ECU Power Source Circuit [11/2022 - 09/2024]: Procedure
WARNING: This page is about a different variant/trim than selected.
- CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)
- Disconnect the C80 TCM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition C80-2 (E1) - Body ground Always Below 1 Ω - Connect the C80 TCM connector.
Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 2
- INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL)
- Disconnect the C80 TCM connector.
- Turn the engine switch on (IG).
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition C80-1 (+B) - Body ground Engine switch on (IG) 11 to 14 V - Connect the C80 TCM connector.
Result
Result Proceed to OK A NG B
Result:
A
CHECK FOR INTERMITTENT PROBLEMS
Refer to CHECK FOR INTERMITTENT PROBLEMS [06/2018 - 09/2024]
Result:
B
See step 3
- CHECK HARNESS AND CONNECTOR (TCM - EFI-MAIN NO. 1 RELAY)
- Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
- Disconnect the C80 TCM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition C80-1 (+B) - 3 (EFI-MAIN NO. 1 relay) Always Below 1 Ω C80-1 (+B) or 3 (EFI-MAIN NO. 1 relay) - Body ground Always 10 kΩ or higher - Connect the C80 TCM connector.
- Install the EFI-MAIN NO. 1 relay to the No. 1 engine room relay block and No. 1 junction block assembly.
Result
Proceed to OK NG
Result:
OK
GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM)
Refer to ECM Power Source Circuit [11/2022 - 03/2023] , or refer to ECM Power Source Circuit [03/2023 - 09/2024]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR