Inspection Procedure

1. Delete the DTC (See 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: Go to step 2 

OK : END 

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

   Voltage 

   TERMINAL SPECIFIED CONDITION CHART
   
   

   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.

   Fig 1: Inspecting Power Source Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE POWER SOURCE CONTROL ECU 

OK: Go to next step 

1. Disconnect the D44 ECU connector.
   Fig 2: Disconnecting D44 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A55 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Resistance 

   TERMINAL SPECIFIED CONDITION CHART
   
   

   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 

Fig 3: Identifying A55 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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)