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Ive changed the fuel filter, crank position sensor, cam

Customer Question
postion sensor on my 2000...
ive changed the fuel filter, crank position sensor, cam postion sensor on my 2000 jeep grand Cherokee 4.7. still showing po320 and po725 code failures....help!!!!
Submitted: 2 years ago.Category: Jeep
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Customer reply replied 2 years ago
it is difficult to start it wont idle properly the rpm goes up and down like it breathing. then it starts popping and stalling between 2500rpm and 3000rpm.
Customer reply replied 2 years ago
I tested the fuel pump right off the bat by disconnecting it at the manifold it is fully operational.
Customer reply replied 2 years ago
there is also a strange humming sound somewhere under the hood when I do actually get it started, it sounds like something electrical making the humming sound. I have not attempted to leave the driveway since the symptoms began out of nowhere, besides it will die if I try.
Answered in 8 hours by:
10/6/2015
Jeep Mechanic: Jon, ASE Certified Technician replied 2 years ago
Jon
Jon, ASE Certified Technician
Category: Jeep
Satisfied Customers: 310
Experience: Master Chrysler/Jeep/Dodge Tech
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Hi, do you have a scan tool?

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Customer reply replied 2 years ago
that is how I am getting the codes, po320 and po725
Jeep Mechanic: Jon, ASE Certified Technician replied 2 years ago

Ok, if you go into data display, is the crank sensor signal showing not present when you crank the engine?

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Customer reply replied 2 years ago
I'll check it in the next hour
Jeep Mechanic: Jon, ASE Certified Technician replied 2 years ago

Ok, I'm guessing it will not be present considering the codes you have. If it isn't, check for 5 volts with a meter on the orange wire going to the crank sensor. Also check for 5 volts at the orange wire at the cam sensor. Let me know what you find.

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Customer reply replied 2 years ago
I'm still working on it. Out of town till tomorrow. Will try tomorrow
Jeep Mechanic: Jon, ASE Certified Technician replied 2 years ago

Ok.

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Customer reply replied 2 years ago
23 on orange wire from crank sensor
Jeep Mechanic: Jon, ASE Certified Technician replied 2 years ago

OK, that's a problem. I don't have a computer near me right now but unplug the crank sensor and recheck it. If it doesn't go up to 5 volts or very close, try unplugging all the other sensors 1 at a time and recheck. It could be a sensor shorting out that 5 volt supply.

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Customer reply replied 2 years ago
All the other sensors?
Jeep Mechanic: Jon, ASE Certified Technician replied 2 years ago

Cam, crank, MAP, and TPS look like they're on that orange 5 volt supply. Try unplugging those and recheck for the 5 volts.

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Customer reply replied 2 years ago
I will today and get back to you
Jeep Mechanic: Jon, ASE Certified Technician replied 2 years ago

Ok

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Customer reply replied 2 years ago
Replaced map sensor appears to have fixed problem running fine.
Customer reply replied 2 years ago
Stalled once at stop light. Other than that, running good. May replace throttle position sensor as well, your thoughts?
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Jon
Jon
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