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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls - 2.0L - DTC P0351 To DTC P2138) >> Diagnostic Information & Procedures >> DTC P1516, P2101, P2119, or P2176 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  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 or a faulty ECM.
  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. With the ignition ON, and the throttle body connected, clear DTCs.
  5. With the ignition OFF, disconnect the throttle body and connect a DMM between the motor control 1 circuit and ground.
  6. Using the peak min max function measure the voltage on the motor control 1 circuit as the ignition is turned ON. Voltage should be within 1 volt of ignition voltage.
    • If voltage is not within 1 volt of ignition voltage, test for a faulty ECM.
  7. With the ignition ON, and the throttle body connected, clear DTCs.
  8. With the ignition OFF, disconnect the throttle body and connect a DMM between the motor control 2 circuit and ground.
  9. Using the peak min max function measure the voltage on the motor control 2 circuit as the ignition is turned on. Voltage should be within 1 volt of ignition voltage.
    • If voltage is not within 1 volt of ignition voltage, test for a faulty ECM.
    • If all circuits test normal, replace the throttle body.
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