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Home >> Chevrolet >> 2010 >> Camaro LS, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 6.2L - DTC P1380 To DTC P3449) >> DTC P1516, P2101, P2119, or P2176 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    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, verify the following conditions do not exist with the Q38 throttle body assembly:
    • 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 Q38 throttle body assembly.
    2. NOTE: Disconnecting the throttle body harness connector may cause additional DTCs to set.
  2. Ignition OFF, disconnect the harness connector at the Q38 throttle body assembly.
  3. Ignition ON, verify that a test lamp does not illuminate between each motor control circuit listed below and ground.
    • Motor control circuit terminal A
    • Motor control circuit terminal B
    • If test lamp illuminates, test the motor control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Ignition ON, verify that a test lamp does not illuminate between each motor control circuit listed below and B+.
    • Motor control circuit terminal A
    • Motor control circuit terminal B
    • If the test lamp illuminates, test the motor control circuit for a short to ground. If the circuit tests normal, replace the K20 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.
    • The ignition must be OFF and the ECM completely powered down before testing each circuit.
  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+.
    • Motor control circuit terminal A
    • Motor control circuit terminal B
    • If not within the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  7. If all circuits and connections test normal, replace the Q38 throttle body assembly.
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