Active Skid Control System (ASC)

DTC C2204: Internal abnormality in G and yaw rate sensor

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.
^ Do not drop the G and yaw rate sensor or subject it to a shock.
^ When the G and yaw rate sensor is replaced, always perform the calibration to make ASC-ECU learn the neutral point.
^ 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 supplies power to the G and yaw rate sensor at the terminal No. 1.
^ The G and yaw rate sensor outputs the signal to ASC-ECU via the special CAN bus lines.

DTC SET CONDITIONS
This diagnostic trouble code is set if any malfunction below is found:
^ Abnormality is detected by the self-diagnosis of the G and yaw rate sensor.
^ Output value of the G and yaw rate sensor is not within the standard value range.

NOTE: This diagnostic trouble code may be set when G and yaw rate sensor is put on the turntable turning at high speed.

PROBABLE CAUSES
^ Improper installation of the G and yaw rate sensor
^ Damaged wiring harness and connectors
^ G and yaw rate sensor malfunction
^ ASC-ECU malfunction

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 2.
NO: Repair the CAN bus lines. After repairing the CAN bus line, go to Step 2.

STEP 2. Check for diagnostic trouble codes of other systems
Check if diagnostic trouble code No. U0125 is also set in ASC-ECU.

Q: Is DTC U0125 set?
YES: Perform troubleshooting for the diagnostic trouble code that is set. Then go to Step 3.
NO: Go to Step 3.

STEP 3. Check whether the DTC is reset.

Q: Is DTC C2204 set?
YES: Go to Step 4.
NO: The procedure is complete.

STEP 4. G and yaw rate sensor installation check
Check that the G and yaw rate sensor is installed correctly.

Q: Is the check result normal?
YES: After checking the G and yaw rate sensor, perform the calibration of the G and yaw rate sensor to make ASC-ECU relearn the neutral point. Then go to Step 5.
NO: Reinstall the G and yaw rate sensor correctly. Then go to Step 7.

STEP 5. Scan tool service data
Check the following service data.
^ Item 08: Lateral G sensor
^ Item 09: G sensor
^ Item 12: Yaw rate sensor

Q: Is the check result normal?
YES: Go to Step 6.
NO: Replace the G and yaw rate sensor. Then go to Step 6.

STEP 6. Check whether the DTC is reset.

Q: Is DTC C2204 set?
YES: Replace the hydraulic unit (incorporates in ASC-ECU). Then, go to Step 7.
NO: The procedure is complete.

STEP 7. Check whether the DTC is reset.

Q: Is DTC C2204 set?
YES: Return to Step 1.
NO: The procedure is complete.