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.

CHECK VEHICLE SPEED OPERATION
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 audio unit connector, unified meter and A/C amp. connector, combination meter connector and display unit connector (without navigation system) or display control unit connector (with navigation system).
3. Check continuity between audio unit harness connector M46 terminal 22 (V/W) and unified meter and A/C amp. harness connector M50 terminal 26 (V/W).
  Continuity should exist.
4. Check continuity between audio unit harness connector M46 terminal 22 (V/W) and ground.
  Continuity should not exist.
  
  Fig 1: Checking Continuity Between Audio Unit Harness Connector Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG:
  - Check connector housings for disconnected or loose terminals.
  - Repair harness or connector.
CHECK 1: VEHICLE SPEED SIGNAL
1. Connect audio unit connector.
2. Turn the ignition switch ON.
3. Check voltage between audio unit harness connector M46 terminal 22 (V/W) and ground.
  Approx. 5V
  
  Fig 2: Checking Voltage Between Audio Unit Harness Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Replace audio unit.
CHECK 2: VEHICLE SPEED SIGNAL
1. Connect unified meter and A/C amp. connector, combination meter connector and display unit connector (without navigation system) or display control unit connector (with navigation system).
2. Start engine and drive vehicle at more than 40 km/h (25 MPH).
3. Check the signal between audio unit harness connector M46 terminal 22 (V/W) and ground with CONSULT-II or oscilloscope.
  
  Fig 3: Signal Check Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Checking Signal Between Audio Unit Harness Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: INSPECTION END.
2. NG: Replace unified meter and A/C amp.