Code No. C2114 Abnormality in G and yaw rate sensor operation voltage (Low voltage)
Code No. C2115 Abnormality in G and yaw rate sensor operation voltage (High voltage)












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 (Refer to GROUP 54C, Trouble code diagnosis ).
  • 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 (Refer to ).
  • 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 (Refer to , and ).

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.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if any malfunction below is found:
Code No. C2114
  • When the power supply voltage applied from ASC-ECU to the G and yaw rate sensor is not within the standard value range (low)
Code No. C2115
  • When the power supply voltage applied from ASC-ECU to the G and yaw rate sensor is not within the standard value range (high)

PROBABLE CAUSES

  • Damaged wiring harness and connectors
  • G and yaw rate sensor malfunction
  • ASC-ECU malfunction

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnosis table ). On completion, go to Step 2.

STEP 2. M.U.T.-III diagnosis code
Check that the diagnosis code No.U0125 is set in ASC-ECU.

Q. Is the diagnosis code No.U0125 set?
Troubleshoot for the diagnosis code (Refer to ). Then go to Step 3.
Go to Step 3.

STEP 3. Diagnosis code recheck

Q. Are the diagnosis codes No. C2114 or C2115 set?
Go to Step 4.
This diagnosis is complete.

STEP 4. M.U.T.-III data list
Check the following service data (Refer to ).

  • Item 08: Lateral G sensor
  • Item 09: G sensor <Vehicles for 4WD>
  • Item 12: Yaw rate sensor

Q. Is the check result normal?
Go to Step 12.
Go to Step 5.

STEP 5. G and yaw rate sensor installation check
Check that the G and yaw rate sensor is installed correctly.

Q. Is the check result normal?
Go to Step 6.
Reinstall the G and yaw rate sensor correctly (Refer to ), and then go to Step 13.

STEP 6. Connector check: A-58 ASC-ECU connector, C-137 G and yaw rate sensor connector

Q. Is the check result normal?
Go to Step 7.
Repair the defective connector.

STEP 7. Voltage measurement at C-137 G and yaw rate sensor connector
(1)Disconnect the C-137 G and yaw rate sensor connector.
(2)Turn the ignition switch to the ON position.
(3)Measure the voltage between the terminal No.1 and the body earth.
OK: Approximately battery voltage

Q. Is the check result normal?
Go to Step 10.
Go to Step 8.

STEP 8. Voltage measurement at A-58 ASC-ECU connector

(1)Disconnect the ASC-ECU connector, connect the ASC check harness (Special tool: MB991997) to the ASC-ECU-side connector and harness-side connector, and then measure at the special tool connector side.
(2)Disconnect the C-137 G and yaw rate sensor connector.
(3)Turn the ignition switch to the ON position.
(4)Measure the voltage between the terminal No.22 and the body earth.
OK: Approximately battery voltage

Q. Is the check result normal?

Repair the harness wire between A-58 ASC-ECU connector terminal No.22 to C-137 G and yaw rate sensor connector terminal No.1.

Go to Step 9.

STEP 9. Wiring harness check between A-58 ASC-ECU connector terminal No.22 and C-137 G and yaw rate sensor connector terminal No.1.

  • Check the power supply circuit for short circuit.

Q. Is the check result normal?
Go to Step 12.
Repair the wiring harness between A-58 ASC-ECU connector terminal No. 22 and C-137 G and yaw rate sensor connector terminal No. 1.

STEP 10. Wiring harness check between A-58 ASC-ECU connector terminal No.29 and C-137 G and yaw rate sensor connector terminal No.5.

  • Check the earth circuit for open circuit.

Q. Is the check result normal?
Replace the G and yaw rate sensor (Refer to ) and then go to Step 11.
Repair the wiring harness between A-58 ASC-ECU connector terminal No.29 and C-137 G and yaw rate sensor connector terminal No.5.

STEP 11. Check whether the diagnosis code is reset.

Q. Are the diagnosis codes No.C2114 or C2115 set?
Replace the ASC-ECU (Refer to ), and then go to Step 13.
This diagnosis is complete.

STEP 12. Check whether the diagnosis code is reset.

Q. Are the diagnosis codes No.C2114 or C2115 set?
Replace the hydraulic unit (ASC-ECU) (Refer to ), and then go to Step 13.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 13. Check whether the diagnosis code is reset.

Q. Are the diagnosis codes No.C2114 or C2115 set?
Return to Step 1.
This diagnosis is complete.