Code No. B1A28
ENG ECU authentification error
caution |
- If diagnosis
code No. B1A28 is set, diagnose the CAN bus lines.
- When replacing the ECU, always check that the communication circuit is normal.
|
DIAGNOSTIC FUNCTION
When the KOS&OSS-ECU certification result is different from the engine status
after the completion of engine starting permission communication, KOS&OSS-ECU determines
that a problem has occurred, and sets diagnosis code No.B1A28. At the same time, KOS&OSS-ECU
displays the immobilizer certification system inspection warning to the combination meter.
JUDGEMENT CRITERIA
Check Conditions
- At engine starting certification
Judgement Criterion
- Certification result unmatch is received from engine-ECU.
PROBABLE CAUSES
- Writing error of chassis number to engine-ECU (engine-ECU
has been interchanged between two vehicles, or chassis number has not been written after engine-ECU
replacement)
- Malfunction of the CAN bus line
- Malfunction of KOS&OSS-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the 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 diagnosis code
Check if KOS&OSS-ECU diagnosis code No.B1161 is set.
Q.
Is the diagnosis code set?
Troubleshoot for the relevant diagnosis code (Refer to
).
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
|
(1)Check that the vehicle power can be turned "ON" and engine is started.
|
|
(2)Check the diagnosis code of engine-ECU.
|
Q.
Is the diagnosis code set?
Troubleshoot the engine-ECU (Refer to GROUP 13A -
Troubleshooting
<4G6>,
GROUP 13B -
Troubleshooting
<4D5>
or
GROUP 13C -
Troubleshooting
<4N1>).
Then go to Step 4.
Go to Step 4.
STEP 4. Check whether the diagnosis code is set again.
|
(1)Operate the engine switch several times within five seconds without depressing
the brake pedal <A/T>
or the clutch pedal <M/T>
to
turn on and off the power supply mode.
|
|
(2)Check again if the diagnosis code is set in the KOS&OSS-ECU.
|
Q.
Is the diagnosis code set?
Replace the KOS&OSS-ECU and register the chassis number (Refer to
). Then
go to Step 5.
Intermittent malfunction is suspected (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunction
).
STEP 5. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the KOS&OSS-ECU.
Q.
Is the diagnosis code set?
Replace the engine-ECU (Refer to GROUP 13A -
Engine-ECU
<4G6>, GROUP
13B -
Engine-ECU
<4D5>
or GROUP
13C -
Engine-ECU
<4N1>).
The diagnosis is complete.