Code 6-0, Front Fail-Safe Relay Circuit
- Remove and test front fail-safe relay. See RELAY TEST . If relay is okay, use a DVOM to check for continuity between relay connector Black wire and ground. If continuity does not exist, repair open circuit between fail-safe relay and ground. Also check for poor ground connection.
- Disconnect 3-pin connectors at front solenoids. Check for continuity in Brown/Black wire between fail-safe relay and solenoid connectors. If continuity exists, go to next step. If continuity does not exist, repair open circuit in Brown/Black wire.
- Turn ignition on. Using a voltmeter, check for voltage at Yellow/Black wire in fail-safe relay connector. If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit in Yellow/Black wire between fail-safe relay and fuse No. 8.
- Turn ignition off. Using an ohmmeter, check resistance between Red and Black wires and between Yellow and Black wires in front solenoid connectors. If resistance is not 1-3 ohms, replace solenoid(s). If resistance is 1-3 ohms, disconnect 12-pin and 18-pin connectors at control unit. Check resistance between Red/Blue, Yellow/Blue, Red/Black and Yellow/Black wires and ground.
- If continuity exists in any wire, repair short to ground. If continuity does not exist, check Yellow/Green wire between front fail-safe relay and control unit. If continuity does not exist, repair open circuit in Yellow/Green wire. If continuity exists, substitute a known good control unit, and retest.