Pump/Motor Circuits
NOTE:
For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagram, see wiring diagram.
- Turn ignition off. Disconnect relay box 10-pin connector. Inspect, clean and repair connector as necessary. Turn ignition on. Using scan tool, actuate pump/motor. Using test light connected to battery power, probe relay box 10-pin connector terminal No. 3 (Gray/Light Blue wire). If test light is not flashing, go to step 6). If test light is flashing, go to next step.
- Stop actuator test. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of relay box 10-pin connector terminal No. 6 (Brown/White wire). If resistance is less than 5 ohms, repair short to ground in Brown/White wire. If resistance is more than 5 ohms, go to next step.
- Using scan tool in voltmeter mode, check voltage on relay box 10-pin connector terminal No. 1 (Red/Dark Green wire). If reading is more than 10 volts, replace relay box. Perform TEST VER-1A. If reading is less than 10 volts, go to next step.
- Inspect ABS fuse located in Power Distribution Center (PDC). See Fig 1. If fuse is okay, repair open in Red/Dark Green wire. Perform TEST VER-1A. If fuse is blown, go to next step.
- Using scan tool in ohmmeter mode, check resistance of relay box 10-pin connector terminal No. 1 (Red/Dark Green wire). If resistance is less than 5 ohms, repair short to ground in Red/Dark Green wire. Replace ABS fuse. Perform TEST VER-1A. If resistance is more than 5 ohms, replace HCU. Replace ABS fuse. Perform TEST VER-1A.
- If test light is not flashing in step 1), turn ignition off. Reconnect relay box 10-pin connector. Disconnect CAB 60-pin connector. Inspect, clean and repair connector as necessary. Perform TEST VER-1A. If connector is okay, use an external ohmmeter to check resistance between chassis ground and CAB connector terminal No. 16 (Gray/Light Blue wire). If resistance is more than 70 ohms, repair open in Gray/Light Blue or Gray wire. Perform TEST VER-1A. If resistance is less than 70 ohms, go to TEST 20A.