HOW TO PROCEED WITH TROUBLESHOOTING HINT: This is a flowchart for vehicle pull. 
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Toyota Tundra Service Manual > 1ur-fe Engine Control: A/f Sensor Heater Relay
On-vehicle InspectionON-VEHICLE INSPECTION PROCEDURE 1. REMOVE INTEGRATION RELAY 2. INSPECT INTEGRATION RELAY (A/F) NOTICE: 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 ...
