• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
CMP Actuator Solenoid High Control | P0010 | P0010 | P0010 | P0011 |
CMP Actuator Solenoid Low Reference | -- | P0010, P0011 | -- | -- |
Display Parameters | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine speed greater than 900 RPMs in Park Parameter Normal Range: 0-100% | |||
CMP Command | 0% | 0% | 0% |
Display Parameters | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine speed greater than 900 RPMs in Park Parameter Normal Range: 0-31° | |||
Desired CMP | 0° | 0° | 0° |
Display Parameters | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine speed greater than 900 RPMs in Park Parameter Normal Range: 0-31° | |||
CMP Angle | 0° | 0° | 0° |
Display Parameters | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine speed greater than 900 RPMs in Park Parameter Normal Range: 0° | |||
CMP Variance | 0° | 0° | 0° |
The camshaft position (CMP) actuator solenoid is controlled by the engine control module (ECM). The ECM sends a 12V pulse width modulated (PWM) signal to the CMP actuator solenoid. The CMP actuator solenoid positions the CMP actuator spool valve to control the amount of pressurized engine oil, which enters into the CMP actuator assembly. A low reference wire circuit between the CMP actuator solenoid and the ECM completes the electrical circuit. The frequency of the PWM signal is fixed at 150 Hz. The ECM can only command the CMP actuator to advance the valve timing from the camshaft park position, or retard the valve timing back to the park position. The total range of valve timing command is 23 degrees as measured at the camshaft, or 46 degrees as measured at the crankshaft.
• | DTC P0010, P0016, P0335, P0336, P0340, or P0341 is not set. |
• | The engine is running. |
• | The system voltage is between 11-18V. |
• | The CMP actuator is enabled. |
• | The power take off (PTO) is not active. |
• | The rate of change in the camshaft position is less than 7.5 degrees for 3.35 seconds. |
• | The ECM detects resistance greater than 2 Ω on the low reference circuit. |
• | The ECM detects that the CMP Angle position is more than 8 degrees difference than the Desired CMP position. |
• | DTC P0011 is a Type B DTC. |
• | The CMP actuator is commanded to the Park position. |
DTC P0011 is a Type B DTC.
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test.
Camshaft Actuator System Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle for DTC P254F. |
Note:
• You must perform the Circuit/System Verification first. • Incorrect engine oil viscosity, aftermarket engine oil additives, or engine oil that is overdue for changing, can greatly affect the performance of the camshaft actuator.
⇒ | If the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle for DTC P254F. |
⇒ | If greater than 3 Ω, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If not the specified value, test the control circuit for a short tog round. If the circuit tests normal, replace the ECM. |
⇒ | If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If all circuits test normal, test or replace the CMP actuator. |
⇒ | If the CMP solenoid and the circuit test normal, refer to Camshaft Position Actuator Magnet Cleaning and Inspection and Camshaft Position Actuator Solenoid Valve Inspection. |
Note: You must perform the Circuit/System Testing first.
Test for 5.9 and 7.7 Ω at 20°C (68°F) between the solenoid control terminal 2 and the low reference terminal 1 at the CMP actuator solenoid.
⇒ | If the resistance is not within the specified range, replace the CMP actuator solenoid. Refer to Camshaft Position Actuator and Solenoid Valve Installation. |
Note: Do not allow electrical current to flow through the CMP actuator solenoid for more than 1-2 seconds, or damage to the solenoid may occur.
Point the CMP actuator solenoid vertically towards a shop towel. Connect one end of a fused jumper wire to the CMP actuator solenoid control circuit terminal 2 and 12V. Connect a second jumper wire to the low reference circuit terminal 1 and momentarily connect to ground. The CMP actuator solenoid should immediately extend.
⇒ | If the CMP actuator solenoid pintle does not extend, replace the CMP actuator solenoid. Refer to Camshaft Position Actuator and Solenoid Valve Installation. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.