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P0014




DTC P0014

Diagnostic Instructions

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

DTC Descriptor
DTC P0014
- Exhaust Camshaft Position (CMP) System Performance

Diagnostic Fault Information





Circuit/System Description

The camshaft position actuator system enables the Engine Control Module (ECM) to change the timing of the exhaust camshaft while the engine is operating. The Camshaft Position Actuator Solenoid Valve signal from the ECM is pulse width modulated (PWM). The ECM controls the Camshaft Position Actuator Solenoid Valve duty cycle by controlling the amount of solenoid valve ON time. The Camshaft Position Actuator Solenoid Valve controls the advance or the retard of the camshaft. The Camshaft Position Actuator Solenoid Valve controls the oil flow that applies the pressure to advance or retard the camshaft.

The ECM controls the Camshaft Position Actuator Solenoid Valve by suppling a 12 V pulse width modulated (PWM) signal. The ECM supplies a ground to the low reference circuit.

Conditions for Running the DTC

* DTC P0017, P0335, P0336, P0365, P0366 are not set.
* The engine is running.
* The system voltage is between 11-18 volts.
* The ECM has enabled the CMP actuator and commanded greater than 0 degrees.
* DTC P0014 runs continuously when the above conditions are met.

Conditions for Setting the DTC

The difference between the desired CMP and the actual CMP angle is more than 3.75 degrees for 13.5 s.

Action Taken When the DTC Sets

DTC P0014 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P0014 is a Type B DTC.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Note:
* The engine oil level and the oil pressure are critical to the correct operation of the camshaft position (CMP) actuator system. Verify that the engine has the correct oil level and the correct oil pressure before continuing with this diagnostic. Refer to Oil Pressure Diagnosis and Testing (Oil Pressure Diagnosis and Testing).
* If a crankshaft or camshaft position sensor DTC is set, the Camshaft Position Actuator output control will not function.

1. Ignition ON, observe the scan tool DTC information. Verify that none of the following DTCs are set. DTC P0335, P0336, P0365, P0366, or P0520.
2. Engine idling at the normal operating temperature. Command the camshaft position actuator solenoid to 20° with a scan tool. The Desired Camshaft Position parameter should match the Camshaft Position parameter.
3. Observe the Camshaft Position Variance parameter with a scan tool. The Camshaft Position Variance will increment for several seconds, until the Camshaft Position value matches the Desired Camshaft Position value. The Camshaft Position Variance value should return to 0°.
4. 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 are captured in the Freeze Fame/Failure Records Data List.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the Camshaft Position Actuator Solenoid Valve.
2. Test for less than 5 ohm between the low reference circuit terminal B and ground.

• If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

Note: A test lamp must be used for this test. The control circuit is pulled-up to a low current voltage, B+ on the control circuit is normal.

3. Ignition ON, Engine OFF, verify that a test lamp does not illuminate between the control circuit terminal A and ground.

• If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Connect the DMM black lead to the control circuit terminal A. Connect the DMM red lead to B+. Set the DMM on the diode setting. Command the CMP actuator solenoid ON and OFF with a scan tool. The DMM should transition from 2.5-3.5 V when commanded OFF to less than 1 V when commanded ON.

• If the circuit voltage does not correspond to the specified values, test the control circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.

5. Remove the Camshaft Position Actuator Solenoid Valve. Inspect the Camshaft Position Actuator Solenoid Valve and mounting area for the following conditions:

* For a torn, restricted, mis-positioned, or missing screens at the Camshaft Position Actuator Solenoid Valve
* For engine oil leaks between the oil sealing lands of the Camshaft Position Actuator Solenoid Valve. Inspect the lands of the Camshaft Position Actuator Solenoid Valve for nicks
* For oil seepage at the Camshaft Position Actuator Solenoid Valve connector

• If a condition is found, replace Camshaft Position Actuator Solenoid Valve.

6. Inspect for the following conditions:

* Excessive timing chain play-Refer to Camshaft Timing Chain and Sprocket Cleaning and Inspection (50. Camshaft Timing Chain and Sprocket Cleaning and Inspection).
* For the correct operation of the mechanical CMP actuator assembly.

• If a condition is found, repair as necessary.

7. If all circuits/components test normal, test or replace the Camshaft Position Actuator Solenoid Valve.

Component Testing

1. Ignition OFF, disconnect the harness connector at the Camshaft Position Actuator Solenoid Valve.
2. Test for 5-13 ohm between the control terminal A and the low reference circuit terminal B of the Camshaft Position Actuator Solenoid Valve.

• If not within the specified range, replace the Camshaft Position Actuator Solenoid Valve.

3. Test for infinite resistance between each terminal and the Camshaft Position Actuator Solenoid Valve housing.

• If not the specified value, replace the Camshaft Position Actuator Solenoid Valve.

4. 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 (Verification Tests) after completing the diagnostic procedure.

* Camshaft Position Actuator Solenoid Valve Replacement (Service and Repair)
* Camshaft Position Exhaust Actuator Replacement (Camshaft Position Exhaust Actuator Replacement)
* Control Module References (Programming and Relearning) for Engine Control Module replacement, setup, and programming

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