- The air fuel ratio sensor is displayed as AFS Voltage B1S1 or AFS Voltage B2S1, and the heated oxygen sensor is displayed as
O2S B1S2 or O2S B2S2, on the Techstream.
Part 2
Result:
HINT
A normal heated oxygen sensor voltage (O2S B1S2 or O2S B2S2) reacts in accordance with increases and decreases in fuel
injection volumes. When the air fuel ratio sensor voltage remains at either less or more than 3.3 V despite the heated oxygen
sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning.
NG -- REPLACE AIR FUEL RATIO SENSOR
OK -- Continue to next step.
6. CHECK AIR FUEL RATIO SENSOR
HINT
This air fuel ratio sensor test is to check the air fuel ratio sensor current during the fuel-cut. When the sensor is normal, the sensor
current will indicate below 3.0 mA in this test.
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Drive the vehicle by the drive pattern as listed below:
(1) Warm up the engine until the engine coolant temperature reaches 75锟斤拷C (167锟斤拷F) or more.
(2) Drive the vehicle at 38 mph (60 km/h) or more and decelerate the vehicle for 5 seconds or more.
(3) Repeat the deceleration above at least 3 times.
(e) Enter the following menus: Powertrain / Engine / Monitor / O2 Sensor / Details.
(f) Confirm that RANGE B1S1and RANGE B2S1 are either Pass or Fail. If the Techstream shows Incomplete, re-check RANGE B1S1
and RANGE B2S1 after performing the drive pattern.
(g) Select the RANGE B1S1 and RANGE B2S1.
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