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 [10/2014 - ]: Procedure
- INSPECT JUNCTION BLOCK
*1 Main Body ECU - - *a Component without harness connected
(Junction Block)*b Component without main body ECU connected
(Junction Block)NOTE:Before performing the relay inspections for the relays of the junction block, inspect the ECU-IG NO. 2, ECU-IG NO. 4 and ECU-IG NO. 5 fuses.
- Inspect the IG1 NO. 1 relay.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 4F-1 - 4C-21 Battery voltage not applied to terminals 4B-46 and -4D-28 10 kΩ or higher Battery voltage applied to terminals 4B-46 and 4D-28 Below 1 Ω If the result is not as specified, replace the junction block.
- Measure the resistance according to the value(s) in the table below.
- Inspect the IG1 NO. 2 relay.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 4F-1 - 4C-41 Battery voltage not applied to terminals 4B-46 and -4D-28 10 kΩ or higher Battery voltage applied to terminals 4B-46 and 4D-28 Below 1 Ω If the result is not as specified, replace the junction block.
- Measure the resistance according to the value(s) in the table below.
- Inspect the IG1 NO. 3 relay.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 4F-1 - 4D-34 Battery voltage not applied to terminals 4B-46 and -4D-28 10 kΩ or higher Battery voltage applied to terminals 4B-46 and 4D-28 Below 1 Ω If the result is not as specified, replace the junction block.
- Measure the resistance according to the value(s) in the table below.
- Inspect the IG1 NO. 1 relay.
- INSPECT EFI MAIN RELAY (EFI MAIN)
- 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 to terminals 1 and 2 10 kΩ or higher Battery voltage applied to terminals 1 and 2 Below 1 Ω If the result is not as specified, replace the EFI main relay.
- Measure the resistance according to the value(s) in the table below.
- INSPECT EFI MAIN NO. 2 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 to terminals 1 and 2 10 kΩ or higher Battery voltage applied to terminals 1 and 2 Below 1 Ω If the result is not as specified, replace the EFI main No. 2 relay.
- Measure the resistance according to the value(s) in the table below.
- INSPECT IGNITION NO. 2 MAIN RELAY (IG2-MAIN)
- 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 to terminals 1 and 2 10 kΩ or higher Battery voltage applied to terminals 1 and 2 Below 1 Ω If the result is not as specified, replace the ignition No. 2 main relay.
- 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.
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