C1920
C1920 STEERING ANGLE SENDescription
^ Steering angle sensor signal is transmitted to 4WAS main control unit from 4WAS main control unit via CAN communication.
DTC Logic
DTC DETECTION LOGIC
C1920:
DTC CONFIRMATION PROCEDURE
1. RECHECK DTC
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform 4WAS main control unit self-diagnosis.
Is DTC "C1920" detected?
YES >> Proceed to diagnosis procedure. Refer to "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
1. PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS
With CONSULT-III
Perform ABS actuator and electric unit (control unit) 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 "C1920" detected?
YES >> Replace 4WAS main control unit.
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 "Reference Value". 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.
Special Repair Requirement
BEFORE REPLACING 4WAS MAIN CONTROL UNIT
^ Record the self-diagnosis results (history).
CAUTION:
^ Replace it without erasing 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" when erasing the memory of the self-diagnosis results (record).
AFTER REPLACING STEERING ANGLE SENSOR
1. PERFORM ACTIVE TEST (LOCK OPERATION)
With CONSULT-III
1. Stop vehicle with front wheels in the straight-ahead position.
2. Turn the ignition switch ON.
CAUTION: Never start engine.
3. Select "LOCK OPERATION" item on "ACTIVE" of 4WAS front control unit.
4. Perform "RELEASE" of "ACTIVE TEST".
CAUTION:
^ Turn steering wheel 90°, and then check that front tire does not move.
^ Never turn steering wheel 1 turn or more while performing "RELEASE".
5. Place steering wheel in neutral position.
6. Perform "LOCK" item on "ACTIVE TEST" of 4WAS front control unit.
7. Steer to 30° leftward slowly Steer to 30° rightward and return the steering wheel to the straight-ahead position.
8. Complete active test of 4WAS front control unit.
>> GO TO 2.
2. STEERING ANGLE SENSOR NEUTRA POSITION ADJUSTMENT
With CONSULT-III
1. Adjust steering angle sensor neutral position.
2. Turn the ignition switch OFF.
>> GO TO 3.
3. RETURN TO 4WAS FRONT ACTUATOR INITIAL POSITION
1. Start engine.
CAUTION: Check that condition with the vehicle stopped.
2. Turn steering wheel to the left by 90° slowly, and then turn to the right by 90°.
3. Again, turn steering wheel to the left by 90° slowly, and then turn to the right by 90° so that it faces straight ahead.
4. Stop vehicle with front wheels in the straight-ahead position after driving vehicle for a short time. (Engine starting)
>> GO TO 4.
4. CHECK 4WAS FRONT ACTUATOR
With CONSULT-III
1. Check "4WAS STR ANG" item on "DATA MONITOR" of 4WAS front control unit.
CAUTION: Never touch steering wheel while performing.
4WAS STR ANG: -3.5 - 3.5°
2. Turn the ignition switch OFF.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 1.
5. PERFORM ACTIVE TEST (SLOW MODE)
With CONSULT-III
1. Start engine.
CAUTION: Check that condition with the vehicle stopped.
2. Select "SLOW MODE" item on "ACTIVE TEST" of 4WAS front control unit.
3. Perform "MODE START" of "ACTIVE TEST".
4. Turn steering wheel to the left slowly until it stops.
5. Turn steering wheel to the right slowly until it stops.
Does "OK" display on both the left and right sides on "SLOW MODE" items of the monitor?
YES >> GO TO 6.
NO >> Refer to STC-30, "4WAS FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT: Special Repair Requirement (Pattern 4). Programming and Relearning
6. PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
Perform 4WAS front control unit self-diagnosis.
Is malfunction detected?
YES >> Check malfunctioning circuit.
NO >> GO TO 7.
7. ERASE ERROR RECORD
With CONSULT-III
Erase memories of self-diagnosis results for 4WAS front control unit and 4WAS main control unit.
>> END