2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Vehicle Speed Signal Check for Display Control Unit

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.
  1. CHECK HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect display control unit connector and combination unified meter and A/C amp. connector.
    3. Check continuity between display control unit harness connector M42 terminal 16 (V/W) and unified meter and A/C amp. harness connector M50 terminal 26 (V/W).
      1. Continuity should exist. 
    4. Check continuity between display control unit harness connector M42 terminal 16 (V/W) and ground.
      1. Continuity should not exist. 

    OK or NG

    1. OK : GO TO 2.
    2. NG : Repair harness.
    Fig 1: Checking Continuity Between Display Control Unit Harness Connector M42 Terminal 16 And Unified Meter And A/C Amp. Harness Connector M50 Terminal 26
    G03360096Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK1: VEHICLE SPEED SIGNAL 
    1. Connect display control unit connector and unified meter and a/c amp. connector.
    2. Turn ignition switch ON.
    3. Check voltage between display control unit harness connector M42 terminal 16 (V/W) and ground.
      1. Approx. 3.5V or more 

    OK or NG

    1. OK : GO TO 3.
    2. NG : Replace display control unit.
    Fig 2: Checking Voltage Between Display Control Unit Harness Connector M42 Terminal 16 And Ground
    G03360097Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK 2: VEHICLE SPEED SIGNAL 
    1. Drive vehicle at a constant speed.
    2. Check signal between display control unit harness connector M42 terminal 16 (V/W) and ground with CONSULT-II or oscilloscope.
      1. 16 (V/W) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT   ".  

    OK or NG

    1. OK : Replace display control unit.
    2. NG : Check unified meter and A/C amp. system. Refer to DIAGNOSIS FLOW .
    Fig 3: Checking Voltage Between Display Control Unit Harness Connector M42 Terminal 16 And Ground
    G03360098Courtesy of NISSAN MOTOR CO., U.S.A.
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