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I have a 2002 dodge ram pickup, I changed the fuel pump and

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relays I am still not...
I have a 2002 dodge ram pickup, I changed the fuel pump and relays I am still not getting any fuel pressure whats the problem ?
Submitted: 1 year ago.Category: Dodge
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Answered in 1 minute by:
8/22/2016
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 1 year ago
Juan Crespo
Juan Crespo, ASE Certified Technician
Category: Dodge
Satisfied Customers: 1,529
Experience: A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
Verified

Hi there.

Is the fuel pump getting any voltage? If not, is the relay getting energized?

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Customer reply replied 1 year ago
the relay is getting is getting power and clicking but still no fuel pump energizing. also to note there is no ignition. fuses are good including the ASD relay which is clicking.
Customer reply replied 1 year ago
possibly the pcm/ecm?
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 1 year ago

If the fuel pump relay is getting power and clicking, then the PCM is doing its job. Is the anti-theft on?

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Customer reply replied 1 year ago
if we cant get this ill call.
Customer reply replied 1 year ago
what about the no ignition? sprayed starter fluid in the throttle body and still doesn't attempt to start. like there is no ignition either
Customer reply replied 1 year ago
can't say i've ever seen this problem. fuel pump or wiring yes but no ignition too?
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 1 year ago

In order for me to be able to help you, I need you to you answer these questions:

  • is the anti-theft on?
  • with the engine cranking to start, what is the voltage at the fuel pump connector Dark Green/White wire?
  • with the ignition switch on, what is the voltage on the Dark Green/Orange wire going to any of the coils or injectors?
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Customer reply replied 1 year ago
aren't aware of any antitheft or alarm. ill check voltage at both the pump and injectors
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 1 year ago

The truck is supposed to have an anti-theft system that includes a transponder key. You might try first using an original second or spare key to see if that solves the issue.

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Customer reply replied 1 year ago
injectors are getting 12 volts. with the key turned on green wire with white tracer has 12 volts for less than a second and you can hear the fuel pump come on for a second. but checking the fuel pressure there is still none at the rail according to my gauge. The coils are getting nothing. Also the pump is getting 12 volts at cranking.
Customer reply replied 1 year ago
could it be a cps? that would effect the ignition but I still don't understand the fuel pressure issue. 12 volts at prim and pump runs and 12 volts at cranking.
Customer reply replied 1 year ago
ok, solved pump issue. system is pressurizing normally but now no fire/ignition
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 1 year ago

Ok. Did you check for codes? A bad crank sensor should have set a code.

Check voltage going to coils on Dark Green/Orange wire. If voltage OK, get a Noid Light (about $10 at most major auto parts stores) and check injector pulse. If voltage to coils and injectors OK, but no injector pulse and no ignition spark, replace crank sensor and retest.

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Customer reply replied 1 year ago
replaced cam position sensor. still no ignition. Crankshaft sensor?
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 1 year ago

Are you even reading my posts?

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Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 1 year ago

I'm sorry, but I don't have anything else to contribute. I'll opt out so others may try. Please do not reply until another expert responds.

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Customer reply replied 1 year ago
thank you
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 1 year ago

I appreciate you saying thank you, ***** ***** reply makes the site cycle your request back to me. Please do not reply until another expert responds.

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Dodge Mechanic: david craig, Auto Mechanic replied 1 year ago
david craig
david craig, Auto Mechanic
Category: Dodge
Satisfied Customers: 4,485
Experience: owner/mechanic at 3D Automotive
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Hi Im David, when you crank the vehicle, do you see the rpms jumping?

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Dodge Mechanic: david craig, Auto Mechanic replied 1 year ago

do you still need assistance?

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Dodge Mechanic: Chris, Shop Foreman replied 1 year ago
Chris
Chris, Shop Foreman
Category: Dodge
Satisfied Customers: 14,173
Experience: Dodge/Cummins and Chrysler Certified Master Tech
Verified

Hello, my name is ***** ***** after reading your posts, I am thinking you have a failed crankshaft position sensor. The pump comes on and the ASD supplies votage for a few seconds, so that tells me the PCM is probably ok. The PCM will not re energize the ASD unless it sees a valid crankshaft position sensor. At this point I recommend replacing the crank sensor. Do that and let me know if she will now start.

Chris

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Chris
Chris
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