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

Regarding Wiring Diagram information, Electrical Diagrams.
1.PERFORM COMBINATION METER SELF-DIAGNOSIS
Perform combination meter self-diagnosis.
Is any error system detected?
YES - Check the error system.
NO - GO TO 2.
2.CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT FOR OPEN





1. Turn the ignition switch OFF.
2. Disconnect combination meter connector.
3. Disconnect power steering control unit connector.
4. Check continuity between combination meter connector M24 (A) terminal 30 and power steering control unit connector M59 (B) terminal 8.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair harness or connectors.
3.CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT FOR SHORT





1. Check continuity between combination meter connector M24 terminal 30 and ground.










2. Turn ignition switch ON.
3. Check voltage between combination meter connector M24 terminal 30 and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair harness or connectors.
4.CHECK VEHICLE SPEED SIGNAL (COMBINATION METER SIDE)
1. Turn the ignition switch OFF.
2. Connect combination meter connector.
3. Check combination meter input/output standard values. Combination Meter.
Is the inspection result normal?
YES - GO TO 5.
NO - Replace combination meter. Removal And Installation.
5.CHECK VEHICLE SPEED SIGNAL (POWER STEERING CONTROL UNIT SIDE)





1. Turn the ignition switch OFF.
2. Connect power steering control unit connector.
3. Start the engine.
4. Check signal between power steering control unit connector M59 terminal 8 and ground with oscilloscope.






Is the inspection result normal?
YES - GO TO 6.
NO - Replace power steering control unit. Service and Repair.
6.CHECK TERMINALS AND HARNESS CONNECTORS
1. Check power steering control unit pin terminals for damage or loose connection with harness connector.
2. 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.