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DTC 52: Motor Relay

  1. Remove and test motor relay. See HYDRAULIC CONTROL UNIT (HCU) RELAYS  under COMPONENT TESTING. If relay is okay, go to next step. If relay is faulty, replace relay.
  2. Disconnect Hydraulic Control Unit (HCU) 10-pin connector. Using a voltmeter, check for voltage between ground and HCU wiring harness connector terminal No. 11. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, check Red/Black wire between fusible link No. 8 and HCU. Repair as necessary.
  3. Disconnect ABS-ECU connector. Using an ohmmeter, check resistance between ABS-ECU wiring harness terminals No. 2 and 26. See Figure . If resistance is 30-60 ohms, go to step 5). If resistance is not 30-60 ohms, go to next step.
  4. Inspect HCU connector. Clean or repair as necessary. Verify if DTC still exists. If DTC still exists, check wiring between HCU and ABS-ECU. See WIRING DIAGRAMS  . Repair as necessary.
  5. Using an ohmmeter, check resistance between ground and ABS-ECU wiring harness connector terminal No. 5. If resistance is 0.1-0.3 ohm, go to next step. If resistance is not 0.1-0.3 ohm, check wiring between HCU and ABS-ECU. See WIRING DIAGRAMS  . Repair as necessary. Check motor ground. Repair as necessary.
    CAUTION: DO NOT apply battery power for more than one second in following step or damage to motor may occur.
  6. Momentarily apply battery power to HCU connector terminal No. 2. If HCU motor can be heard operating, go to next step. If HCU motor cannot be heard operating, replace HCU.
  7. Inspect ABS-ECU connector. Clean or repair as necessary. Verify if DTC still exists. If DTC still exists, replace ABS-ECU.
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