Nissan Maxima Service and Repair Manual: DTC/circuit diagnosis

  • Power supply and ground circuit
  • Description EPS system functions by ignition power supply. Diagnosis Procedure 1.CHECK POWER SUPPLY Turn the ignition switch OFF. Disconnect power steering control unit connector. Turn the ignition switch ON. Check voltage between power steering control unit connectorM59 terminal 3 and ground. 2.CHECK GROUND CIRCUIT Turn the ignition switch OFF. Check continuity between power steering control unit connector M59 terminal 6 and ground. 3.CHECK TERMINALS AND HARNESS CONNECTORS Check power steering control unit pin terminals for damage or loose connection with harness connector.

  • Power steering solenoid valve
  • Description Power steering solenoid valve controls the power steering oil pressure in the gear housing assembly. Diagnosis Procedure 1.CHECK POWER STEERING SOLENOID VALVE SIGNAL Start engine. Check voltage between power steering control unit connectorM59 terminal 1 and ground 2.CHECK HARNESS BETWEEN POWER STEERING SOLENOID VALVE AND POWER STEERING CONTROL UNIT FOR OPEN Turn ignition switch OFF. Disconnect power steering solenoid valve connector. Disconnect power steering control unit connector. Check continuity between power steering solenoid valve connectorE14 (A) terminals 1, 2 and power steering control unitconnector M59 (B) terminal 1, 5. 3.

  • Engine speed signal circuit
  • Description ECM sends engine speed signal to power steering control unit. Diagnosis Procedure 1.PERFORM ECM SELF-DIAGNOSIS With CONSULT Perform ECM self-diagnosis. 2.CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT FOR OPEN Turn the ignition switch OFF. Disconnect ECM connector E10. Disconnect power steering control unit connector. Check continuity between ECM connector E10 (A) terminal 94and power steering control unit connector M59 (B) terminal 10. 3.CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT FOR SHORT Check continuity between ECM connector E10 terminal 94 andground. Turn ignition switch ON. Check voltage between ECM connector E10 terminal 94 andground. 4.

  • Vehicle speed signal circuit
  • Description Combination meter sends vehicle speed signal to power steering control unit. Diagnosis Procedure 1.PERFORM COMBINATION METER SELF-DIAGNOSIS Perform combination meter self-diagnosis. 2.CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT FOR OPEN Turn the ignition switch OFF. Disconnect combination meter connector. Disconnect power steering control unit connector. Check continuity between combination meter connector M24 (A) terminal 30 and power steering control unit connector M59 (B)terminal 8. 3.CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT FOR SHORT Check continuity between combination meter connector M24 terminal 30 and ground.

System description

Power supply and ground circuit