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.

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HOMESERVICE MANUALSTOYOTA2009YARIS BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEM (1NZ-FE)INTEGRATION RELAYINSPECTION

2009 Toyota Yaris Base, 4D Sedan, Automatic

Integration Relay: Inspection

2009 Toyota Yaris Base, 4D Sedan, AutomaticSECTION Inspection

INSPECT INTEGRATION RELAY

Inspect the EFI (20A) fuse.

Disconnect the fuse.

Using an ohmmeter, measure the resistance of the fuse.

Standard resistance

RESISTANCE REFERENCE

Tester Connection	Specified Condition
1 - 2	Below 1 Ω

Inspect the EFI relay.

Using an ohmmeter, measure the resistance between the terminals.

Standard resistance

RESISTANCE REFERENCE

Tester Connection	Specified Condition
A4 - C1	10 kΩ or higher
A4 - C1	Below 1 Ω (Battery voltage applied between terminals A2 and A3)

Fig 1: Inspecting Integration Relay

RENDER: 1.0x

NO RELATED

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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.