Re: Reading OBDII? (96-98) - Saab 9000 Bulletin Board - Saabnet.com
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Re: Reading OBDII? (96-98)
Posted by BobS (more from BobS) on Mon, 18 Oct 2004 18:28:34
In Reply to: Experience with OBDII? (96-98), TonyJ [Profile/Gallery]
, Mon, 18 Oct 2004 15:44:10
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If the CEL is not on, most likely there are no codes.
You could take a look at the short and long term trim to get an idea how the control has adjusted to the engine conditions. Short term limit is + - 25% and long term + - 100%. Trim for either less than about 1/2 of their limit is ok with smaller values better.
You can also look at MAP, TPS, and engine temperature values. The MAP sensor should be 95 to 105 mbar with engine off. TPS should be about .5 volt at idle and 4.5 volt at full throttle. The TPS reading should change smoothly when the throttle is moved slowly through its range. Engine temperature should read about ambient for an engine that has not run over night to 180-190 degrees at operating temperature.
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