Auto to Manual Swap - Electronics & Wiring

[button_pusher]

Finishing up the mechanical bits of my 2007 auto to manual swap, and now focusing on the electrical. I thought this would be a little more straightforward than it is, basically no one is willing to touch the PCM. What have you guys done? Right now it just throws the solenoid and TC codes, and puts it into limp mode at around 3k rpm, from what I know having it wired to see "park" all the time is also going to cause issues with carbon buildup over time with the different fuel map for idle/park vs drive.

I've been trying to buy a manual PCM (if anyone with a 2007 4.0 five speed wants to bless me with their VIN I would be eternally thankful), but it also seems a lot of people change the whole wiring harness - is that really necessary? Trying to avoid that at all costs, especially with PATs.

Any thoughts or guidance would be appreciated!

 

[SenorNoob]

Would it be possible to wire it so it thinks it's in drive all the time? I've heard of people using resistors to make the PCM think the shift solenoids are still there. I have no idea if it also monitors line pressure or something by that year...

 

[Roert42]

I wired the gear position sensor to the clutch pedal switch. When the pedal is out, it’s in drive, when it’s depressed, it’s in neutral. This gets past the starting/ 3000rpm limit.


I wired resistors to the wiring for the shift solenoids to get rid of the codes for those.

The code I have left is for the turbine speed sensor.

I may try and wire the tss wiring to the oss and see if that helps.


The other main issue I have is that with the oss wired into harness the speed is about 40% high. The only way I can think to fix this (without changing the tone wheel) is to reprogram the ecu.

 

[button_pusher]

I wired the gear position sensor to the clutch pedal switch. When the pedal is out, it’s in drive, when it’s depressed, it’s in neutral. This gets past the starting/ 3000rpm limit.


I wired resistors to the wiring for the shift solenoids to get rid of the codes for those.

The code I have left is for the turbine speed sensor.

I may try and wire the tss wiring to the oss and see if that helps.


The other main issue I have is that with the oss wired into harness the speed is about 40% high. The only way I can think to fix this (without changing the tone wheel) is to reprogram the ecu.

Woah! that's a great idea. Do you have any diagram for the resistor wiring? I already junked the auto so I cant play around with a multimeter.

I actually saw one guy use a Dakota Digital SGI-100BT, cost $130 bucks:

Credit to RonD on Ranger Forums!

"These allow you to convert Ford Speed Signals up or down

Since it's a 4x4 I would see if you can use it between the OSS and computer, i.e. change the manual transmission OSS PPM (pulse per mile) output to Automatic PPM output, that way computer will speed correct in 4 low.

Worst case is you can use it with the OSS directly to speedo/odo and cruise, that's it's normal configuration."

 

[Roert42]

I took the wiring harness out of the auto and measured the resistance on all connections.

I have a wiring diagram, I just need to find it and I can send you a picture.

I’ll need to look into that Dakota Digital tac converter. @RonD suggested