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P0024




DTC P0011, P0014, P0021, or P0024

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 Descriptors
DTC P0011
- Intake Camshaft Position (CMP) System Performance Bank 1

DTC P0014
- Exhaust Camshaft Position (CMP) System Performance Bank 1

DTC P0021
- Intake Camshaft Position (CMP) System Performance Bank 2

DTC P0024
- Exhaust Camshaft Position (CMP) System Performance Bank 2

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

* DTCs P0010, P0013, P0016, P0017, P0018, P0019, P0020, P0023, P0335, P0336, P0340, P0341, P0345, P0346, P0365, P0366, P0390, or P0391 are not set.
* The engine is operating.
* The desired CMP position is greater than 0 degrees.
* The CMP angle is stable within 4.5 degrees.
* The system voltage is between 11-18 volts.
* DTC P0011, P0014, P0021, P0024 runs continuously once the above conditions are met.

Conditions for Setting the DTC

The difference between the desired CMP and the actual CMP angle is greater than 5 degrees for 10 seconds.

Action Taken When the DTC Sets

* DTCs P0011, P0014, P0021, P0024 are Type B DTCs.
* The CMP actuators are commanded to the home or parked position.

Conditions for Clearing the MIL/DTC

DTCs P0011, P0014, P0021, P0024 are Type B DTCs.

Diagnostic Aids

* Inspect the engine for any recent engine mechanical repairs. An incorrectly installed camshaft, camshaft actuator, or timing chain can cause this DTC to set.
* The engine oil condition has a major impact on the camshaft actuator system.
* For a detailed inspection of the cam actuator system, refer to Camshaft Timing Drive Components Cleaning and Inspection (65. Camshaft Timing Drive Components Cleaning and Inspection).
* A low oil level condition may set this DTC. The engine may require an oil change. Inquire with the customer when the last oil change was performed. You may also monitor the scan tool Engine Oil Life parameter. Advise the customer an oil change may be required.

Reference Information
Schematic Reference

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

Component Connector End Views (Connector End Views By Name)
Description and Operation

Camshaft Actuator System Description (Camshaft Actuator System)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
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, P0340, P0341, P0345, P0346, P0365, P0366, P0390, or P0391.

• If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) for further diagnosis.

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 appropriate Camshaft Position Actuator Solenoid Valve.
2. Test for less than 5 ohm between the low reference circuit terminal 2 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 1 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 1. 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. Ignition OFF, swap the Camshaft Position Actuator Solenoid Valve with a Camshaft Position Actuator Solenoid Valve that is operating correctly.

Note: This step is testing the mechanical CMP actuator for the camshaft that set the DTC.

7. Engine idling. Command the appropriate Camshaft Position Actuator from 0 degrees to 20 degrees and back to zero while observing the appropriate scan tool Camshaft Position Variance parameters. The Camshaft Position Variance should be less than 2 degrees in each of the commanded states.

• If greater than the specified value, replace the mechanical camshaft position actuator.

8. If all circuits/connections 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 1 and the low reference circuit terminal 2 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.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Camshaft Position Actuator Replacement - Bank 1 (Camshaft Position Actuator Replacement - Bank 1)
* Camshaft Position Actuator Replacement - Bank 2 (Camshaft Position Actuator Replacement - Bank 2)
* Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Intake (Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Intake)
* Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Exhaust (Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Exhaust)
* Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Intake (Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Intake)
* Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Exhaust (Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Exhaust)
* Control Module References (Programming and Relearning) for ECM replacement, programming, and setup

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