2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Vehicle Speed Signal Check

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.
  1. VEHICLE SPEED OPERATION CHECK 

    Does speedometer is operated normally?

    Yes or No

    1. YES: GO TO 2.
    2. NO: Check combination meter trouble diagnosis. Refer to "DIAGNOSIS FLOW ".
  2. CHECK HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect display unit connector, unified meter and A/C amp. connector, combination meter connector and audio unit 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).

      Continuity should exist 

    4. Check continuity between display unit harness connector M39 terminal 7 (V/W) and ground.

      Continuity should not exist. 

      Fig 1: Checking Continuity Between Display Unit Harness Connector And Ground
      G03492437Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 3.
    2. NG: Repair harness.
  3. CHECK 1: VEHICLE SPEED SIGNAL 
    1. Connect display unit connector.
    2. Turn ignition switch ON.
    3. Check voltage between display unit harness connector M39 terminal 7 (V/W) and ground.

      Approx. 5V 

      Fig 2: Checking Voltage Between Display Unit Harness Connector And Ground
      G03492438Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 4.
    2. NG: Replace display unit.
  4. CHECK 2: VEHICLE SPEED SIGNAL 
    1. Turn ignition switch OFF.
    2. Connect unified meter and A/C amp. connector, combination meter connector and audio unit connector.
    3. Drive vehicle at a constant speed.
    4. Check the signal between display unit harness connector M39 terminal 7 (V/W) and ground with CONSULT-II or oscilloscope.

      7 (V/W) - Ground: Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY UNIT   ". 

      Fig 3: Checking Signal Between Display Unit Harness Connector And Ground
      G03492439Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: Replace display unit.
    2. NG: Check unified meter and A/C amp. system, refer to "VEHICLE SPEED SIGNAL INSPECTION ".
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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.

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