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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 145 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - DTC P0335 To DTC P3449) >> DTC P1516, P2101, P2119, or P2176 >> Circuit/System Testing

Circuit/System Testing

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  1. Inspect the throttle body for the following conditions:
    • A throttle blade that is NOT in the rest position
    • A throttle valve that is binding open or closed
    • A throttle valve that is free to move open or closed WITHOUT spring pressure
  2. Ignition ON, and the throttle body disconnected, measure for voltage on the motor control 1 and 2 circuits. Voltage should be 0 volts.
    • If voltage is more than 0 volts, test the affected motor control circuit for a short to voltage. If the circuit tests normal, replace the control module.
  3. Ignition ON, and the throttle body disconnected, probe the motor control 1 and 2 circuits with a test lamp connected to B+. Test lamp should not illuminate
    • If test lamp illuminates, test the affected motor control circuit for a short to ground.
  4. Turn OFF the ignition. Ensure that the ECM completely powers down.
  5. Connect a test lamp between TAC motor control 1 circuit and ground.
  6. The test lamp should illuminate as the ignition is turned ON.
    • If the test lamp does not illuminate, test the TAC motor control 1 circuit for an open or high resistance. If the circuit tests normal, replace the control module.
  7. Turn OFF the ignition. Ensure that the ECM completely powers down.
  8. Connect a test lamp between TAC motor control 2 circuit and ground.
  9. The test lamp should illuminate as the ignition is turned ON.
    • If the test lamp does not illuminate, test the TAC motor control 2 circuit for an open or high resistance. If the circuit tests normal, replace the control module.
  10. If all circuits test normal, replace the throttle body.
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