Question about 1999 Jeep Cherokee
Fuel pump stays on continuously when switch is on, no bus displayed on odometer, fuel pressure is now all of a sudden between 15-20 psi. and ofcourse snapon scanner will not communicate.The first time it acted up i checked the fuses and found the iod fuse blown, i replaced it, with no different results. i was able to get it started by hitting the press. release on fuel rail. that only worked once. Are all of these related symptoms of a bad pcm?
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Posted on Jan 02, 2017
Ok, I had a very similar trouble. It cost me a lot in diagnostic time, but here's what my mech. found.
Symptom, no fuel flow. I don't remember the guages status. Fuses and relays were good. but had blown fuel pump fuse in the past.
Found: Hose connector (A.C.) in vicinity of the fuse box under the hood. (underneath) was chafing the harness from the fuse block to fuel pump, guages, etc. wiggle adjustment temp fixed. Mech found short/ground/ exposed copper wire and repaired the connections. also, protected wire from future damage.
A poorly place connector / harness and vibration were the contributors to the incident. Fix was good and so far permanent.
Posted on Oct 03, 2008
Its the TIPM in the PCM. Its part of the recall. That is what's causing the fuel pump to not turn on. What ever you do, DO NOT reroute power to the fuel pump because that will fry the TIPM and cost you $500.00 to fix. Just tow it into the dealer and they will fix the recall for free.
Posted on Jul 13, 2009
If the data link is not talking to the computer check your ground at the computer and at the data link connector to see if the computer is even alive ground pin 3 on DLC with the key off then turn key to the run position if it flashes the check engine codes record them, if no engine light, does the engine light come on when you turn the key on then go off? if not, check fuses if not check power for pin on computer, if it has power you have a bad computer. But TEST THE GROUNDS IT IS THE BIGGEST FAILURE For these rigs or any manufacture. check that you have power also at the DLC too. if not you need a digital ohm meter and a subscription to http:///.www.alldatadiy.com and start reading the campaigns on that vechile for computer and trouble tree for dead DLC and computer. I don't have that subscription or I could tell you more where to look, if you need anymore help let me know. Also if the crank sensor could cause it not to run the fuel pump but so can the cam sensor. You need to find out if the computer gets it's pulse for the pump at the computer if it does then you need to test them both. There are three wires a ground a colored power wire and a wire to go to the computer you can test these sensors with a meter to see if there is a pulse to each. sometimes the fuel pump gets it's signal from the coil pack so it's important to have the subscription, you can do a search for each item and test them as needed and has a wiring diagram.
Posted on Jul 27, 2009
SOURCE: 2000 Jeep Grand cherokee Laredo
sounds alot the the pcm it controls the fuel pump and ign system but the anti theft would keep it from starting because the key has a transponder in it programmed for that vehicle and that would kill all ign if triggered
Posted on Sep 27, 2009
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