Inspection Procedure

1. Connect the intelligent to the DLC3.
2. Turn the engine switch ON (IG) and press the intelligent tester main switch on.
3. Read the Data List according to the displays on the tester.

PWR SOURCE CTRL (Power source control ECU): 

OK: 

"RUN" (engine switch is on (START)) appears on the screen. 

"STOP" (engine switch is off, on (IG) or on (ACC)) appears on the screen. 

NG:  Go to step 2 below.

OK: GO TO  SFI SYSTEM 

1. Disconnect the D44 ECU connector.
   Fig 1: Identifying D44 ECU Connector Terminal TACH

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D41 ECM connector.
Fig 2: Identifying D41 ECM Connector Terminal TACH
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   D44-2 (TACH) - D41-1 (TACH)	Below 1 Ω
   D44-2 (TACH) - 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 for power source control ECU DTCs.

   OK: 

   Power source control ECU DTCs are not output. 

NG: GO TO  SFI SYSTEM 

OK: END (POWER SOURCE CONTROL ECU DEFECTIVE)