C2204

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 ECU is replaced, ensure that the CAN bus lines are normal.
^ Do not drop or shock the G and yaw rate sensor.
^ When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point.
^ 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.

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 CAN bus lines.

DTC SET CONDITIONS
This diagnostic trouble code is set if any malfunction below is found:
^ When abnormality in lateral G sensor and yaw rate sensor is detected by the self-diagnosis of the G and yaw rate sensor
^ When the 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. 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 3.
NO: Repair the CAN bus lines. On completion, go to Step 2.

STEP 2. M.U.T.-III diagnostic trouble code
Check that the diagnostic trouble code U0125 is set in ASC-ECU.
Q: Is the DTC U0125 set?
YES: Troubleshoot for the diagnostic trouble code. Then go to Step 3.
NO: Go to Step 3.

STEP 3. Diagnostic trouble code recheck after resetting CAN bus lines
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, and then go to Step 7.

STEP 5. M.U.T.-III data list
Check the following service data.
^ Item 08: Lateral G-sensor
^ Item 09: G-sensor [AWD]
^ Item 12: Yaw rate sensor
Q: Is the check result normal?
YES: Go to Step 6.
NO: Replace the G and yaw rate sensor, and then go to Step 6.

STEP 6. Check whether the diagnostic trouble code is reset.
Q: Is DTC C2204 set?
YES: Replace the ASC-ECU, and then go to Step 7.
NO: Intermittent malfunction.

STEP 7. Check whether the diagnostic trouble code is reset.
Q: Is DTC C2204 set?
YES: Return to Step 1.
NO: This diagnosis is complete.