Trying to hunt down a bad wire can get ugly.
You'll get no argument from me about that statement. But if you are capable with a multimeter, a lot of troubleshooting can be done without a tech 2.
The table formatting is lost in the posting of SI pages so this may be harder to interpret than it should be:
2008 Chevrolet Malibu | Malibu (VIN Z) Service Manual | Document ID: 1885110
DTC P0010 or P0013
• 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.
DTC P0010: Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit
DTC P0013: Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit
Diagnostic Fault Information
Short to Ground
Short to Voltage
Intake CMP Actuator Solenoid Control
Intake CMP Actuator Low Reference
Exhaust CMP Actuator Solenoid Control
Exhaust CMP Actuator Low Reference
The camshaft position (CMP) actuator is attached to each camshaft and is hydraulically operated in order to change the angle of the camshaft relative to crankshaft position (CKP). The CMP actuator solenoid is controlled by the control module. The control module sends a pulse width modulated 12-volt signal to a CMP actuator solenoid. The solenoid controls the amount of engine oil flow to a CMP actuator. The CMP actuator can change the camshaft angle a maximum of 25 degrees. The control module increases the pulse width to accomplish the desired camshaft operation.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The ECM detects an open, short to ground, or a short to voltage on the high control circuit or an open on the low reference circuit for more than 0.25 second.
Action Taken When the DTC Sets
DTCs P0010 and P0013 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0010 and P0013 are Type B DTCs.
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Ensure the vehicle has the proper oil viscosity.
Observe the engine oil level. The engine oil level should be within the operating range.
Allow the engine to reach operating temperature.
Command each CMP actuator to 25 percent. The CMP actuator angle desired parameter should match the CMP actuator actual parameter.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Ignition OFF, disconnect the CMP actuator solenoid harness connector at the CMP actuator solenoid.
Test for less than 5 ohms between the low reference circuit terminal B and ground.
⇒ If greater than the specified range, test the low reference circuit for an open/high resistance.
Verify that a test lamp does not illuminate between the low reference circuit terminal B and the control circuit terminal A.
⇒ If the test lamp illuminates, test the control circuit for short to voltage. If the circuit tests normal, replace the ECM.
Remove the test lamp.
Command the CMP Actuator Sol. ON with a scan tool. Verify the scan tool CMP Sol Ckt Short Gnd Test status is OK.
⇒ If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
Install a 3A fused jumper wire between the control circuit terminal A and the low reference circuit terminal B. Command the CMP Actuator Sol. ON with a scan tool. Verify the scan tool CMP Sol Ckt Short Gnd Test status is Fault.
⇒ 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 solenoid.
Measure the resistance of each CMP actuator solenoid valve assembly. Resistance should be between 8-12 ohms.
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.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• Camshaft Position Actuator Solenoid Valve Replacement
• Control Module References for replacement, setup, and programming
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