db2 swap in 94 6.5 td
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Joined: Aug 2012
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From: Rochester, MN
db2 swap in 94 6.5 td
I have a 94 3500 crewcab 2wd 4L80E 6.5 turbo manual waste gate, lift pump on seprate fuse & swicth, 80s db2 IP.
My Question is How to find the wires for the Throttle Position Sensor
I think I need 5volts to the gray wire, ground for black, a return wire for the blue
I opend the wire harness and found three gray wires with 5volts, 3 dark blue, 4 black.
How do I find my return wire
---AutoMerged DoublePost---
I just read the 94 db4 has 3 signles from the IP to the ecm. So Is there a way to make 3 signles from 1?
I'm only making this complicated because I can.
My Question is How to find the wires for the Throttle Position Sensor
I think I need 5volts to the gray wire, ground for black, a return wire for the blue
I opend the wire harness and found three gray wires with 5volts, 3 dark blue, 4 black.
How do I find my return wire
---AutoMerged DoublePost---
I just read the 94 db4 has 3 signles from the IP to the ecm. So Is there a way to make 3 signles from 1?
I'm only making this complicated because I can.
Last edited by dieselant; Aug 21, 2012 at 01:48 PM. Reason: Automerged Doublepost
Diesel Fan
Joined: Mar 2012
Posts: 37
Likes: 0
From: Homosassa
Well I am currently going through the same dilemma. What ha-d happened was... i realized how common it is for people to jump to this mechanical injector pump "fix" in my area, run into this problem then sell the truck/ engine to someone like me 
Bobbie Martin is the man you need to follow with this issue or you will run into a bunch of problems. The fly by wire db4 sends several signals to the PCM to control the transmission, one from a fuel shutoff switch and one from a TPS. for me the issue is mocking the fuel shutoff switch, but i digress. You will eventually need to address you PCM(ECM) and add a transmission control module from a 6.5 that had a 4l80e transmission or purchase a stand alone TCM to shift correctly. Like I said Bobbie Martin has paved the way and made this modification and followed it all the way through. The truck I bought was partially modified for a mechanical fuel pump, ran but like **** and not all the gears. The motor I got for my truck later, has the DB2 injector pump but the rest of the wires are not present. So i plan on doing this correctly per Mr Martin's design.
Bobbie Martin is the man you need to follow with this issue or you will run into a bunch of problems. The fly by wire db4 sends several signals to the PCM to control the transmission, one from a fuel shutoff switch and one from a TPS. for me the issue is mocking the fuel shutoff switch, but i digress. You will eventually need to address you PCM(ECM) and add a transmission control module from a 6.5 that had a 4l80e transmission or purchase a stand alone TCM to shift correctly. Like I said Bobbie Martin has paved the way and made this modification and followed it all the way through. The truck I bought was partially modified for a mechanical fuel pump, ran but like **** and not all the gears. The motor I got for my truck later, has the DB2 injector pump but the rest of the wires are not present. So i plan on doing this correctly per Mr Martin's design.
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