Inspection Procedure

1. Delete the DTC (See DTC CHECK / CLEAR ).

   HINT:

   After all DTCs are cleared, check if the trouble occurs again 50 seconds after the engine switch is turned on (IG).

2. Check for DTCs again.

   OK: 

   No DTC is output. 

NG:  Go to step 2 below.

OK: END 

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

   Voltage 

   VOLTAGE SPECIFICATION
   
   

   Terminal No. (Symbol)	Condition	Specified condition
   D44-31 (CTSW) - Body ground	Brake pedal depressed, Ignition switch START	Below 1 V

   HINT:

   Voltage is output only when the engine is cranking.

Fig 1: Identifying D44 ECU Connector Terminal CTSW

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NG:  Go to step  4

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 A24 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Resistance 

   Fig 3: Disconnecting A24 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   RESISTANCE SPECIFICATION
   
   

   Terminal No. (Symbol)	Specified Condition
   D44-31 (CTSW) - A24-17 (ACCR)	Below 1 Ω
   D44-31 (CTSW) - 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 starts.

   OK: 

   Engine can start normally. 

NG: GO TO SFI SYSTEM. Refer to  SFI SYSTEM 

OK: END (POWER SOURCE CONTROL ECU DEFECTIVE)