a442 control module signals diesel swap. (2 Viewers)

[TheBussman]

attempting to use a 1993 gas auto trans module in a diesel swap I've been searching for a module from a diesel truck but no luck so far.

So far I've got the TPS signal (va) circuit working using a voltage converter to send 5v to the TPS. there are several other circuits that are disconnected because the gas ECU is gone. the truck drives and shifts perfectly for about 10min. Then the OD light starts flashing and shifts at very high RPM. Code is 86 (if i remember right) "engine rpm signal" this relates to the NEO circuit. manual states that the neo circuit is a 5v pulse signal that's needed for the idle speed... the injection pump inductive sensor only puts out 0.5v as checked with a scope, it does not satisfy the auto module as expected. does anybody happen to have more information on what this signal is? i'm surprised that it says its "idle rpm" and not just rpm.

dakota digital converter does not work unless I modify my alternator i don't know if its going to output the signal the tcu wants.

Compushift, other standalone is available but expensive, They make you buy a great big harness, new gear selector sensor etc, all i need is the one connector that connects to their module but they don't sell that separately. I'm not sure if there is going to be any real benefit using compushift... might be cool to adjust for a sooner lockup but i'm not sure. might be a great big hassle to tune too. Is there anybody using compushift with a a442 and has feedback?

other ideas? controllers to use?

 

[TheBussman]

Yeah, the stock tcu works fine standalone. Iirc it just needs temp and tps analog signals

I'm quoting from this thread: Haltech Control of the A442f

@PIP

sounds like you've been here before? are you talking about a stock diesel or gas TCU?
I did not hook up either temp signal circuit. From reading the FSM it sounds like ect1 was the "engine cold don't shift into OD" signal and ect2 was the "engine overheating fail-safe mode" signal. but as of now the temp signal doesn't seam to be an issue based on the code.
your cummins airbox would prob fit my build nicely too.

 

[PIP]

I'm quoting from this thread: Haltech Control of the A442f

@PIP

sounds like you've been here before? are you talking about a stock diesel or gas TCU?
I did not hook up either temp signal circuit. From reading the FSM it sounds like ect1 was the "engine cold don't shift into OD" signal and ect2 was the "engine overheating fail-safe mode" signal. but as of now the temp signal doesn't seam to be an issue based on the code.
your cummins airbox would prob fit my build nicely too.

I tried the 1fz ecu behind a Cummins. Shift scheduling was not good and couldn't make it work decent.

I worked with Mike to develop the Compushift 442 and 343 controllers. Mike never got them working right, we had a disagreement and I have not used their products since.

I recommend megasquirt mini for controlling a 442 or 343. Performs way better than compushift and uses Tuner Studio software which is much better than the compushift pendent thing with its very limited control.

I've had megasquirts in 80 series going on 10 years with zero issues. I daily drive one with a megasquirt shifted 343.

 

[TheBussman]

I tried the 1fz ecu behind a Cummins. Shift scheduling was not good and couldn't make it work decent.

I worked with Mike to develop the Compushift 442 and 343 controllers. Mike never got them working right, we had a disagreement and I have not used their products since.

I recommend megasquirt mini for controlling a 442 or 343. Performs way better than compushift and uses Tuner Studio software which is much better than the compushift pendent thing with its very limited control.

I've had megasquirts in 80 series going on 10 years with zero issues. I daily drive one with a megasquirt shifted 343.

thanks, even though the stock one wasn't shifting right behind a cummins you got it to run without error codes? if so what were you feeding the "neo" circuit with?

Interested in the megasquirt, everybody I know that's tried one for engine control likes it although I'm a little afraid I'm going to be tuning it forever. The microsqurt wouldn't be up to the task?

 

[PIP]

thanks, even though the stock one wasn't shifting right behind a cummins you got it to run without error codes? if so what were you feeding the "neo" circuit with?

Interested in the megasquirt, everybody I know that's tried one for engine control likes it although I'm a little afraid I'm going to be tuning it forever. The microsqurt wouldn't be up to the task?

We're going back 15+ years here. Knowing how I think and what I was trying to do back then I'm fairly certain I left the 1FZ ECU in place and fed a tach signal into the distributor wiring. So whatever wiring was there between the ECU and trans controller was intact. My goal was to de-linearize the TPS movement from the throttle. Kinda like the opposite of those TPS response increaser things they sell for new diesel pickups. But it's just way too complex for that and I proved it to myself.

Yes, the microsquirt. That's what I meant by the Megasquirt mini, sorry.

I don't know what to say about the tuning part. My advise is get over it lol. Actually get into the stuff and do your best to learn what all the settings do and make incremental changes.

You should have it drivable in a few laps around town and you should have dialed to perfection within 500 miles.