C1921

C1921 ENGINE SPEED SIGNAL





Description
The engine speed signal is transmitted to 4WAS main control unit via CAN communication.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.RECHECK DTC
With CONSULT-III
1. Turn the ignition switch from OFF to ON.
2. Perform 4WAS main control unit self-diagnosis.
Is DTC "C1921" detected?
YES - Proceed to diagnosis procedure. Refer to C1921.
NO - INSPECTION END




Diagnosis Procedure
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.PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis.
Is DTC "U1000" or "U1010" detected?
YES - Check the error system.
NO - GO TO 3.
3.PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis.
Is DTC "C1921" detected?
YES - Replace 4WAS main control unit. Refer to Exploded View.
NO - GO TO 4.
4.INFORMATION CHECK
With CONSULT-III
Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function. Refer to 4WAS Main Control Unit.
Is each data the standard value?
YES - Check that there is no malfunction in each harness connector pin terminal or disconnection.
NO - Replace 4WAS main control unit. Refer to Exploded View.




Special Repair Requirement

BEFORE REPLACING 4WAS MAIN CONTROL UNIT
- Record the self-diagnosis results (history).

CAUTION:
- Never erase the memory (history) of self-diagnosis results when replacing 4WAS main control unit after diagnosis.
- Erase the memory of the self-diagnosis results (record) after printing out or recording all the values of "DATA MONITOR".