ECM Power Source Circuit [08/2013 - ]: Procedure

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the No. 1 integration relay from the engine room relay block.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   1C-1 - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block
   *a	Front view of wire harness connector (to No. 1 Integration Relay)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY) 

OK: Go to next step 

1. Inspect the No. 1 integration relay (EFI MAIN). Refer to ON-VEHICLE INSPECTION [08/2013 - ] - Step 3 .

NG → See step   9 

OK: Go to next step 

1. Check the harness and connectors between the No. 1 integration relay and ECM.
   1. Remove the No. 1 integration 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

      Tester Connection	Condition	Specified Condition
      G44-9 (MREL) - 1B-2	Always	Below 1 Ω
      G44-22 (+B) - 1B-4	Always	Below 1 Ω
      G44-23 (+B2) - 1B-4	Always	Below 1 Ω
      G44-9 (MREL) or 1B-2 - Body ground	Always	10 kΩ or higher
      G44-22 (+B) or 1B-4 - Body ground	Always	10 kΩ or higher
      G44-23 (+B2) or 1B-4 - Body ground	Always	10 kΩ or higher

2. Check the harness and connectors between the No. 1 integration relay and body ground.
   1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      1B-3 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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
   C30-12 (E1) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the ECM connectors.
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
   G45-21 (IGSW) - C30-12 (E1)	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   6 

OK → See step   10 

1. Inspect the No. 1 integration relay (IG2). Refer to ON-VEHICLE INSPECTION [08/2013 - ] - Step 2 .

NG → See step   11 

OK: Go to next step 

1. Remove the No. 1 integration 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

   Tester Connection	Condition	Specified Condition
   1A-5 - G45-21 (IGSW)	Always	Below 1 Ω
   1A-5 or G45-21 (IGSW) - Body ground	Always	10 kΩ or higher

   RESULT
   
   

   Result	Proceed to
   Out of normal range	A
   Within normal range	B

B → See step   8 

A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the No. 1 integration relay from the engine room relay block.
2. Disconnect the power management control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1A-1 - G38-8 (IG2D)	Always	Below 1 Ω
   1A-3 - Body ground	Always	Below 1 Ω
   G38-8 (IG2D) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   12