Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

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

P0010

P0011

P0010

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

P0011

1. The CMP angle from the ECM is stable. If the CMP angle varies more than 7.5 cam degrees, then a stability timer of 2 seconds must expire before evaluating fail condition.
2. The difference between the desired CMP and the actual CMP angle is more than 8 degrees for 20 seconds during a 320-second sample.

DTC P0010 and P0011 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Scan Tool Reference

Description and Operation

Important: The supply of clean pressurized engine oil to the CMP actuator is essential to CMP actuator performance.

1. Observe the engine oil level. The engine oil level should be within operating range. Refer to Approximate Fluid Capacities .
2. Ensure that the vehicle has the correct engine oil and is not old, burnt or contains additives. Refer to Checking Things Under the Hood in Service and Appearance Care within the Owner's Manual.

⇒	If the vehicle has the incorrect engine oil, is old, burnt, or contains additives then change the oil and filter.

3. Test the engine oil pressure for correct operation. Refer to Oil Pressure Diagnosis and Testing .
4. Allow the engine to reach operating temperature.
5. Set the parking brake and place the vehicle in park for automatic, or neutral for manual.
6. Observe the CMP variance parameter. The CMP Variance will rise for 1-2 seconds until the CMP Angle parameter matches the Desired CMP parameter. The CMP Variance should again return to 0 degrees.

Important: The engine will run rough and may require throttle input to keep running.

7. Command the CMP actuator to 20 degrees. The Desired CMP parameter should match the CMP Angle parameter.

Important: You must complete the Circuit/System Verification before proceeding with Circuit/System Testing.

P0010

1. Ignition OFF, disconnect the CMP actuator solenoid harness connector at the CMP actuator solenoid.
2. Test for less than 1 ohm of resistance between the low reference circuit and ground.

⇒	If greater than 1 ohm, test the low reference for an open/high resistance. If the circuit tests normal replace the ECM.

3. Connect a test lamp between the high control circuit and the low reference circuit terminal B.
4. Ignition ON engine OFF.
5. Command the CMP actuator solenoid ON and OFF. The test lamp should turn ON and OFF when changing between commanded states.

⇒	If the test lamp is always ON, test the high control circuit for a short to voltage. If the circuit tests normal replace the ECM.

⇒	If test lamp is always OFF, test the control circuit for a short to ground, an open/high resistance. If the circuit tests normal replace the ECM.

6. If all circuits test normal, test or replace the CMP Actuator solenoid.

P0011

Static Test

1. Ignition OFF, disconnect the CMP actuator solenoid harness connector at the CMP actuator solenoid.
2. Test for 4.8-5.2 ohms of resistance between the high control and the low reference of the CMP actuator solenoid.

⇒	If the resistance is not within the specified range, replace the CMP actuator solenoid.

Dynamic Test

Important: Do not allow the solenoid to be energized for more than 2 seconds.

1. Install fused jumper wire between the high control and 12 volts. Install a jumper wire between the low reference and momentarily connect to ground.
2. Point the CMP actuator solenoid towards a shop towel. Observe the operation of the solenoid immediately extends.

⇒	If the function does not perform as specified, replace the CMP actuator solenoid.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.