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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 995 (Brake Control System (VDC/TCS/Abs)) >> Component Diagnosis >> C1145, C1146 Yaw Rate/Side G Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • Sudden turns (such as spin turns, acceleration turns), drifting, etc., when VDC function is off (VDC OFF switch "ON") may cause yaw rate/side/decel G sensor system to indicate a malfunction. However, this is not a malfunction if normal operation can be resumed after restarting engine. Then erase memory of self-diagnosis.
  • If vehicle is on turn-table at entrance to parking garage, or on other moving surfaces, VDC OFF indicator lamp may illuminate and CONSULT-III self-diagnosis may indicate yaw rate sensor system malfunction. However, in this case there is no malfunction in yaw rate sensor system. Take vehicle off of turn-table or other moving surfaces, and start engine. Results will return to normal. Also, after doing spin turns or acceleration turns with VDC function off (VDC OFF switch "ON"), the results will return to a normal condition by re-starting vehicle.
  1. CONNECTOR INSPECTION
    1. Turn ignition switch OFF.
    2. Disconnect yaw rate/side/decel G sensor connector and ABS actuator and electric unit (control unit) connector.
    3. Check terminals for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or replace terminals.
    4. Reconnect connectors and perform self-diagnosis. Refer to "CONSULT-III FUNCTION (ABS) ".

    Is any item displayed on the self-diagnosis display? 

    YES: GO TO 2

    NO: Poor connection of connector terminals. Repair or replace connectors.

  2. CHECK YAW RATE/SIDE/DECEL G SENSOR POWER SUPPLY CIRCUIT
    1. Turn ignition switch ON, then OFF.
    2. Check voltage between yaw rate/side/decel G sensor connector M55 terminal 4 and ground.
    TERMINAL VOLTAGE REFERENCE

    Yaw rate/side/decel G sensor Ground Condition Voltage (Approx.)
    Connector Terminal
    M55 4 - Ignition switch: ON Battery voltage
    Ignition switch: OFF 0 V
    Fig 1: Checking Voltage Between Yaw Rate/Side/Decel G Sensor Connector M55 Terminal 4 And Ground
    G04887278Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 3

    NO: Repair or replace malfunctioning components.

  3. CHECK YAW RATE/SIDE/DECEL G SENSOR GROUND SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Check resistance between yaw rate/side/decel G sensor connector M55 terminal 1 and ground.
    TERMINAL RESISTANCE REFERENCE

    Yaw rate/side/decel G sensor Ground Continuity
    Connector Terminal
    M55 1 - Yes
    Fig 2: Checking Resistance Between Yaw Rate/Side/Decel G Sensor Connector M55 Terminal 1 And Ground
    G04887279Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 4

    NO: Repair or replace malfunctioning components.

  4. CHECK YAW RATE/SIDE/DECEL G SENSOR HARNESS
    1. Check continuity between ABS actuator and electric unit (control unit) connector E26 (A) terminals 14 and 25 and yaw rate/side/decel G sensor harness connector M55 (B) terminals 2 and 3.
      TERMINAL CONTINUITY REFERENCE

      ABS actuator and electric unit (control unit) Yaw rate/side/decel G sensor Continuity
      Connector Terminal Connector Terminal
      E26 (A) 14 M55 (B) 2 Yes
      25 3
    2. Check continuity between ABS actuator and electric unit (control unit) connector E26 (A) terminals 14, 25 and ground.
    Fig 3: Checking Continuity Between ABS Actuator And Electric Unit Connector E26 (A) Terminals 14, 25 And Ground
    G04887280Courtesy of NISSAN MOTOR CO., U.S.A.
    TERMINAL CONTINUITY REFERENCE

    ABS actuator and electric unit (control unit) Ground Continuity
    Connector Terminal
    E26 (A) 14 - No
    25

    Is the inspection result normal? 

    YES: GO TO 5

    NO: Repair or replace malfunctioning components.

  5. CHECK DATA MONITOR
    1. Connect Yaw rate/side/decel G sensor and ABS actuator and electric unit (control unit) connectors.
    2. Select "YAW RATE SEN", "SIDE G-SENSOR" in "Data Monitor" and check Yaw rate/side/decel G sensor signal.
DATA MONITOR CHART

Vehicle condition Yaw rate sensor (Data monitor) Side G sensor (Data monitor)
Stopped Approx. 0 d/s Approx. 0 m/s2
Turning right Negative value Negative value
Turning left Positive value Positive value

Is the inspection result normal? 

YES: Replace ABS actuator and electric unit (control unit). Refer to "REMOVAL AND INSTALLATION ".

NO: Replace Yaw rate/side/decel G sensor. Refer to "REMOVAL AND INSTALLATION ".

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