Mitsubishi Outlander (2013+). Manual - part 466
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-39
• Incorrect adjustment of the stop lamp switch
• Master cylinder malfunction
• Brake booster malfunction
• ASC-ECU malfunction
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the CAN bus lines (Refer to GROUP
54C
− CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No. C121D set?
YES :
Go to Step 3.
NO :
This diagnosis is complete.
STEP 3. Brake pedal check
Refer to GROUP 35A
− On-vehicle Service/Brake
Pedal Check .
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Go to GROUP 35A
− On-vehicle
Service/Brake Pedal Check . Then go to
Step 7.
STEP 4. Check the installation condition of the
stop lamp switch.
Refer to GROUP 35A
− On-vehicle Service/Brake
Pedal Check .
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Install the stop lamp switch correctly, and
then go to Step 7.
STEP 5. Brake booster check
Refer to GROUP 35A
− On-vehicle Service/Brake
Booster Operation Check .
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
After replacing the brake booster, go to Step
7.
STEP 6. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C121D set?
YES :
Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to
). Then go to
Step 7.
NO :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
STEP 7. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C121D set?
YES :
Return to Step 1.
NO :
This diagnosis is complete.
Code No. C121E Brake fluid pressure sensor
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C
− CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to
and
OPERATION
The hydraulic sensor is incorporated in the hydraulic
unit. When the brake pedal is depressed, the pres-
sure sensor detects the brake pressure applied from
the master cylinder, converts this pressure into the
voltage signal, and outputs it.