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 MANUALSTOYOTA2009SEQUOIA 4WD V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSMAIN RELAY (COMPUTER/FUEL SYSTEM)TESTING AND INSPECTION
2009 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)
Main Relay (Computer/Fuel System): Testing and Inspection
2009 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)SECTION Testing and Inspection
2UZ-FE ENGINE CONTROL: RELAY: ON-VEHICLE INSPECTION
ON-VEHICLE INSPECTION
1. INSPECT CIRCUIT OPENING RELAY (C/OPN)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
If the result is not as specified, replace the circuit opening relay.
2. INSPECT INTEGRATION RELAY (IG2)
(a) Measure the resistance of the IG2 MAIN fuse.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
If the result is not as specified, replace the IG2 MAIN fuse.
(b) Measure the resistance of the ignition relay No. 2 (IG2) circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
If the result is not as specified, replace the integration relay.
3. INSPECT INTEGRATION RELAY (EFI)
(a) Measure the resistance of the EFI No. 1 fuse.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
If the result is not as specified, replace the EFI No. 1 fuse.
(b) Measure the resistance of the EFI MAIN relay circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
If the result is not as specified, replace the integration relay.
4. INSPECT INTEGRATION RELAY (A/F)
(a) Measure the resistance of the A/F fuse.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
If the result is not as specified, replace the A/F fuse.
(b) Measure the resistance of the A/F sensor heater relay circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
If the result is not as specified, replace the integration relay.
5. INSPECT FUEL PUMP RELAY
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
If the result is not as specified, replace the fuel pump 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.