C1907

C1900, C1901, C1906, C1907, C1927, C1933 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.RECHECK DTC

With CONSULT-III
1. Turn the ignition switch from OFF to ON.
2. Perform 4WAS main control unit self-diagnosis.
Is DTC "C1900", "C1901", "C1906", "C1907", "C1927" or "C1933" detected?
YES >> Proceed to diagnosis procedure. Refer to "Diagnosis Procedure".
NO >> INSPECTION END

Diagnosis Procedure

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

With CONSULT-III
Perform 4WAS main control unit self-diagnosis.
Is any DTC "C1900", "C1901", "C1906", "C1907", "C1927" or "C1933" detected?
YES >> Replace 4WAS main control unit.
NO >> GO TO 2.

2.CHECK INFORMATION

With CONSULT-III
Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function. Refer to STC-155, "Reference Value". 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.

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".