12-20-2018, 02:47 AM
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#18
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Join Date: May 2007
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Re: OBD Code Definitions 1993 Trans Sport
Quote:
Originally Posted by Tech II
Quad driver faults tend to lead towards an ECM......
Basically, a Quad driver commands up to 4 different circuits......if the quad driver gets the wrong data from a circuit, it sets a quad code.....
Not easy to diagnose....proper testing, is you isolate each circuit the quad driver runs..........this is labor intensive, and most techs would just swap out an ECM from another vehicle(must be the same number, and if the PROM is different, have to swap them also), and if it took care of the problem, then they would just order an ECM, with the latest PROM for it.....
Like I said, more often than not, it's the ECM.......but with this time and mileage on it, it could be the circuit, a component in the circuit, or a bad connection also.....like I said, not easy to diagnose.....
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Does this 1993 3.8 have an interchangeable PROM? Can I put the original PROM into a matching PCM from the wreckers?
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1923 Model T 'Stake' Truck, see in Legends of the Fall
1949 Chevy 3/4 Ton, had 214 ci now 235ci
1959 Dodge Mayfair
1986 Ford Ranger 4 cyl
1993 Pontiac TransSport 3.8
1996 Chevy 3/4 Ton 4x4
1999 Oldsmobile Alero
2004 BMW 330i
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