Code No. B1157 OSS EEPROM fail
Code No. B1158 OSS ECU internal fail

DIAGNOSTIC FUNCTION

• When an EEPROM writing/reading error of OSS-ECU is detected, OSS-ECU sets the diagnosis code No.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 diagnosis code No.B1158, and flashes the indicator of engine switch in orange.
  

JUDGEMENT CRITERIA

• After OSS-ECU activation
  

• When the following conditions are met:
  


1. EEPROM writing/reading error is detected.
   
2. ECU internal circuit error is detected.
   

PROBABLE CAUSES

• Malfunction of OSS-ECU
  

	Replace the OSS-ECU and register the chassis number (Refer to ).

	Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).