Vehicle Speed Signal Inspection

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

CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL
1. Start engine and drive vehicle at approximately 40 km/h (25 MPH).
2. Check voltage signal between combination meter harness connector M25 terminal 14 (V/W) and ground with simple oscilloscope of CONSULT-II.
  
  Fig 1: Checking Voltage Signal With Oscilloscope
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Voltage Signal Between Combination Meter And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : Replace the combination meter.
2. NG : GO TO 2.
CHECK CONTINUITY BETWEEN COMBINATION METER AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect combination meter connector and unified meter and A/C amp. connector.
3. Check continuity between combination meter harness connector M25 terminal 14 (V/W) and unified meter and A/C amp. harness connector M50 terminal 26 (V/W).
  Continuity should exist.
4. Check continuity between combination meter harness connector M25 terminal 14 (V/W) and ground.
  
  Fig 3: Checking Continuity Between Combination Meter And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Continuity should not exist.
OK or NG
1. OK : GO TO 3.
2. NG : Repair harness or connector.
CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS
Perform the ABS actuator and electric unit (control unit) self-diagnosis. Refer to CONSULT-II FUNCTIONS (with VDC system) or CONSULT- II FUNCTIONS (without VDC system).

OK or NG
1. OK : Replace the unified meter and A/C amp. Refer to REMOVAL AND INSTALLATION OF UNIFIED METER AND A/C AMP .
2. NG : Check the applicable parts.