Tundra 4WD V8-4.6L (1UR-FE) (2010)
Oxygen Sensor Relay: Testing and Inspection
1UR-FE ENGINE CONTROL SYSTEM: A/F SENSOR HEATER RELAY: ON-VEHICLE INSPECTION
1. REMOVE INTEGRATION RELAY See: Relays and Modules - Ignition System/Ignition Relay/Testing and Inspection
2. INSPECT INTEGRATION RELAY (A/F)
NOTICE:
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Some relays are built into the integration relay. 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 below. Inspect the integration relay using the following
procedures.
(a) Measure the resistance of the A/F fuse.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(2) If the result is not as specified, replace the A/F fuse.
(b) Measure the resistance of the A/F sensor heater relay.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance: