ECM Power Source Circuit [03/2014 - ]: Procedure

1. Disconnect the ECM connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D1-81 (E1) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND) 

OK: Go to next step 

1. Disconnect the ECM connector.

   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
   A43-28 (IGSW) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to ECM)

NG → See step   7 

OK: Go to next step 

1. Inspect the EFI MAIN relay. Refer to ON-VEHICLE INSPECTION [03/2014 - ] - Step 1 .

NG → REPLACE RELAY (EFI MAIN RELAY) 

OK: Go to next step 

1. Remove the EFI MAIN relay from the engine room relay block.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   3 (EFI MAIN relay terminal) - A43-3 (+B)	Always	Below 1 Ω
   3 (EFI MAIN relay terminal) - A43-2 (+B2)	Always	Below 1 Ω
   1 (EFI MAIN relay terminal) - A43-34 (MREL)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   3 (EFI MAIN relay terminal) or A43-3 (+B) - Body ground	Always	10 kΩ or higher
   3 (EFI MAIN relay terminal) or A43-2 (+B2) - Body ground	Always	10 kΩ or higher
   1 (EFI MAIN relay terminal) or A43-34 (MREL) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - ECM) 

OK: Go to next step 

1. Remove the EFI MAIN relay from the engine room relay block.
2. Disconnect the cable from the negative (-) battery terminal.
3. Disconnect the cable from the positive (+) battery terminal.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   5 (EFI MAIN relay terminal) - Battery positive (+) terminal	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   5 (EFI MAIN relay terminal) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI MAIN RELAY) 

OK: Go to next step 

1. Remove the EFI MAIN relay from the engine room relay block.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - BODY GROUND) 

OK → See step   12 

1. Inspect the IG2 relay. Refer to ON-VEHICLE INSPECTION [03/2014 - ] - Step 4 .

NG → REPLACE RELAY (IG2 RELAY) 

OK: Go to next step 

1. Remove the IG2 relay from the engine room relay block.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   3 (IG2 relay terminal) - A43-28 (IGSW)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - ECM) 

OK: Go to next step 

1. Remove the IG2 relay from the engine room relay block.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   5 (IG2 relay terminal) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - BATTERY) 

OK: Go to next step 

1. Remove the IG2 relay from the engine room relay block.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   2 (IG2 relay terminal) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - BODY GROUND) 

OK: Go to next step 

1. Disconnect the power management control ECU connector.
2. Remove the IG2 relay from the engine room relay block.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   1 (IG2 relay terminal) - F7-8 (IG2D)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - POWER MANAGEMENT CONTROL ECU) 

OK → See step   13