For 1990-2009 cars

### 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 P0010: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit
DTC P0011: Intake Camshaft Position (CMP) System Performance

### Diagnostic Fault Information

Circuit | Short to Ground | Open | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Intake CMP Actuator Solenoid Control | P2088 | P0010 | P2089 | P0011
Intake CMP Actuator Solenoid Ignition 1 Voltage | -- | P0010 | -- | --

### 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 50 degrees. The control module increases the pulse width to accomplish the desired camshaft operation.

### Conditions for Running the DTC

#### P0010

The engine is running.

#### P0011

• | The engine speed is more than 1,350 RPM.

• | The engine control module (ECM) has enabled the CMP actuator.

• | The system voltage is more than 11 volts.

• | DTC P0011 runs continuously when the above conditions are met.

### Conditions for Setting the DTC

#### P0010

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

#### P0011

• | The control module has enabled the CMP actuator.

• | The difference between the desired CMP actuator angle and the actual CMP actuator angle is more than 6 degrees.

• | The CMP actuator is steady for 3 seconds.

• | The condition is present for 13.5 seconds.

### Action Taken When the DTC Sets

DTCs P0010 and P0011 are Type B DTCs.

### Conditions for Clearing the MIL/DTC

DTCs P0010 and P0011 are Type B DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### 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: 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, 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 Int. CMP variance parameter. The Int. CMP variance will rise for 1-2 seconds until the Int. CMP Angle parameter matches the Desired Int. CMP parameter. The Int. 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 24 degrees. The desired CMP parameter should match the CMP Angle parameter.
8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

### Circuit/System Testing

1. Ignition OFF, disconnect the Int. CMP actuator solenoid harness connector at the CMP actuator solenoid.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A and ground.

⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

3. Connect a test lamp between the control circuit terminal B and the ignition circuit terminal A.
4. Command the Int. CMP actuator solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

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

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

5. Determine that the vehicle has the correct engine oil. Refer to Service and Appearance Care in the owners 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. 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

7. Inspect for the following conditions:

• | Excessive timing chain play

• | Proper installation of the CMP actuator assembly

8. If all circuits test normal, test or replace the CMP actuator solenoid.

### Component Testing

1. Measure the resistance of CMP actuator solenoid valve assembly. Resistance should be between 8-15 ohms.
2. Connect a jumper wire between the CMP actuator solenoid control circuit at the solenoid and a good ground. Connect a fused jumper wire to the CMP actuator solenoid ignition voltage circuit at the solenoid. Momentarily touch the fused jumper to B+. The spool valve should move from fully closed to fully opened position.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Camshaft Position Sensor Replacement - Intake

• | Control Module References for replacement, setup, and programming