Code No. C1366:
Lateral G sensor (output error)
Code No. C1371: Yaw rate sensor error
Code
No. C1377: G and yaw rate sensor error
Code No. C1381: G sensor (output error, seizure)
Code
No. C1385: Yaw rate sensor active check
Code No. C1386: G sensor active check
Code
No. C1864: G and yaw rate sensor power circuit
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 - CAN Bus Diagnostics Table
).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit (integrated with ASTC-ECU) is replaced, always carry out
the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to
).
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OPERATION
The G and yaw rate sensor output signal is sent to the ASTC-ECU.
DIAGNOSIS CODE SET CONDITIONS
ASTC-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 sets the diagnosis code.
PROBABLE CAUSES
Current trouble
- Malfunction of the hydraulic unit assembly (integrated with ASTC-ECU)
Past trouble
- For diagnosis procedures, refer to How to treat past trouble (GROUP
00 - How to Use Troubleshooting/Inspection Service Points
).
note |
When the vehicle is driven under special conditions, such as driving on a rough road,
this diagnosis code will be set.
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnosis Table ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(6)Drive the vehicle at the speed exceeds 10 km/h.
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(7)Check if the diagnosis code is set.
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(8)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1366, C1371, C1377, C1381, C1385, C1386 or C1864 set?
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Go to Step 3.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunctions ).
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STEP 3. M.U.T.-III data list
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Check the following service data. (Refer to .)
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- Item No. 01: Longitudinal G sensor
- Item No. 02: Lateral G sensor
- Item No. 04: Yaw rate sensor
- Item No. 19: Longitudinal G sensor (Raw value)
- Item No. 20: Lateral G sensor (Raw value)
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Q.
Is the check result normal?
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Go to Step 4.
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Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to ).
Then go to Step 5.
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STEP 4. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(6)Drive the vehicle at the speed exceeds 10 km/h.
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(7)Check if the diagnosis code is set.
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(8)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1366, C1371, C1377, C1381, C1385, C1386 or C1864 set?
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Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to ).
Then go to Step 5.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunctions ).
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STEP 5. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(6)Drive the vehicle at the speed exceeds 10 km/h.
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(7)Check if the diagnosis code is set.
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(8)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1366, C1371, C1377, C1381, C1385, C1386 or C1864 set?
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Return to Step 1.
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The procedure is complete.
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