LS 460 RWD V8-4.6L (1UR-FSE) (2010)
Oxygen Sensor: Testing and Inspection
Air Fuel Ratio Sensor
1UR-FSE ENGINE CONTROL SYSTEM: AIR FUEL RATIO SENSOR (for 2WD): ON-VEHICLE INSPECTION
1. INSPECT AIR FUEL RATIO SENSOR
(a) Disconnect the air fuel ratio sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(c) If the result is not as specified, replace the air fuel ratio sensor.
2. INSPECT AIR-FUEL RATIO COMPENSATION SYSTEM
HINT
Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F sensor function provided in the Active
Test. The A/F CONTROL (Control the Injection Volume for A/F sensor) function can help to determine whether the Air-Fuel Ratio
(A/F) sensor, Heated Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the A/F CONTROL (Control the Injection Volume for A/F sensor) operation
using the Techstream.
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Connect the Techstream to the DLC3.
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Start the engine and turn the tester ON.
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Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
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On the tester, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F sensor.
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Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel
injection volume).
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Monitor the output voltages of the A/F and HO2 sensors (AFS B1 S1 and O2S B1 S2 or AFS B2 S1 and O2S B2 S2) displayed on
the tester.
HINT
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The A/F CONTROL (Control the Injection Volume for A/F sensor) operation lowers the fuel injection volume by 12.5% or
increases the injection volume by 25%.
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Each sensor reacts in accordance with increases and decreases in the fuel injection volume.