Steering Control System: Diagnosis Nissan Maxima A35

Diagnosis Procedure

Regarding Wiring Diagram information, refer to " WIRING DIAGRAM ".

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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 connector M59 terminal 3 and ground. VOLTAGE REFERENCE CHART Power steering control unit Ground Condition Voltage (Approx.) Connector Terminal M59 3 - Ignition switch ON Battery voltage Ignition switch OFF 0V Is the inspection result normal? YES >> GO TO 2. NO >> Repair harness or connectors.
2. CHECK GROUND CIRCUIT Turn the ignition switch OFF. Check continuity between power steering control unit connector M59 terminal 6 and ground. CONTINUITY REFERENCE CHART Power steering control unit Ground Continuity Connector Terminal M59 6 - Yes Is the inspection result normal? YES >> GO TO 3. NO >> Repair harness or connectors.
3. CHECK TERMINALS AND HARNESS CONNECTORS Check power steering control unit pin terminals for damage or loose connection with harness connector. Is the inspection result normal? YES >> Inspection End NO >> Repair or replace damaged parts.

Regarding Wiring Diagram information, refer to " WIRING DIAGRAM ".

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1. CHECK POWER STEERING SOLENOID VALVE SIGNAL Start engine. Check voltage between power steering control unit connector M59 terminal 1 and ground. VOLTAGE REFERENCE CHART Power steering control unit Ground Condition Voltage (Approx.) Connector Terminal M59 1 - Vehicle speed: 0 km/h (0 MPH) (Engine is running) 4.4 - 6.6 V Vehicle speed: 100 km/h (62 MPH) 2.5 - 3.7 V Is the inspection result normal? YES >> GO TO 2. NO >> GO TO 4 .
2. CHECK POWER STEERING SOLENOID VALVE HARNESS 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 connector E14 (A) terminals 1, 2 and power steering control unit connector M59 (B) terminal 1, 5. CONTINUITY REFERENCE CHART Power steering solenoid valve Power steering control unit Continuity Connector Terminal Connector Terminal E14 (A) 1 M59 (B) 1 Yes 2 5 Is the inspection result normal? YES >> GO TO 3. NO >> Repair harness or connectors.
3. CHECK POWER STEERING SOLENOID VALVE HARNESS FOR SHORT Check continuity between power steering solenoid valve connector E14 terminals 1, 2 and ground. CONTINUITY REFERENCE CHART Power steering solenoid valve Ground Continuity Connector Terminal E14 1 - No 2 Turn ignition switch ON. Check voltage between power steering solenoid valve connector E14 terminals 1, 2 and ground. VOLTAGE REFERENCE CHART Power steering solenoid valve Ground Voltage (Approx.) Connector Terminal E14 1 - 0V 2 Is the inspection result normal? YES >> GO TO 4. NO >> Repair harness or connectors.
4. CHECK POWER STEERING SOLENOID VALVE Perform power steering solenoid valve component inspection. Refer to " «COMPONENT INSPECTION»(ref-388075-S21242042202011022800000) ". Is the inspection result normal? YES >> GO TO 5. NO >> Replace power steering solenoid valve. Refer to " «EXPLODED VIEW»(ref-388052-S31086502942011022800000) ".
5. CHECK TERMINALS AND HARNESS CONNECTORS Check power steering control unit pin terminals for damage or loose connection with harness connector. Check power steering solenoid valve pin terminals for damage or loose connection with harness connector. Is the inspection result normal? YES >> Inspection End NO >> Repair or replace damaged parts.

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1. POWER STEERING SOLENOID VALVE RESISTANCE CHECK Turn ignition switch OFF. Disconnect power steering solenoid valve connector. Check resistance between power steering solenoid valve terminals 1 and 2 RESISTANCE REFERENCE CHART Power steering solenoid valve terminals Resistance (Approx.) 1 - 2 5 ohms Is the inspection result normal? YES >> GO TO 2. NO >> Replace power steering solenoid valve. Refer to " «EXPLODED VIEW»(ref-388052-S31086502942011022800000) ".
2. POWER STEERING SOLENOID VALVE OPERATION CHECK Check power steering solenoid valve by listening for its operation sound while applying battery voltage to power steering solenoid valve terminal 1 (positive) and battery ground to terminal 2 (negative). Is the inspection result normal? YES >> Inspection End NO >> Replace power steering solenoid valve. Refer to " «EXPLODED VIEW»(ref-388052-S31086502942011022800000) ".

Regarding Wiring Diagram information, refer to " WIRING DIAGRAM ".

