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DTC 51: Valve Relay Circuit

NOTE: If after all testing procedures have been completed system is not functioning properly, substitute ECU with known-good unit and retest.
  1. Remove and test Hydraulic Unit (HU) valve relay. See HYDRAULIC UNIT RELAYS  under COMPONENT TESTS. Replace relay if faulty. If relay is okay, reinstall valve relay and go to next step.
  2. Turn ignition switch on. Disconnect HU 2-pin connector. Using a DVOM, Check voltage between terminal No. 12 (Red/Black wire) and ground. If battery voltage is not present, repair harness between fusible link No. 8 and HU 2-pin connector. See WIRING DIAGRAMS  . If battery voltage is present, go to next step.
  3. Turn ignition switch off. Disconnect ECU connectors. Check resistance between ECU connector terminals No. 2 and 27. See Figure . Resistance should be 60-120 ohms. If resistance is as specified, go to next step. If resistance is not as specified, repair wiring harness between hydraulic unit and ECU as needed. See WIRING DIAGRAMS  .
  4. Check continuity between ECU connector terminal No. 22 and ground. If continuity does not exist, repair wiring harness between hydraulic unit and ECU. See WIRING DIAGRAMS  . If continuity exists, replace faulty ECU.
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