Vehicle Speed Signal Inspection

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. 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 "TROUBLE DIAGNOSIS ".
CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect display unit connector and unified meter and A/C amp. connector.
3. Check continuity between display unit harness connector M62 terminal 7 (R/G) and unified meter and A/C amp. harness connector M56 terminal 26 (R/G).
  1. Continuity should exist.
4. Check continuity between display unit harness connector M62 terminal 7 (R/G) and ground.
  1. Continuity should not exist.
Fig 1: Checking Continuity Between Display Unit Harness Connector M62 Terminal 7 (R/G) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : GO TO 3.
2. NG : Repair harness or connector.
CHECK VEHICLE SPEED SIGNAL
1. Connect unified meter and A/C amp. connector.
2. Drive vehicle at a constant speed.
3. Check the signal between display unit harness connector M62 terminal 7 (R/G) and ground with CONSULT-II or oscilloscope.
Fig 2: Oscilloscope Graph Pattern
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Connecting Unified Meter And A/C Amp. Connector
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 ".