ECM Power Source Circuit [10/2015 - ]: Procedure

1. Disconnect the semiconductor pwr integration ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Engine Room Relay Block and Junction Block Assembly

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

   Standard Voltage

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - AUXILIARY BATTERY) 

Result: 

OK 

See step  2

1. Disconnect the semiconductor pwr integration ECU connector.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1D-14 - Body ground	Always	Below 1 Ω
   1G-5 - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Inspect the semiconductor pwr integration ECU (EFI-MAIN relay, IG2 relay).

   Refer to INSPECTION [10/2015 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [10/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 03/2018]  , or refer to  REMOVAL [03/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - ] 

Result: 

OK 

See step  4

1. Disconnect the semiconductor pwr integration ECU connector.
2. Disconnect the ECM assembly connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1G-4 - A37-6 (IGSW)	Always	Below 1 Ω
   1G-6 - A37-46 (MREL)	Always	Below 1 Ω
   1G-8 - A37-2 (+B)	Always	Below 1 Ω
   1G-7 - A37-3 (+B2)	Always	Below 1 Ω
   1G-4 or A37-6 (IGSW) - Body ground and other terminals	Always	10 kΩ or higher
   1G-6 or A37-46 (MREL) - Body ground and other terminals	Always	10 kΩ or higher
   1G-8 or A37-2 (+B) - Body ground and other terminals	Always	10 kΩ or higher
   1G-7 or A37-3 (+B2) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D1-53 (E1) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the ECM assembly connector.
2. Turn the power switch on (IG).
3. Measure the voltage according to the value (s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A37-6 (IGSW) - Body ground	Power switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2015 - ] 

Result: 

NG 

See step  7

1. Disconnect the certification ECU (smart key ECU assembly) connector.
2. Disconnect the semiconductor pwr integration ECU connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J41-17 (IG1D) - 1E-1	Always	Below 1 Ω
   J41-17 (IG1D) or 1E-1 - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR