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DTC No.C1242: Straight G Sensor Signal
 
 
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 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
AWD-ECU receives the G and yaw rate sensor data from ASC-ECU via the CAN communication.
 
 
DTC SET CONDITIONS
This DTC is set 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.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of G and yaw rate sensor
  • Malfunction of wheel speed sensor
  • Malfunction of stoplight switch
  • Malfunction of AWD-ECU

 
 
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). After repairing the CAN bus line, go to Step 2.
 
STEP 2. Check whether the DTC is set again.
Is DTC No.C1242 set?
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 - Troubleshooting ).
Is the DTC set?
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 set.
Is the DTC set?
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 set again.
Is DTC No.C1242 set?
Replace the AWD-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 set again.
Is DTC No.C1242 set?
Return to Step 1.
This diagnosis is complete.