Inspection Procedure 2

Data Link Connector Circuit:

Connectors:

COMMUNICATION WITH ECM or PCM ONLY IS Not POSSIBLE

CIRCUIT OPERATION
- A diagnostic output is made from the ECM (terminal 62) or PCM (terminal 85) to the diagnostic output terminal (terminal 7) of the data link connector.

COMMENT
- No power supply to ECM or PCM .
- Defective ground circuit of ECM or PCM .
- Defective ECM or PCM .
- Improper communication line between ECM or PCM and scan tool.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Malfunction of ECM or PCM power supply circuit.
- Malfunction of the ECM or PCM .
- Open circuit between ECM or PCM and data link connector.

DIAGNOSIS

STEP 1. Check connector C-116 at ECM or connector C-117 at PCM for damage.

Q: Is the connector in good condition?

YES: Go to Step 2.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then confirm that the malfunction symptom is eliminated.

STEP 2. Check for open circuit, short circuit to ground and harness damage between data link connector C-26 terminal 7 and ECM connector C-116 terminal 62 or PCM connector C-117 terminal 85 .

NOTE: Check harness after checking Intermediate connectors C-25 and C- 140. If intermediate connectors are damaged, repair or replace them. Refer to Harness Connector Inspection. Then check that the malfunction is eliminated.

Q: Is the harness wire in good condition?

YES: Refer to INSPECTION PROCEDURE 29 Power Supply System and Ignition Switch IG System.
NO: Repair it. Then confirm that the malfunction symptom is eliminated.