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INPUT SENSORS. OXYGEN SENSORS. 02 SENSOR DESIGN. THREADED INTO EXHAUST SYSTEM ELEMENT INSIDE STEEL SHELL ELEMENT MADE FROM ZIRCONIA COVER OVER TOP PORTION AND ALLOWS OXYGEN TO OUTER PORTION OF ELEMENT. CLASS PAGE 168, FIG 8-26. DESIGN. ONE WIRE TWO WIRE THREE WIRE FOUR WIRE

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Input sensors

INPUT SENSORS

OXYGEN SENSORS


02 sensor design
02 SENSOR DESIGN

  • THREADED INTO EXHAUST SYSTEM

  • ELEMENT INSIDE STEEL SHELL

  • ELEMENT MADE FROM ZIRCONIA

  • COVER OVER TOP PORTION AND ALLOWS OXYGEN TO OUTER PORTION OF ELEMENT

CLASS PAGE 168, FIG 8-26


Design
DESIGN

  • ONE WIRE

  • TWO WIRE

  • THREE WIRE

  • FOUR WIRE

  • SOME HAVE INTERNAL HEATERS


Operation
OPERATION

  • PRODUCES IT’S OWN VOLTAGE

    • O2 ON BOTH SIDES OF ELEMENT, PRODUCES A LOW VOLTAGE

    • DIFFERENT AMOUNTS OF OXYGEN ON BOTH SIDE OF ELEMENT, PRODUCES A HIGH VOLTAGE

  • VOLTAGE CHANGES OCCUR IN MILLISECONDS

  • CROSS COUNTS


Cautions
CAUTIONS

  • IF LEAD COATS THE ELEMENT, GENERALLY WILL DESTROY SENSOR

  • IF ANTI-FREEZE OR RTV SILICONE IS USED, WILL RUIN 02 SENSOR

  • MUST USE A DIGITAL METER TO TEST

  • TIGHTENING - USE ANTI-SEIZE


Type of 02 sensors
TYPE OF 02 SENSORS

  • ZIRCONIA - PRODUCES IT’S OWN VOLTAGE

  • TITANIA - MODIFIES A BIAS VOLTAGE SENT TO IT FROM THE POWERTRAIN CONTROL MODULE

    • (USUALLY ABOUT .45 VOLTS)


Testing 02 sensors
TESTING 02 SENSORS

  • 02 SENSOR MUST BE AT NORMAL OPERATING TEMP. (600 DEGREES)

  • DEDICATED SENSOR GROUND

  • AVOID PIERCING INSULATION (IF MUST, THAN RESEAL HOLE)

  • DON’T USE ANALOG METER

    • USE DVOM

LAB PAGE 140


Testing
TESTING

  • SCANNER

  • USE ENGINE ANALYZER LAB SCOPE

  • USE PORTABLE LAB SCOPE

  • PROPANE TORCH

  • USE YOUR BODY TO TRICK PCM

  • HEATER DIAGNOSIS


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