Autosport Labs

Has anyone attempted to use the Megajolt Lite Jr. on the Ford 2.3L engine and using the stock crank trigger, (2) coils for 2 plugs per cyl., and the stock EDIS controller (without computer of course)?

I have ordered the Megajolt Lite JR. a few days ago with the throttle position sensor option. Does the unit come with a TPS or is there a TPS that is recommended?

Any help would be appreciated!

Thanks in advance!
Charles Judy
Supercharger Technologies
www.superchargertech.com
supercharger@excite.com

Hi Charles,

No TPS is included- that's a highly specific part for an engine. However, if it's a modern engine previously equipped with EFI it should have one already. Check the 'information library' link above for the V3 controller and review the installation diagram.

Thanks,
Brent

Brent,

My engine did come with one but I assume that every engine that has a TPS uses a different resistance (ohms) range. The Ford TPS that came with the Ford 2.3L engine has 3 pins:

Pins:--------------- Idle-------------- Full Throttle
Pin 1 to Pin 2---- 3.6K ohms --------- .6K ohms
Pin 2 to Pin 3---- .9K ohms -----------3.7K ohms
Pin 1 to Pin 3---- 3.5K ohms ---------3.5K ohms

How do I calibrate the MJLJ to work with this TPS? What pins?

PS - I just received the unit. Your wife took care of the problem
with the check (it was made out to MJLJ - not to Brent Picasso).
Tell her "Thank You" for taking care of me and shipping the unit
overnight as requested!

Charles Judy
Supercharger Technologies
www.SuperchargerTech.com
352-542-0147 Fax: 9468
Old Town, FL
supercharger@excite.com

Brent,

This engine also has a Ford DIS module (not the EDIS-4).
From 1995 - 1996 Ford Ranger I believe.
This is the 4 cyl. / 2 plugs per cyl./ 2 coil packs.
It is 12 pin and has mostly the same connections (6 pin connectors
on each end). The pins are as follows:

------DIS pins-------------------Proposed conections----------
1---System Voltage---------------+12 Volt (regulated)
2---Cylinder ID------------------From Crank Trigger
3---PIP out----------------------To MJLJ?????
4---PIP in-----------------------From Crank Trigger
5---Spout------------------------From MJLJ???
6---Dual plug inhibit------------To ECU (not used)
7---Ignition Ground--------------Crank Trigger Ground
8---Coil 3-----------------------To Coil Packs
9---Coil 4-----------------------To Coil Packs
10--Coil 2-----------------------To Coil Packs
11--Coil 1-----------------------To Coil Packs
12--IDM--------------------------To ECU (not used)

Does this look correct? Has anyone else used the DIS insted
of the EDIS-4? Please answer the last two postings ASAP as I
am ready to drive this thing!

Thanks,
Charles Judy


Supercharger Technologies
www.SuperchargerTech.com
352-542-0147 Fax: 9468
Old Town, FL

Charles,

Each TPS unit might have different pinouts, so I'm not familiar with the Ford unit you have.

First, refer to the diagram:
http://picasso.org/mjlj/?q=node/606

The TPS is essentially a variable resistor connected to the throttle shaft. One end is grounded, the other end is fed the 5V VREF signal from the MJLJ, and the other connector is the 'sense' which generates the variable signal based on the throttle position. This voltage will vary somewhere between 0 and +5V.

According to your analysis above, it *appears* that your connection should be:

Pin 2: TPS sense
Pin 3: ground
Pin 1: +5V VREF

i.e. at idle, there is minimum resistance between pin 2 and 3. If 3 is tied to ground, then this will register as "low" load in the MJLJ. Correspondingly, if the throttle is wide open, and pin 1 is +5V, you have minimal resistance between pins 1 and 2, registering as "high" load in the MJLJ.

Wired up this way, you should be able to see the runtime screen change between low and high load.

Currently, there is no 'calibration' per se. That is scheduled for a firmware enhancement. You will need to manually calibrate the load values to match the range between idle and WOT.

Hope this helps!
Brent

Definately use the EDIS-4 module- I don't believe the DIS ignition is compatible with the EDIS communication protocol.

Brent

Unless someone has swapped out the wiring harness and PCM, a '95+ Ranger will be EDIS, not DIS. '94 was the last year for DIS, and as correctly indicated, it operates very differently from EDIS. The coil packs are the same, but that's about it.

I'm not sure if it matters at all for the MJLJ, but the Ranger is somewhat unique in that the EDIS-4 logic is built into the PCM. AFAIK, all other EDIS-4 applications use the external module.




Brad

And the answer to the TPS question?
(On my forum posting)

Charles


Supercharger Technologies
www.SuperchargerTech.com
352-542-0147 Fax: 9468
Old Town, FL

Forget the question...already answered!

Supercharger Technologies
www.SuperchargerTech.com
352-542-0147 Fax: 9468
Old Town, FL