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I would first check for error codes using an OBD-II scanner tool- then research the Diagnostic Troubleshoot Code(s) to point you in the direction of the problem. Most common error is when DIYers read the scanner tool and automatically assume scanner codes pulled will pinpoint the exact problem. Scanner tools vary in scope. The bottom line, use the tool as a starting reference point, but you will have to test the component to make sure it is the one that is malfunctioning. You can read more about OBD-II codes at the following URLs:
Your vehicle is equipped with an OBD II computer AND a link to connect OBD II computer to a Smog Check Analyzer or Data Scan Tool (available
at most auto part stores).There are two types of codes, bad codes and good codes. The good codes are the "Readiness Flags". These Readiness Flags
indicate that certain emissions systems which the OBD II computer has been monitoring have PASSED the test, indicating that those systems are
working properly. Then there are the bad codes. The bad codes are actual "Trouble Code". These codes indicate that the OBD II computer
has detected a problem with in the emissions system. The Trouble Code will specifically indicate the component and problem which was found.
Newer vehicle's have very complex codes in the thousands.
"Readiness Flags" do not cause the "Check Engine" light to illuminate, but may cause a vehicle to fail the smog test.
In order to set all the proper "Readiness Flags" the OBDII system must complete at least one drive cycle (in some cases
two or three). A drive cycle is a sequence of internal tests which the OBDII computer runs while your vehicle is being driven. This insures
all emissions systems are functioning properly. Only then will your vehicle pass the smog inspection. A drive cycle usually requires one
week of driving.
The first thing you have not checked is fuel pressure. The pressure could be low, or the fuel filter could be clogged. It takes more fuel to run the engine in the first 5 minutes until it warms up than under normal conditions. The codes mean the sensors are not giving the computer the readings they should, but it does not always mean the sensors are faulty. If the engine is running rough, or the fuel mixture is lean, the sensors will show that. Code 44 is O2 sensor reading lean which may be true. Code 33 is MAP sensor reading low vac which may also be true. Another possible cause is the coolant temp sensor may not be telling the computer the right thing. If it tells the computer the coolant is 200 degrees and the engine is cold, you won't get enough fuel thru the injectors.
This code pertains to communication from one computer to the next,they all are on a communication circuit (class II) & you have a short to ground somewhere.If a scan tool is able to communicate with the computer(and it is since you got a failure code) this code is intermitten.Get a good volt meter or scan tool & start at the ALDL (where the scanner plugs in).Inspect & check wiring as you keep an eye on the scanner or meter.
DTC Parameters DTC U1300 will set if the EBTCM, PCM, or SDM detected the Class II circuit in the low state for too long. (Class II circuit shorted to ground) when: • Condition exists for longer than 4 seconds for EBTCM, 2 seconds for PCM and SDM. • Ignition is On.
DTC U1300 diagnostic runs continuously with ignition On.
DTC U1300 is a type C DTC. Diagnostic Aids If the scan tool can communicate with the EBTCM, PCM or SDM, then the Class II link is not currently shorted to ground.
Inspect the wiring harness for signs of chafing or broken insulation.
Important: The controller name won't be displayed until the scan tool initially received the correct controller ID over the link upon ignition On.
Important: The BCM CANNOT set U1300.
To locate an intermittent problem, use the scan tool to monitor any of the controllers on the Class II link located under DIAGNOSTIC CIRCUIT CHECK - - - CLASS II MESSAGE MONITOR with ignition On, engine Off. INACTIVE will be displayed on all controllers if the link is shorted to ground.
if the obd 2 reader won't scan and it will not run it is probably a computer problem could even be a wiring problem to the computer not sure if you can get those checked or bite the bullet and buy one. call the jeep dealer in the morning and ask if they can check a computer to see if it is bad
Sometimes i can get it to retrieve on another station. Maybe its a communication issue and taking too long to retrieve so it timed out. also you can change the program to wait longer before timing out.