Inspection Procedure 1

INSPECTION PROCEDURE 1: Communication with Scan Tool Is Not Possible. (Communication with All Systems Is Not Possible.)

Data Link Connector Circuit Part 1:

Data Link Connector Circuit Part 2:

CIRCUIT OPERATION
- A battery positive voltage is applied on the data link connector power terminal (terminal No.16). The ground terminals (terminal No.4 No.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. Measure the power supply voltage at data link connector C-1 21.







1. Measure voltage between terminal No.16 and ground.
- Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) present?

YES: Go to step 2.

NO: Check harness connectors C-211 C-216 at intermediate connector for damage and repair or replace as required. If intermediate connector C-211 C-216 are in good condition repair an open circuit between fusible link (1) and data link connector C-121 (terminal No.16). Then confirm that the malfunction symptom is eliminated.

STEP 2. Check the continuity at data link connector C-121.







1. Check for the continuity between terminal No.4 No.5 and ground.
- Should be less than 2 ohms.

Q: Does continuity exist?

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-121 (terminal No.4 No.5) and ground. Then confirm that the malfunction symptom is eliminated.