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
- INSPECT INTEGRATION RELAY (IG2)
- Check the IG2 fuse.
- Check the IG2 relay.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 1C-1 - 1A-4 Battery voltage not applied to terminals 1A-2 and 1A-3 10 kΩ or higher Battery voltage applied to terminals 1A-2 and 1A-3 Below 1 Ω TEXT IN ILLUSTRATION*a Component without harness connected
(Integration Relay)If the result is not as specified, replace the integration relay.
- Measure the resistance according to the value(s) in the table below.
- INSPECT INTEGRATION RELAY (EFI)
- Check the EFI No. 1 fuse.
- Check the EFI No. 1 relay.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 1C-1 - 1B-4 Battery voltage not applied to terminals 1B-2 and 1B-3 10 kΩ or higher Battery voltage applied to terminals 1B-2 and 1B-3 Below 1 Ω TEXT IN ILLUSTRATION*a Component without harness connected
(Integration Relay)If the result is not as specified, replace the integration relay.
- Measure the resistance according to the value(s) in the table below.
- INSPECT INTEGRATION RELAY (EFI NO. 2)
- Check the EFI No. 2 fuse.
- Check the EFI No. 2 relay.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 1C-1 - 1B-8 Battery voltage not applied to terminals 1B-6 and 1B-7 10 kΩ or higher Battery voltage applied to terminals 1B-6 and 1B-7 Below 1 Ω TEXT IN ILLUSTRATION*a Component without harness connected
(Integration Relay)If the result is not as specified, replace the integration relay.
- Measure the resistance according to the value(s) in the table below.
- INSPECT INSTRUMENT PANEL JUNCTION BLOCK (C/OPN) NOTE:
The circuit opening relay is built into the instrument panel junction block.
- Measure the resistance of the circuit opening relay circuit.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
TEXT IN ILLUSTRATION*a Component without harness connected
(Instrument Panel Junction Block)- - - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 2B-2 - 2A-13 Battery voltage is not applied to terminals 2B-12 and 2B-17 10 kΩ or higher Battery voltage is applied to terminals 2B-12 and 2B-17 Below 1 Ω If the result is not as specified, replace the instrument panel junction block.
- Measure the resistance according to the value(s) in the table below.
- Measure the resistance of the circuit opening relay circuit.
Use the Manual With the Right Hardware
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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.