Engine/Transmission (1998.5 - 2002) Possible to bypass MAP sensor?

[FDavid]

Truck was acting a little sluggish lately so I decided to remove and clean the MAP sensor. Well I end up breaking the sensor and now the truck is super slow. I had to use low range just to get up the hill by my living quarters. Anyway to bypass the MAP sensor and get my boost back until I can get a new one?



Some of you may ask why I don't just run down the street and get a new one. Well the answer is the truck and I are currently in Jordan working on a project about 20 miles north east of the Dead Sea and there is only 1 Cummins dealer in the entire country. The say ETA on the sensors is about a month. Wonder if Geno's can express ship me one:-laf



Here is a picture with Israel in the background



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[cerberusiam]

You should be able to cross feed the wires before the connection with a resistor to get it to read a high MAP reading all the time. As long as the ECU does not thro wfits about voltage too high too long that will work.



What resistor works and if you can get one where you are at is the question. Do a search on the 3rd gen forum for Smoke Switch and you should be able to find a reference to the resistor specs needed.



Call Genos and see if they can expedite shipping also. Good luck.

 

[FDavid]

^ I would consider that but out of frustrations I threw it on the ground and stomped on it. However, made some rounds on the phone and found one in Saudi Arabia, they are ship it out tomorrow w/overnight delivery. Cost 89 bucks, can't complain

 

[Ram4Sam]

"^ I would consider that but out of frustrations I threw it on the ground and stomped on it. "



This remark gave me a smile as I have used this repair technique many times.



Good luck!



Sam

 

[cerberusiam]

^ I would consider that but out of frustrations I threw it on the ground and stomped on it.

LMAO! :-laf:-laf





Thats one repair technique I guess. Actually if you jump the wires you dont need to hook it to the sensor but the hole it came of it needs to be plugged. Tends to loose boost if you don't.

 

[FDavid]

LMAO! :-laf:-laf





Thats one repair technique I guess. Actually if you jump the wires you dont need to hook it to the sensor but the hole it came of it needs to be plugged. Tends to loose boost if you don't.

Can you elaborate a little more plz? If I jump the wires on the connector I will get some power back til the new map sensor arrives??

 

[cerberusiam]

Can you elaborate a little more plz? If I jump the wires on the connector I will get some power back til the new map sensor arrives??

You should, a smoke switch just bypasses the MAP to tell the ECU boost up and fuel accordingly. The power supply is 5 volts, the output is something like . 5 to 4. 9 volts to measure boost. If you put a resistor between the 5 volt supplu and crossed to the ECU sense wire so it saw a constant say 3. 5 volts the ECU won't know its not correct and will fuel accordingly. The same could be done for the IAT if you knew the values.



The 3rd gens had a habit of going into limp mode if it saw the voltage too high for too long as it monitors the circuit for rationality. I have no idea if a 2nd gen does the same thing. I don't *THINK* the ECU is smart enough for that function but thats just a guess that needs verified.



Searching for Smoke Switch on different forums may yield some interesting reading and possibly the correct resistor and setup values to do it.

 

[mickeyblueyes]

Just wondering

Good luck with your repair, and what is the cost of diesel fuel at your local filling station? US /Imperial?

 

[FDavid]

It averages between $2. 00 and $2. 25 per gallon. Nice thing is prices are gov't controlled so every gas station has the same price, no need to hassle shopping around. Another plus is the diesel here is at 10,000 ppm of sulfur, highest in the world.



And Mr. Cerberusiam, thanks for the excellent reply, if I hadn't found a sensor so soon I would be melting and fusing wires right now.

 

[WestTN]

The best solution by far is to replace the sensor with a new one. Manifold Absolute Pressure varies with load and speed, so there is no one setting that will allow fueling to be correct.

 

[FDavid]

Okay if I understand this correctly, the plug that goes into the Map sensor has 2 wires. One feeding 5 volts and the other returning whatever voltage the Map sensor tells it to the ECM?



With the plug un-plugged, no/low voltage is being returned, thus the p0237 low voltage code and the reason my truck is so slow.



So what if I were to connect the plug wires together, feeding 5 volts right back to the ECM? I assume the truck would run like a beast unless the ECM is smart enough to detect something like an overboost code and defuel the VP again. Anyone think I can harm the ECM like this? Food for thought anyone?



Don't mind my crappy drawing

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[cerberusiam]

Thats correct, but, you need a resistor between the wires to drop the voltage because if its too high the ECU just goes into limp mode thinking there is a problem. Probably.



I would not run 5 volts back to it just because am not sure the effect on that circuit.