Code No.C1707: Implausible Coding Data



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.
  • Whenever the ECU is replaced, ensure that the communication circuit is normal.
  • When the diagnosis code No.C1707 is set in 4WD-ECU, the diagnosis code may also be set in ETACS-ECU. When the diagnosis code is set in ETACS-ECU, perform the diagnosis of the diagnosis code for ETACS-ECU first.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in GROUP 54A, Immobilizer System - How to Register Key ID .)

OPERATION


4WD-ECU receives the vehicle information stored in ETACS-ECU via CAN bus lines.

DIAGNOSIS CODE SET CONDITION


This diagnosis code is set when the abnormality below is detected:


PROBABLE CAUSES




DIAGNOSIS PROCEDURE


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


Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?

Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).

STEP 2. M.U.T.-III other system diagnosis code.


Check the ETACS diagnosis code (Refer to GROUP 54A - Troubleshooting ).

Q. Is the diagnosis code set?

Perform the relevant troubleshooting.
Go to Step 3.

STEP 3. ETACS-ECU coding data check


Using the M.U.T.-III, check if there is the engine-related, T/M-related, ASC-related abnormality to the coding data stored in the ETACS-ECU (Refer to GROUP 00 - Coding Reference Table ).

Q. Is the check result normal?

Go to Step 4.
Repair the coding data or replace ETACS-ECU. Then go to Step 6.

STEP 4. Check the part number of ETACS-ECU


Check the part number of ETACS-ECU.

Q. Is the check result normal?

Go to Step 5.
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ), and then go to Step 6.

STEP 5. Check whether the diagnosis code is reset.


Q. Is diagnosis code No.C1707 set?

Replace the 4WD-ECU (Refer to ). Then go to Step 6 .
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 6. Check whether the diagnosis code is reset.


Q. Is diagnosis code No.C1707 set?

Return to Step 1.
This diagnosis is complete.