Anders, opinion? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Anders, opinion?
Posted by Dean (more from Dean) on Thu, 8 Aug 2002 09:17:39
In Reply to: Dean! re:coolant temp sensor shorted, franks, Wed, 7 Aug 2002 22:03:07
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Well, cold is not very cold these days. The cold resistance seems to be the right range.
Where did you find the sensor, near the thermostat or at the intake manifold?
It would be interesting to measure the resistance on a hot engine, should be around 150-200 I expect. I think that the ECU after the engine runs for a while, is expecting that the sensor should be at a low resistance. Perhaps it is not. Could be a bat coolant thermostat. Cold engine, open hood, start and feel the upper rad hose. It should stay cool until the engien is hot, then when the stat opens it should become hot very suddenly. If it just slowly gets warm as the engine heats up, the stat is bad.
On the Trionic, the sensor goes to the ECU. The ECU drives the temp guage. The ECU makes the temp guage read 9'oclock for any temperatures within a range. So you don't see the fluxuations that are always there. On a vehicle with a direct sensor to temp indicator connection you will see the temp constantly moving around as the stat is always opening and closing.
I don't know what high input means. It might mean high resistance. So who knows. Maybe Anders will chime in.
Your idle speed sounds about right. With the trionic the idle speed it controlled around 900 rpm, but the needle on the tach seems to be closer to the 1000 point, thats tach indicator error. Probably no problem there. Remember that the ECUs are not stupid. It knows that after a long time the engine is warmed up and will not be keeping the engine in warm up mode indefinately. Note that it knows there is a problem because the sensor is not within range withing a givne time window.
So do the stat warmup test. Perhaps $35 is not a big deal.
posted by 208.24.179...
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