The O2 actually sets closed loop before the CTS, but if the ECM doesn't see
the CTS voltage in the pre plotted time.
The ECM goes into back up fuel. There are more than one levels of back up
fuel on a GM ECM. There are algorithms set for: CTS, O2, Ignition module
timing (Usually code 42) and excessively rich conditions.
It's just been overwork, lack of sleep and sleazy real-estate deals making
me the crazier than normal person that I am. It's actually starting to cloud
my judgment. Glad I got some sleep last night and today.
Thanks for the help Marsh!
If I could only get rid of this headache, and convince the governor to have
an open day on real-estate agents, my smile would return!
It is the sensor located in or closest to the thermostat housing:
It is a thermistor, and I don't have my chart for the temperature to
resistance values here.
It's a two wire plug, with very small pins, so don't bend them. A better
way to do it is: The wire going in carries a 5 volt input signal, and
the wire exiting at a cold start should be 0 volts.
As it warms, the voltage should climb,
anyone in the group,
with my screw ups lately, please tell this guy if I'm wrong?
The voltage on the wire to the ECM should increase in voltage as the
I hope this helps?
So far, looks like you're advice is pretty
much solid. The only thing you may be off
on is that the system should go "closed loop"
even with a bad CTS. A function of the O2
sensor, is to act as a switch for closed loop
I believe. If i'm wrong.....we'll here bout it
in short order. lol
here's a site to reinforce yer advice.
Repair for CTS
Address:http://www.lotuselancentral.com/cts.htm Changed:5:55 AM on
Friday, August 6, 2004