MAP sensor value
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Cargo Master
Joined: Jul 2005
Posts: 2,309
Likes: 364
From: Kansas
MAP sensor value
Using a Diablosport Predator to read the MAP sensor value on a 2001 always reads 0.0hz. Other posts I have read I should be seeing over 100hz just from normal atmospheric pressure. Assumed the MAP sensor was faulty, it was replaced but the Predator still displays 0.0hz. I haven't traced the wiring going back from the MAP sensor, but I would assume that is a good place to start?
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Cargo Master
Joined: Jul 2005
Posts: 2,309
Likes: 364
From: Kansas
started investigating decreased performance and poor fuel mileage on my Dad's truck. Noticed the 0.0hz reading and read some posts where the MAP sensor may cause similar symptoms. Also there is no diffference in performance with the electrical connector of the MAP disconnected. Some posts state there should be a noticeable difference...
I did some searching to find out if the predator is capable of reading the map, but didn't find anything.
I can fix my '79 no matter what's wrong with it, but don't have much experience with the powerstroke.
Thanks a bunch for the reply.
I did some searching to find out if the predator is capable of reading the map, but didn't find anything.
I can fix my '79 no matter what's wrong with it, but don't have much experience with the powerstroke.
Thanks a bunch for the reply.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Have you tried cleaning the EBP tube? That would have been my first guess for your issues. As for the 79. It's not new enough to be complicated. If you let me add a couple of hundred sensors to it I'll bet you never figure it out.
Have you checked the voltage on the MAP?
Analog Manifold Absolute Pressure Sensor
The analog Manifold Absolute Pressure (MAP) sensor is a variable capacitor sensor that is supplied a 5-volt reference signal by the PCM and returns a voltage signal to the PCM relative to intake manifold pressure. The sensor voltage increases as pressure increases. The MAP sensor allows the PCM to determine engine load to calculate fuel quantity. In addition, the MAP signal is used to control smoke by limiting fuel quantity during acceleration until a specified boost pressure is obtained.
A MAP signal fault detected by the PCM will cause the PCM to calculate an estimated manifold pressure based on known engine conditions.
Have you checked the voltage on the MAP?
Analog Manifold Absolute Pressure Sensor
The analog Manifold Absolute Pressure (MAP) sensor is a variable capacitor sensor that is supplied a 5-volt reference signal by the PCM and returns a voltage signal to the PCM relative to intake manifold pressure. The sensor voltage increases as pressure increases. The MAP sensor allows the PCM to determine engine load to calculate fuel quantity. In addition, the MAP signal is used to control smoke by limiting fuel quantity during acceleration until a specified boost pressure is obtained.
A MAP signal fault detected by the PCM will cause the PCM to calculate an estimated manifold pressure based on known engine conditions.
Thread Starter
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Cargo Master
Joined: Jul 2005
Posts: 2,309
Likes: 364
From: Kansas
I took the EBP sensor off and started it and it blew what little bit of soot that was in the tube out. Also checked the sensor itself, but it wasn't plugged. I will check the voltage at the map. I have a shop manual on CD for the pinouts.
Thanks again for the assistance.
Thanks again for the assistance.
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