[Previous][Next]
DTC C1242: Straight G Sensor Signal
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be stored. Prior to this diagnosis, diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
  • When hydraulic unit (integrated with G and yaw rate sensor) is replaced, calibrate G and yaw rate sensor (refer to GROUP 35C - On-vehicle Service )
 
 
OPERATION
AWC-ECU receives the G and yaw rate sensor data from ASC-ECU via the CAN communication.
 
 
DTC SET CONDITIONS
This DTC is stored when the abnormality below is detected:
  • Abnormality in G and yaw rate sensor output value
  • 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 G and yaw rate sensor
  • Malfunction of wheel speed sensor
  • Malfunction of stoplight switch
  • Malfunction of AWC-ECU

 
 
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics.
Use scan tool (M.U.T.-III) to perform the CAN bus diagnosis.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - Diagnosis, Can Bus Diagnostics Table ). After repairing the CAN bus line, go to Step 2.
 
STEP 2. Check whether the DTC is stored again.
Is DTC No.C1242 stored?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Scan tool (M.U.T.-III) other system DTC.
Check the ASC DTC (Refer to GROUP 35C - Diagnosis, Diagnostic Trouble Code Chart ).
Is the DTC stored?
Perform the relevant troubleshooting.
Go to Step 4.
 
STEP 4. Scan tool (M.U.T.-III) other system DTC.
Check if the wheel speed sensor-related DTC is stored.
Is the DTC stored?
Perform the relevant troubleshooting.
Go to Step 5.
 
STEP 5. Check of hydraulic unit (integrated with G and yaw rate sensor) installation status.
Check that the hydraulic unit (integrated with G and yaw rate sensor) is installed correctly (GROUP 35C - Hydraulic unit (integrated with G and yaw rate sensor) ).
Is the check result normal?
Go to Step 6.
Reinstall the hydraulic unit (integrated with G and yaw rate sensor) correctly. Then go to Step 6.
 
STEP 6. Scan tool (M.U.T.-III) data list.
Check the following data list (Refer to ).
  • Item No.24: Longitudinal G sensor
Is the check result normal?
Go to Step 7.
Replace the hydraulic unit (integrated with G and yaw rate sensor) (Refer to GROUP 35C - Hydraulic unit (integrated with G and yaw rate sensor) ). Then go to Step 8.
 
STEP 7. Check whether the DTC is stored again.
Is DTC No.C1242 stored?
Replace the AWC-ECU (Refer to ). Then go to Step 8.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
 
STEP 8. Check whether the DTC is stored again.
Is DTC No.C1242 stored?
Return to Step 1.
This diagnosis is complete.