causes for a non-functioning FV???(4ktq)
Marc Swanson
mswanson at cisunix.unh.edu
Tue Aug 29 01:44:19 EDT 2000
Hi Orin!,
> There is more than one ground to the ECU - pins 34, 18, 6 and 9 at least.
I verified good ground to 9 and 18. 6 and 34 have NO path to ground either
with ignition on or off. My bentley shows pins 6 and 34 going to brown
stripped wires to ground connection 91 which is "welded -1- wiring harness,
electronic ignition". Perhaps this may be the culprit??? Where is ground
connection 91? Why are they stripped wires? are they switched with
something?
> Also make sure pin 2 gets a good ground through the ignition booster
> or strange things can happen.
Hmm... I checked pin 2 vs a solid ground and I got 1.77 ohms. Is this
acceptable or too high? Additionally I got .654 ohms between pins 2 and 22
(the two wires going to the ignition booster). Where does the ignition
booster get its ground from?
> What is the resistance of the frequency valve? Has it gone open/short?
No. The FV itself is fine. I don't recall the actual resistance value, but
Nate measured that and mentioned it was ok I believe. Irregardless I don't
see a duty cycle of 50% at the CO tap which tells me something is up. Your
2 first comments had me rushing out to the garage since I hadn't checked
either of those. I think you are on the right track....
Thanks!
-Marc-
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