Engine/Transmission (1998.5 - 2002) Map sensor reading to high of a pressure

[Silver Bullet Ram]

I had it checked today, it was reading to high of a pressure, not voltage, but pressure. I changed the map sensor a couple of weeks ago. Any clues? What voltage should i be seeing on one of these, resistance? Thanks in advance.



Gary

 

[kdunham]

Gary-What is "too high of a pressure"? Generally it will set an overboost code if that happens,like your wastegate on the turbo isn't working. Did your mechanic give you a number?

 

[Silver Bullet Ram]

it was a around 50 at idle, this guys truck was at 30 at idle.

 

[Little Bill]

MAP voltages

Voltage readings are here



If you are using an older scan tool it will read higher pressure than actual. Beginning in 2001 the MAP output was calibrated to absolute pressure with 1 volt = atmospheric pressure. Pre-'01 was around 0. 5 volts at atmospheric.

 

[Silver Bullet Ram]

Little Bill, the link you posted sent me to the main page of the tdr website.



Gary

 

[Little Bill]

Sorry, I'll do the old fashioned cut and paste. Seems to be more my speed.



Boost Voltage

0 1. 045

6 1. 48

10 1. 75

15 2. 05

18 2. 27

20. 5 2. 44