Vehicle Speed Signal Inspection
WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.
Symptom: Indication is irregular for the speedometer and odo/trip meter.
- CHECK VDC/TCS/ABS CONTROL UNIT OR ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Perform the following self-diagnosis.
- VDC/TCS/ABS control unit [with VDC system]; refer to "CONSULT-II FUNCTIONS ".
- ABS actuator and electric unit (control unit) [without VDC system]; refer to "CONSULT-II FUNCTIONS " (with TCS) or "CONSULT-II FUNCTIONS " (without TCS).
Self-diagnostic results content
No malfunction detected : GO TO 2.
Malfunction detected : Check applicable parts, and repair or replace corresponding parts.
- CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL
- Start engine and drive vehicle at approximately 40 km/h (25 MPH)
- Check voltage signal between unified meter and A/C amp. harness connector M49 terminal 26 (W) and ground.NOTE: Maximum voltage may be 5 V due to specifications (connected units).
OK or NG
- OK : GO TO 3.
- NG:
- If monitor indicates "0 V" constantly, repair or replace malfunctioning parts after checking each unit inputting vehicle speed signal (8 pulse), harness and connector between each unit and unified meter and A/C amp.
- If monitor indicates "5 V" or "12 V" constantly, replace unified meter and A/C amp. Refer to "REMOVAL AND INSTALLATION OF UNIFIED METER AND A/C AMP. ".
- CHECK CONTINUITY BETWEEN COMBINATION METER AND UNIFIED METER AND A/C AMP.
- Turn ignition switch OFF.
- Disconnect combination meter connector and unified meter and A/C amp. connector.
- Check continuity between combination meter harness connector M19 terminal 20 (W) and unified meter and A/C amp. harness connector M49 terminal 26 (W).
- 20 (W) - 26 (W) : Continuity should exist.
OK or NG
- OK : Replace combination meter.
- NG : Repair harness or connector.