yohon

Well good news bad news. Map sensor is fixed and finally wired correctly! Thank you tractorman! Bad news is I think the ecm is toast. Voltage across every sensor is fluctuating and crashing out. I checked the common power and grounds at ecm and it was solid. But thank you everyone for you help!

That helps so much thank you!

It does have an aftermarket lift pump on it and uses a relay. Good idea on checking that. Tractorman I know your an 02 not an 01 but any way you can tell me what order your map sensor wires go? Should be an orange Grey red and blue black wire.

Well I still haven't figured out the MAP sensor wiring yet. But got the scan tool to read a few more variables and it shows ECM battery voltage tanking whenever the truck cuts out. So I'm guessing this is showing either a bad ecu ground or bad 12v supply?

Does any one know how to tell what pin is what on the map sensor? I have the diagram but can't tell what each pin is on the plug. The truck is reading 28 psi of boost at idle so I think the 5v circuit is wired to the wrong pin shorting the circuit. Did finally get the truck to start the neutral safety switch is wired to a switch up under the dash. Something else to add to the fix list.

Finally got a chance to crack into this thing. Wiring looks like a mess (never buy a vehicle at night ) I'm guessing rodents got into it at some point map sensor pig tail is new but connected with wire nuts lift pump wiring had 3 butt splices in it ground wire was hooked on the alternator just a real mess. Thank yall for the help

Great thank you I'll post what I can find!

Starting this thread to help troubleshoot and document a host of problems with my father's "new" truck a 2001 24v 3500 dually with a 6 speed. Problems Truck will start and idle fine but will surge/buck inconsistently with throttle/load Codes p 1475 p0522 p0122 p 1295 p 0237 p 1488 and the companion code. Alternator ac noise seamed good <.03 No wait to start light but truck has a grid heater delete block on it not shure if it was installed "correctly" Probably is ecu but I'm going to check out the 5v system just to check. I did notice temp sensor was spliced thinking wires might be swapped? Grounding out the circuit Truck seamed to behave better when warmed up. Questions! Does the wait to start light still light up momentarily without grid heaters? Also lift pump cycled for a shorter time then my truck does (2000 vs 2001) both pumps are aftermarket airdog pumps. Can ecus be repaired/rebuilt? Any new ones on the market? Are ecus truck specific? I can't swap a 2000 auto with a 2001 manual? Thank yall for reading!

Think I got it solved checked all wiring and found the connector was full of atf from the original failed sensor. Cleaned it out and can't seem to get it to act up. Also had a failed (missing) 0 ring on my 1-2 shift accumulator piston causing some leakage internally. I officially broke the transgo customer service. Over 90 emails back and foward and dropped the pan 5 times. They were very helpful but we officially determined I need to just go 6 turns on the pr valve instead of the normal max of 4 to get me to the 150-range for line pressure.

Does anyone know of a more unlikely cause for a p0720 code to pop? I've changed out the output shaft speed sensor (factory one had a pretty obvious failure) but now I'm wondering if something else in the transmission can be causing it.

Thank you for that! I've only recently been reading up on @dynamics work. Wish I had found it before I put this shift kit in. But those numbers give me something to aim for. Where your transmission is making pressure is much diffrent then mine. My highest pressure is at WOT 4th gear 150. WOT 1st gear is about 120.

First atf change on my rebuild transmission and I figured I'd throw in a transgo shift kit in it while I was in it. I really wish I took readings of pressures before I tore into it. Now I'm looking at 90 psi at 1200 rpm dead stop and 120 psi with the tv valve all the way foward at 1200 rpm. I've done a bunch of reading on this site and read some great guides. But I cant find someone with the same problem I'm having. According to transgo I should be seeing closer to 120 -155. Only other mods to the transmission was a single disc billet torque converter and a upgraded 2nd gear strut and anchor. Am I ok to run at these pressures? Is my pump going out? Or do I need to upgrade the accumulator piston and governor solenoid? (Seing 150 psi at WOT in od ) thank yall in advance. FYI amazon sells a 47re transmission pan with a drain plug for 27$ if your like me and too broke for the fancy billet aluminum ones.