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 P0013: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit
DTC P2088: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage
DTC P2089: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage
DTC P2090: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage
DTC P2091: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Intake CMP Actuator Solenoid Control | P2088 | P0010 | P2089 | P000A
Intake CMP Actuator Supply Voltage | -- | P0010 | -- | --
Exhaust CMP Actuator Solenoid Control | P2090 | P0013 | P2091 | P000B, P0014
Exhaust CMP Actuator Supply Voltage | -- | 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 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 20 degrees. The control module increases the pulse width to accomplish the desired camshaft operation.

### Conditions for Running the DTC

• | DTC P0606 is not set.

• | The ignition is ON.

• | The ignition voltage is between 10-16 volts.

### Conditions for Setting the DTC

#### P0010, P0013

The ECM detects an open in the CMP actuator solenoid circuits for greater than 1 second or a cumulative of 5 seconds when the solenoid is commanded OFF.

#### P2088, P2090

The ECM detects a short to ground in the CMP actuator solenoid circuits for greater than 1 second or a cumulative of 5 seconds when the solenoid is commanded OFF.

#### P2089, P2091

The ECM detects a short to voltage in the CMP actuator solenoid circuits for greater than 1 second or a cumulative of 5 seconds when the solenoid is commanded ON.

### Action Taken When the DTC Sets

DTCs P0010, P0013, P2088, P2089, P2090, P2091 are Type B DTCs.

### Conditions for Clearing the MIL/DTC

DTCs P0010, P0013, P2088, P2089, P2090, P2091 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

#### 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. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

### Circuit/System Testing

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

3. Ignition OFF, test for less than 5 ohms between the control circuit terminal 1 and the corresponding ECM terminal.

⇒ | If greater than the specified range, test the control circuit for an open/high resistance.

4. Test for 7-13 ohms between the control circuit terminal 1 and the ignition terminal 2 of the CMP actuator solenoid. The value is valid for a temperature range from 0-100°C (32-212°F).

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

5. If all circuits test normal, test or replace the ECM.

### Component Testing

1. Measure the resistance of each CMP actuator solenoid valve assembly. Resistance should be between 7-13 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 Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Camshaft Position Actuator Solenoid Valve Replacement

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