Vehicle Speed Signal Circuit

VEHICLE SPEED SIGNAL CIRCUIT


Description

Unified meter and A/C amp. sends vehicle speed signal to power steering control unit.




VEHICLE SPEED SIGNAL CIRCUIT


Diagnosis Procedure

1.PERFORM UNIFIED METER AND A/C AMP. SELF-DIAGNOSIS
With CONSULT-III
1. Turn the ignition switch ON.
2. Perform unified meter and A/C amp. self-diagnosis. Refer to Diagnosis System (Unified Meter and A/C AMP.)
Is any DTC detected?
YES - Check the DTC.
NO - GO TO 2.
2.CHECK HARNESS BETWEEN UNIFIED METER AND A/C AMP. AND POWER STEERING CONTROL
UNIT
1. Turn the ignition switch OFF.
2. Disconnect unified meter and A/C amp. harness connector.
3. Disconnect power steering control unit harness connector.
4. Check continuity between unified meter and A/C amp. 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. Connect unified meter and A/C amp. harness connector.
2. Check unified meter and A/C amp. input/output standard values. Refer to Unified Meter and A/C AMP..
Is the inspection result normal?
YES - GO TO 4.
NO - Replace unified meter and A/C amp. Refer to 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. Refer to Exploded View.
5.CHECK TERMINALS AND HARNESS CONNECTORS
- Check power steering control unit pin terminals for damage or loose connection with harness connector.
- Check unified meter and A/C amp. pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES - INSPECTION END
NO - Repair or replace damaged parts.