2003 Dodge Ram Crank but no start

Tiny
CHRISISBELL619
  • MEMBER
  • 2003 DODGE RAM
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I'm looking at a truck that will crank but not start I checked the fuses at the power distribution box and the ecm/skim fuse 9 was blown after putting a new fuse in to blew instantly how do I trace this problem down?
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Sunday, October 11th, 2015 AT 8:38 AM

8 Replies

Tiny
HMAC300
  • EXPERT
Fuse 9 is a red/wht wire that goes to ignition switch, that either has a short, the ignition switch is doing it or from there it goes to power window circuit which is a dark blue wire that goes to circuit breaker for power windows
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Sunday, October 11th, 2015 AT 8:55 AM
Tiny
CHRISISBELL619
  • MEMBER
I'm sorry my fault I meant fuse 19 its the ecm/skim fuse correct?
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Sunday, October 11th, 2015 AT 1:16 PM
Tiny
HMAC300
  • EXPERT
Yes I kindof thought 19 is what youwere talking about but not sure. Fuse 19 is the red wire that powers the ecm. Best thing to do here is to unplug the ecm and check pin 29 for power. It may be a bad ecm which you should have a pro check because he will have to program the security in it as it won't start even if you replace it. If the fuse still blows then its' a wire issue otherwise it could be something else besides ecm causing the problem
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Sunday, October 11th, 2015 AT 4:46 PM
Tiny
CHRISISBELL619
  • MEMBER
I unplugged the ecm all three big connectors on pads nger side fire wall circuit still has a direct path to ground can you tell me which harness to look at please thx
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Monday, October 12th, 2015 AT 9:45 AM
Tiny
HMAC300
  • EXPERT
I did in last reply told you color of wire and pin number they are marked on plastic as well as wire color.
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Monday, October 12th, 2015 AT 11:56 AM
Tiny
CHRISISBELL619
  • MEMBER
My apologies sir thank u for your help I double checked and found that with the three main harness unplugged the fuse did not blow it blew as soon as I plugged in the bottom connector is it possible that a circuit on the output side of pcm could cause this and not the pcm or is this a good indication of an internal short in the pcm? Is there a procedure for verifying the pcm is bad I'm pretty cappable of testing and understanding circuits I can't find the appropriate wirring diagrams on the web
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Monday, October 12th, 2015 AT 12:45 PM
Tiny
CHRISISBELL619
  • MEMBER
P.S. I'm aware of the skim and skreem modules and their roles in locking the run/ign circuit apparently they have been bypassed this truck was running without the magnetic key for a long time
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Monday, October 12th, 2015 AT 12:51 PM
Tiny
HMAC300
  • EXPERT
Your truck has a transponder key with a module it could be an ecm and if it is near water intrusion it very well may be the ecm. I always send people to their local mechanic for a pcm to have him check it out as he needs to install the security for your vehicle as they are vin specific. It cold be something else beside pcm as well however like another harness shorting out. Pcm's are rebuild able as I've had one in my truck for the past few years and is good. You can try installing it yourself but if it doesn't start you'll have to have it programmed by a garage that has a scanner. To see if it's ecm leave one of the connectors disconnected and plug in one that blows the fuse if it does it then, then it is kind of the ecm at fault i'd think.
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Monday, October 12th, 2015 AT 1:17 PM

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