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Code 52 - Motor Relay Circuit

  1. Check if hydraulic unit motor makes noise (still operating) when vehicle speed is above 4 MPH. If motor is not operating, go to next step. If motor is still operating, repair or replace wiring harness between hydraulic unit and ECU.
  2. Remove and test then hydraulic unit motor relay. Refer to HYDRAULIC UNIT RELAYS TEST  under COMPONENT TESTING. If relay is okay, go to next step. Replace relay if faulty.
  3. Check pump motor ground connection. If ground connection is okay, go to next step. Correct ground connection if bad. Ensure ground wire has a clean, tight connection.
  4. Install motor relay. Disconnect hydraulic unit 2-pin connector. Turn ignition on. Using a DVOM, measure voltage between both harness connector terminals No. 51 and 52 (Red/Black wires) and ground. If battery voltage is present in both circuits, go to next step. If battery voltage is not present in either circuit, repair harness between fusible link and hydraulic unit 2-pin connector.
  5. Connect hydraulic unit wiring harness. Disconnect ECU wiring harness connector. Using an ohmmeter, measure resistance between ECU harness connector terminals No. 2 (Blue/Yellow wire) and 26 (Green/Black wire). See Figure . Resistance should be 30-60 ohms. If resistance is not within specification, repair or replace wiring harness between hydraulic unit and ECU. If resistance is within specification, go to next step.
  6. Using an ohmmeter, measure resistance between ECU harness connector terminal No. 5 (Red/Yellow wire) and ground. Resistance should be .1-.3 ohm. If resistance is not within specification, repair or replace wiring harness between hydraulic unit and ECU. If resistance is within specification, replace faulty ECU.
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