C2206

DTC C2206: Re-execution of variant coding

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.
^ If the diagnostic trouble code C2206 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnostic trouble code may be set. In this case, the set diagnostic trouble code is not highly reliable.
^ Before replacing the ECU, ensure that the communication circuit is normal.
^ When the diagnostic trouble code C2206 is set in ASC-ECU, the diagnostic trouble code may also be set in ETACS-ECU. When the diagnostic trouble code is set in ETACS-ECU, carry out the diagnosis of the diagnostic trouble code for ETACS-ECU first.
^ 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.

OPERATION
ASC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.

DTC SET CONDITIONS
ASC-ECU communicates with ETACS-ECU via CAN bus lines. This diagnostic trouble code is set if the vehicle information stored in ETACS-ECU varies from the one stored when the ignition switch was last turned on.

PROBABLE CAUSES
^ ETACS-ECU or ASC-ECU which was equipped with other vehicle is used.
^ Malfunction of ETACS-ECU
^ ASC-ECU malfunction
^ External noise interference

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

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. On completion, go to Step 6.

STEP 2. M.U.T.-III diagnostic trouble code
Check that the diagnostic trouble code U1415 or U1417 is set in ASC-ECU.
Q: Is any DTC set?
YES: Troubleshoot for the relevant diagnostic trouble code.
NO: Go to Step 3.

STEP 3. M.U.T.-III Diagnostic trouble code of other systems
Use scan tool to check that the ETACS-ECU-related diagnostic trouble code is set.
Q: Is any DTC set?
YES: Troubleshoot the relevant diagnostic trouble code, and then go to Step 4.
NO: Go to Step 4.

STEP 4. Check whether the diagnostic trouble code is reset.
Q: Is DTC C2206 set?
YES: Replace the ASC-ECU, and then go to Step 5.
NO: The procedure is complete.

STEP 5. Check whether the diagnostic trouble code is reset.
Q: Is DTC C2206 set?
YES: Replace ETACS-ECU, and then go to Step 6.
NO: The procedure is complete.

STEP 6. Check whether the diagnostic trouble code is reset.
Q: Is DTC C2206 set?
YES: Return to Step 1.
NO: The procedure is complete.