Vehicle Speed Signal 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 ".

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.

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.

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 ".