Code 51: Valve Relay Circuit
- Remove and test valve relay. See HYDRAULIC UNIT RELAYS under COMPONENT TESTING. Replace relay if faulty. If relay is okay, reinstall valve relay and go to next step.
- Turn ignition on. Disconnect hydraulic unit 2-pin connector. Measure voltage between terminal No. 52 and ground. See Fig 1. If battery voltage is not present, repair harness between fusible link (No. 7, Yellow) and hydraulic unit 2-pin connector. If battery voltage is present, go to next step.
- Turn ignition off. Using ohmmeter, check for continuity between hydraulic unit connector terminals No. 7 and 8. See Figure. If continuity is present, go to next step. If continuity is not present, replace hydraulic unit.
- Connect hydraulic unit connector. Disconnect ECU connector. Using ohmmeter, measure resistance between ECU connector terminals No. 2 and 27. Resistance should be 60-120 ohms. If resistance is okay, go to next step. If resistance is not within specification, repair wiring harness between hydraulic unit and ECU.
- Turn ignition on. Measure voltage between ECU connector terminal No. 22 and ground. If battery voltage is not present, repair or replace faulty wiring harness between hydraulic unit and ECU. If battery voltage is present, replace faulty ECU.
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA