Code No. C1392:
G sensor (zero-point not calibrated)
Code No. C1393: Yaw rate sensor (zero-point not
calibrated)
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
The ASTC-ECU receives the information of the G and yaw rate sensor calibration from the
G and yaw rate sensor. When this information indicates that the calibration is not performed,
the ECU sets the diagnosis code.
PROBABLE CAUSES
- The G and yaw rate sensor calibration not executed
- Malfunction of the hydraulic unit assembly (integrated with ASTC-ECU)
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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)Check if the diagnosis code is set.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1392 or C1393 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. G and yaw rate sensor calibration
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Perform calibration of G and yaw rate sensor. (Refer to .)
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Q.
Is the check result normal?
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Go to Step 4.
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Calibrate the G and yaw rate sensor (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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(1)Turn the ignition switch to the "ON" position.
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(2)Check if the diagnosis code is set.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1392 or C1393 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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(1)Turn the ignition switch to the "ON" position.
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(2)Check if the diagnosis code is set.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1392 or C1393 set?
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Return to Step 1.
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The procedure is complete.
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