Code No.B1A28
ENG ECU authentification error
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Whenever the ECU is replaced,
ensure that the input and output signal circuits are normal.
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ETACS-ECU sets diagnosis code No. B1A28 when the ETACS-ECU’s key certification
result and the engine-ECU’s starting condition do not match.
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COMMENT ON TROUBLE SYMPTOM
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ETACS-ECU determines that the abnormality is present, if the key certification result
OK but engine-ECU prohibits engine start by immobilizer function or key certification result
NG but engine permits engine starts.
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- Malfunction of CAN bus line
- Malfunction of ETACS-ECU
- Malfunction of Engine-ECU
- Chassis number registered in engine-ECU unmatched
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use 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 2.
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 Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting  ).
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STEP 2. M.U.T.-III other system diagnosis code
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Check whether an engine-ECU diagnosis code is set.
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Q.
Is the diagnosis code set?
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Perform troubleshooting for the engine (Refer to GROUP 13A - Troubleshooting <4G6>,
GROUP 13B - Troubleshooting <4D5> or
GROUP 13C - Troubleshooting <4N1>).
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Go to Step 3.
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STEP 3. Diagnosis code check
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Check if diagnosis code No. B1761 or B2206 is set in the ETACS-ECU.
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Q.
Is the diagnosis code set?
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Perform the troubleshooting of the diagnosis code that has been set.
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Go to Step 4.
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STEP 4. Check whether the diagnosis code is set again.
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Recheck if the diagnosis code is set.
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(1)Once key is removed from the ignition cylinder and then turn the ignition switch
from the LOCK (OFF) position to the ON position.
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace ETACS-ECU (Refer to ). Then go to
Step 5.
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The diagnosis is complete.
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STEP 5. Check whether the diagnosis code is set again.
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Recheck if the diagnosis code is set.
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(1)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the engine-ECU and register the chassis number and key codes [Refer
to GROUP 00 - How to Perform Chassis Number (Chassis No.) Writing ].
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The diagnosis is complete.
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