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 MANUALSTOYOTA2009LANDCRUISER V8-5.7L (3UR-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSMAIN RELAY (COMPUTER/FUEL SYSTEM)TESTING AND INSPECTION
2009 Toyota Landcruiser V8-5.7L (3UR-FE)
Main Relay (Computer/Fuel System): Testing and Inspection
2009 Toyota Landcruiser V8-5.7L (3UR-FE)SECTION Testing and Inspection
3UR-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 relay.
2. INSPECT INTEGRATION RELAY (IG2)
(a) Measure the resistance of the IG2 MAIN fuse.
(1) Remove the IG2 MAIN fuse from the integration relay.
(2) 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.
(3) Install the IG2 MAIN fuse to the integration relay.
(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 MAIN fuse.
(1) Remove the EFI MAIN fuse from the integration relay
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
If the result is not as specified, replace the EFI MAIN fuse.
(3) Install the EFI MAIN fuse to the integration relay.
(b) Measure the resistance of the EFI 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 EFI NO. 2 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 relay.
5. INSPECT INTEGRATION RELAY (A/F)
(a) Measure the resistance of the A/F fuse.
(1) Remove the A/F fuse from the integration relay.
(2) 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.
(3) Install the A/F fuse to the integration relay.
(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.
6. INSPECT MAIN BODY ECU (IG1 NO. 1)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
If the result is not as specified, replace the main body ECU.
7. INSPECT STARTER RELAY (ST) Testing and Inspection
8. INSPECT STARTER CUT RELAY (ST CUT) Testing and Inspection
9. INSPECT MAIN BODY ECU (ACC RELAY) Testing and Inspection
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.