Diagnostic Procedure

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.

FRONT REVOLUTION SENSOR
Refer to "FRONT REVOLUTION SENSOR ", "COMPONENT INSPECTION".

OK or NG
1. OK: GO TO 3.
2. NG: GO TO 2.
CHECK CONTINUITY
Check the following.
- Continuity of transfer sub-harness
  Refer to "TRANSFER SUB-HARNESS ", "COMPONENT INSPECTION".
OK or NG
1. OK: Repair or replace front revolution sensor.
2. NG: Repair or replace front revolution sensor and transfer sub-harness.
CHECK INPUT SIGNAL
1. WITH CONSULT-II: GO TO 4.
2. WITHOUT CONSULT-II: GO TO 5.
CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine.
2. Select "ECU INPUT SIGNALS" in Data Monitor.
3. Read out the value of "VEHICLE SPEED SENSOR (FRONT)" while driving.
  
  Fig 1: Front Revolution Sensor Circuit Diagram
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: View Of Moving Vehicle
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: CONSULT-II Display
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check if the value changes according to accelerating and decelerating the vehicle.
OK or NG
1. OK: GO TO 6.
2. NG: GO TO 7.
CHECK INPUT SIGNAL
Without CONSULT-II
1. Start engine.
2. Check voltage between transfer control unit harness connector terminals 38 and 28.
  (Measure it in AC range.)
  
  Voltage:
  
  0 km/h (0 MPH): 0V
  
  30 km/h (19 MPH): More than 1V
  
  (Voltage rises gradually in response to vehicle speed.)
  
  Fig 4: View Of Moving Vehicle
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Checking Voltage Between Transfer Control Unit Harness Connector Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 6.
2. NG: GO TO 7.
PERFORM SELF-DIAGNOSIS AGAIN
After driving for a while, perform self-diagnosis again.

Refer to "TROUBLE DIAGNOSIS WITHOUT CONSULT-II ".

OK or NG
1. OK: INSPECTION END
2. NG:
  1. Perform transfer control unit input/output signal inspection. Refer to "TRANSFER CONTROL UNIT INSPECTION TABLE ", "TROUBLE DIAGNOSIS - GENERAL DESCRIPTION".
  2. If NG, recheck transfer control unit pin terminals for damage or loose connection with harness connector.
CHECK HARNESS CONTINUITY BETWEEN TRANSFER CONTROL UNIT AND FRONT REVOLUTION SENSOR SUB-HARNESS CONNECTOR
OK or NG
1. OK: GO TO 6.
2. NG: Repair or replace sub-harness connector between transfer control unit and front revolution sensor.