2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Vehicle Speed Signal Check

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 unit connector and unified meter and A/C amp. connector.
    3. Check continuity between display unit harness connector M39 terminal 7 (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 unit harness connector M39 terminal 7 (V/W) and ground.

    Continuity should not exist. 

    OK or NG

    1. OK : GO TO 2.
    2. NG : Repair harness.
    Fig 1: Checking Continuity Between Display Unit Harness Connector M39 Terminal 7 And Unified Meter And A/C Amp. Harness Connector M50 Terminal 26, And Between Display Unit Harness Connector M39 Terminal 7 And Ground
    G03359939Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK 1: VEHICLE SPEED SIGNAL 
    1. Connect display unit connector and unified meter and A/C amp. connector.
    2. Turn ignition switch ON.
    3. Check voltage between display unit harness connector M39 terminal 7 (V/W) and ground.
      1. Approx. 3.5V or more 

    OK or NG

    1. OK : GO TO 3.
    2. NG : Replace display unit.
    Fig 2: Checking Voltage Between Display Unit Harness Connector M39 Terminal 7 And Ground
    G03359940Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK 2: VEHICLE SPEED SIGNAL 
    1. Drive vehicle at a constant speed.
    2. Check the signal between display unit harness connector M39 terminal 7 (V/W) and ground with CONSULT-II or oscilloscope.
      1. 7 (V/W) - Ground :Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY UNIT   "  .

    OK or NG

    1. OK : Replace display unit.
    2. NG : Check unified meter and A/C amp. system, Refer to VEHICLE SPEED SIGNAL INSPECTION .
    Fig 3: Checking Voltage Between Display Unit Harness Connector Terminals
    G03359941Courtesy of NISSAN MOTOR CO., U.S.A.
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