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DTC B1A28: PCM authentification error
 
 
cautionWhenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TROUBLE JUDGMENT
ETACS-ECU stores DTC No. B1A28 when the ETACS-ECU's key certification result and the engine control module's starting condition do not match.
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
ETACS-ECU determines that the abnormality is present, if the key certification result OK but engine control module prohibits engine start by immobilizer function or key certification result NG but engine permits engine starts.
 
 
 
TROUBLESHOOTING HINTS
  • The CAN bus line may be defective.
  • The ETACS-ECU may be defective.
  • The engine control module may be defective.
  • Chassis number registered in engine control module unmatched.
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
 
STEP 2. Using scan tool (M.U.T.-III), read the engine control module diagnostic trouble code.
Check if DTC is stored in the engine control module.
Is the DTC stored?
Troubleshoot the MFI (Refer to GROUP 13A - DTC Chart .)
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-III), read the ETACS diagnostic trouble code.
Check if DTC No. B1761 or B2206 is stored in the ETACS-ECU.
Is the DTC stored?
Perform the troubleshooting of the DTC that has been set.
Go to Step 4.
 
STEP 4. Recheck for diagnostic trouble code.
Recheck if the DTC is stored.
(1) Once key is removed from the ignition cylinder and then turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(2) Check if the DTC is stored.
Is the DTC stored?
Replace ETACS-ECU. Then go to Step 5.
The diagnosis is complete.
 
STEP 5. Recheck for diagnostic trouble code.
Recheck if the DTC is stored.
(1) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(2) Check if the DTC is stored.
Is the DTC stored?
Replace the engine control module and register the chassis number and key codes [Refer to GROUP 00 - How to Perform Chassis Number (Chassis No.) Writing ].
The diagnosis is complete.