ECM Power Source Circuit [11/2015 - 07/2020]: Procedure

1. Disconnect the No. 1 integration relay connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   1A-10 - Body ground	Always	11 to 14 V
   1B-3 - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  2

1. Inspect the No. 1 integration relay (EFI-MAIN relay, IG2 NO. 1 relay).

   Refer to INSPECTION [11/2015 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 07/2020] 

Result: 

OK 

See step  3

1. Disconnect the No. 1 integration relay connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   (A40)

   (A40)

   Tester Connection	Condition	Specified Condition
   1A-9 - A40-6 (IGSW)	Always	Below 1 Ω
   1B-6 - A40-46 (MREL)	Always	Below 1 Ω
   1B-4 - A40-2 (+B)	Always	Below 1 Ω
   1B-4 - A40-3 (+B2)	Always	Below 1 Ω
   1A-9 or A40-6 (IGSW) - Body ground and other terminals	Always	10 kΩ or higher
   1B-6 or A40-46 (MREL) - Body ground and other terminals	Always	10 kΩ or higher
   1B-4 or A40-2 (+B) - Body ground and other terminals	Always	10 kΩ or higher
   1B-4 or A40-3 (+B2) - Body ground and other terminals	Always	10 kΩ or higher

   HINT: 

   If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the No. 1 integration relay connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1A-8 - Body ground	Always	Below 1 Ω
   1B-5 - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

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

   Standard Resistance

   (C31)

   (C31)

   Tester Connection	Condition	Specified Condition
   C31-59 (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

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

   Standard Voltage

   (A40)

   (A40)

   Tester Connection	Condition	Specified Condition
   A40-6 (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 [11/2015 - ] 

Result: 

NG 

See step  7

1. Disconnect the certification ECU (smart key ECU assembly) connector.
2. Disconnect the No. 1 integration relay connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   (F1)

   (F1)

   Tester Connection	Condition	Specified Condition
   F1-17 (IG1D) - 1A-7	Always	Below 1 Ω
   F1-17 (IG1D) or 1A-7 - Body ground and other terminals	Always	10 kΩ or higher

   HINT: 

   If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

GO TO SMART KEY SYSTEM (FOR START FUNCTION). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR