Inspection Procedure 2

INSPECTION PROCEDURE 2: Communication with Scan Tool is Not Possible (Communication with ECM Only is Not Possible)

Data Link Connector Circuit Part 1:

Data Link Connector Circuit Part 2:

CIRCUIT OPERATION
- A diagnostic output is made from the ECM (terminal No.62) to the diagnostic output terminal (terminal No.7) of the data link connector.

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

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

DIAGNOSIS




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

Q: Is the connector in good condition?

YES: Go to Step 2.

NO: Repair or replace it. 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-14 (terminal No.7) and ECM connector C-117 (terminal No.62).

NOTE: Check harness after checking intermediate connectors C-101, C-105 and C-124. If intermediate connectors are damaged, repair or replace them. Then check that the malfunction is eliminated.

Q: Is the harness wire in good condition?

YES: Refer to, INSPECTION PROCEDURE 30 - Power Supply System and Ignition Switch - IG System.

NO: Repair it. Then confirm that the malfunction symptom is eliminated.