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Diagnostic Procedure

  1. CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT
    1. Turn ignition switch "OFF".
    2. Disconnect EPS control unit harness connector.
    3. Turn ignition switch "ON". (Do not start engine.)
    4. Check voltage between EPS control unit harness connector (A) terminals and ground.
      VOLTAGE REFERENCE CHART

      Connector Terminal Voltage
      M37 3 - Ground Battery voltage
      E202 1 - Ground Battery voltage
      Fig 1: Checking Voltage Between EPS Control Unit Harness Connector (A) Terminals And Ground
      G04927444Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Turn ignition switch "OFF".
    6. Check voltage between EPS control unit harness connector (A) terminals and ground.
      VOLTAGE REFERENCE CHART

      Connector Terminal Voltage
      M37 3 - Ground Approx. 0 V
      E202 1 - Ground Battery voltage
      Fig 2: Checking Voltage Between EPS Control Unit Harness Connector (A) Terminals And Ground
      G04927445Courtesy of NISSAN MOTOR CO., U.S.A.
    7. Connect EPS control unit harness connector.

      OK or NG 

      OK: GO TO 2.

      NG: Check the following. If any items are damaged, repair or replace damaged parts.

      • 60 A fusible link (letter f, located in the fuse and fusible link box). Refer to POWER SUPPLY ROUTING CIRCUIT .
      • 10 A fuse [No. 12, located in the fuse block (J/B)]. Refer to POWER SUPPLY ROUTING CIRCUIT .
      • Harness for short or open between battery and EPS control unit harness connector E202 terminal 1.
      • Harness for short or open between ignition switch and EPS control unit harness connector M37 terminal 3.
  2. CHECK EPS CONTROL UNIT GROUND CIRCUIT
    1. Turn ignition switch "OFF".
    2. Disconnect EPS control unit harness connector.
    3. Check continuity between EPS control unit harness connector (A) terminal and ground.
      CONTINUITY REFERENCE CHART

      Connector Terminal Continuity
      E202 2 Yes

      Also check harness for short to power.

      Fig 3: Checking Continuity Between EPS Control Unit Harness Connector (A) Terminal And Ground
      G04927446Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Connect EPS control unit harness connector.

    OK or NG 

    OK: GO TO 3.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  3. CHECK DTC

    Start engine.

    Does EPS warning lamp turn OFF? 

    YES: INSPECTION END 

    NO: Perform self-diagnosis, repair or replace damaged parts. Refer to "CONSULT-III FUNCTION (EPS) ".

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