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Simple question with too many answers Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Fri, 6 Feb 2004 04:59:53
In Reply to: Re: Excuse me for asking..., Mayor, Thu, 5 Feb 2004 22:00:53 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The Saab factory manuals provide sensor values - for example, the resistance of a temperature sensor at a given temperature, same with pressure sensors. Actuators (APC solenoid) can be checked for operation with 12 volts, and have resistance measurements, too.
The Air Mass Meter can be roughly checked, but nothing really on the bench. AMM and O2 sensors really need to be checked in the car.
Alternators can be checked for voltage in the car. Ideally you need a load rig. They're common in autoparts stores around here, but I don't know what your situation is. An oscilloscope is pretty handy for lots of troubleshooting of alternator problems, including bad diode packs. In fact, an O-scope is pretty good for lots of troubleshooting, period.
If you're low on diagnostic equipment, then you need a good meter and a good sense of how electronics work. Each sensor/motor/thingy is different. We're talking about a lot of different things here, so there is no one answer. Your best approach is to get as much information you can on each part - resistance vs temperature, normal resistance measurements, pinouts (what wire goes where inside). You'll probably want to build up some simple test rigs if you're going to be doing a the same part more than a few times.
The other good thing to have is a known good copy of each sensor, and a known good car. That way you can swap the suspect sensor into the good car, and the known good sensor into the car with problems. If this fixes things, then you're on the right track. You can also measure the suspect sensor against the known good one. Be careful with sticking the suspect sensor into the known good car - the car may run just fine, so you think the sensor must be good. Bad assumption. The Fuel Injection computers are able to deal with a wide range of sensor problems, and if some minor sensors fail, can keep working pretty well.
Are you trying to set up a shop, or just keep one car on the road? If it's a shop, you'll need to invest in some equipment and manuals, or you'll spend all your time scratching your head. There is no way we (this BB) can post all tests for all years and models. If you've got just one car to keep on the road, as problems come up you can post your questions, and somebody here should be able to help.
posted by 192.249....
, Fri, 6 Feb 2004 04:59:53 <-- Viewing This Message
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