2002 mustang no crank - Ford Mustang Forum
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post #1 of 4 (permalink) Old 10-12-2019 Thread Starter
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2002 mustang no crank

I've got a 2002 mustang vert that has been having a no crank problem, this started I want to say around Jan of this year. It ran and cranked just fine, I parked her in the garage to work on the speakers because the speakers didn't work so I thought I'd look at the amps first, I pulled the back seat out and found that both the amps were unplugged, so I plugged them in, then turned the key over and nothing. no cranking and the speakers still didn't work (carfax reports flood damage from 06 but nothing has been an issue, but due to the report I assume the amps were blown/water damaged?) I figured out that if turn the key to run and you put a paper clip in the pins for the starter relay it would crank, but she still didn't start, so I waited till it got warmer so in June I pushed her out and figured I'd replace the fuel pump just to see since I couldn't hear the fuel pump prime, and after replacing the pump and filter and then putting a clip in the pins she started again, she still runs and drives but still has to be started from the relay pins. I've figured when I plugged in the blown amps that it shorted something out and blew the fuel pump and something else causing the ignition to not crank, I've pulled out the ignition switch and pressed it all the way to see if it went bad and still nothing, it's getting old to have to pop the hood to start the car anytime I want to drive it. Anyone have any ideas on what could be causing the no crank? I should also mention that the amps were unplugged the second that there was no crank and hasn't been plugged back in since. Thanks! - Matt

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post #2 of 4 (permalink) Old 10-12-2019
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Test for power in and out of fuse F1.3

Test for power in and out of fuse F2.6 with the key in the "start" position.

Best to use a test light that will "load" the circuit.

The trouble shooting of the neutral safety circuit (NSS) next step depends upon the test results.

Is this a manual or automatic?

1999-2004 MY fuse panel schedule:
https://www.allfordmustangs.com/foru...ml#post2669271

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post #3 of 4 (permalink) Old 10-13-2019 Thread Starter
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It's an automatic, but in the link you had there, it said that the mileage will show something and that means the pcm is working, sometimes the mileage doesn't always come up, could this be a pcm issue? I also forgot to mention that I replaced the NSS
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post #4 of 4 (permalink) Old 10-13-2019
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I can't help you without the requested test results. I'm a big believer in starting with the "basics" and then working up. You may have replaced the NSS switch but it won't make any difference IF there's no power in the starter NSS pilot duty circuit in the first place.

There is a difference between the cluster not displaying a mileage at all or displaying all dashes ("-------")

I highly encourage you to test for basic power items before "assuming" that there's a bad PCM.

Refer to the following link.

1996+ Crank with no start check list
https://www.allfordmustangs.com/foru...e.html#2984838

Pay attention to what the theft light is supposed to do at initial key on.
Pay attention to the part about what the check engine light is supposed to do during cranking.
Pay special attention to the part about testing for key on power in/out of fuse F2.34, F2.2, and F2.8.

If this car has had water damage then you need to learn about voltage drop testing as weak electrical connections might be at the heart of your issue.

Howto perform charging system voltage drop test
https://www.stangnet.com/mustang-for...-drop-test.56/

Here's another link that might help with a cluster problem.

My odometer goes on and off?
https://www.allfordmustangs.com/foru...f.html#2657361

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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