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.
2. Perform combination meter self-diagnosis. Refer to 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 the continuity between combination meter harness connector and power steering control unit harness connector.





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





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace error-detected parts.
3.CHECK VEHICLE SPEED SIGNAL (1)
1. Connect combination meter harness connector.
2. Check the combination meter input/output standard values. Refer to Combination Meter.
Is the inspection result normal?
YES - GO TO 4.
NO - Replace combination meter Refer to Regular Grade.
4.CHECK VEHICLE SPEED SIGNAL (2)
1. Turn the ignition switch OFF.
2. Connect power steering control unit harness connector.
3. Check the 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. Refer to Exploded View.
5.CHECK TERMINALS AND HARNESS CONNECTORS
- Check the power steering control unit pin terminals for damage or loose connection with harness connector.
- Check the combination meter pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES - INSPECTION END
NO - Repair or replace error-detected parts.