ECU Power Source Circuit (TO 08/2009): Procedure

1. Turn the engine switch off.
   Fig 1: Identifying D2 TCM Connector Terminal

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2. Disconnect the TCM connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D2-8 (E1) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to TCM)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the TCM connectors.
   Fig 2: Identifying D2 TCM Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D2-18 (+B) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to TCM)

NG → See step   3 

OK → See step   4 

1. Turn the engine switch off.
2. Disconnect the TCM connector.
3. Remove the EFI MAIN relay from the engine room relay block.
4. Measure the resistance according to the value(s) in the table below.
   Fig 3: Identifying D2 TCM Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   D2-18 (+B) - 3	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   D2-18 (+B) or 3 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to TCM)
   *2	Engine Room Relay Block
   *3	EFI MAIN Relay

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5