Clyde

LOL yes I know what ya mean. Let us know if ya ever get round to it. take care Any ideas On what I am up against???

So. Reconnected the ECM and the MAP sensor. i followed your step 1 and I had continuity to the battery ground from the MAP sensor ground. I then followed your step 2. Inserted two pins in the MAP sensor plug. One pin on the Sensor signal wire and the other on the sensor ground circuit. started the truck and had .972 DC volts. Reved the truck to 1500 RPM and watched the voltage meter go up to 1.207 ish volts. Cleared the Codes and road tested and it still set the 237 and the 112 code. Still in limp mode. No power Ect PS I put some dielectric grease on the ECM plug and MAP sensor plugs. what do you think??? BTW Dripley did you ever change out that MAP sensor for the cheap ones we found???

So step # 2 check sensor signal under RPM and load. yours stayed at 2 volts. Does this 2 volts mean all is good with the sensor.(where it should be) I will be doing this in the morning. If both these checks are good ; Is the ECM fubared??? I will let you know what I find

Thank you

I did do the continuity on the ground and the signal wire. Both circuits showed me continuity . .004 and .007. Also I have the 5 volts to the sensor. On step 3 when I read the signal voltage with the engine off and The key on ,I got .02 volts. Step 4 says do turbo charger test. i don’t know how to do this. but I do know what it sounds like if I have a boot off. i also checked the impeller on the turbo. No mechanical looseness and spins freely. what do you think before I bring it to someone and it costs me a pile of cash??? Is the signal generated by the sensor??? by taking the supplied 5volts and changing it by the pressure it receives??? Does this mean the sensor is bad??? Or the ECM is bad??? i have other sensors I can try OR go straight to the ECM???

Hey guys I finally started probing tonight and I have some questions. In the MAP testing procedure, step# 6. I turned off key and disconnected ECM wiring harness. Should I test pin 2 grey/red with the ignition on or off??? i tested with it off and got OL no ohms. The Same thing With step# 7. i tested with the Ignition off. tested between pin 2 & 3. again I got OL on my meter. So if this is right I have to repair the shorts in my wiring???? Is it easier to run new wiring for the ground and signal wire to the ECM???? OR to go searching for the short in the harness??? I do have the 5 volts at the orange wire. Any advise Would be appreciated

Thank you

Thanks everyone for the excellent suggestions. When I check the 5volt wire(orange) I believe, put the meter on DC voltage; the meter positive (Red) goes to the Orange wire and the meter Negetive (black) goes to the battery ground???? Would this be correct? How do I check the ground circuit ? Put the meter on ohms setting? Red meter probe on the ground wire at the plug? Black meter probe on the battery negitive? I am not sure how to do this? Could you confirm my ideas if they are correct or let me know what I am doing wrong. thanks for any input

Right on thanks

So I received all my new sensors and installed them. The IAT and the MAP from Friday parts. The map sensor DID NEED the wiring adaptor. So this did nothing for the limp mode and the truck is still throwing the 237 and 112 codes. i did buy a scan tool but I am no electronic wizard. Do you have any advise??? Maybe a step by step approach to identify the problem that is causing the codes. I can let you know what I think 1-check all grounds, remove clean and tighten 2-remove ECM plug and check for moisture ,corrosion or contamination. 3- Check all other plugs for the same. 4- Check continuity between the sensor plug ins and the ECM. 5- measure voltage at the IAT and MAP sensor while the engine is running?????(Not sure how to do this??? I don’t have access to the dealer scan tool drb3 I only have my obd2 Money is tight and I have plenty of time on my hands. Any advise would help

Thanks Guys for your help

Could I pick your brain? i was wondering if I am hurting the Cummins driving it with a bad MAP and IAT sensor??? the parts are on order but the wife needs something to drive around town. It doesn’t have much power but it runs good

I looks like that new MAP sensor will need that adaptor cord. see photos. just waiting on parts now. I will update you once all the new stuff is in.

From the photo this map has more square pins in it. where mine now has more spade shaped pins also this map has that funky shape around the pins a point on each side of the pins. mine has an oval shape. ???? IDK that’s the way it looks to me. I am going to pull the plug off the MAP in the truck and double check you know this has the Cummins # stamped on the side of it i will let you know what i find

Friday parts . Com p/n-4921505 that’s their and Cummins P/N and the dealer / Chrysler sells the adaptor for around 75$ Check it out and let me know what you think. I just goes to show you how much people mark things up