ECM fault?

[David Cooley]

At 02:13 PM 11/9/1999 -0700, you wrote:
>If the O2 sensor is contaminated, it's usually coated with a white powdery
>coating, and will result in a high but false O2 reading. This'll command
>"lean" from the PCM and fuel will be reduced.


I've seen this also make the O2 sensor's output be 0.00V


>A sticking TPS (over 1.25V) will disable idle control from the ECM
>
>If the IAT sensor differs from ECT by more than 5 degrees, check for high
>resistance in the ECT circuit or the sensor itself. Cleaning the IAT probe
>can help, too.


Assuming this is initial startup... if the ECT is 200 deg. and your 
cruising at 65, the IAT will be closer to ambient.



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David Cooley N5XMT Internet: N5XMT at bellsouth.net
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