C2115
DTC C2114: Abnormality in G and yaw rate sensor operation voltage (Low voltage)DTC 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 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 special CAN bus lines.
DTC SET CONDITIONS
This diagnostic trouble code is set if any malfunction below is found:
DTC 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)
DTC 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
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 diagnostic trouble code No.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: Are DTCs C2114 and C2115 set?
YES: Go to Step 4.
NO: The procedure is complete.
STEP 4. 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 12.
NO: 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?
YES: Go to Step 6.
NO: Reinstall the G and yaw rate sensor correctly, and then go to Step 13.
STEP 6. Connector check: A-02 ASC-ECU connector, C-26 G and yaw rate sensor connector
Q: Is the check result normal?
YES: Go to Step 7.
NO: Repair the defective connector.
STEP 7. Voltage measurement at C-26 G and yaw rate sensor connector
1) Disconnect the connector, and measure at the wiring harness-side connector.
2) Turn the ignition switch to the ON position.
3) Measure the voltage between the terminal No.1 and the body ground.
OK: Approximately battery voltage
Q: Is the check result normal?
YES: Go to Step 10.
NO: Go to Step 8.
STEP 8. Voltage measurement at A-02 ASC-ECU connector
1) Disconnect the ASC-ECU connector, connect the ASC check harness (Special tool: MB991997) to the ASC-ECU-side connector and the wiring harness-side connector, and then measure at the special tool connector side.
2) Disconnect the C-26 G and yaw rate sensor connector.
3) Turn the ignition switch to the ON position.
4) Measure the voltage between the terminal No.6 and the body earth.
OK: Approximately battery voltage
Q: Is the check result normal?
YES: Repair the harness wire between A-02 ASC-ECU connector terminal No.6 to C-26 G and yaw rate sensor connector terminal No.1.
NO: Go to Step 9.
STEP 9. Wiring harness check between A-02 ASC-ECU connector terminal No.6 and C-26 G and yaw rate sensor connector terminal No.1.
^ Check the short circuit in power supply circuit.
Q: Is the check result normal?
YES: Go to Step 12.
NO: Repair the wiring harness between the A-02 ASC-ECU connector terminal No. 6 and the C-26 G and yaw rate sensor connector terminal No. 1.
STEP 10. Wiring harness check between A-02 ASC-ECU connector terminal No.31 and C-26 G and yaw rate sensor connector terminal No.5
^ Check the ground wires for short circuit.
Q: Is the check result normal?
YES: Replace the G and yaw rate sensor and then go to Step 11.
NO: Repair the wiring harness between the A-02 ASC-ECU connector terminal No. 31 and C-26 G and yaw rate sensor connector terminal No. 5.
STEP 11. Check whether the diagnostic trouble code is reset.
Q: Are DTCs C2114 or C2115 set?
YES: Replace the ASC-ECU, and then go to Step 13.
NO: This diagnosis is complete.
STEP 12. Check whether the diagnostic trouble code is reset.
Q: Are DTCs C2114 or C2115 set?
YES: Replace the ASC-ECU, and then go to Step 13.
NO: Intermittent malfunction.
STEP 13. Check whether the diagnostic trouble code is reset.
Q: Are DTCs C2114 or C2115 set?
YES: Return to Step 1.
NO: This diagnosis is complete.