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Hi Art, so what you're saying is that 240 series ABS never got OBD-I capability and thus never used port #3 on the diagnostic connector. I certainly knew that was true up until at least 1991, as in my posts elsewhere here. The 700 series started out the exact same way in 1989 when ABS was first offered on select models, exact same system, no OBD-I. Both systems used the transient surge protector (aka. spike eliminator), which was clipped under the passenger seat near the ABS controller in later 240 models (in 700/900 models these lived under the dash on the driver side). The Volvo wiring diagram for the 92-93 240 that you kindly provided in your other post in this thread clearly indicates that (see also below). Some of the posts I've seen here and in other 240 forums were incorrect or misleading about changes and OBD-I capability. ABS systems didn't change for 240s until 1992 where basically just the controller moved under the passenger seat. Based on other posts, that may or may not have been a mid-model year change. When North American 240 assembly production moved from Halifax back to European plants for 1992 as the model series drew to a close then that might lend credence to what people find in their 1992 cars.
Looking more closely at the wiring diagrams you provided for the early ABS system (matches my 1989 740 manual that uses the same controller as you'll see below), the ABS warning light on the dash was raised off a ground provided by pin 29 of the ABS control module or various subtle faults to ground through the ABS unit or through pin 32 on the ABS controller (which sees missing or faulty signals from the sensors). There would be no diagnostic code to figure out the fault. You had to resort to fault tracing with a meter, as is indicated in the service manuals. My hopes for the OP being able to easily diagnose the errant sensor are now lost.
On further investigation using the North American Volvo dealer parts chain listings, the early ABS control module p/n 3523142, without OBD-I capability and needing the surge protector, was used in all RWD models up until 1993 (select trim levels only, standard equipment only 1992-on):
Volvo 240 1988-1993 (last model year)
Volvo 740 1988-1992 (last model year)
Volvo 760 2.3l Fuel Injected Turbo 1988-1990 (last model year)
Volvo 760 2.8l Fuel Injected 1988-1990 (last model year)
Volvo 780 1989-1990 (last model year)
Volvo 780 2.3l Fuel Injected Turbo 1991
Volvo 780 2.8l Fuel Injected 1987-1988 (last model year)
Volvo 940 1991-1993
Volvo 940 SE 2.3l Fuel Injected Turbo 1991-1992
Volvo 960 1992
Volvo 960 3.0l 6 cylinder Fuel Injected 1993
The later control module p/n 9128853, with OBD-I capability, was used only in the later 940 (other models were now out of production, all carrry theorugh to their last model year):
Volvo 940 1991-1995
Volvo 940 SE 2.3l Fuel Injected Turbo 1991-1992
Volvo 960 1992
Volvo 960 3.0l 6 cylinder Fuel Injected 1993-1997
Volvo S90 3.0l 6 cylinder Fuel Injected 1997-1998
Volvo V90 3.0l 6 cylinder Fuel Injected 1997-1998
In the 900 series, 1991-1993 were clearly the changeover years, likely depoendent on market area and assembly plant. There is one other changeover I'm aware of and that's the front spped sensor. In the first ASBS systems a diamond tipped sensor was found to be overly sensitive, it also had a tendency to chip on the diamond tips. There was a Volvo TSB on this for the later square tipped sensor that was a direct replacemnt and less sensitive.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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