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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls/Fuel - 1.8L - DTC Diagnostics, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> DTC P1516, P2101, P2119, or P2176 (LUW) >> 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. Inspect the Q38 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 opens or closes without spring pressure
    • If a condition is found, replace the Q38 Throttle Body.
    2. NOTE:

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

  2. Ignition OFF, disconnect the harness connector of the Q38 Throttle Body.
  3. Ignition ON, verify that a test lamp does not illuminate continuously between each motor control circuit listed below and ground:
    • Motor control closed circuit terminal A
    • Motor control open circuit terminal B
    • If the test lamp illuminates, test the control circuits for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  4. Ignition ON, verify that a test lamp does not illuminate between each control circuit listed below and B+:
    • Motor control closed circuit terminal A
    • Motor control open circuit terminal B
    • If the test lamp illuminates, test the appropriate control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
  5. Ignition OFF, set the DMM to 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 K20 Engine Control Module 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+.
    • Motor control closed circuit terminal A
    • 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 K20 Engine Control Module.
  7. If all circuits and connections test normal, replace the Q38 Throttle Body.
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