C1622

DTC C1622: ACD Control System (Abnormal)

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 provides power supply to the ACD proportioning valve.

DTC SET CONDITIONS

This diagnostic trouble code is set if any condition below is found:

- When ACD clutch is protected.
- When the current value of the ACD proportioning valve solenoid exceeds the specified value for a prolonged period.

PROBABLE CAUSES

- The driving and road conditions are severe.
- Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics

Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?

YES Go to Step 3.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart).
After repairing the CAN bus line, go to Step 2.
STEP 2. Check whether the DTC is reset.

Q. Is DTC No. C1622 set?

YES Go to Step 3.
NO This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code

Check other ACD diagnostic trouble code. (Refer to Active Center Differential (ACD)).

Q. Is the DTC set?

YES Perform the relevant troubleshooting.
NO Go to Step 4.
STEP 4. Check whether the DTC is reset.

Q. Is DTC No. C1622 set?

YES Replace the AWC-ECU. (Refer to Twin Clutch-Sportronic Shift Transmission (TC-SST)). Then go to Step 5.
NO This diagnosis is complete. (The clutch protection activated in such driving or road condition as ACD control is applied for a prolonged period).
STEP 5. Check whether the DTC is reset.

Q. Is DTC No. C1622 set?

YES Return to Step 1.
NO This diagnosis is complete.