Today I installed a new Accelerator petal ($111 at Rock Auto) and a new MAP. I understand the GDE tune eliminated the EGR function and the MAP is primarily tied to the EGR but on the chance that it may be also tied to the variable vain turbo, I cant go wrong putting a new one in for the 25 bucks it cost. I wanted to splice in a new ground off the petal ground wire but could find no info of which of the 6 wires is the ground. If someone can look up which pin or color wire that is, I would appreciate it. These new solid state Pots are beyond my ability to determine which is the ground.
I also wanted to clean up any grounds that I could find and the only one I spotted easily was the large ground behind the battery. I cut the connector off, opened it up to remove the old pinched in wires, cleaned the new strands up with a SS brush and soldered the connector back on. These grounds are starting to show cleanable corrosion after 11 years.
According to this older post, some have found the front wheel speed sensors to be at fault and the Alternator is also a player despite the battery being well charged at all times. Those 2 items will be in the next plan of attack if the light has not yet been put to permanent sleep.
viewtopic.php?f=5&t=75694After thinking about the Alternator being a possible cause, I remembered an issue of Transmission shift wandering on my 01 Dodge Cummins PU. One of the fixes was to wrap the Alternator hot wire with aluminum foil. I found that fix greatly improved that particular issue. Now on the Jeep, they routed the main harness bundle within an inch or so of the Alternator. As it was explained on the CTD in depth, a good Alternator can actually have a bad or weak diode. When they do, the Alternator sends out a dirty magnetic signal into any wires that are near by especially the main hot wire. With the ECM having so many tight sensor parameters, washing the wires down in a "dirty" electro magnetic wave form may well cause issues as it does to the CTD trany drive train module. So here is my step one. A foil wrapped and zip tied main harness section behind the Alternator. Here I removed the tri bracket to pull the harness up for a nice foil treatment.
The trip out to Knoxville next week will tell me if I have it licked. If it comes on again, I'll foil the hot wire next.
Amazing that the jeep runs so well with both the GDE engine & trans tune yet out of no where the lightning bolt dings up onto the dash! No codes, Mostly high speed cruising after half and hour or more driving but not allways. On rare occasion, right after start up. No rhyme nor reason to the ETC light.