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Diagnostic Test

  1. ACTIVE DTC 
    1. Start the engine.
    2. Allow the engine to reach normal operating temperature.
    3. With a scan tool, View DTCs.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (K908) O2 2/2 RETURN CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the O2 Sensor 2/2 harness connector.
    3. Disconnect the PCM C1 harness connector.
    4. Measure the resistance between ground and the (K908) O2 2/2 Return circuit at the O2 Sensor harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  3

      No 

      • Repair the (K908) O2 2/2 Return circuit for a short to ground.
      • Perform the PCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  3. CHECK THE (K243) O2 SENSOR 2/2 SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the O2 Sensor 2/2 harness connector.
    3. Disconnect the PCM C1 harness connector.
    4. Measure the resistance between ground and the (K243) O2 Sensor 2/2 Signal circuit at the O2 Sensor harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (K243) O2 Sensor 2/2 Signal circuit for a short to ground.
      • Perform the PCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  4. CHECK FOR THE (K243) O2 SENSOR 2/2 SIGNAL CIRCUIT SHORTED TO THE (K908) O2 2/2 RETURN CIRCUIT 
    1. Measure the resistance between the (K243) O2 Sensor 2/2 Signal circuit and the (K908) O2 Return circuit in the O2 Sensor 2/2 harness connector.

      Is the resistance below 10K Ohms?

      Yes 

      • Repair the short between the (K908) O2 2/2 Return circuit and the (K243) O2 Sensor 2/2 Signal circuit.
      • Perform the PCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  5
  5. O2 SENSOR 
    1. Measure the voltage on the (K908) O2 2/2 Return circuit in the O2 Sensor harness connector.

      Is the voltage at 2.5 volts?

      Yes 

      No 

      • Go To  6
  6. POWERTRAIN CONTROL MODULE 
    NOTE:

    Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

    1. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

      Were there any problems found?

      Yes 

      No 

      • Replace and program the Powertrain Control Module in accordance with the service information. Refer to STANDARD PROCEDURE .
      • Perform the PCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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