PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

yet ANOTHER O2 problem!!

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Old Mar 12, 2006 | 04:25 PM
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Default yet ANOTHER O2 problem!!

I'm doing some tuning for a friend of mine and his passenger 02 has messed up once again. We just did a head swap on the car, and now I get no reading on the o2. It sits at a constant 0mV. We checked the power wire and its getting power. Have checked the harness for any pinching,etc. and found nothing. We threw a simulator on that side and it does the same thing, 0mV. This leads me to believe that the o2 is still ok(its only about a month old). If ANYONE has any solution, I would be extremely grateful. Thanx.
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Old Mar 12, 2006 | 04:41 PM
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And also all the fuel trims are sitting at -100
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Old Mar 14, 2006 | 11:38 AM
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ttt...
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Old Mar 14, 2006 | 12:45 PM
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check the connector on the harness side ?
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Old Mar 15, 2006 | 12:22 AM
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Yea checked the wires all the way back to the PCM. Nothing. I am absolutely baffled by this thing!!
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Old Mar 15, 2006 | 01:03 AM
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Originally Posted by KALEL
I'm doing some tuning for a friend of mine and his passenger 02 has messed up once again. We just did a head swap on the car, and now I get no reading on the o2. It sits at a constant 0mV. We checked the power wire and its getting power. Have checked the harness for any pinching,etc. and found nothing. We threw a simulator on that side and it does the same thing, 0mV. This leads me to believe that the o2 is still ok(its only about a month old). If ANYONE has any solution, I would be extremely grateful. Thanx.
With the car completely cold start the car and immediately log the O2 voltages. If you still see 0 mV you have a short or there the input receiver is damaged in the PCM. You should see ~450 mV until the PCM believes the O2 sensors are heated.

Tim
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