C1921

C1921 ENGINE SPEED SIGNAL





Description
The engine speed signal is transmitted to RAS control unit via CAN communication.




DTC Logic

DTC DETECTION LOGIC

DTC Detection Logic:

DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch from OFF to ON.
2. Perform RAS control unit self-diagnosis.
Without CONSULT-III
1. Start the engine.
2. Perform the self-diagnosis. Refer to Diagnosis Description.
Is DTC "C1921" or "RAS warning lamp flickering pattern: 33" 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
With CONSULT-III
Perform RAS control unit self-diagnosis.
Is DTC "U1000" or "U1010" detected?
YES - Check the error system.
NO - GO TO 3.
3.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Turn the ignition switch from OFF to ON.
2. Perform RAS control unit self-diagnosis.
Without CONSULT-III
1. Start the engine.
2. Perform the self-diagnosis. Refer to Diagnosis Description.
Is DTC "C1921" or "RAS warning lamp flickering pattern: 33" detected?
YES - Replace RAS 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 RAS 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 RAS control unit. Refer to Exploded View.




Special Repair Requirement

BEFORE REPLACING RAS CONTROL UNIT
- Record the self-diagnosis results (history).

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