Inspection Procedure 1

Data Link Connector Circuit:

Connectors: C-14, C-110:

CIRCUIT OPERATION
- A battery positive voltage is applied on the data link connector power terminal (terminal 16). The ground terminals (terminal 4, 5) are grounded to the vehicle body.

COMMENT
- The cause is probably a defect in power supply system (including ground) for the on-board diagnostic test mode line.

TROUBLESHOOTING HINTS
The most likely causes for this case:
- Malfunction of the data link connector.
- Damaged harness wire.

DIAGNOSIS




STEP 1. Check the power supply line at data link connector C-29.
1. Measure voltage between terminal 16 and ground.
- Voltage should be battery positive voltage.

If within specifications, go to Step 2.

If not within specifications, check the intermediate connectors C-89, C-110 and C-104, and repair or replace if needed. Refer to Harness Connector Inspection. If intermediate connectors C-89, C-110 and C-104 are in good condition, repair the harness wire between data link connector C-29 and fusible link (1).
Then confirm that the malfunction symptom is eliminated.




STEP 2. Check the ground line at the data link connector C-29.
1. Check for the continuity between terminal 4, 5 and ground.
- Should be less than 2 ohms.

If less than 2 ohms , replace the scan tool.

If open circuit, repair the harness wire between the data link connector C-29 and the ground.
Then confirm that the malfunction symptom is eliminated.