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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 365 (Engine Controls And Fuel - Hybrid (LZ1) - DTC P0351 Through DTC P3449 And Troubleshooting) >> Diagnostic Information and Procedures >> DTC P1516, P2101, P2119, or P2176 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING:

    Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.

  1. Ignition OFF, inspect the throttle body for the following conditions:
    • A throttle blade that is not in the rest position
    • A throttle blade that is binding open or closed
    • A throttle blade that is free to move open or closed without spring pressure
    • If a condition is found, replace the throttle body assembly.
    2. NOTE:

    Disconnecting the throttle body harness connector causes additional DTCs to set.

  2. Ignition OFF, disconnect the harness connector at the throttle body assembly.
  3. Ignition ON, verify that a test lamp does not continuously illuminate between each control circuit listed below and ground.
    • TAC Motor Control Closed circuit terminal A
    • TAC Motor Control Open circuit terminal B
    • If test lamp continuously illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Verify that a test lamp does not illuminate between each control circuit listed below and B+.
    • TAC Motor Control Closed circuit terminal A
    • TAC Motor Control Open circuit terminal B
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  5. Ignition OFF, set the DMM to the 40 V scale, select the Min/Max Recording Mode, and set the Peak Min/Max response time to 1 ms.
    6. NOTE:
    • The DMM Min/Max Recording Mode and the response time of 1 ms must be reset after testing each circuit or a lower voltage will be recorded.
    • The ignition must be OFF and the ECM completely powered down before testing each circuit or a lower voltage will be recorded.
  6. Ignition OFF, measure the voltage using the DMM Min/Max Recording Mode function on each circuit listed below as the ignition is turned ON. The Max voltage should be within 1 V of B+.
    • TAC Motor Control Closed circuit terminal A
    • TAC Motor Control Open circuit terminal B
    • If not within the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  7. If all circuits and connections test normal, replace the throttle body assembly.
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