Code No. C1394: INCOMP.learn neutral(SAS)
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- 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 - Troubleshooting
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit assembly (integrated with ASTC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G sensor (Refer to ).
- When the steering wheel sensor is replaced, always carry out calibration to make ASTC-ECU learn the neutral point (Refer to ).
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OPERATION
The steering wheel sensor output signal is sent to ASTC-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
ASTC-ECU receives the information of the steering wheel sensor calibration from the steering wheel sensor. When this information indicates that the calibration is not performed, the ECU sets the diagnosis code.
PROBABLE CAUSES
- The CAN bus line is defective.
- Steering wheel sensor calibration not implemented
- 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 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 - CAN Bus Trouble Symptom Chart ). 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. C1394 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Steering wheel sensor calibration
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Perform calibration of steering wheel 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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After the column switch assembly (Integrated with steering wheel sensor) is replaced (Refer to GROUP 54A - Column Switch ), calibrate the 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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Check again if the diagnosis code is set.
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(1)Erase the set diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. C1394 set?
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Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to ).
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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 set again.
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Check again if the diagnosis code is set.
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(1)Erase the set diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. C1394 set?
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Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to ).
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This diagnosis is complete.
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