Vehicle Speed Signal Inspection

Symptom: Speedometer and ODO/trip meter indication is malfunction.

1. CHECK COMBINATION METER INPUT SIGNAL 
   1. Connect CONSULT-II, and start engine.
   2. Select "METER A/C AMP" on CONSULT-II.
   3. Using "SPEED METER" on "DATA MONITOR", compare the value of "DATA MONITOR" with speedometer pointer of combination meter.

   OK or NG 

   OK : Perform self-diagnosis of ABS actuator and electric unit (control unit). Refer to "CONSULT-II FUNCTIONS (VDC) ".

   NG : GO TO 2.

   Fig 1: Identifying Combination Meter Input Signal

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL 
   1. Drive vehicle at approximately 40 km/h (25 MPH).
   2. Check voltage signal between unified meter and A/C amp. harness connector M56 terminal 26 and ground.
      NOTE: Maximum voltage may be 5 V due to specifications (connected units).

      26 - Ground: 

      Fig 2: Identifying Unified Meter And A/C Amp

      Courtesy of NISSAN MOTOR CO., U.S.A.