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Code No. C1381 Longitudinal G stuck/low gain
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be stored. 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.
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to and ).
 
 
OPERATION
The G and yaw rate sensor output signal is sent to the ASC-ECU.
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITIONS
ASC-ECU monitors the G and yaw rate sensor output signal, and when an abnormality is present in the signal from the G and yaw rate sensor, the ECU determines that the trouble occurs and stores the diagnostic trouble code.
 
 
PROBABLE CAUSES
  • Malfunction of ASC-ECU
  • Improper installation of the hydraulic unit (integrated with ASC-ECU).
noteWhen the vehicle is driven under special conditions, such as driving on a rough road, this diagnostic trouble code will be stored.
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use the scan tool MB991958 to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting .) On completion, go to Step 2.
 
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
Is diagnostic trouble code No. C1381 stored?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Using scan tool MB991958, check data list
Check the following service data. (Refer to .)
  • Item No. 09: Longitudinal G-sensor
Is the check result normal?
Go to Step 4.
Go to Step 4.
 
STEP 4. Check whether the diagnostic trouble code is stored again.
(1) Erase the stored diagnostic trouble code.
(2) Ignition switch: "LOCK" (OFF) to "ON"
(3) Start the engine.
Is diagnostic trouble code No. C1381 stored?
Replace the hydraulic unit (integrated with ASC-ECU). (Refer to .)
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).