Inspection Procedure 1

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












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.