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DTC B1131: Starter setting circuit fail
 
 
caution
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSTIC FUNCTION
When a short circuit of starter setting circuit system is detected, KOS&OSS-ECU sets DTC B1131. At the same time, KOS&OSS-ECU displays the power supply system error warning to the combination meter, and flashes the indicator of engine switch in orange.
 
 
DTC SET CONDITION
Check Conditions
  • After KOS&OSS-ECU activation
Judgment Criterion
  • Starter setting circuit system is detected
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness or connector (short to ground or short to power supply in ST line)
  • Malfunction of KOS&OSS-ECU
  • Malfunction of engine control module
 
 
DIAGNOSIS
STEP 1. Check of short or open circuit in ST line between KOS&OSS-ECU connector and engine control module connector.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
 
STEP 2. Voltage measurement at engine control module connector (ST terminal).
(1) Disconnect the engine control module connector, and measure at the wiring harness side.
(2) Using the scan tool (M.U.T.-III), set the forced power supply output to other than "IG-ST" (Refer to ).
(3) Measure the voltage between the engine control module connector (ST terminal) and body ground.
OK: 1 V or less
(4) Using the scan tool (M.U.T.-III), set the forced power supply output to "IG-ST" (Refer to ).
(5) Measure the voltage between the engine control module connector (ST terminal) and body ground.
OK: System voltage
Is the check result normal?
Go to Step 3.
  • Replace the KOS&OSS-ECU and register the VIN (Refer to ).
 
STEP 3. 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 engine control module and register the VIN and key codes (Refer to GROUP 00, How to Perform VIN Writing ).
Intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).