GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0365: Exhaust Camshaft Position (CMP) Sensor Circuit

DTC P0367: Exhaust Camshaft Position (CMP) Sensor Circuit Low Voltage

DTC P0368: Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit

Short to Ground

High Resistance

Open

Short to Voltage

Signal Performance

5-Volt Reference

P0342, P0365, P0367

P0365

P0365, P0368

--

P0365

CMP Sensor Signal High

P0365, P0367

P0365, P0368

P0365, P0368

P0365, P0368

P0365

CMP Sensor Signal Low

--

P0365, P0368

P0365, P0368

--

P0365

Circuit/System Description

The camshaft position (CMP) sensor is a magnetic resistance element (MRE) design with a 5-volt reference, a signal high and signal low circuit. When the signal rotor on the exhaust camshaft rotates past the CMP sensor, the electrical resistance of the sensor's magnetic field changes and the output voltage to the control module switches between high and low.

Conditions for Running the DTC

P0365

    • The engine is cranking or running.
    • The ignition voltage is greater than 11 volts while cranking.
    • DTC P0365 runs continuously once the above condition is met.

P0367 and P0368

    • Engine speed is greater than 600 RPM.
    • DTC P0367 and P0368 run continuously once the above condition is met.

Conditions for Setting the DTC

P0365

    • No CMP sensor signal is detected by the PCM.
        OR
    • The intake CMP sensor signal voltage is less than 0.3 volts or greater than 4.7 volts for greater than 4 seconds.

P0367

The intake CMP sensor signal voltage is less than 0.3 volts for greater than 4 seconds.

P0368

The intake CMP sensor signal voltage is greater than 4.7 volts for greater than 4 seconds.

Action Taken When the DTC Sets

DTCs P0365, P0367, and P0368 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0365, P0367, and P0368 are Type A DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electronic Ignition (EI) System Description

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

    Important: If you were sent here from Engine Cranks but Does Not Run, proceed to Circuit/System Testing.

  1. Attempt to start the engine, observe the DTC information with a scan tool. DTC P0365, P0367, and P0368 should not set.
  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.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the exhaust CMP sensor.
  2. Ignition OFF, test for less than 10 ohms between the CMP sensor signal low circuit terminal 2 and ground G104.
  3. If greater than the specified range, test the signal low circuit for an open/high resistance. If the circuit tests normal, replace the PCM.
  4. Ignition ON, test for 4.8-5.2 volts between the CMP sensor 5-volt reference circuit terminal 3 and ground.
  5. If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground.
    If greater than the specified range, test the 5-volt reference for a short to voltage. If the circuit tests normal, replace the PCM.
  6. Ignition ON, test for 4.8-5.2 volts between the CMP sensor signal high circuit terminal 1 and ground.
  7. If less than the specified range, test the signal high circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the PCM.
    If greater than the specified range, test the signal high circuit for a short to voltage. If the circuit tests normal, replace the PCM.
  8. Install a 3 A fused jumper wire to the signal high circuit terminal 1.
  9. Note: The engine may stall during this procedure.

  10. Engine idling, touch the end of the fused jumper wire to ground. Verify that DTC P0367 sets.
  11. If DTC P0367 does not set, replace the PCM.
  12. Remove the CMP sensor. Inspect the camshaft for a damaged CMP sensor reluctor wheel.
  13. If a condition is found, repair as necessary.
  14. If all circuits test normal, replace the CMP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Camshaft Position Sensor Replacement - Exhaust
    •  Control Module References for control module replacement, setup, and programming