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INPUT SENSORS

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 299, FIG 9-26. DESIGN. ONE WIRE TWO WIRE THREE WIRE FOUR WIRE

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INPUT SENSORS

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  1. INPUT SENSORS OXYGEN SENSORS

  2. 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 299, FIG 9-26

  3. DESIGN • ONE WIRE • TWO WIRE • THREE WIRE • FOUR WIRE • SOME HAVE INTERNAL HEATERS

  4. 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

  5. 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

  6. 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)

  7. 299C & 300C ZIRCONIA 02 SENSOR ZIRCONIA TYPE SENSOR GENERATES VOLTAGE

  8. C301 TITANIA 02 SENSOR TITANIA SENSOR MODIFIES VOLTAGE

  9. 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 415

  10. 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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