Vehicle Speed Signal Inspection

COMBINATION METERS


Vehicle Speed Signal Inspection

Symptom: Odo/trip meter indication is malfunction.
1.CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL
1. Start the engine and select "METER/M&A" on CONSULT-III.
2. Compare the value in "SPEED METER" of "Data Monitor" in "METER/M&A" to that in speedometer in the combination meter during driving.
Is the value in speedometer almost same as that in the monitor?
YES - Perform self-diagnosis of ABS actuator and electric unit (control unit). Refer to Scan Tool Testing and Procedures.
NO - GO TO 2.
2.CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL
1. Start engine and drive vehicle at approximately 40 km/h (25 MPH).





2. Check voltage signal between unified meter and A/C amp. harness connector and ground.





OK or NG
OK - GO TO 3.
NG-1 - If monitor indicates "0 V" constantly, perform the following.
1. 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.
2. Repair or replace malfunctioning parts.
NG-2 - If monitor indicates "5 V" or "12 V" constantly, replace unified meter and A/C amp.
3.CHECK CONTINUITY BETWEEN COMBINATION METER AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect combination meter connector and unified meter and A/C amp. connector.





3. Check continuity between combination meter harness connector
(A) and unified meter and A/C amp. harness connector (B).





OK or NG
OK - Replace combination meter.
NG - Repair harness or connector.