DTC B2275: STSW Monitor Malfunction: Procedure

1. Clear the DTCs. Refer to DTC CHECK/CLEAR .
2. Depress the brake pedal with the engine switch on (IG), wait at least 15 seconds, and check whether DTC B2275 recurs.

   Result

   Display (DTC output)	Proceed to
   B2275	A
   No DTC output	B

B → END (MAIN BODY ECU FAULTY) 

A: Go to next step 

1. Disconnect the A68 main body ECU connector.
   Fig 1: Identifying A68 Main Body ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. With the shift lever in P or N, depress the brake pedal fully.
3. Measure the voltage according to the value(s) in the table below.

   HINT: 

   The voltage is generated at terminal STSW for 0.3 seconds when the engine cranks.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   A68-4 (STSW) - Body ground	When operating the engine switch to crank the engine.	11 to 14 V

OK → See step   4 

NG: Go to next step 

Fig 2: Checking Harness And Connector (Main Body ECU - ECM)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A68 main body ECU connector.
2. Disconnect the A14 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   A68-4 (STSW) - A14-27 (STSW)	Always	Below 1 Ω
   A68-4 (STSW) or A14-27 (STSW) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the main body ECU with a new or normally functioning one.
2. Check that the engine starts normally.

   OK

   Engine starts normally.

NG → See step   5 

OK → END (MAIN BODY ECU FAULTY)