ECM Power Source Circuit: Procedure

1. Turn the power switch on (IG).

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

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   A13-2 (+B) - E3-1 (E1)	Power switch on (IG)	11 to 14 V
   A13-1 (+B2) - E3-1 (E1)	Power switch on (IG)	11 to 14 V

NG → See step   2 

OK → See step   10 

1. Disconnect the E3 ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   E3-1 (E1) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the power switch on (IG).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   A14-8 (IGSW) - E3-1 (E1)	Power switch on (IG)	11 to 14 V

OK → See step   6 

NG → See step   4 

1. Remove the ECU-IG fuse from the engine room No. 2 junction block.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   ECU-IG	Always	Below 1 Ω

NG → CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

OK: Go to next step 

1. Inspect the IG2 relay. Refer to ON-VEHICLE INSPECTION [09/2012 - ] .

NG → REPLACE IGNITION RELAY NO. 2 (IG2) 

OK → See step   11 

1. Turn the power switch on (IG).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   A14-3 (MREL) - E3-1 (E1)	Power switch on (IG)	11 to 14 V

NG → See step   12 

OK: Go to next step 

1. Remove the EFI MAIN2 fuse from the engine room No. 2 relay block.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   EFI MAIN2	Always	Below 1 Ω

NG → CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

OK: Go to next step 

1. Inspect the EFI MAIN2 relay. Refer to ON-VEHICLE INSPECTION [09/2012 - ] .

NG → REPLACE EFI RELAY (EFI MAIN2) 

OK: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the harness and the connectors between the integration relay and ECM.
   1. Remove the EFI MAIN2 relay from the engine room No. 2 relay block.
   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
      EFI MAIN2 relay (1) - A14-3 (MREL)	Always	Below 1 Ω
      EFI MAIN2 relay (1) or A14-3 (MREL) - Body ground	Always	10 kΩ or higher

2. Check the harness and the connectors between the EFI MAIN2 relay and body ground.
   1. Remove the EFI MAIN2 relay from the engine room No. 2 relay block.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection	Condition	Specified condition
      EFI MAIN2 relay (2) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → CHECK AND REPAIR HARNESS OR CONNECTOR (TERMINAL +B OF ECM - BATTERY POSITIVE TERMINAL)