ECM Power Source Circuit [01/2019 - 09/2022]: Procedure
- CHECK HARNESS AND CONNECTOR (POWER SOURCE OF NO. 1 INTEGRATION RELAY)
- Disconnect the No. 1 integration relay connector.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition 2A-10 - Body ground Always 11 to 14 V 2B-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
- INSPECT NO. 1 INTEGRATION RELAY (EFI-MAIN RELAY, IG2 NO. 1 RELAY)
- Inspect the No. 1 integration relay (EFI-MAIN relay, IG2 NO. 1 relay).
Refer to INSPECTION [01/2019 - 09/2022]
Result
Proceed to OK NG
Result:
NG
REPLACE NO. 1 INTEGRATION RELAY. Refer to REMOVAL [01/2019 - 03/2019] , or refer to REMOVAL [03/2019 - 09/2022]
Result:
OK
See step 3
- Inspect the No. 1 integration relay (EFI-MAIN relay, IG2 NO. 1 relay).
- CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM)
- Disconnect the No. 1 integration relay connector.
- Disconnect the ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 2A-9 - A46-6 (IGSW) Always Below 1 Ω 2B-6 - A46-46 (MREL) Always Below 1 Ω 2B-4 - A46-2 (+B) Always Below 1 Ω 2B-4 - A46-3 (+B2) Always Below 1 Ω 2A-9 or A46-6 (IGSW) - Body ground and other terminals Always 10 kΩ or higher 2B-6 or A46-46 (MREL) - Body ground and other terminals Always 10 kΩ or higher 2B-4 or A46-2 (+B) - Body ground and other terminals Always 10 kΩ or higher 2B-4 or A46-3 (+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
- CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)
- Disconnect the No. 1 integration relay connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 2A-8 - Body ground Always Below 1 Ω 2B-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
- CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
- Disconnect the ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition C77-59 (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
- INSPECT ECM (IGSW VOLTAGE)
*a Front view of wire harness connector
(to ECM)- Disconnect the ECM connector.
- Turn the power switch on (IG).
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A46-6 (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 [01/2019 - 04/2020] , or refer to PROBLEM SYMPTOMS TABLE [04/2020 - 09/2022]
Result:
NG
See step 7
- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INTEGRATION RELAY)
- Disconnect the certification ECU (smart key ECU assembly) connector.
- Disconnect the No. 1 integration relay connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I1-15 (IG1D) - 2A-7 Always Below 1 Ω I1-15 (IG1D) or 2A-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 [01/2019 - 09/2022]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR