Fault codes come from the fuel injection system diagnostic circuitry, which can store up to three faults. They can be read through the check engine light in the dash. You'll need to make a switched test lead with a spade connector on one end for connecting to the test connector. The other end is connected to ground. In 1992 the test connector is located beneath rear seat in sedan, or under the bellows ahead of shifter in convertible. With ignition off and test lead off, connect test lead to ground and test connector pin 2. turn ignition key to ON When Check Engine light comes on, turn test lead switch ON; Check Engine light should immediately go out When Check Engine light flashes ONCE, IMMEDIATELY turn test lead switch OFF Any fault codes will flash through the Check Engine light, with a long flash at beginning and end of each code; code flashes are short flashes, each block of flashes is separated by a longer space. With the engne OFF, the first fault code is that for "No RPM" 1 2 2 3 1, it will look like oooo x xx xx xxx x oooo where o = steady on, x = single flash There are over 20 fault codes, so get yourself a copy of the best source of info on this car: the "Bentley Bible" aka the Saab 900 Official Service Manual, costs about $40 from Amazon 16 valve manual: http://www.amazon.com/Saab-900-Valve-Service-Manual/dp/0837603137 8 valve manual :http://www.amazon.com/Eight-Official-Service-Manual-1981-1988/dp/0837603102 Hope this helps, if it does please give a "thumbs up", thanks Saabreur
To cycle to teh next simply turn the test switch lead ON, wait till the Check Engine light flashes ONCE, then turn the test lead switch OFF, when new codes if any start to flash.
Letting the Check Engine light flash TWICE restarts the test sequence. Letting it flash THREE times can reset (wipes out) all the stored codes. The code 00000 indicates no more faults, and should be seen to be able to reset code memory.
Saabreur
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