Service Procedure

Diagnosis Procedure - DTC Stored

Use this procedure when the vehicle has come in with a DTC stored in Self-Diagnosis memory.

1. Use CONSULT-II to display "Self-Diagnosis Results."

2. Compare the DTC displayed by CONSULT-II to the following DTC charts:

^ Engine DTC Charts # 1 and # 2.

^ Transmission DTC Chart.

3. After identifying possible affected circuits, CONSULT-II can be used in Data Monitor mode as a preliminary check.

4. Check for intermittent open or short circuits by aggressively wiggling the EGI harness side to side and up and down at the specified harness bend (see Figure 1) while watching the results on CONSULT-II Data Monitor.

^ If the Data Monitor readings change significantly or a DTC sets when you wiggle the harness, then wire damage has been confirmed. Replace the harness (see the PARTS INFORMATION section for additional information).

^ If the readings do not change significantly, proceed to step 5, below.

5. Perform further diagnostics on the harness. Use the following references along with this bulletin:

^ Appropriate year Electronic Service Manual (ESM) Trouble Diagnosis for the DTC displayed

^ DTC Circuit charts.

6. Perform Continuity Checks A and B.

^ If the open or short is confirmed, replace the entire harness (see the PARTS INFORMATION section for additional information).

^ If you cannot confirm an open or short in the specified wire(s) as they pass through the indicated harness bend with the continuity checks, this bulletin does not apply.

Diagnosis Procedure - Non-DTC Symptom

Use this procedure if the vehicle symptom is listed on the Symptom Chart.

1. Verify that the symptom is listed in Symptom Chart.

2. Refer to the system wiring diagram in the appropriate year ESM together with the Symptom Chart to determine the pin location for the circuit in question.

3. Perform continuity checks A and B on the wire(s) for the malfunctioning circuit to isolate the short or open to the incident wire(s).

4. Check for intermittent open or short circuits by aggressively wiggling the EGI harness side to side and up and down at the specified harness bend (see Figure 1 ) and performing the indicated continuity check(s).

^ If ohmmeter values changes significantly when you shake the harness, then wire damage has been confirmed. Replace the harness (see the PARTS INFORMATION section for additional information).

^ If the value does not change significantly, then you cannot confirm an open or short in the specified wire(s) as they pass through the indicated harness bend with the continuity checks. This bulletin does not apply.





Continuity Check A (open circuit check) see Figure 2, shown

1. Record the radio presets for later reprogramming.

2. Turn Ignition Key Off and disconnect the vehicle's negative battery cable.

3. Disconnect the ECM and the engine component connectors.

4. Connect a jumper wire to the harness side of the appropriate pin of the ECM connector.

IMPORTANT:
Be very careful not to spread or otherwise damage the connector pin.

5. Route the jumper wire to the engine compartment.

6. Connect an ohmmeter between the jumper wire and the harness side of the appropriate pin of the component connector.

7. Aggressively wiggle the EGI harness side to side and up and down while you monitor the ohmmeter reading.

^ Resistance value should be close to zero ohms. If resistance value is high/over range, or fluctuates, an open circuit exists.

NOTE:
If resistance is high or over range, be sure it is not caused by poor ohmmeter probe or jumper wire connections.

Continuity Check B (short to ground check - shielded wires only)

1. After completing Continuity Check A, move the ohmmeter lead from the component connector to an engine ground.

2. Again aggressively wiggle the EGI harness side to side and up and down while you monitor the ohmmeter reading.

^ The resistance value should indicate an open circuit with "infinite" resistance (over range). If other than infinite resistance is indicated, the wire's outer shield is shorted to the inner "signal" wire and you must replace the harness (see the PARTS INFORMATION section for additional information).

NOTE:
If the resistance value indicates an open circuit, be sure it is not caused by poor ohmmeter probe or jumper wire connections.

3. Re-connect the vehicle's negative battery cable.

4. Re-set the vehicle radio presets.