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.
Integration Relay: Inspection: Inspection
- INSPECT INTEGRATION NO. 1 RELAY
- EFI MAIN RELAY:
- Measure the resistance according to the value(s) in the table below.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard Resistance
Tester Connection Condition Specified Condition Integration relay (1E-1) - Integration relay (1B-4) Battery voltage is not applied between terminals 1B-3 and 1B-2 10 kΩ or higher Integration relay (1E-1) - Integration relay (1B-4) Battery voltage is applied between terminals 1B-3 and 1B-2 Below 1 Ω If the resistance is not as specified, replace the integration relay.
- Measure the resistance according to the value(s) in the table below.
- IG2 RELAY:
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Integration relay (1E-1) - Integration relay (1A-4) Battery voltage is not applied between terminals 1A-2 and 1A-3 10 kΩ or higher Integration relay (1E-1) - Integration relay (1A-4) Battery voltage is applied between terminals 1A-2 and 1A-3 Below 1 Ω If the resistance is not as specified, replace the integration relay.
- Measure the resistance according to the value(s) in the table below.
- HORN RELAY:
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Integration relay (1E-1) - Integration relay (1A-8) Battery voltage is not applied between terminals 1A-6 and 1A-7 10 kΩ or higher Integration relay (1E-1) - Integration relay (1A-8) Battery voltage is applied between terminals 1A-6 and 1A-7 Below 1 Ω If the resistance is not as specified, replace the integration relay.
- Measure the resistance according to the value(s) in the table below.
- EFI MAIN RELAY:
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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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