93 850 NT not starting help!

[james78]

These are my symptoms. Engine rotates over, has spark, has good fuel pressure. Will not fire. Crankshaft trigger was replaced about 2 years ago. Has good compression. Computer codes say intermittent crankshaft trigger signal, and MAF sensor signal absent or faulty. I wanted to check the Camshaft position, and according the the haynes manual should have 12 volts on pin #1, and between 1 and 5 volts on the other two. There is no 12 volts on pin 1. I was wondering if this sounds like the computer to anyone else. This really sucks because me and this car have come a long way to include chipped exhaust valve and head gasket. Does anyone have schematics for the computers. I have worked on electronics repair for 9+ years down to component and it seems to me like the computer supplies the batter voltage to the hall effect trigger which should vary it between 5 and 0 volts. Does anyone know where to get a computer relatively cheap for a 93 850 non-turbo?

[Ozark Lee]

Does anyone have schematics for the computers.

It tells you nothing about the firmware and you need to be very patient on the download. The server is in Poland but the schematics are in English.

http://pliki.mojevolvo.pl/volvotechinfo ... n_3_39.pdf

These schematics are more user friendly but less precise:

http://www.savefile.com/files/2001813

...Lee