DTC B2275: STSW Monitor Malfunction: Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC OUTPUT
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

INSPECT POWER SOURCE CONTROL ECU

Measure the voltage according to the value(s) in the table below.

Fig 1: Identifying Power Source Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM)

Disconnect the D44 ECU connector.

Fig 2: Identifying D44 ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the A55 ECM connector.

Fig 3: Identifying A55 ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

CHECK POWER SOURCE CONTROL ECU OPERATION
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 SFI SYSTEM

OK → END (POWER SOURCE CONTROL ECU DEFECTIVE)