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DTC B1A28: PCM authentification error
 
 
caution
  • If DTC B1A28 is set, diagnose the CAN bus lines.
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
TECHNICAL DESCRIPTION (COMMENT)
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 DTC B1A28. At the same time, KOS&OSS-ECU displays the immobilizer certification system inspection warning to the combination meter.
 
 
DTC SET CONDITION
Check Conditions
  • At engine starting certification
Judgment Criterion
  • Certification result unmatch is received from engine control module.
 
 
TROUBLESHOOTING HINTS
  • Writing error of VIN to engine control module (engine control module has been interchanged between two vehicles, or VIN has not been written after engine control module replacement)
  • Malfunction of the CAN bus line
  • Malfunction of KOS&OSS-ECU
 
 
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 power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect scan tool (M.U.T.-III) "].
(2) Turn the power supply mode of the engine switch to "ON".
(3) Diagnose the CAN bus line.
(4) Turn the power supply mode of the engine switch to "OFF".
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Using scan tool (M.U.T.-III), read the diagnostic trouble code.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect scan tool (M.U.T.-III) "].
(2) Turn the power supply mode of the engine switch to "ON".
(3) Check if KOS&OSS-ECU DTC B1161 is set.
(4) Turn the power supply mode of the engine switch to "OFF".
Is the DTC set?
Refer to diagnostic trouble code chart .
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-III), read the other system diagnostic trouble code.
Check again if the DTC is set in the engine control module.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect scan tool (M.U.T.-III) "].
(2) Erase the DTC.
(3) Turn the power supply mode of the engine switch from "OFF" to "ON" and engine is started.
(4) Check if DTC is set.
Is the DTC set?
Perform troubleshooting for the engine control module (Refer to GROUP 13A, Troubleshooting ). On completion, go to Step 4.
Go to Step 4.
 
STEP 4. Recheck for diagnostic trouble code.
(1) Turn the engine switch "OFF" and "ON" several times without depressing the brake pedal (Perform quickly within approximately five seconds).
(2) Erase the DTC.
(3) Turn the power supply mode of the engine switch from "OFF" to "ON".
(4) Check if DTC is set.
Is the DTC set?
Replace the KOS&OSS-ECU and register the VIN (Refer to ). On completion, 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. Recheck for diagnostic trouble code.
(1) Erase the DTC.
(2) Turn the power supply mode of the engine switch from "OFF" to "ON".
(3) Check if DTC is set.
Is the DTC set?
Replace the engine control module.
The procedure is complete.