2010 Lexus LS 460L AWDFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

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 on.
  3. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
  4. On the Techstream, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F sensor.
  5. Perform the Active Test operation with the engine idling (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 B1 S1 and O2S B1 S2 or AFS Voltage B2 S1 and O2S B2 S2) 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.
Tester Display (Sensor) Injection Volume Status Voltage
AFS Voltage B1 S1 or AFS Voltage B2 S1
(A/F)		 +25% Rich Less than 3.1 V
AFS Voltage B1 S1 or AFS Voltage B2 S1
(A/F)		 -12.5% Lean More than 3.4 V
O2S B1 S2 or O2S B2 S2
(HO2)		 +25% Rich More than 0.55 V
O2S B1 S2 or O2S B2 S2
(HO2)		 -12.5% Lean Less than 0.4 V
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.

Case A/F Sensor (Sensor 1) Output Voltage HO2 Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area
1
GTY102471GTY125098Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002© TOYOTA, LICENSE AGREEMENT TMS1002
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