wiring issues on MAP and APPS + others

[johnstangl]

after doing a head gasket job on my 1999 24v cummins i started my truck back up after getting everything back together, and i noticed there was a check engine light but didn’t think much of it. once i drove it i realized i had absolutely NO power and no throttle response after 1200 rpms. if i kept the pedal all the way down it would slowly get up to 2000rpms so that my auto trans would finally shift. after getting on a back road and giving her WOT i was able to get up to speed but it was a dog. i had no problems with my VP44 before hand. also, when we had the code reader plugged in while driving it said i was only giving 40% throttle while i had it WOT. i have zero boost pressure according to my gauge but i know my turbo and all seals are fine.

 

i was told i need to check voltage and continuity for these sensors but i have no experience with this kind of stuff, if someone could walk me through it step by step it would be greatly appreciated. i have a DVOM so i believe i have what i need to check it. i will try to link a video of my problem. 

 

video:

https://youtu.be/mFmEO8JbI9A

 

here are a list of my codes:

P0237 - turbocharger/supercharger boost sensor A circuit low 

P0122 - throttle/pedal position sensor/ switch A circuit low 

P0118 - engine coolant temperature sensor 1 circuit high 

P0113 - intake air temperature sensor 1 circuit high

P1689 - no description

it should be noted that it has no problem reving up  while in park or neutral, so that makes me think the vp44 along with my other fuel components aren’t the issue. i have an airdog II4G, and an edge EZ tune. i also changed out my factory 180 thermostat to a genuine cummins 190 thermostat. 

 

 

[johnstangl]

1 hour ago, johnstangl said:

after doing a head gasket job on my 1999 24v cummins i started my truck back up after getting everything back together, and i noticed there was a check engine light but didn’t think much of it. once i drove it i realized i had absolutely NO power and no throttle response after 1200 rpms. if i kept the pedal all the way down it would slowly get up to 2000rpms so that my auto trans would finally shift. after getting on a back road and giving her WOT i was able to get up to speed but it was a dog. i had no problems with my VP44 before hand. also, when we had the code reader plugged in while driving it said i was only giving 40% throttle while i had it WOT. i have zero boost pressure according to my gauge but i know my turbo and all seals are fine.

 

i was told i need to check voltage and continuity for these sensors but i have no experience with this kind of stuff, if someone could walk me through it step by step it would be greatly appreciated. i have a DVOM so i believe i have what i need to check it. i will try to link a video of my problem. 

 

video:

 

 

here are a list of my codes:

P0237 - turbocharger/supercharger boost sensor A circuit low 

P0122 - throttle/pedal position sensor/ switch A circuit low 

P0118 - engine coolant temperature sensor 1 circuit high 

P0113 - intake air temperature sensor 1 circuit high

P1689 - no description

it should be noted that it has no problem reving up  while in park or neutral, so that makes me think the vp44 along with my other fuel components aren’t the issue. i have an airdog II4G, and an edge EZ tune. i also changed out my factory 180 thermostat to a genuine cummins 190 thermostat. 

meant to put this on powertrain, my bad new guy move

 

[dripley]

If you look in the articles section, 2nd gen 24v, engine, obd error codes there is a complete list of the codes and diagnostics. The 1689 is no comunication between the ECM and VP44.

 

I went thru this same scenario a couple times and both times it was a failed MAP sensor, but I only had the 237 code and not the others you have. I could build abour 3 psi of boost that showed on my mechanical gauge while my scan gauge 2 showed 0 reading from the map sensor. Is there chance that the key got turned while some the connectors were disconnected. I would clear the codes and drive the truck and see what comes back.

[johnstangl]

12 minutes ago, dripley said:

If you look in the articles section, 2nd gen 24v, engine, obd error codes there is a complete list of the codes and diagnostics. The 1689 is no comunication between the ECM and VP44.

 

I went thru this same scenario a couple times and both times it was a failed MAP sensor, but I only had the 237 code and not the others you have. I could build abour 3 psi of boost that showed on my mechanical gauge while my scan gauge 2 showed 0 reading from the map sensor. Is there chance that the key got turned while some the connectors were disconnected. I would clear the codes and drive the truck and see what comes back.

i don’t understand how wiring works so this whole thing is intimidating? and it is possible that has happened but i’m not sure if it actually did happen. if they key got turned on while they were disconnected what would that mean? is slo tried clearing the codes and that didn’t help :/

Edited July 18, 2020 by johnstangl

[dripley]

If things are disconnected and you turn the key on it will set codes for what ever is loose. Did you have the batteries disconnected while doing the head gasket?

I would also add that I am electrically challenged myself and depend on other members to lend when needed.