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 CONFIRMATION PROCEDURE


1. PRECONDITIONING

If "DTC CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 2.

2. DTC REPRODUCTION PROCEDURE

With CONSULT
1.Turn the ignition switch from OFF to ON.
2.Perform "4WAS(MAIN)/RAS/HICAS" self-diagnosis.
Without CONSULT
1.Start the engine.
2.Perform the self-diagnosis. Diagnosis Description.
Is DTC "C1921" or "RAS warning lamp flickering pattern: 33" detected?
YES- Proceed to diagnosis procedure. .
NO- INSPECTION END


Diagnosis Procedure


1. PERFORM ECM SELF-DIAGNOSIS

With CONSULT
Perform "ENGINE" self-diagnosis.
Is any error system detected?
YES- Check the error system.
NO- GO TO 2.

2. PERFORM SELF-DIAGNOSIS

With CONSULT
Perform "4WAS(MAIN)/RAS/HICAS" self-diagnosis.
Is DTC "U1000" or "U1010" detected?
YES- Check the error system.
NO- GO TO 3.

3. PERFORM SELF-DIAGNOSIS

With CONSULT
1.Turn the ignition switch from OFF to ON.
2.Perform "4WAS(MAIN)/RAS/HICAS" self-diagnosis.
Without CONSULT
1.Start the engine.
2.Perform the self-diagnosis. Diagnosis Description.
Is DTC "C1921" or "RAS warning lamp flickering pattern: 33" detected?
YES- Replace RAS control unit. RAS Control Unit.
NO- GO TO 4.

4. INFORMATION CHECK

With CONSULT
1.Select "DATA MONITOR" of "4WAS(MAIN)/RAS/HICAS".
2.Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function. With Rear Active Steer.
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. RAS Control Unit.


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".