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js9924 · 04-07-2008, 12:24 PM

that is not the correct way to check the o2 sensor. you need to check the sensor when the car is running. the o2 puts out a very small millivolt reading check it by starting up the vehicle, then either pressing your probes through the shielding or by pressing pins into the wires and attaching your leads to the pins, you should be able to watch the millivolt reading fluctuate until it warms up then remain fairly constant you can check the heater when it is unplugged however. you do that by putting you ohmmeter probes at B+ and HT- which should be the two pins opposite the retaining clip on the harness. if you have trouble look at the FSM links in the sticky for pics. good luck

It looks like you are testing the heater and that is within spec

04-07-2008, 12:24 PM	#4 (permalink)
js9924 Registered User Join Date: Feb 2007 Location: Tampa, Fl Posts: 183	that is not the correct way to check the o2 sensor. you need to check the sensor when the car is running. the o2 puts out a very small millivolt reading check it by starting up the vehicle, then either pressing your probes through the shielding or by pressing pins into the wires and attaching your leads to the pins, you should be able to watch the millivolt reading fluctuate until it warms up then remain fairly constant you can check the heater when it is unplugged however. you do that by putting you ohmmeter probes at B+ and HT- which should be the two pins opposite the retaining clip on the harness. if you have trouble look at the FSM links in the sticky for pics. good luck It looks like you are testing the heater and that is within spec __________________ '94 T100 3.0 My mods page: http://www.angelfire.com/fl4/dmb Last edited by js9924; 04-07-2008 at 12:26 PM.