P0021
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 Descriptor
DTC P0011
-
Camshaft Position System Performance
Diagnostic Fault Information
Circuit/System Description
The camshaft position (CMP) actuator system enables the engine control module (ECM) to change the timing of the camshaft while the engine is operating. The ECM controls the camshaft position actuator magnet duty cycle by controlling the amount of ON time. The magnet controls the amount of engine oil flow to the CMP actuator by extending a pintle within the solenoid. The pintle acts against a spool valve in the CMP actuator mechanism which is attached to the front of the camshaft. As the spool valve is moved, oil is directed to the CMP actuator, which rotates the camshaft. The ECM can only command the camshaft position actuator to retard the valve timing from the camshaft park position, or advance the valve timing back to the park position. The total range of valve timing command is 26 degree as measured at the camshaft or 52 degree as measured at the crankshaft.
The ECM controls the camshaft position actuator magnet 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 P0010, P0016, P0335, P0336, P0340, or P0341 is not set.
* The engine is running.
* The system voltage is greater than 11 V.
* The camshaft position actuator is enabled and commanded greater than 0 degrees.
* The power take off (PTO) is not active - If equipped.
* The desired camshaft position does not vary greater than 7.5 degrees for 2 s.
* DTC P0011 runs continuously when the above conditions are met.
Conditions for Setting the DTC
The ECM detects the difference between the desired camshaft position angle and the actual camshaft position angle is greater than 8 degrees,
Action Taken When the DTC Sets
* DTC P0011 is a type B DTC.
* The camshaft position actuator is commanded to the park position.
Conditions for Clearing the DTC
DTC P0011 is a type B DTC.
Diagnostic Aids
* The engine oil condition has a major impact on the camshaft actuator system.
* 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.
* Inspect the engine for any recent engine mechanical repairs. An incorrectly installed camshaft, camshaft actuator, or timing chain can cause this DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics ((L99/LS3)) [1][2]Electrical DiagramsEngine Controls Schematics ((LSA)) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Camshaft Actuator System Description Description and Operation
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 Control Module References 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 actuator system. Verify that the engine has the correct oil level and the correct oil pressure before continuing with this diagnostic.
* The engine oil condition has a major impact on the camshaft actuator system. Debris in the oil can interfere with the camshaft position actuator solenoid and the mechanical camshaft actuator operation. Inspect for dirty or degraded crankcase oil. 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 Remaining parameter. Advise the customer an oil change may be required.
1. Ignition ON, observe the scan tool DTC information. Verify that none of the following DTCs are set. DTC P0335, P0336, P0340, P0341, P0521, P0522, P0523, P1516, P2101, P2119, or P2176.
• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Engine idling at the normal operating temperature. Monitor the engine oil pressure parameter with a scan tool. The engine oil pressure should be greater than the minimum hot oil pressure values. Refer to Engine Mechanical Specifications (6.2L LS3) Service Limits & General SpecificationsEngine Mechanical Specifications (6.2L L99) Service Limits & General SpecificationsEngine Mechanical Specifications (6.2L LSA) Service Limits & General Specifications.
Note:
If a crankshaft or camshaft position sensor DTC is set, the Camshaft Position Actuator output control will not function.
3. Command the camshaft position actuator solenoid to 20° with a scan tool. The Desired Camshaft Position parameter should match the Camshaft Position parameter.
4. 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°.
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 Q6 camshaft position actuator magnet harness connector X109.
Note:
Testing for steps 2-4 is performed on the ECM side of the harness connector X109.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the low reference circuit terminal E 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 K20 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 D and ground.
• If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
4. Connect the DMM black lead to the control circuit terminal D. 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 OL 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 K20 ECM.
Note:
Testing for steps 5 and 6 is performed on the engine side of the harness connector X109.
5. Ignition OFF, test for infinite resistance between the control circuit terminal D and ground.
• If not the specified value, repair the control circuit for a short to ground.
6. Test for 5.0-9.0 ohms between the control circuit terminal D and the low reference circuit terminal E.
• If less than the specified range, test for a short between the control circuit and the low reference circuit. If the circuits/connections test normal, test or replace the Q6 camshaft position actuator magnet.
• If greater than the specified range, test the control circuit and the low reference for an open/high resistance. If the circuits/connections test normal, test or replace the Q6 camshaft position actuator magnet.
7. Remove the Q6 camshaft position actuator magnet. Perform the Camshaft Position Actuator Magnet Cleaning and Inspection. The camshaft position actuator magnet should pass the inspection.
• If the inspection fails, replace the Q6 camshaft position actuator magnet.
8. Perform the Camshaft Position Actuator Solenoid Valve Inspection (Off-Vehicle) and Camshaft Position Actuator Solenoid Valve Inspection (On-Vehicle). The Camshaft Position Actuator Solenoid Valve should pass the inspection.
• If the inspection fails, replace the camshaft position actuator solenoid valve.
9. If all circuits and components test normal, replace the mechanical camshaft position actuator.
Component Testing
Static Test
1. Ignition OFF, remove the Q6 camshaft position actuator magnet.
2. Test for 5.0-9.0 ohms between the solenoid control terminal 2 and the low reference terminal 1 at the Q6 camshaft position actuator magnet.
• If not within the specified range, replace the Q6 camshaft position actuator magnet.
3. Test for infinite resistance between each terminal of the magnet and the magnet housing.
• If not the specified value, replace the Q6 camshaft position actuator magnet.
Dynamic Test
1. Remove the Q6 camshaft position actuator magnet.
Note:
* The camshaft position actuator magnet pintle should be facing downward for this test.
* Do not allow electrical current to flow through the camshaft position actuator magnet for greater than 1-2 s.
2. Install a 20 A fused jumper wire between the control circuit terminal 2 and 12 V. Momentarily install a jumper wire between the low reference terminal 1 and ground. The pintle should extend.
• If the function does not perform as specified, replace the Q6 camshaft position actuator magnet.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Camshaft Position Actuator Replacement Service and Repair
* Camshaft Position Actuator Solenoid Valve Replacement Service and Repair
* Camshaft Position Actuator Magnet Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, programming, and setup