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DTC B2204: Coding data mismatch


caution
  • When DTC B2204 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.

DTC SET CONDITION


If the vehicle information data transmitted from the ETACS-ECU via the CAN bus lines is different from that registered in the WCM, the WCM sets the DTC No. B2204.

TECHNICAL DESCRIPTION (COMMENT)


WCM determines that the abnormality is present when the vehicle information registered in it does not match the vehicle information data.

TROUBLESHOOTING HINTS



DIAGNOSIS
Required Special Tools:
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicle Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.

(1)
caution To prevent damage to scan tool (MB991958), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (MB991958).
Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the CAN bus line found to be normal?

Go to Step 2.

Repair the CAN bus line. (Refer to GROUP 54C, Diagnosis ).

STEP 2. Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code
Check if a coding-related DTC is set in the ETACS-ECU.

Q. Is the DTC set?
Troubleshoot the ETACS. (Refer to GROUP 54A, Diagnosis .)
Go to Step 3.

STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1)Erase the DTC.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?
Replace WCM and register the ID codes. (Refer to .)
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).