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DTC C1623: Brake Controlled System (Malfunction)


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION


AWC-ECU controls brakes for AYC control.

DTC SET CONDITIONS


The code is set when the AYC brake control operates for a prolonged period.

PROBABLE CAUSES



DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .) After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.

Q. Is DTC No. C1623 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. Scan tool diagnostic trouble code
Check other AWC diagnostic trouble code.(Refer to .)

Q. Is the DTC set?
Perform the relevant troubleshooting.
Go to Step 4.

STEP 4. Check whether the DTC is reset.

Q. Is DTC No. C1623 set?
Replace the AWC-ECU.(Refer to .) Then go to Step 5.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 5. Check whether the DTC is reset.

Q. Is DTC No. C1623 set?
Return to Step 1.
This diagnosis is complete.