Active Skid Control System (ASC)

DTC C2203: VIN not recorded

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.
^ When another diagnostic trouble code for ASC-ECU is set, troubleshoot that diagnostic trouble code first.
^ Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
^ This diagnostic trouble code is set after ASC-ECU is swapped and the ignition switch is turned ON for the first time. However, on and after the second time, the diagnostic trouble code will not be set when ASC-ECU successfully receives the normal vehicle information from the engine control module.
^ When the hydraulic unit (integrated with ASC-ECU) is replaced, always perform the calibration of steering wheel sensor, G and yaw rate sensor, brake fluid pressure sensor, cut valve, and inlet valve.

CIRCUIT OPERATION
ASC-ECU receives vehicle information from the engine control module and stores it.

DTC SET CONDITIONS
This diagnostic trouble code is set when ASC-ECU cannot receive the vehicle information, after the ignition switch is turned ON, from the engine control module.

PROBABLE CAUSES
^ Malfunction of the CAN bus
^ Engine ECU malfunction
^ ASC-ECU malfunction
^ First ignition switch ON after replacement of ASC-ECU

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. Using scan tool MB991958, diagnose the CAN bus lines.
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. After repairing the CAN bus line, go to Step 2.

STEP 2. DTC recheck after repairing the CAN bus line
1) Ignition switch "LOCK" (OFF)
2) Ignition switch "ON"

Q: Is DTC C2203 set?
YES: Go to Step 3.
NO: The procedure is complete.

STEP 3. Scan tool diagnostic trouble code for other systems
Check if the engine control module sets a DTC.

Q: Is any DTC set?
YES: Troubleshoot the diagnostic trouble code of engine control module. Then go to Step 5.
NO: Go to Step 4.

STEP 4. Check whether the DTC is reset.
1) Ignition switch: "LOCK" (OFF) position
2) Ignition switch: "ON" position

Q: Is DTC C2203 set?
YES: Replace the hydraulic unit (incorporates in ASC-ECU). Then go to Step 5.
NO: Intermittent malfunction.

STEP 5. Check whether the DTC is reset.
1) Ignition switch: "LOCK" (OFF) position
2) Ignition switch: "ON" position

Q: Is DTC C2203 set?
YES: Return to Step 1.
NO: The procedure is complete.