P0014
DTC P0014
Circuit Description
The camshaft position (CMP) actuator system is a hydraulically actuated phase shifting mechanism. The powertrain control module (PCM) supplies the ignition positive driver and ground circuits. A pulse width modulated (PWM) driver controls the amount that the camshaft actuator solenoid assembly advances or retards the exhaust camshaft. The exhaust camshaft is commanded to a maximum retard position of 25 degrees. When the exhaust camshaft is retarded at the maximum rate, the duty cycle of the signal is at 100 percent. The maximum advance rate has a 0 percent duty cycle. Other than when the camshaft is at full advance, a 50 percent duty cycle is used to maintain a steady retard angle. If the desired and actual cam phase angle error exceeds its tolerance value for a certain amount of time, then DTC P0014 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0014 Exhaust Camshaft Position (CMP) System Performance
Conditions for Running the DTC
^ The engine speed is greater than 1,350 RPM.
^ The PCM has enabled the camshaft position (CMP) actuator.
^ The camshaft position (CMP) actuator is steady for 3 s.
^ The system voltage is greater than 11 V.
^ DTC P0014 runs continuously once the above conditions are met.
Conditions for Setting the DTC
The PCM detects the difference between the desired CAM phase angle and the actual CAM phase angle is greater than 3.75 degrees for greater than 3 s.
Action Taken When the DTC Sets
^ The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
^ The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
^ A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
^ Clear the MIL and the DTC with a scan tool.
Diagnostic Aids
^ The scan tool cam phase control function increments the cam phaser in 10 percent increments. Each increment equates to 2.5 degrees of cam phasing. A cam phase angle of 15 degrees is achieved by commanding the phaser with the scan tool to 60 percent.
^ Inspect any engine mechanical work that has been performed recently. Verify that the engine timing has not been altered.
^ If this DTC is set along with any crankshaft position (CKP) or camshaft position (CMP) sensor DTCs, then both the CKP and CMP sensor DTCs should be diagnosed prior to performing this diagnostic. The PCM uses both inputs to determine the actual camshaft position.
^ Inspect the following items:
- A loose CMP sensor causing a variance in the sensor signal
- A loose CKP sensor causing a variance in the sensor signal
- Excessive free play in the timing chain and gear assembly
- Debris or contamination interfering with the CMP actuator solenoid valve assembly
- Debris or contamination interfering with the mechanical CMP actuator assembly
^ Engine oil has a major impact upon the camshaft actuation system's responsiveness. Oil temperature, viscosity, and quality can slow and/or inhibit the phaser's ability to reach a desired phase angle.
Reference Information
Schematic Reference
Engine Controls Schematics Electrical Diagrams
Connector End View Reference
Powertrain Control Module Connector End Views Connector Views
Engine Controls Connector End Views Connector Views
Description and Operation
Camshaft Actuator System Description Description and Operation
Electrical Information Reference
^ Circuit Testing General Electrical Diagnostic Procedures
^ Connector Repairs General Electrical Diagnostic Procedures
^ Testing for Intermittent Conditions and Poor Connections General Electrical Diagnostic Procedures
^ Wiring Repairs General Electrical Diagnostic Procedures
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.
1. Verify the engine has the correct oil pressure. Refer to Oil Pressure Diagnosis and Testing. Testing and Inspection
Note: If a crankshaft or camshaft position sensor DTC is set, the Camshaft Position Actuator output control will not function.
2. Ignition ON, observe the scan tool DTC information. Verify DTC P0013, P0017, P0335, P0336, P0365, P0366, or P0520 are not set.
--> If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis. Diagnostic Trouble Code Descriptions
3. Engine idling at the normal operating temperature. Increase the engine speed to 1,500 RPM. Command the camshaft position actuator solenoid to 90 percent with a scan tool. The Cam Phase Angle Desired parameter should match the Cam Phase Angle Actual parameter.
4. Observe the Cam Phase Angle Variance parameter with a scan tool. The Cam Phase Angle Variance will increment for several seconds, until the Camshaft Position value matches the Cam Phase Angle Desired. The Camshaft Position Variance value should return to 0°.
5. 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 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 control module.
Note: A test lamp must be used for this test. The control circuit is pulled-up to a low current voltage.
3. Ignition ON, engine OFF, verify that a test lamp does not illuminate between the control circuit and ground.
--> If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the control module.
4. Test for B+ between the control circuit and ground.
--> If less than the specified value, test the control circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the control module.
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 Replacement. Service and Repair
^ Proper operation of the mechanical CMP actuator assembly. A stuck or slow responding actuator may cause this DTC.
--> 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 circuit and the low reference circuit 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 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 repair.
^ Camshaft Position Actuator Solenoid Valve Replacement Overhaul
^ Camshaft Timing Chain and Sprocket Replacement Service and Repair
^ Control Module References for replacement, programming, and setup Programming and Relearning