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DTC B1157: EEPROM fail
DTC B1158: ECU internal error
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
  • When an EEPROM writing/reading error of KOS&OSS-ECU is detected, KOS&OSS-ECU sets DTC B1157, and flashes the indicator of engine switch in orange.
  • When an error is detected to the microcomputer in KOS&OSS-ECU sets DTC B1158, and flashes the indicator of engine switch in orange.
 
 
DTC SET CONDITION
Check Conditions
  • After KOS&OSS-ECU activation
Judgment Criterion
  • When the following conditions are met:
    1. EEPROM writing/reading error is detected.
    2. ECU internal circuit error is detected.
 
 
TROUBLESHOOTING HINT
  • Malfunction of KOS&OSS-ECU
 
 
DIAGNOSIS
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.
(4) Turn the power supply mode of the engine switch from "ON" to "OFF".
Is the DTC set?
Replace the KOS&OSS-ECU and register the VIN (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).