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DTC B1157 OSS EEPROM fail
DTC B1158 OSS ECU internal fail
 
 
 
 
DIAGNOSTIC FUNCTION
  • When an EEPROM writing/reading error of OSS-ECU is detected, OSS-ECU sets the DTC B1157, and flashes the indicator of engine switch in orange.
  • When an error is detected to the microcomputer in OSS-ECU, OSS-ECU sets the 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 HINTS
  • Malfunction of OSS-ECU
 
 
DIAGNOSIS
Check whether the DTC is reset.
Is the DTC set?
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 ).