Code No.B2101 IG SW start POS circuit low
Code No.B2102 IG SW start POS circuit high


caution
  • If the diagnosis code No. B2101 or B2102 is set in KOS-ECU, always diagnose the CAN bus lines.
  • Before replacing the ECU, ensure that the communication circuit is normal.

TROUBLE JUDGEMENT



JUDGEMENT CRITERIA



B2101
  • Engine switch power supply mode: OFF
  • Engine switch information from ETACS-ECU: ON
B2102
  • Engine switch power supply mode: ON
  • Engine switch information from ETACS-ECU: OFF

PROBABLE CAUSES



  • Malfunction of CAN bus line
  • Malfunction of the KOS-ECU
  • Malfunction of the OSS-ECU
  • Damaged wiring harness and connectors
  • Malfunction of ETACS-ECU

DIAGNOSTIC PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics



Q. Is the check result normal?





STEP 2. M.U.T.-III other system diagnosis code



Q. Is the diagnosis code set?





STEP 3. M.U.T.-III other system data list




  • Item 254: IG voltage
OK: System voltage

Q. Is the check result normal?





STEP 4. Check whether the diagnosis code is reset.


(1)Erase the diagnosis code.
(2)Turn the power supply mode of the engine switch from OFF to ON.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?