C2204

DTC C2204 Internal abnormality in G and yaw rate sensor





CAUTION
^ If there is any problem in the CAN bus lines, an incorrect DTC 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.

OPERATION
ABS-ECU monitors if the output of G and yaw rate sensor is normal or not.

DTC SET CONDITIONS
This DTC is set if any malfunction below is found:
^ When abnormality is detected by the self-diagnosis of the lateral G and yaw rate
^ When the output value of the lateral G and yaw rate is not within the standard value range

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

PROBABLE CAUSES
^ Wiring harness or connector failure for the special CAN bus lines between ASC-ECU and the G and yaw rate sensor
^ 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 A

STEP 1. M.U.T.-III CAN bus diagnosis
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 2.

STEP 2. M.U.T.-III DTC
Check that the DTC U0125 is set in ASC-ECU.

Q: Is DTC U0125 set?
YES: Troubleshoot for the DTC. Then go to Step 3.
NO: Go to Step 3.

STEP 3. DTC 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, carry out calibration of the G and yaw rate sensor to make ASC-ECU relearn the neutral point, and then go to Step 5.
NO: Reinstall the G and yaw rate sensor correctly, and then go to Step 9.

STEP 5. M.U.T.-III data list
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 8.
NO: Go to Step 6.

STEP 6. Connector check: A-51 ASC-ECU connector, C-137 G and yaw rate sensor connector

Q: Is the check result normal?
YES: Go to Step 7.
NO: Repair the connector, and then go to Step 9.

STEP 7. Wiring harness check between A-51 ASC-ECU connector terminal No. 18 and C-137 G and yaw rate sensor connector terminal No. 2 as well as between A-51 ASC-ECU connector terminal No. 19 and C-137 G and yaw rate sensor connector terminal No. 3
^ Check the communication circuit for open and short circuit.

Q: Is the check result normal?
YES: Replace the G and yaw rate sensor, and then go to Step 8.
NO: Repair the wiring harness, and then go to Step 9.

STEP 8. Check whether the DTC is reset.

Q: Is DTC C2204 set?
YES: Replace the hydraulic unit (ASC-ECU), and then go to Step 9.
NO: Intermittent malfunction.

STEP 9. Check whether the DTC is reset.

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