C1925

C1905, C1908, C1922, C1925, C1928 4WAS MAIN CONTROL UNIT

Description

- 4WAS rear actuator and the power steering solenoid valve is controlled by each sensor signal.
- The fail-safe functions stops the rear wheel angle function (the front wheel is the steering wheel cutting angle) when the electric components and the mechanical components are malfunctioning.
- The protective function stops 4WAS system temporarily when the input signal is not inputted to 4WAS main control unit (When battery-power dose not work temporarily).
- 4WAS front control unit and 4WAS main control unit perform two-way transmitting/receiving signals for optimal control of 4WAS system via 4WAS communication line.


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. RECHECK DTC

With CONSULT
1.Turn the ignition switch from OFF to ON.
2.Perform 4WAS main control unit self-diagnosis.
Is any DTC "C1905", "C1908", "C1922", "C1925" or "C1928" detected?
YES- Proceed to diagnosis procedure. .
NO- INSPECTION END


Diagnosis Procedure


1. PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

With CONSULT
Perform 4WAS main control unit self-diagnosis.
Is any DTC "C1905", "C1908", "C1922", "C1925" or "C1928" detected?
YES- Replace 4WAS main control unit. Exploded View.
NO- GO TO 2.

2. CHECK INFORMATION

With CONSULT
Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function. 4WAS Main Control Unit.
Is each data the standard value?
YES- Check each harness connector pin terminal for disconnection.
NO- Replace 4WAS main control unit. 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".