I need some advice on a fuel injector problem

Tiny
DJRSUT
  • MEMBER
  • 2000 DODGE INTREPID
  • 117,000 MILES
I had been out a couple of times one day and the last time I went to run an errand my engine light came on. I read the code which was P0203. I have replaced the fuel injector, the pig tail, new spark plugs, checked the coils and I get the same code after clearing the code. Which either leads to the wiring or the computer. Both of which mean big bucks on my very limited income. A mechanic suggested that I find which injectors fired at the same time and piggy back the non firing injector to the good injector. So my question is. Which injector fires with the #3 injector? Any help you can give me is deeply appreciated. Thanks
Friday, October 5th, 2012 AT 1:32 AM

13 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The injectors for this system does not fire at the same tieme as they are individually controlled. However you can still piggyback eventhough system is thus, it just allow the injector to fire earlier and and make the engine run smoother but the MIL is not going to go off.

The computer could be expensive but if it is a wiring fault, it should not be. Locating a break in wiring between two points isn't that difficult to resolve.

Which engine do you have?
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Friday, October 5th, 2012 AT 2:00 AM
Tiny
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It's a 3.2 engine.
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Friday, October 5th, 2012 AT 2:13 AM
Tiny
KHLOW2008
  • MECHANIC
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Firing order is 1-4-3-6-2-5 so if you want to piggyback, connect it to #4.

Have you tested the wiring for cylinder # 3 for battery voltage and continuiyt between injector and PCM?
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Friday, October 5th, 2012 AT 2:29 AM
Tiny
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No, I haven't. I'm not good at electrical stuff. We are just backyard mechanics lol but we swapped coils and we know that the coils are good
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Friday, October 5th, 2012 AT 2:40 AM
Tiny
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We also tested the new injector by connecting it to a battery source and got a spray out of it
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Friday, October 5th, 2012 AT 2:47 AM
Tiny
KHLOW2008
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At the injector there are two wires. The Dark Green/Light Green wire must have battery voltage when ignition swith is turned on.

The other is a Yellow/White wire which is connected to the PCM, C1 harness connector terminal # 7.

Disconnect the harness connector and probe the terminal with one end of the multitester (set to ohms)and probe the other to the fuel injector Yellow/White, if you have continuity, the problem lies with the PCM.
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Friday, October 5th, 2012 AT 4:49 AM
Tiny
DJRSUT
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Thank you so much for your help! Sorry it took so long to reply, but just got home. Again thank you. And if you can think of anything else I would deeply appreciate it!
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Friday, October 5th, 2012 AT 8:20 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
So far the test for the wiring would be the first thing you need to do to confirm that this is not a bad wiring problem.
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Friday, October 5th, 2012 AT 8:35 PM
Tiny
DJRSUT
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Going to test it this weekend. Have to get an ohm's meter first. Hopefully it's in the wiring and I can just run new wire to the injector. If it's not the wiring then I am going to piggy back it until I can afford a new pcm or go to a junk yard and get one. Then i'll have to have it programmed.
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Friday, October 5th, 2012 AT 8:40 PM
Tiny
KHLOW2008
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Good luck.
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Friday, October 5th, 2012 AT 8:46 PM
Tiny
DJRSUT
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Thank you! One last question if you don't mind. All the pcm's on these vehicle have to be programmed, correct?
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Friday, October 5th, 2012 AT 8:48 PM
Tiny
KHLOW2008
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Yes, they must.
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Friday, October 5th, 2012 AT 9:06 PM
Tiny
DJRSUT
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Well, there is continuity. So now it's up to me to find someone that programs pcm's. I picked up a couple out of 2 wrecked intrepids.
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Sunday, October 7th, 2012 AT 2:30 AM

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