Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
On-Vehicle Inspection [10/2023 - ]: Procedure
- INSPECT NO. 1 ELECTRONIC FUEL INJECTION MAIN RELAY (EFI-MAIN NO. 1)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher Battery voltage applied between terminals 1 and 2 Below 1 Ω If the result is not as specified, replace the No. 1 electronic fuel injection main relay (EFI-MAIN NO. 1).
- Measure the resistance according to the value(s) in the table below.
- INSPECT NO. 2 ELECTRONIC FUEL INJECTION MAIN RELAY (EFI-MAIN NO. 2)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher Battery voltage applied between terminals 1 and 2 Below 1 Ω If the result is not as specified, replace the No. 2 electronic fuel injection main relay (EFI-MAIN NO. 2).
- Measure the resistance according to the value(s) in the table below.
- INSPECT NO. 3 ELECTRONIC FUEL INJECTION MAIN RELAY (EFI-MAIN NO. 3)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher Battery voltage applied between terminals 1 and 2 Below 1 Ω If the result is not as specified, replace the No. 3 electronic fuel injection main relay (EFI-MAIN NO. 3).
- Measure the resistance according to the value(s) in the table below.
- INSPECT ELECTRONIC DRIVER UNIT RELAY (EDU)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher Battery voltage applied between terminals 1 and 2 Below 1 Ω If the result is not as specified, replace the electronic driver unit relay (EDU).
- Measure the resistance according to the value(s) in the table below.
- INSPECT AIR FUEL RATIO SENSOR HEATER RELAY (A/F HTR)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher Battery voltage applied between terminals 1 and 2 Below 1 Ω If the result is not as specified, replace the air fuel ratio sensor heater relay (A/F HTR).
- Measure the resistance according to the value(s) in the table below.
- INSPECT IGP NO. 1 RELAY (IGP NO. 1)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher Battery voltage applied between terminals 1 and 2 Below 1 Ω If the result is not as specified, replace the IGP NO. 1 relay (IGP NO. 1).
- Measure the resistance according to the value(s) in the table below.
- INSPECT IGT/INJ RELAY (IGT/INJ)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher Battery voltage applied between terminals 1 and 2 Below 1 Ω If the result is not as specified, replace the IGT/INJ relay (IGT/INJ).
- Measure the resistance according to the value(s) in the table below.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.