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1. PERFORM ECM SELF-DIAGNOSIS With CONSULT-III Perform ECM self-diagnosis. Is any error system detected? YES >> Check the error system. NO >> GO TO 2.
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 94 and power steering control unit connector M59 (B) terminal 10. CONTINUITY REFERENCE CHART ECM Power steering control unit Continuity Connector Terminal Connector Terminal E10 (A) 94 M59 (B) 10 Yes Is the inspection result normal? YES >> GO TO 3. NO >> Repair harness or connectors.
3. CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT FOR SHORT Check continuity between ECM connector E10 terminal 94 and ground. CONTINUITY REFERENCE CHART ECM Ground Continuity Connector Terminal E10 94 - No Turn ignition switch ON. Check voltage between ECM connector E10 terminal 94 and ground. VOLTAGE REFERENCE CHART ECM Ground Voltage (Approx.) Connector Terminal E10 94 - 0V Is the inspection result normal? YES >> GO TO 4. NO >> Repair harness or connectors.
4. CHECK ENGINE SPEED SIGNAL (ECM SIDE) Turn the ignition switch OFF. Connect ECM connector E10. Start the engine. Check signal between ECM connector E10 terminal 94 and ground with oscilloscope. SIGNAL REFERENCE CHART ECM Value (Approx.) Connector Terminal Condition E10 94 - Ground Engine speed: At idle (Warm-up condition) Engine speed: Approx. 2,000 RPM (Warm-up condition) Is the inspection result normal? YES >> GO TO 5. NO >> Replace ECM.
5. CHECK ENGINE SPEED SIGNAL (POWER STEERING CONTROL UNIT SIDE) Turn the ignition switch OFF. Connect power steering control unit harness connector. Start the engine. Check signal between power steering control unit harness connector M59 terminal 10 and ground with oscilloscope. SIGNAL REFERENCE CHART Power steering control unit Value (Approx.) Connector Terminal Condition M59 10 - Ground Engine speed: At idle (Warm-up condition) Engine speed: Approx. 2,000 RPM (Warm-up condition) Is the inspection result normal? YES >> GO TO 6. NO >> Replace power steering control unit. Refer to " «REMOVAL AND INSTALLATION»(ref-388075-S27157672372011022800000) ".
6. CHECK TERMINALS AND HARNESS CONNECTORS Check power steering control unit pin terminals for damage or loose connection with harness connector. Check ECM pin terminals for damage or loose connection with harness connector. Is the inspection result normal? YES >> Inspection End. NO >> Repair or replace damaged parts.

Regarding Wiring Diagram information, refer to " WIRING DIAGRAM ".

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1. PERFORM COMBINATION METER SELF-DIAGNOSIS Perform combination meter self-diagnosis. Is any error system detected? YES >> Check the error system. NO >> GO TO 2.
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. CONTINUITY REFERENCE CHART Combination meter Power steering control unit Continuity Connector Terminal Connector Terminal M24 (A) 30 M59 (B) 8 Yes Is the inspection result normal? YES >> GO TO 3. NO >> Repair harness or connectors.
3. CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT FOR SHORT Check continuity between combination meter connector M24 terminal 30 and ground. CONTINUITY REFERENCE CHART Combination meter Ground Continuity Connector Terminal M24 30 - No Turn ignition switch ON. Check voltage between combination meter connector M24 terminal 30 and ground. VOLTAGE REFERENCE CHART Combination meter Ground Voltage (Approx.) Connector Terminal M24 30 - 0V Is the inspection result normal? YES >> GO TO 4. NO >> Repair harness or connectors.
4. CHECK VEHICLE SPEED SIGNAL (COMBINATION METER SIDE) Turn the ignition switch OFF. Connect combination meter connector. Check combination meter input/output standard values. Refer to " «REFERENCE VALUE»(ref-388063-S38726805772011022800000) ". Is the inspection result normal? YES >> GO TO 5. NO >> Replace combination meter. Refer to " «REMOVAL AND INSTALLATION»(ref-388063-S27023497762011022800000) ".
5. CHECK VEHICLE SPEED SIGNAL (POWER STEERING CONTROL UNIT SIDE) Turn the ignition switch OFF. Connect power steering control unit connector. Start the engine. Check signal between power steering control unit connector M59 terminal 8 and ground with oscilloscope. SIGNAL REFERENCE CHART Power steering control unit Value (Approx.) Connector Terminal Condition M59 8 - Ground Vehicle speed: 40 km/h (25 MPH) CAUTION: Check air pressure of tire under standard condition. Is the inspection result normal? YES >> GO TO 6. NO >> Replace power steering control unit. Refer to " «REMOVAL AND INSTALLATION»(ref-388075-S27157672372011022800000) ".
6. CHECK TERMINALS AND HARNESS CONNECTORS Check power steering control unit pin terminals for damage or loose connection with harness connector. Check combination meter pin terminals for damage or loose connection with harness connector. Is the inspection result normal? YES >> Inspection End NO >> Repair or replace damaged parts.

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1. CHECK SYSTEM FOR POWER SUPPLY AND GROUND Perform trouble diagnosis for power supply and ground circuit. Refer to " «DIAGNOSIS PROCEDURE»(ref-388075-S41155370742011022800000) ". Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace damaged parts.
2. CHECK SYSTEM FOR VEHICLE SPEED SIGNAL Perform trouble diagnosis for vehicle speed signal. Refer to " «DIAGNOSIS PROCEDURE»(ref-388075-S12859351632011022800000) ". Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace damaged parts.
3. CHECK SYSTEM FOR ENGINE SPEED SIGNAL Perform trouble diagnosis for engine speed signal. Refer to " «DIAGNOSIS PROCEDURE»(ref-388075-S32739492212011022800000) ". Is the inspection result normal? YES >> GO TO 4. NO >> Repair or replace damaged parts.
4. CHECK SYSTEM FOR POWER STEERING SOLENOID VALVE Perform trouble diagnosis for power steering solenoid valve. Refer to " «DIAGNOSIS PROCEDURE»(ref-388075-S24394834582011022800000) ". Is the inspection result normal? YES >> Perform the symptom diagnosis for the steering system. Refer to " «NVH TROUBLESHOOTING CHART»(ref-388052-S23605459762011022800000) ". NO >> Repair or replace damaged parts.