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Power Steering Control System (Except Crosscabriolet): Overview Nissan Murano Z51 рестайлинг

Steering Control Systems 7 illustrations ~879 words

OPERATION PRINCIPLE

During Parking (When Turning The Steering Wheel To The Right.)

Scheme 1

Scheme 1: OPERATION PRINCIPLE
Scheme 1: OPERATION PRINCIPLE
  1. Power steering solenoid valve is closed while a vehicle is stopped.
  2. Pinion "1R", "2R" and "3R" are closed depending on steering torque of steering wheel.
  3. Oil pressure "P" in the gear housing assembly is the sum of oil pressures occurred in "2R" and "3R". This results in a light steering force because of high pressure.

During High-speed Operation

Scheme 2

Scheme 2
Scheme 2
  1. Power steering solenoid valve is opened during high-speed operation.
  2. Pinion "1R", "2R" and "3R" are closed depending on steering torque of steering wheel.
  3. Oil pressure "2R" does not occur because the power steering solenoid valve is on full throttle.
  4. Oil pressure "P" in the gear housing assembly includes only oil pressure occurred in "3R" and results in a heavy steering force.

Scheme 3

Scheme 3: Component Parts Location
Scheme 3: Component Parts Location

Component Description

Component partsReference/Function
Power steering control unitSignals from various sensors control the driving voltage to the power steering solenoid valve. The power steering control unit controls the driving voltage to the power steering solenoid valve for maintaining the power steering assist force when the fail-safe function is activated. (The engine speed signals control EPS system if any vehicle speed signal error is detected.)
Combination meter" DESCRIPTION "
ECM" DESCRIPTION "
Power steering solenoid valve" DESCRIPTION "

COMPONENTS REFERENCE CHART

Description

Power supply to EPS system

Power steering solenoid valve controls the power steering oil pressure in the gear housing assembly.

ECM sends engine speed signal to power steering control unit.

Scheme 4

Scheme 4: Diagnosis Procedure
Scheme 4: Diagnosis Procedure

Scheme 5

Scheme 5
Scheme 5
  1. PERFORM ECM SELF-DIAGNOSIS With CONSULT-III Turn the ignition switch ON. CAUTION: Never start the engine Perform "ENGINE" self-diagnosis. Refer to " «CONSULT-III FUNCTION»(/nissan/murano/z51-2010-2012/remont/testing-diagnostics/#engine-control-system-vq35de-except-crosscabriolet) ". Is any DTC detected? YES: Check the DTC. NO: GO TO 2.
  2. CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT Turn the ignition switch OFF. Disconnect ECM harness connectors. Disconnect power steering control unit harness connector. Check continuity between ECM harness connector and power steering control unit harness connector. CONTINUITY REFERENCE CHART ECM Power steering control unit Continuity Connector Terminal Connector Terminal E16 94 M61 10 Existed Check continuity between power steering control unit harness connector and ground. CONTINUITY REFERENCE CHART Power steering control unit - Continuity Connector Terminal M61 10 Ground Not existed Is the inspection result normal? YES: GO TO 3. NO: Repair or replace damaged parts.
  3. CHECK ENGINE SPEED SIGNAL (1) Turn the ignition switch OFF. Connect ECM harness connectors. Check signal between ECM harness connector and ground with oscilloscope. SIGNAL REFERENCE CHART ECM Ground Condition Voltage (Approx.) Connector Terminal E16 94 Ground Engine is running Warm-up condition Idle speed Engine is running Warm-up condition Engine speed: Approx. 2,000 RPM Is the inspection result normal? YES: GO TO 4. NO: Replace ECM. Refer to " «ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : DESCRIPTION»(/nissan/murano/z51-2010-2012/remont/testing-diagnostics/#engine-control-system-vq35de-except-crosscabriolet) ".
  4. CHECK ENGINE SPEED SIGNAL (2) Turn the ignition switch OFF. Connect power steering control unit harness connector. Check signal between power steering control unit harness connector and ground with oscilloscope. SIGNAL REFERENCE CHART Power steering control unit - Condition Voltage (Approx.) Connector Terminal M61 10 Ground Engine is running Warm-up condition Idle speed Engine is running Warm-up condition Engine speed: Approx. 2,000 RPM Is the inspection result normal? YES: GO TO 5. NO: Replace power steering control unit. Refer to " «REMOVAL AND INSTALLATION»(ref-404393-S37684160732011061100000) ".
  5. 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.

Combination meter sends vehicle speed signal to power steering control unit.

Scheme 6

Scheme 6: Diagnosis Procedure
Scheme 6: Diagnosis Procedure
  1. PERFORM COMBINATION METER SELF-DIAGNOSIS With CONSULT-III Turn the ignition switch ON. CAUTION: Never start the engine Perform "METER/M&A" self-diagnosis. Refer to " «CONSULT-III FUNCTION (METER/M&A)»(ref-404380-S17596667512011061100000) ". Is any DTC detected? YES: Check the DTC. NO: GO TO 2.
  2. CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT Turn the ignition switch OFF. Disconnect combination meter harness connector. Disconnect power steering control unit harness connector. Check continuity between combination meter harness connector and power steering control unit harness connector. CONTINUITY REFERENCE CHART Combination meter Power steering control unit Continuity Connector Terminal Connector Terminal M34 30 M61 8 Existed Check continuity between power steering control unit harness connector and ground. CONTINUITY REFERENCE CHART Power steering control unit - Continuity Connector Terminal M61 8 Ground Not existed Is the inspection result normal? YES: GO TO 3. NO: Repair or replace damaged parts.
  3. CHECK VEHICLE SPEED SIGNAL (1) Turn the ignition switch OFF. Connect combination meter harness connector. Check combination meter input/output standard values. Refer to " «REFERENCE VALUE»(ref-404380-S07149348392011061100000) ". Is the inspection result normal? YES: GO TO 4. NO: Replace combination meter Refer to " «EXPLODED VIEW»(ref-404380-S22842214412011061100000) ".
  4. CHECK VEHICLE SPEED SIGNAL (2) Turn the ignition switch OFF. Connect power steering control unit harness connector. Check signal between power steering control unit harness connector and ground with oscilloscope. SIGNAL REFERENCE CHART Power steering control unit - Condition Voltage (Approx.) Connector Terminal M61 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 5. NO: Replace power steering control unit. Refer to " «REMOVAL AND INSTALLATION»(ref-404393-S37684160732011061100000) ".
  5. 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.

Scheme 7

Scheme 7: TERMINAL LAYOUT
Scheme 7: TERMINAL LAYOUT
  1. Hard steering when fully turning the steering wheel.
  2. Light steering when driving at a high speed.

See also:
• CONSULT-III FUNCTION

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