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DTC B1157: OSS EEPROM fail
DTC B1158: OSS ECU internal fail
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
  • When an EEPROM writing/reading error of OSS-ECU is detected, OSS-ECU stores DTC B1157.
  • When an error is detected to the microcomputer in OSS-ECU, OSS-ECU stores DTC B1158, and flashes the indicator of engine switch in orange.
 
 
DTC SET CONDITION
Check Conditions
  • After 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 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 stored.
(4) Turn the power supply mode of the engine switch from ON to OFF.
Is the DTC stored?
Replace the 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 ).