Vehicle Speed Signal Circuit

VEHICLE SPEED SIGNAL CIRCUIT


Description

Combination meter sends vehicle speed signal to power steering control unit.





VEHICLE SPEED SIGNAL CIRCUIT


Diagnosis Procedure

1.PERFORM COMBINATION METER SELF-DIAGNOSIS
With CONSULT-III
1. Turn the ignition switch ON.

CAUTION:
Never start the engine
2. Perform "METER/M&A" self-diagnosis. CONSULT-III Function (Meter/M&A).
Is any DTC detected?
YES - Check the DTC.
NO - GO TO 2.
2.CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT
1. Turn the ignition switch OFF.
2. Disconnect combination meter harness connector.
3. Disconnect power steering control unit harness connector.
4. Check continuity between combination meter harness connector and power steering control unit harness connector.





5. Check continuity between power steering control unit harness connector and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace damaged parts.
3.CHECK VEHICLE SPEED SIGNAL (1)
1. Turn the ignition switch OFF.
2. Connect combination meter harness connector.
3. Check combination meter input/output standard values. Combination Meter.
Is the inspection result normal?
YES - GO TO 4.
NO - Replace combination meter Exploded View.
4.CHECK VEHICLE SPEED SIGNAL (2)
1. Turn the ignition switch OFF.
2. Connect power steering control unit harness connector.
3. Check signal between power steering control unit harness connector and ground with oscilloscope.





Is the inspection result normal?
YES - GO TO 5.
NO - Replace power steering control unit. Service and Repair.
5.CHECK TERMINALS AND HARNESS CONNECTORS
- Check power steering control unit pin terminals for damage or loose connection with harness connector.
- Check combination meter pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES - INSPECTION END
NO - Repair or replace damaged parts.