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.

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 ".
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
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Repair harness.
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
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Replace display unit.
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
  Courtesy 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 ".