Inspection Procedure 1

INSPECTION PROCEDURE 1: No Communication Possible Between Scan Tool and All Systems.

Diagnosis Connector Circuit:

CIRCUIT OPERATION
^ The scan tool is energized by connecting the data link connector.

COMMENT
^ The data link connector power supply circuit, ground circuit, or scan tool may be faulty.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CONDITION:)
^ Malfunction of data link connector
^ Damaged harness and connector
^ Malfunction of the AWD-ECU

DIAGNOSIS

STEP 1. Measure the power supply voltage at data link connector C-14.








Measure the voltage between data link connector C-14 terminal 16 and ground.
^ The measured voltage should equal battery positive voltage.
Q: Is the measured voltage equal to battery positive voltage?
YES: Go to Step 4.
NO: Go to Step 2.

STEP 2. Check data link connector C-14, intermediate connector C-126, junction block connector C-212, C-214 for loose, corroded or damaged terminals, or terminals pushed back in the connector.











Q: Are the connectors and terminals in good condition?
YES: Go to Step 3.
NO: Repair or replace the damaged components.

STEP 3. Check the harness for open circuit or short circuit to ground between data link connector C-14 terminal 16 and fusible link 1.





Q: Is the harness wire in good condition?
YES: It can be assumed that this malfunction is intermittent.
NO: Repair or replace the harness wire.

STEP 4. Measure the ground circuit for resistance at the data link connector C-14.








Measure the resistance between terminal 4, 5 and ground.
^ The resistance should measure less than 2 ohms.
Q: Is the measured resistance less than 2 ohms?
YES: Replace the scan tool.
NO: Go to Step 5.

STEP 5. Check data link connector C-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connector and terminals in good condition?
YES: Go to Step 6.
NO: Repair or replace the harness wire.

STEP 6. Check the harness for open circuit between data link connector C-14 terminal 4, 5 and ground.





Q: Is the harness wire in good condition?
YES: It can be assumed that this malfunction is intermittent.
NO: Repair or replace the harness wire.