Code No. C1396: Engine torque input refusal



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 - Troubleshooting ).
  • 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 ).

OPERATION


ASTC-ECU receives the engine system-related signal from the engine ECU via CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS


When the torque request rejection signal from the engine ECU indicates the rejection state, ASTC-ECU determines that the trouble occurs and sets this diagnosis code.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnosis


Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines


Q. Is diagnosis code No. C1396 set?

Go to Step 3.
This diagnosis is complete.

STEP 3. Use M.U.T.-III to confirm a diagnosis code of other systems.


Check that the engine-ECU sets a diagnosis code.

Q. Is the diagnosis code set?

Troubleshoot the engine-ECU diagnosis code (Refer to GROUP 13B - Diagnosis Code Chart <6B3> or GROUP 13C - Diagnosis Code Chart <4N1>).
Go to Step 4.

STEP 4. Engine-ECU coding data check


Use the M.U.T.-III to check whether the engine-ECU has stored the correct coding data.

Q. Is the diagnosis code other than code No. C1396 set?

Go to Step 5.
Replace the engine-ECU. (Refer to GROUP 13B - Engine-ECU <6B3> or GROUP 13C - Engine-ECU <4N1>.) Then go to Step 6.

STEP 5. M.U.T.-III data list


Check the following service data (Refer to ).

  • Item 13: Allow A.S.C. torque request

Q. Is the check result normal?

Go to Step 6.
Replace the engine-ECU. (Refer to GROUP 13B - Engine-ECU <6B3> or GROUP 13C - Engine-ECU <4N1>.) Then go to Step 6.

STEP 6. Check whether the diagnosis code is set again.


Check again if the diagnosis code is set.
(1)Erase the set diagnosis code.
(2)Ignition switch: "LOCK" (OFF)
(3)Ignition switch: "ON"

Q. Is diagnosis code No. C1396 set?

Replace the hydraulic unit assembly (integrated with ASTC-ECU). (Refer to .)
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).





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