Question about 2007 Ford F-450 Lariat
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Posted on Jan 02, 2017
SOURCE: 2000 Ford F450 7.3 Diesel Engine
Your throttle is "fly-by-wire" which means that it is completely controlled by the computer. There are several switch and sensor inputs and an output circuit to the throttle actuator motor.
Both your gauges and you Idle Validation Switch are protected by fuse #19 (10 Amp) in the Central Junction Box, which is located at the lower left-hand side of the instrument panel. There are a lot of things also protected by this fuse including the Generic Electronic Module (GEM). There will be a lot of things malfunctioning if this fuse is blown. This fuse gets its power from the ignition switch.
I would start by checking this fuse to (A) see if it is blown and (B) Make sure that this fuse is receiving power from the ignition switch. If it is blown, it will do no good to replace it until you can locate and repair the reason that it blew. If it has no power, you may have a bad ignition switch and/or a burned connector at the ignition switch.
Please also review these articles: Where's The Fuse? What Else Could Be Wrong?
If this does not turn up any problems (i.e. the fuse is OK and is getting power from the ignition switch) I would scan both the GEM and the Powertrain Control Module (PCM) for fault codes before even trying to perform any further diagnosis or attempt any repairs. There will most likely be fault codes present and/or the GEM may refuse to communicate with the scanner, either of which will help to determine the game plan for getting this problem resolved. Since the engine starts and runs, The PCM is not likely to have non-communications problems, but it can also report engine management system faults or communications problems with other modules. If the GEM is working, it may tell you if there is something wrong with the PCM. So, it is imperative to scan both for a complete diagnosis.
Posted on Jul 25, 2011
after it has shut down check for gas at the fuel rail with the key on their should be gas squirting out constantly it sounds like the fuel pump is going out
Posted on Jul 28, 2009
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