Engine Speed Signal Circuit

ENGINE SPEED SIGNAL CIRCUIT


Description

ECM sends engine speed signal to power steering control unit.




ENGINE SPEED SIGNAL CIRCUIT


Diagnosis Procedure

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





1. Turn the ignition switch OFF.
2. Disconnect ECM connector E10.
3. Disconnect power steering control unit connector.
4. Check continuity between ECM connector E10 (A) terminal 94 and power steering control unit connector M59 (B) terminal 10.





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





1. Check continuity between ECM connector E10 terminal 94 and ground.










2. Turn ignition switch ON.
3. Check voltage between ECM connector E10 terminal 94 and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair harness or connectors.
4.CHECK ENGINE SPEED SIGNAL (ECM SIDE)





1. Turn the ignition switch OFF.
2. Connect ECM connector E10.
3. Start the engine.
4. Check signal between ECM connector E10 terminal 94 and ground with oscilloscope.






Is the inspection result normal?
YES - GO TO 5.
NO - Replace ECM.
5.CHECK ENGINE SPEED SIGNAL (POWER STEERING CONTROL UNIT SIDE)





1. Turn the ignition switch OFF.
2. Connect power steering control unit harness connector.
3. Start the engine.
4. Check signal between power steering control unit harness connector M59 terminal 10 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 ECM pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES - Inspection End.
NO - Repair or replace damaged parts.