Builds another cummins swap thread/build thread (1 Viewer)

[Jvoight]

So I was trying to figure out the reverse lights and I found that if I ground the reverse switch on the trans controller, where the black test lead is, it powers the reverse light output and I can hear a relay click and my R dash light and reverse lights come on. The reverse output is the kinked red wire all by itself on the right connector.
So does anyone know why it's not working? Why is the reverse not closing the switch?

I still haven't taken the time to figure out why mine don't work either... Seems like they should... I also need to investigate my tach as well... Has never worked and it also should... If I figure anything out I'll post

 

[gdctaco]

Ya my tach worked for the first week and quit. They have the pin out drawings at compushifts website.

 

[gdctaco]

would I have to chase down that ground on the other side of the "combination meter" whatever that is? Seems like to me that is what's missing and what I did when I grounded that lead and caused the circuit to complete.

 

[JuliosLX450]

Test the ground. Sounds like that's your issue.
You might have to bypass it.

 

[hotwod]

Here's a question out of left field, why do we eliminate the Yota fuel pump? Why not use it as a prime/lift/auxiliary supply?

 

[Dirty Koala]

Here's a question out of left field, why do we eliminate the Yota fuel pump? Why not use it as a prime/lift/auxiliary supply?

The 6BT never had a lift pump in the tank on the dodges. Keeping the toyota pump introduces a restriction that really doesn't need to be there. The mechanical lift pump on the side of the block does a good job of feeding the injection pump.

It's really one of the easiest parts of the swap, pop open the hatch, pull the pump, stick in a stainless pickup tube, put it back in the tank.

 

[hotwod]

Oh I know it's easy to remove... but why would an extra pump feeding the lift pump be a restriction? Anyone know the flow rate difference between the two? Obviously if the yota pump is less then the Cummins lift pump you'd want to remove it... but if it's not. What's the harm?

 

[Dirty Koala]

There also maybe an issue with supplying too much fuel pressure. I can't think of any pros to leaving it in.

 

[bryson]

One more potential failure point too I think... If the stock pump does fail (I understand they're fairly reliable, but I have had one go bad on me) you're SOL - fuel won't free flow through an inoperable stock pump. Leaving the stock pump just adds unnecessary mechanical complexity to the fuel system.

 

[hotwod]

I just know we have more then a few machines here with "charge" pumps in their system. Seems like they work well. Specifically Terex Cranes that have them running with a Cummins engine. Just a thought. I'm going to put a guage on my P-pump and see what type of pressure I get with and without. Also make sure the tank pumps not running more then what it should for pressure in the system

 

[hotwod]

 

[gdctaco]

hahahahahahaha

 

[gdctaco]

cut the cover at the bottom of the pic, you can see the tiny screw

attach a ring terminal and some wire to run to the dakota digital

output signal to engine harness top 1 pin of the compushift

and the tach works on the display

 

[gdctaco]

I cant get the tach in the dash working, it might be dead, could be Dustin's wiring, I'm giving up on it. Too many things to do

 

[Jvoight]

Bummer... That is current state of mine as well... I may give it another go here pretty soon and will share if I find the culprit...

 

[gdctaco]

I think if you can find that wire going to the tach and input the signal from the dakota, it might work but I cant find that connector 'E12'

 

[cjmoon]

That e12 is a solder connection junction I the harness you could back feed it I through Ih1 terminal 5 if dustin left that connector in the there one in one of the original ecu connectors also but my guess is those are long gone.

 

[gdctaco]

He did leave the connectors and spliced into them. Can you find out what the connector looks like and how to read the pins, its hard to make out wire colours cause he snipped them right at the plastic.

 

[cjmoon]

I might be leading down the wrong path my knowledge is on obd2 trucks. I don't know what is different on the earlier trucks. Sorry

If you have a wWD for your truck look at multiple pages for trans, combination meter, ecu. See where the tach reference shows up. I'd bet it similer to mine but just don't know. The land cruiser seems to use old school gauge theory per say and stuff I found that related to the 80's for runners apears to be the same. Squart wave signal drives the tach.

 

[gdctaco]