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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1146 (Engine Controls And Fuel - 3.6L - DTC P0008 To DTC P0161) >> DTC P0010, P0013, P0020, P0023, P2088, P2089, P2090, P2091, P2092, P2093, P2094, or P2095 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate camshaft position (CMP) actuator solenoid.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.
  3. Connect a DMM, set on the diode setting, between the control circuit terminal 2 and ground. The voltage should be greater than 2.0 volts.
    • If the DMM displays OL, test the control circuit for a short to voltage or an open/high resistance. If the circuit/connections test normal, replace the ECM.
    • If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  4. Command the CMP actuator solenoid ON and OFF with a scan tool. The DMM should transition from greater than 2 volts when commanded OFF to less than 1 volt, when commanded ON.
    • If the circuit voltage does not correspond to the specified values, replace the ECM.
  5. If all circuits/connections test normal, test or replace the CMP actuator solenoid.
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