Code No. C1392
INCOMP.learn (Longitudinal G)
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- If there is any
problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table
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- 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 ).
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OPERATION
The G and yaw rate sensor output signal is sent to the ASC-ECU.
DIAGNOSIS CODE SET CONDITIONS
The ASC-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 stores the diagnosis code.
PROBABLE CAUSES
- The G and yaw rate sensor calibration not executed
- Malfunction of ASC-ECU
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use the 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 line. (Refer to GROUP 54C - Troubleshooting .)
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Q.
Is diagnosis code No. C1392 stored?
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Go to Step 3.
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This diagnosis is complete.
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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 stored again.
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(1)Erase the stored diagnosis code.
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(2)Ignition switch: "LOCK" (OFF) to "ON"
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Q.
Is diagnosis code No. C1392 stored?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then
go to Step 5.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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STEP 5. Check whether the diagnosis code is stored again.
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(1)Erase the stored diagnosis code.
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(2)Ignition switch: "LOCK" (OFF) to "ON"
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Q.
Is diagnosis code No. C1392 stored?
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Return to Step 3.
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This diagnosis is complete.
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