Code No.B1770
Implausible coding data
caution |
- When diagnosis
code No. B1770 is set, be sure to diagnose the CAN bus line.
- When replacing the ECU, always check that the communication circuit is normal.
|
DIAGNOSIS FUNCTION
If incorrect vehicle information data is received, KOS-ECU sets the diagnosis code No.
B1770.
JUDGEMENT CRITERIA
If incorrect global coding data is received with the ignition switch turned ON when the
coding confirmation is completed, KOS-ECU determines that there is a problem.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Malfunction of KOS-ECU
- Malfunction of ETACS-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting
).
STEP 2. M.U.T.-III other system diagnosis code
Check if a coding-related diagnosis code is set in the ETACS-ECU.
Q.
Is the diagnosis code set?
Perform troubleshooting for ETACS-ECU (Refer to GROUP 54A - ETACS - Troubleshooting
).
Go to Step 3.
STEP 3. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
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(1)Turn the engine switch from the LOCK (OFF) position to the ON position.
|
|
(2)Check if the diagnosis code is set.
|
Q.
Is the diagnosis code set?
Check if the coding data is sent for the vehicles with immobilizer function on
"non-adaptable" condition. If so, change the immobilizer function into "adaptable", and then
go to Step 4.
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction
).
STEP 4. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
|
(1)Turn the engine switch from the LOCK (OFF) position to the ON position.
|
|
(2)Check if the diagnosis code is set.
|
Q.
Is the diagnosis code set?
Replace KOS-ECU and register the ID codes (Refer to
).
The procedure is complete.