Tundra 4WD V8-5.7L (3UR-FE) (2007)
Oxygen Sensor Relay: Testing and Inspection
ON-VEHICLE INSPECTION
1. REMOVE INTEGRATION RELAY (UNIT E)
a. Remove the engine room relay block cover.
b. Using a screwdriver, detach the 2 claws and remove the integration relay from the engine room relay block.
HINT: Tape the screwdriver tip before use.
c. Disconnect the 3 connectors.
2. INSPECT INTEGRATION RELAY (A/F)
NOTE:
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Some relays are built into the integration relay (unit E). The integration relay cannot be disassembled. If there is a malfunction in the circuit of
the integration relay, replace the integration relay.
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The internal circuit of the integration relay is as shown in the illustration. Inspect the integration relay using the following procedures.
a. Measure the resistance of the A/F fuse.