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No fuel injector Pulse

Tiny
RICK A
  • MEMBER
  • 5 POSTS
Ok is a noid light the same as my little ice pick device with the 12v bulb in it?
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Wednesday, September 13th, 2017 AT 10:38 AM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,874 POSTS
Chrysler made reading the fault codes yourself easier than any other manufacturer. Cycle the ignition switch from "off" to "run" three times within five seconds, leave it in "run", then watch the numbers appear in the odometer display.

Assuming you had twelve volts on the green wire for that first second, the engine computer is not turning it on during cranking due to a loss of signal from the crankshaft position sensor or the camshaft position sensor. Hopefully you will have a fault code for that, but often the code does not set right away. In that case you will need a scanner to view live data and see which sensor is listed as the signal is missing.
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Wednesday, September 13th, 2017 AT 10:38 AM (Merged)
Tiny
RICK AMES
  • MEMBER
  • 1 POST
I bought a rebuilt computer, it starts and runs great now, but they sent me one without the alarm stuff on it, so the alarm is on all the time, we never liked the alarm, so how do we disable? I plan on making them give me the right one, but we would like to drive in the mean time, as it took 2 weeks to get the wrong part, who knows how long it will take to get the right one.
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Wednesday, September 13th, 2017 AT 10:38 AM (Merged)
Tiny
OSGOOD
  • MEMBER
  • 1 POST
  • 1996 JEEP CHEROKEE
Engine Performance problem
1996 Jeep Cherokee 6 cyl Four Wheel Drive Automatic

I am not getting a spark and I have change the ignition coil and the distributor cap as well as the plugs and wires, but at the same time I am not getting fuel to the injectors.
What could be the problem?
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Wednesday, September 13th, 2017 AT 10:38 AM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Your getting no fuel pressure either? Or no injector pulse.

Check for +12v on one side of the coil and a pulsing -12v on the other side.

Check the ASD relay and fuse
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Wednesday, September 13th, 2017 AT 10:38 AM (Merged)
Tiny
STEFANLOBNITZ
  • MEMBER
  • 3 POSTS
  • 1995 JEEP CHEROKEE
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
I have 95 jeep cherokee that was in a accident and the air bag deployed an now it won't start it has spark but no fuel pressure on injector rail an I don't hear fuel pump turn on when I turn ignition on iv tryed replacing the fuel pump relay that did not work the vehicle does have factory anti theft device. There is a plug under the steering wheel an it has the device the plugs into it so that's not the problem I was hoping you could tell me if there is a fuel cut off switch an where it is located or if there is something I don't know about that might cause this problem?
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Wednesday, September 13th, 2017 AT 10:38 AM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,874 POSTS
If you have spark, you have all the important stuff working. Bypass the fuel pump relay by jumping terminals 30 and 87 together, then, if you don't hear the pump running, you can test at the fuel pump plug for 12 volts. A test light is more accurate for this than a voltmeter.
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Wednesday, September 13th, 2017 AT 10:38 AM (Merged)
Tiny
JLDIABLCARWASH
  • MEMBER
  • 1 POST
  • 2000 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 118,000 MILES
Replaced crankshaft and cam sensor. Have spark and fuel at fuel rail but spark plugs are dry. Turns over but no start. Problem started after I started it.
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Wednesday, September 13th, 2017 AT 10:38 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Test the fuel injectors for battery voltage at one of the wires and use a test light to check for pulsing of the injector circuits while cranking.
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Wednesday, September 13th, 2017 AT 10:38 AM (Merged)
Tiny
I6GRAND
  • MEMBER
  • 1 POST
  • 1997 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 136,000 MILES
Electrical problem
1997 Jeep Cherokee 6 cyl Four Wheel Drive Automatic 136000 miles

My '97 Grand Cherokee will not start. I know it's getting fire and I do not hear the fuel pump kick in.

What I'd like to know, before I drop the tank, is how can I make sure that my fuel pump is getting power?

I do have previous auto mechanics experience and I'm sure it's not the fuel filter or injectors.

Thanks in advance.
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Wednesday, September 13th, 2017 AT 10:38 AM (Merged)
Tiny
CRZYDRVR
  • MEMBER
  • 432 POSTS
If you have the equipment, use the Snap On Vantage Pro with a low amps probe.
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Wednesday, September 13th, 2017 AT 10:38 AM (Merged)

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