Vehicle Speed Signal Inspection
WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.
Symptom: ODO/trip meter indication is malfunction.
- CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL
- Connect CONSULT-III, and start engine.
- Compare the value in "SPEED METER" of "DATA MONITOR" in "METER A/C AMP" to that in speedometer in the combination meter during driving.
Is the value in speedometer almost same as that in the monitor?
Yes: Preform self-diagnosis of ABS actuator and electric unit (control unit). Refer to "CONSULT-III FUNCTIONS (ABS) ".
NO: GO TO 2.
- 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 and ground.
Courtesy of NISSAN MOTOR CO., U.S.A.
VOLTAGE SPECIFICATIONSTerminals Voltage (Approx.) (+) (-) Unified meter and A/C amp.connector Terminal M64 28 Ground NOTE: Maximum voltage may be 5 V due to specifications (connected units).
OK or NG
OK: GO TO 3.
NG-1 >> If monitor indicates "0 V" constantly, perform the following.
- Check each unit inputting vehicle speed signal (8 pulse). Malfunction is caused by short circuit between each unit and unified meter and A/C amp.
- Repair or replace malfunctioning parts.
NG-2 >> If monitor indicates "5 V" or "12 V" constantly, replace 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 (A) and unified meter and A/C amp. harness connector (B).CONTINUITY SPECIFICATIONS
A B Continuity Connector Terminal Connector Terminal M52 1 M64 28 Yes
OK or NG
OK: Replace combination meter.
NG: Repair harness or connector.