Inspection Procedure 1

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 voltage at data link connector C-69.
1. Measure voltage between terminal 16 and ground.
- Voltage should be battery positive voltage.

Q: Is the voltage normal?

YES: Go to step 2.

NO: Check harness connectors D-01 and D-06 at intermediate connector for damage, and repair or replace as required. Refer to Harness Connector Inspection. If intermediate connector D-01 and D-06 are in good condition, repair an open circuit between fusible link (6) and data link connector C-69 terminal 16.Then confirm that the malfunction symptom is eliminated.




STEP 2.Check the continuity at data link connector C-69.
1. Check for the continuity between terminal 4, 5 and ground.
- Should be less than 2 Ohms.

Q: Is the continuity normal?

YES: Replace the scan tool. Then confirm that the malfunction symptom is eliminated.

NO: Repair an open circuit or harness damage between data link connector C-69 terminal 4, 5 and ground. Then confirm that the malfunction symptom is eliminated.