8. Vehicle Vibrates Excessively When ABS Is Operating

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

While ABS is operating, brake pedal vibrates slightly. This is not a problem.
If vehicle vibration is greater in the AUTO mode than in the 2WD mode, there is the possibility of failure in the communication line between the ABS control unit and transfer control unit. Check and locate the cause of the problem.

INSPECTION START
Inspection for excessive vibration of vehicle

Fig 1: Identifying Communication Line Between ABS Control Unit And Transfer Control Unit
Courtesy of NISSAN MOTOR CO., U.S.A.
1. GO TO 2.
CARRY OUT SELF-DIAGNOSIS
Perform self-diagnosis for the ABS actuator and electric unit and transfer control unit.

Are there any malfunctions?
1. Yes: GO TO 3.
2. NO: GO TO 4 .
INSPECTION OR REPAIR
Inspect or repair the system according to the self-diagnostic item.
1. OK: GO TO 4.
CHECK CIRCUIT
1. Disconnect connectors from ABS actuator and electric unit and transfer control unit. Check terminals for damage or loose connection.
2. Check continuity between ABS actuator and electric unit connector terminal 9 and transfer control unit connector terminal 32.
  
  Fig 2: Checking Continuity Between ABS Actuator And Electric Unit Connector And Transfer Control Unit Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
Does continuity exist?
1. Yes: GO TO 5.
2. NO: Check the following.
  - Harness connectors E111, M143
  - Harness for open or short between ABS actuator and electric unit and transfer control unit
    If NG, repair harness or connectors.
CHECK ABS OPERATING SIGNAL CIRCUIT
1. Reconnect only ABS actuator and electric unit connector.
2. Check continuity between transfer control unit connector terminal 32 and ground.
  Continuity should not exist.
  
  Fig 3: Checking ABS Operating Signal Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
Does continuity exist?
1. Yes: Replace ABS actuator and electric unit.
2. NO: GO TO 6.
CHECK ABS OPERATING SIGNAL
1. Connect CONSULT-II to Data Link Connector.
2. Turn ignition switch "ON". Set CONSULT-II in the active test mode to output an ABS operating signal. (Refer to ACTIVE TEST PROCEDURE , "CONSULT-II Inspection Procedure".)
3. An ABS operating signal lasts for 10 seconds. During the time the signal is being output, check resistance between transfer control unit connector terminal 32 and ground.
  Resistance: 0.5ohm, max.
  
  Fig 4: Checking ABS Operating Signal
  Courtesy of NISSAN MOTOR CO., U.S.A.
Is resistance within specifications?
1. Yes: CHECK transfer control unit. Refer to ABS OPERATION SIGNAL (WITHOUT VDC) .
2. NO: Replace ABS actuator and electric unit.

CAUTION: Be careful not to damage sensor edge and sensor rotor teeth. When removing the front or rear wheel hub assembly, disconnect the ABS wheel sensor from the assembly and move it away.