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Home >> Toyota >> 2009 >> Tundra 2WD V6-4.0L (1GR-FE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Oxygen Sensor >> Testing and Inspection >> Air Fuel Ratio Sensor
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Air Fuel Ratio Sensor








1GR-FE ENGINE CONTROL SYSTEM: AIR FUEL RATIO SENSOR: ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION





1. INSPECT AIR FUEL RATIO SENSOR
(a) Disconnect the 2 sensor connectors.
(b) Measure the heater resistance according to the value(s) in the table below.
Standard resistance (for Bank 1 sensor 1):






Standard resistance (for Bank 2 sensor 1):





If the result is not as specified, replace the air fuel ratio sensor.
(c) Connect the 2 sensor connectors.
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 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 Control the Injection Volume for A/F sensor operation using the Techstream.

1. Connect the Techstream to the DLC3.
2. Start the engine and turn the Techstream main switch ON.
3. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
4. Enter the following menus: Engine and ECT / Active Test / Control the Injection Volume for A/F sensor.
5. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
6. Monitor the output voltages of the A/F and HO2 sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream.
HINT:
- The Control the Injection Volume for A/F sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
- Each sensor reacts in accordance with increases and decreases in the fuel injection volume.





NOTE: The Air-Fuel Ratio (A/F) sensor has an output delay of a few seconds and the Heated Oxygen (HO2) sensor has a maximum output delay of approximately 20 seconds.





- Following the Control the Injection Volume for A/F sensor procedure enables technicians to check and graph the voltage outputs of both the A/F and HO2 sensors.
- To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2.
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