DTC B2275: STSW Monitor Malfunction: Procedure

1. Delete the DTC. Refer to DTC CHECK / CLEAR .

   HINT: 

   After all DTCs are cleared, turn the engine switch on (IG) and depress the brake pedal. After 15 seconds have elapsed, check if the trouble occurs again.

2. Check for DTCs again.

   OK

   No DTC is output.

NG → See step   2 

OK → END 

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Inspecting D44 Power Source Control ECU Connector Terminal

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   Voltage

   Terminal No. (Symbol)	Condition	Specified condition
   D44-39 (STSW) - Body ground	Brake pedal depressed, Engine switch START	10 to 14 V

   HINT: 

   Voltage is output for 0.3 seconds after engine start.

NG → REPLACE POWER SOURCE CONTROL ECU 

OK: Go to next step 

1. Disconnect the D44 ECU connector.
   Fig 2: View Of Disconnected D44 ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A55 ECM connector.
   Fig 3: Identifying A55 ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Resistance

   Terminal No. (Symbol)	Specified Condition
   D44-39 (STSW) - A55-14 (STSW)	Below 1 Ω
   D44-39 (STSW) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. After replacing the power source control ECU with a normally functioning ECU, check that the engine can start.

   OK

   Engine can start normally.

NG → GO TO  SFI SYSTEM 

OK → END (POWER SOURCE CONTROL ECU DEFECTIVE)