2003 Nissan-Datsun Sentra SE-R, StandardFACTORY OEM SERVICE PROCEDURE

Vehicle Speed Signal Check for Display Control Unit

WARNING: This page is about a different car, the 2004 Nissan Quest. 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 meter connector.
    3. Check continuity between display control unit harness connector M94 terminal 16 (P/L) and combination meter harness connector M24 terminal 14 (P/L).
      1. Continuity should exist. 
    4. Check continuity between display control unit harness connector M94 terminal 16 (P/L) 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 M94 Terminal 16 (P/L) And Ground
        G03501236Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK 1: VEHICLE SPEED SIGNAL 
    1. Connect display control unit connector and combination meter connector.
    2. Turn ignition switch ON.
    3. Check voltage between display control unit harness connector M94 terminal 16 (P/L) and ground.

    Approx. 3.5V or more 

    OK or NG

    1. OK: GO TO 3.
    2. NG: Replace display control unit. Refer to REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT .
      Fig 2: Checking Voltage Between Display Control Unit Harness Connector M94 Terminal 16 (P/L) And Ground
      G03501237Courtesy 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 M94 terminal 16 (P/L) and ground with CONSULT-II or oscilloscope.
    1. 16 (P/L) - Ground: Refer to TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT .

    OK or NG

    1. OK: Replace display control unit. Refer to REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT .
    2. NG: Check combination meter system. Refer to VEHICLE SPEED SIGNAL INSPECTION .
      Fig 3: Checking Signal Between Display Control Unit Harness Connector M94 Terminal 16 (P/L) And Ground
      G03501238Courtesy of NISSAN MOTOR CO., U.S.A.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.