Vehicle Speed Signal Check

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect display unit connector M93 and combination meter connector M24.
3. Check continuity between display unit harness connector M93 terminal 7 (P/L) and combination meter harness connector M24 terminal 14 (P/L).
  
  Fig 1: Checking Harness Continuity Between connector M93 Terminal 7 (P/L) & Combination Meter Harness Connector M24 Terminal 14 (P/L)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Continuity should exist.
4. Check continuity between display unit harness connector M93 terminal 7 (P/L) and ground.
  Continuity should not exist.
OK or NG
1. OK: GO TO 2.
2. NG: Repair harness.
CHECK VEHICLE SPEED SIGNAL
1. Drive vehicle at a constant speed.
2. Check the signal between display unit harness connector M93 terminal 7 (P/L) and ground with CONSULT-II or oscilloscope.
  
  Fig 2: Checking Signal Between Display Unit Harness Connector M93 Terminal 7 (P/L) & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  7 (P/L) - Ground: Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY UNIT ".
OK or NG
1. OK: Replace display unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY UNIT ".
2. NG: Check combination meter system. Refer to "VEHICLE SPEED SIGNAL INSPECTION ".