Question about Jeep Grand Cherokee
Code po748 loss of first an overdrive also tempature sensor an low coolant flashing on yhe lcd even after i changed the sensor and its full of coolant also apears the pcm has been changed in the past and it dont i.d when i hook the snap on up to it runs great looks great bought it as a no start lor $1500 he said the security was on and the keyless entry wouldnt wrk to get it to start i didnt get a new one or the old one reprogramed i just stuck the key in the passenger door and unlocked it an tried to start an it did now their is a toggle switch in the jeep that looks to be hooked to fuse panel and coil thats as far as ive got on that topic you can turn the key to the off position and and pull it out but and it will kill the accessories but not shut down till you shut toggle switch off im starting to think i need to get a new pcm with all the lack of comunication with things or is just lots of small things i need to fix it is a 1997 jeep grand cherokee limited quadratrac now mind u this it will drive anywere u want to go takes off in second most of time an no overdrive so gas milage suck buts i do love the jeep i bought to be a toy because its got a 4inch lift and 17inch wheels an ive played with it a bit and it runs great no knocking sputtering ect....can anyone help i want to make this a daily driver 4+4 it has a new cpu put in 2007 i have had my snap on modis hooked up for hours and days i want to simply drop tranny pan filter an replace govener preasure solenoind but buy the time i buy it fluid an filter kit 200$ just in parts and stilll wont no if thats the root of my problem becase my trans controll module is showing off on my scanner with that being off im not getting all the proper comunication with the computer to the scanner to check certain preasure volts vacume ect because any of the transducers modules sensors ect can cause trans controll modules to go to the off position am i thinking to hard here or is my computer just screwed up matbe have it flashed any1 with any ideas please help me with what to check i have everything but a allingment rack in my shop so tools time and work arnt the issue im divorced with 5 kids an money is very tight right now thanks to all whom take time to read
If the code came back then the part you replaced is not the problem. Simple as that.
Posted on Nov 19, 2013
Testimonial: "no sir ive not replaced the part for the simple reason that the tcm shows that the operating state is off so this is when its frushtrating to own a up to date currernt software scanner probe datachart snap-on modis $14.0000 is what i have in this tool it will do it all ive been doing this 16yrs even though thats the code on a chrysler product its very rare the code is the actual problem a guys jeep i fixed last week had same code an speed sensor an abs light so it wouldnt shift unless u done it by hand so u take off in 3rd no o.d 1997 grands limited have special needs anyways they b4 they brought it to me after they replaced gov presure solenoid same isssue still occured so then they droped pan an replaced tranducer still same code then shift solenoid still no fix they then dropped pan an replaced tcm still no fix now i get it digging tru past old codes i saw speed sensor over an over in deleted history codes i put it on data stream live drove down the road an rr didnt show a speed so the whole problem was speed sensor to shut off tcm to put it in what they call limp mode fail safe mode and throw the po748 code the speed sensor also trigered a poor signal to pcm that it caused the abs light to trip maybe i made myself sound dumb by my post i wrote it the way i did hoping someone would have had said something i did nt no but no ill give you some free education for the future just because their is a code light on an you change that part an no fix dosent mean its a bad part usally the oppisite i need help not smartass arrogent uneducated comments but tk you for trying"
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Posted on Jan 02, 2017
SOURCE: Which fuses can I remove
I don't know about a dedicated fuse but you can try disconnecting the battery for a few minutes then, with the battery still disconnected, turn the ignition key to on, then reconnect the battery. This has been a known way to also disarm the factory security.
If that doesn't work, and if you are handy with vehicle electrical, you can ground the factory disarm wire, to permanently disarm the factory security. It's location and color;
Factory Disarm Purple/Yellow (-) Driver's Kick Panel Black Connector
Posted on Feb 07, 2011
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P-0748 GOV PRESSURE SOL CONTROL/TRANS RELAY CIRCUITS
When Monitored and Set Condition:
P-0748 GOV PRESSURE SOL CONTROL/TRANS RELAY CIRCUITS
When Monitored: Continuously with the key on.
Set Condition: This code is set if the voltage detected on the Governor Pressure Solenoid
Control Circuit at the PCM is different than the expected voltage for 4.8 seconds.
NO POSSIBLE CAUSES REMAINING
FUSED B(+) CIRCUIT OPEN
SOLENOID AND HARNESS ASSEMBLY DEFECTIVE
GOVERNOR PRESSURE SOLENOID DEFECTIVE
TRANSMISSION CONTROL RELAY DEFECTIVE
GOV PRESSURE SOLENOID CONTROL CKT SHORT TO GROUND
GOVERNOR PRESSURE SOLENOID CONTROL CIRCUIT OPEN
GOVERNOR PRESSURE SOLENOID WIRING HARNESS INTERMITTENT DEFECT
GOVERNOR PRESSURE SOLENOID WIRING HARNESS OBSERVABLE DEFECT
TRANSMISSION RELAY OUTPUT CIRCUIT OPEN
TRANSMISSION RELAY OUTPUT CIRCUIT SHORTED TO GROUND
PCM DEFECTIVE (GOV PRESSURE SOLENOID SHORT TO VOLTAGE)
PCM DEFECTIVE (RES IN RANGE)
PCM DEFECTIVE (GOVERNOR PRESSURE SOLENOID DEFECTIVE)
PCM DEFECTIVE (CONTROL CIRCUIT SHORTED)
PCM DEFECTIVE (SOLENOID & HARNESS ASSEMBLY DEFECTIVE)
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