Wrench light when towing
Elder User
Joined: Nov 2010
Posts: 514
Likes: 1
I recently installed the Scangauge II in my '03 6.0 and was quite surprised by some of the numbers when we pulled our 5th wheel to the Davis Mountains and Big Bend over the holidays. In tow/haul mode with the cruise control set on 60, I saw 253 degree oil temps a few times. The boost would peg out and become unreadable. It looks like the MAP only reads to 40 PSI (boost + atmospheric). It was scary to watch, but when the numbers got crazy, the computer backed off and didn't try to maintain the cruise setting. The truck did real well on the trip for having 107K miles. It's pretty scary to see it kick down the tranny and run up to 3000+ revs going up all the hills. I was waiting for it to blow up at any time.
Regarding oil temp, when I used the codes from the X-Gauges pdf to set up EOT, the numbers were ridiculously high. I found an alternative code that worked correctly. Do your ECT, EOT, and TFT all read within a degree or two when cold? If the EOT is higher than that, you probably need the other code in there.
Lead Driver
Joined: Oct 2010
Posts: 5,420
Likes: 16
From: Ouray, CO
Cheezit, the MAP reading getting pegged to 40 is actually boost PSI + atmospheric pressure (14.7), so anytime you are pushing about 25+ PSI, the reading goes crazy. As I recall, mine does the same thing.
Regarding oil temp, when I used the codes from the X-Gauges pdf to set up EOT, the numbers were ridiculously high. I found an alternative code that worked correctly. Do your ECT, EOT, and TFT all read within a degree or two when cold? If the EOT is higher than that, you probably need the other code in there.
Regarding oil temp, when I used the codes from the X-Gauges pdf to set up EOT, the numbers were ridiculously high. I found an alternative code that worked correctly. Do your ECT, EOT, and TFT all read within a degree or two when cold? If the EOT is higher than that, you probably need the other code in there.
be equal again. Since the TFT doesn't typically get has hot, it cools
off more each night. But if it sits for 2 days, all 3 are the same.
The ECT & EOT or normally very close to each other after sitting for
a "several hours".
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Freshman User
Joined: Sep 2004
Posts: 41
Likes: 0
Well I have purchased a Scan Gage 2 and getting ready to head home next week. I added the ECT and EOT to the gages so I should be ready If and when it throws a code.I have about 2000 mile to go so I should find out something.Does the freeze frame work automatically when it throws a code? Thanks for all the help so far I am going to beat this thing one way or the other.
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Freshman User
Joined: Sep 2004
Posts: 41
Likes: 0
Well 450 miles so far and no wrench light yet 
coolant temp and oil temp is usually 6 to 10 degrees of each other oil is always hotter. about 198 to 200 pulling a 32ft fifth wheel should be out of Texas tomorrow.should be in the hills in a couple of day for the real test really like the Scan Gage
coolant temp and oil temp is usually 6 to 10 degrees of each other oil is always hotter. about 198 to 200 pulling a 32ft fifth wheel should be out of Texas tomorrow.should be in the hills in a couple of day for the real test really like the Scan Gage
Elder User
Joined: Aug 2003
Posts: 933
Likes: 0
From: Québec
I had the wrench light when towing many times on a run down to florida, the light went off after restart. Ford said I had an overboost and maybe the MAP sensor got a bit offset. First trial was blowing / sucking the MAP Tube and clean the connectors on the MAP sensor but that did not help, first hill and the light was back on, engine going to limp mode, 2500 rpm at the most.
They finaly changed the MAP sensor and it fixed it. I floored it many times going up hill with the trailer and camper on it, reading about 28 PSI turbo and holding it there, now have around 3000 miles on it and never had the light again.
They finaly changed the MAP sensor and it fixed it. I floored it many times going up hill with the trailer and camper on it, reading about 28 PSI turbo and holding it there, now have around 3000 miles on it and never had the light again.
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5th Wheeling
Joined: Jun 2007
Posts: 30
Likes: 0
From: East Lyme
Last weekend I too saw the WRENCH.
Boost gauge was hitting 28/30 on a long hill.
Took my 06 to dealer, read the codes my Scangauge2 couldn't.
They cleaned the turbo and EGR valve.
This weekend the Boost Gauge never exceeded 21/22, pulled the hills in Vermont, 11.5 MPG average.
Boost gauge was hitting 28/30 on a long hill.
Took my 06 to dealer, read the codes my Scangauge2 couldn't.
They cleaned the turbo and EGR valve.
This weekend the Boost Gauge never exceeded 21/22, pulled the hills in Vermont, 11.5 MPG average.
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