  6. Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post repeatedly. The CKP Active Counter should increment. If the CKP Active Counter increments, test or replace the CKP sensor. If the CKP Active Counter does not increment, replace the ECM.
  7. Ignition OFF, inspect the CKP sensor for correct installation. Remove the CKP sensor from the engine. Inspect the sensor and the O-ring for damage. If the sensor is loose, inspect the sensor and the O-ring for damage. Replace as necessary.
  8. Inspect the engine for the following conditions: Engine oil for debris Crankshaft reluctor wheel for damage 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.
  9. If all circuits and components test normal, test or replace the CKP sensor.
IMPORTANTYou must perform the Circuit/System Testing before proceeding with Component Testing.
  1. Remove the CKP sensor and inspect the sensor and the O-ring for damage.
  2. Connect the connector to the CKP sensor.
  3. Ignition ON, engine OFF, observe the CKP Active Counter while passing a steel object by the tip of the sensor repeatedly. The CKP Active Counter should increment. If the CKP Active Counter does not increment, replace the CKP sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references)
  2. «Crankshaft Position Sensor Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Ignition Coil 1 Control CircuitP0351P0351P0351P0351P0351
Ignition Coil 2 Control CircuitP0352P0352P0352P0352P0352
Ignition Coil 3 Control CircuitP0353P0353P0353P0353P0353
Ignition Coil 4 Control CircuitP0354P0354P0354P0354P0354
Ignition Coil 5 Control CircuitP0355P0355P0355P0355P0355

DTC P0351-P0355

The ignition system uses individual ignition coil/module assemblies for each cylinder. The engine control module (ECM) controls the individual coils by transmitting timing pulses on the ignition control (IC) circuit of each ignition coil/module to enable a spark event. The ECM monitors each IC circuit for improper voltage levels. Each ignition coil/module has the following circuits

  1. Ignition voltage circuit
  2. Ground
  3. IC circuit
  4. Low reference circuit
  1. The engine is running.
  2. DTCs P0351-P0355 run continuously when the above condition is met.

The ECM detects an open, short to ground, or a short to voltage on the IC circuit or the ignition coil/module for less than 1 second.

DTCs P0351-P0355 are Type B DTCs.

DTCs P0351-P0355 are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Start and idle the engine.
  2. Observe the scan tool Misfire Current Cyl. parameters. This will indicate the affected ignition coil/modules, and if the condition is current.
  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. Turn OFF the ignition.
  2. Disconnect the ECM.
  3. Test the affected IC circuit terminal B for an open, a high resistance, a short to ground and for a short to voltage. If a fault is found, repair the circuit as needed.
  4. Connect the ECM.
  5. Exchange the affected ignition coil/module with the ignition/coil module of a good cylinder.
  6. Start the engine and observe the scan tool. If the DTC or the misfire transfers with the suspect ignition/coil module, replace as needed. If the DTC or the misfire does not transfer with the suspect ignition/coil module, replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Ignition Coil Replacement»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/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/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Exhaust CMP Sensor 5-Volt ReferenceP0641P0365P0641P0366
Exhaust CMP Sensor Low ReferenceP0365
Exhaust CMP Sensor SignalP0365P0365P0365

DTC P0365

The 4X camshaft position (CMP) sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit, and an output signal circuit. The CMP 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 CMP 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 CMP 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 CMP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home operation.

  1. The engine is running.
  2. DTC P0365 runs continuously when the above condition is met.

The ECM does not receive 5 camshaft pulses within 3 seconds

DTC P0365 is a Type B DTC.

DTC P0365 is a Type B DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. With the ignition OFF, inspect the engine wiring harnesses carrying the CMP sensor circuits for the following conditions: 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. With the ignition ON, engine OFF, use the live plot function on the scan tool. Select the engine speed parameter and the CMP sensor parameter. Change the minimum spec to 400 RPM for both parameters. Change the maximum spec to 4,000 RPM for both parameters.
  3. Start the engine and observe the scan tool.
  4. Quickly accelerate and release the accelerator pedal several times. Do not accelerate past 4,000 RPM. The 2 graphed lines on the live plot display should track together across the screen.
  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.
  1. Ignition OFF, disconnect the appropriate camshaft position (CMP) sensor wire harness connector.
  2. Test for less than 1 ohm between the appropriate 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 volts between the appropriate 5-volt reference circuit terminal A and ground. If less than the specified range, test the 5-volt 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-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Ignition ON, test for 4.8-5.2 volts between the appropriate signal circuit terminal C 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 OFF, connect a fused jumper wire to the CMP signal circuit terminal C.
  6. Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post. The CMP active counter parameter on the scan tool should increment. If the CMP active counter increments, replace the CMP sensor. If the CMP active counter does not increment, replace the ECM.
IMPORTANTYou must perform the Circuit/System Testing before proceeding with Component Testing.
  1. Inspect the CMP sensor for correct installation. Remove the CMP 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 CMP sensor.
  2. Connect the CMP sensor connector to the CMP sensor. Turn ON the ignition, with the engine OFF.
  3. Ignition ON, and engine OFF. Observe the CMP Active Counter parameter on the scan tool. Pass a steel object by the tip of the sensor repeatedly. The CMP Active Counter parameter should increment. If the parameter does not increment, replace the CMP sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Camshaft Position Sensor Replacement - Exhaust»(/chevrolet/colorado/i-2004-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-37l-introduction-2-of-2)
  2. «Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Engine Controls Schematics
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Oil Pressure Diagnosis and Testing
• Diagnostic Repair Verification
• Fastener Tightening Specifications
• Crankshaft Balancer Replacement
• Camshaft Position Actuator Diagnosis
• Timing Chain and Sprocket Replacement
• Camshaft Position Exhaust Actuator Replacement
• Powertrain Diagnostic Trouble Code (DTC) Type Definitions
• Heated Oxygen Sensor Resistance Learn Reset Notice
• Heated Oxygen Sensor 2 Replacement
• DTC P0641 or P0651
• Restricted Exhaust
• Temperature Versus Resistance
• Altitude Versus Barometric Pressure
• Cooling System Leak Testing
• Cooling System Draining and Filling (Static Fill)
• Cooling System Draining and Filling (Vac N Fill)
• Heated Oxygen Sensor Wiring Repairs
• Silicon Contamination of Heated Oxygen Sensors Notice
• Alcohol/Contaminants-in-Fuel Diagnosis
• Oil Consumption Diagnosis
• DTC P0420
• Diagnostic Trouble Code (DTC) List - Vehicle
• Symptoms - Engine Exhaust
• Crankcase Ventilation System Inspection/Description
• Fuel Injector Replacement
• Inline Harness Connector End Views
• Relay Replacement (Attached to Wire Harness)
• Spark Plug Inspection
• Crankshaft Position System Variation Learn
• Crankshaft and Bearing Cleaning and Inspection
• Measuring Frequency
• DTC P0106

More articles — Engine Performance