[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
35 -SERVICE BRAKES > 35C-ACTIVE STABILITY CONTROL SYSTEM (ASC) > TROUBLESHOOTING<ASC-ECU><ASC-ECU> > DIAGNOSIS CODE PROCEDURES > CODE NO. C1242: ABNORMALITY IN G AND YAW RATE SENSOR (LONGITUDINAL G SENSOR)
Code No. C1242 Longitudinal G Sensor Signal
 
 
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.
 
 
OPERATION
ASC-ECU monitors if the output of G and yaw rate sensor is normal or not.
 
 
 
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality is detected by comparing the longitudinal G-sensor value output from the G and yaw rate sensor with the value output from the wheel speed sensor.
 
 
 
PROBABLE CAUSES
  • Malfunction of wheel speed sensor
  • ASC-ECU malfunction
  • External noise interference
noteWhen rotated on the four-wheel drum tester, this diagnosis code may be set.
 
 
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE CAN bus diagnosis
Use M.U.T.-IIISE to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
 
STEP 2. Diagnosis code recheck after resetting CAN bus lines
Is diagnosis code No.C1242 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Check the wheel speed sensor-related diagnosis code.
Use the M.U.T.-IIISE to check whether the wheel speed sensor-related diagnosis code is set or not.
Is the diagnosis code set?
Troubleshoot for the relevant diagnosis code (Refer to ).
Go to Step 4.
 
STEP 4. Check whether the ASC-ECU is installed properly.
Check whether the ASC-ECU is installed correctly. Refer to .
Is the check result normal?
Go to Step 5.
Repair it.
 
STEP 5. M.U.T.-IIISE data list
Check the following data list under curb weight condition or one occupant (driver) only in the vehicle, on a flat road (Refer to ).
  • Item 09: G sensor
  • Item 17: G sensor offset
Is the check result normal?
Turn the ignition switch to the "ON" from "OFF" position. Then go to Step 6.
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
 
STEP 6. Check whether the diagnosis code is set again.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
noteThe ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher.
Is diagnosis code No.C1242 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).