MAP Sensor Troubleshooting
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MAP Sensor Troubleshooting
Hey y'all, new to the forum, often come here via google for good troubleshooting information. I've come across a problem I couldn't find via google.
I have a 1997 250 Powerstroke with a Donaldson filter, 5" straight exhaust, TS 6 Position, and Edge CTS Insight 2 monitor.
I noticed recently on my monitor that my boost pressure(pulled from OBD port) reads MUCH lower than the mechanical boost gauge I have. Cruising at 70 mechanical show ~10psi and Edge shows 2. In all my research I read that, in the event of a MAP sensor failure, the computer guesses based on a predetermined number. I unplugged my MAP sensor to see if there would be a change and NOTHING changed. Truck runs the same, boost numbers on the Edge are the same and no CEL codes, not even dormant ones. Shouldn't I see a code for the map sensor open circuit or something? Everything I read says these trucks run like crap when a MAP sensor fails, but she seems to run fine. Any suggestions?
The truck is a California model(not 100% sure how that affects computer operation). Also, until about a month ago I was getting over boost CEL and glowplug CEL, haven't seen anything in a while.
I have a 1997 250 Powerstroke with a Donaldson filter, 5" straight exhaust, TS 6 Position, and Edge CTS Insight 2 monitor.
I noticed recently on my monitor that my boost pressure(pulled from OBD port) reads MUCH lower than the mechanical boost gauge I have. Cruising at 70 mechanical show ~10psi and Edge shows 2. In all my research I read that, in the event of a MAP sensor failure, the computer guesses based on a predetermined number. I unplugged my MAP sensor to see if there would be a change and NOTHING changed. Truck runs the same, boost numbers on the Edge are the same and no CEL codes, not even dormant ones. Shouldn't I see a code for the map sensor open circuit or something? Everything I read says these trucks run like crap when a MAP sensor fails, but she seems to run fine. Any suggestions?
The truck is a California model(not 100% sure how that affects computer operation). Also, until about a month ago I was getting over boost CEL and glowplug CEL, haven't seen anything in a while.
Hotshot
Joined: Feb 2009
Posts: 10,408
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From: Plankinton, SD
Welcome to fte. Sounds like something is wrong with your mechanical gauge. 2 psi is more like you should see @ 70 with no load behind you. I see about 10psi or a little more @ 70 when towing my trailer.
What were the code numbers setting the cel before?
What were the code numbers setting the cel before?
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Hmmm, good to know. I'll get another gauge and run a test to see how it compares to the Edge. Still unsure of where the 2psi reading is coming from with my MAP sensor disconnected.
I honestly don't remember the codes, only that one indicated my boost pressure was too high, and then I had a code for glow plug voltage being too low on both banks(2 separate codes).
I honestly don't remember the codes, only that one indicated my boost pressure was too high, and then I had a code for glow plug voltage being too low on both banks(2 separate codes).
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JOHN2001
1999 - 2003 7.3L Power Stroke Diesel
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Sep 13, 2012 12:36 PM
