smegun
Member
- Joined
- Jul 16, 2019
- Messages
- 51
- Reaction score
- 0
- Points
- 6
- Location
- florida
- Vehicle Year
- 1994
- Make / Model
- ford explorer
- Transmission
- Automatic
if im looking at skeematic(pdf) I notice an area( } ) were limited is noted if I follow traces I see the o2 sensors are in the circuit with the cmp .... I asked a patron about it ... I was asking cause I got continuity beeps from the red grey wire and lt blue grey wire across the harness and engine bay in areas so I was asking about a possible grounding issue while testing the wire harness for cross talk looking possibly for a faulty sensor ...the patron relieved me to state its a common ground to the sensors and its supposed to do that …. finer notes : there are a few areas on the schematic of which we were conferring on ...what is called "hot in run" and "limited only" my truck got codes 216 and 563 I solved the 216 it was a relay that was temper mental as well the truck ran that much better... I checked fuse 18 also but it was solid ...I still had the 563 error supposedly the inertial fuel switch but doesn't appear disconnected yet … still not there yet I drove the truck again tonight and came up with two new codes 175 176 o2 sensor codes …. I thought my pcm was ok ?...I like the way it goes through the test sequence I can here it working the switches I even thought there was a squeegee of the ABS unit ...sounds like a wet dream
"something I had been looking forward too isolating an earlier ABS question of how to bleed the unit "
my last experiment this evening was a pcm change because I remembered I pulled the unit above from the yard an almost virgin explorer the one with a white monochrome grill I should of took the whole truck but that's another story someone already took the seats and carpets they must of been cherry it was right front totaled with 30k on it so I stole the brain on a half off day ….it had been In my truck since the day of experiments :/ ... I knew after short test run tonight it wasn't quite right yet and I had the two new codes so I put in the original pcm duh ! the truck is almost running as expected as from a complete head job its somewhat hopeful again just that much better ! ... ill pull the codes again soon but I think there is something to think about here on the circuit with the o2 sensors is that the firmware / changes in the pcms do different things … like the truck runs better now but the brakes are not as firm ? and the way it handles the o2's I want to believe that the circuit is actuated differently concerning the PCM like the cpm and o2 sensors on these lines and maybe the fueling regarding the 563 … still have much to do on truck but maybe it was never meant to get away from the build date on these PCM boxes check out attachments and tell me what you think constructively pleas supposedly this is an area of strict C of types like one pcm auto bleeds on the test sequence so weres that? that fuel pressure is maped differently ? that brakes are primed differently ? as there is more breaking power with the former PCM ?
the lable and main numbers look to be the same to the most part for the PCM's UMP1 etc ......but up close the build dates are different ... have been having difficulty with tuning up the Explorer since this rebuild started from a dead motor brain /valve it lives again thought it was the crank sensor at least it got me running again on all cylinders ..
my last experiment this evening was a pcm change because I remembered I pulled the unit above from the yard an almost virgin explorer the one with a white monochrome grill I should of took the whole truck but that's another story someone already took the seats and carpets they must of been cherry it was right front totaled with 30k on it so I stole the brain on a half off day ….it had been In my truck since the day of experiments :/ ... I knew after short test run tonight it wasn't quite right yet and I had the two new codes so I put in the original pcm duh ! the truck is almost running as expected as from a complete head job its somewhat hopeful again just that much better ! ... ill pull the codes again soon but I think there is something to think about here on the circuit with the o2 sensors is that the firmware / changes in the pcms do different things … like the truck runs better now but the brakes are not as firm ? and the way it handles the o2's I want to believe that the circuit is actuated differently concerning the PCM like the cpm and o2 sensors on these lines and maybe the fueling regarding the 563 … still have much to do on truck but maybe it was never meant to get away from the build date on these PCM boxes check out attachments and tell me what you think constructively pleas supposedly this is an area of strict C of types like one pcm auto bleeds on the test sequence so weres that? that fuel pressure is maped differently ? that brakes are primed differently ? as there is more breaking power with the former PCM ?
the lable and main numbers look to be the same to the most part for the PCM's UMP1 etc ......but up close the build dates are different ... have been having difficulty with tuning up the Explorer since this rebuild started from a dead motor brain /valve it lives again thought it was the crank sensor at least it got me running again on all cylinders ..
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