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No power to coils or injectors

Tiny
GENEGM
  • MEMBER
  • 2004 CHRYSLER PACIFICA
  • 3.5L
  • 6 CYL
  • AUTOMATIC
  • 180,000 MILES
I bought the car barely running. I towed it home. Upon putting my scanner on it. It had four codes, cylinder 1, cylinder 3 injectors open circuits. Coil e cylinder 5, f cylinder 6 open circuit. I began by pulling the intake manifold to get to cylinders 2, 4, 6 unplugging all of the injector and coils, I turned on my multi-meter put negative probe to battery ground and probed the plugs on the coils and injectors. There is no power to either. Fuse # 37 25 amp for ASD keeps blowing when key is "on". I have tested the ASD relay and it is good. Replace the relay fuse. Still no power. Any ideas what to look for next?
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Monday, August 5th, 2019 AT 7:58 PM

11 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

The reason the ASD fuse keeps blowing is because there is a short to ground in the circuit that the ASD fuse is protecting. Replacing the fuse will not the problem, it will just blow again when the ignition key is turned to "on" again. In the diagrams down below I have included the wiring diagrams for the charging/starting circuits as well as the engine performance wiring diagrams for you. I have also included a guide for you on how to find short to grounds in an automotive electrical circuit. Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Tuesday, August 6th, 2019 AT 6:10 AM
Tiny
GENEGM
  • MEMBER
  • 6 POSTS
Thanks Alex. Those color coded diagrams do help a lot. I suppose I will start unplugging things and do a process of elimination. I will update you on my progress. Thank you again!
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Tuesday, August 6th, 2019 AT 10:47 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
SCWICKEDSTANG is one of our best! Use 2CarPros anytime, we are here to help. Please tell a friend.
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Thursday, August 8th, 2019 AT 12:31 PM
Tiny
GENEGM
  • MEMBER
  • 6 POSTS
So far I have not been able to locate the short. I pulled the plugs from the fuse box and ohms tested the circuit from the hot side of the ASD fuse to the pin output. 88 ohms of resistance. Am I on to something? It seems there should be almost zero resistance. My thought is, can I put a jumper wire to the brown/white wire and bypass the actual plug to avoid the fuse box if there is a problem with it?
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Thursday, August 8th, 2019 AT 12:50 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

It would just be easier to replace the ASD Relay. If you pull the relay out and look it will either be a 4 Pin or 5 Pin Relay. Either one is available at any auto parts store for $15.00 to $20.00. If you are referring to bypassing the fuse, I would not recommend this in the least. The fuse is put there as a circuit protection device. If you have a short to ground without fuse protection you can damage/destroy the component in the circuit, do spot welding where ground occurs, and risk an electrical fire that can destroy your whole vehicle. Please get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Thursday, August 8th, 2019 AT 5:18 PM
Tiny
GENEGM
  • MEMBER
  • 6 POSTS
Before the ASD fuse started blowing. The main issue I had was 1 and 3 injector had open circuits also number 5 and 6 cylinder coils had open circuits. What I forgot to mention previously was, I had noticed that someone had undone two ground wires, one went directly from battery to frame rail and another had been attached with a plug to front of engine. When I noticed these I reconnected them and that is when I lost all power to the injector and coil Coil circuits and fuse for ASD stated blowing. At this point, what I have done is replace the ASD relay. Still no power the coil/injectors. Still scratching my head.
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Friday, August 9th, 2019 AT 3:01 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
All grounds must be connected from the battery to the engine and to the frame/body of the car. This sounds like the TIPM is bad which is common. Here is a guide to help replace it which is easy because it self initiates. Check out the diagrams (below). Please let us know what happens.
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Friday, August 9th, 2019 AT 5:33 PM
Tiny
GENEGM
  • MEMBER
  • 6 POSTS
I ohms tested the asd fuse to pinout and it has 88 ohms of resistance.
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Friday, August 9th, 2019 AT 6:02 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Not sure what you are saying? The fuse has 88 ohms or the circuit? Can you please shoot a quick video with your phone so we can see what's going on? That would be great. You can upload it here with your response.
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Saturday, August 10th, 2019 AT 11:29 AM
Tiny
GENEGM
  • MEMBER
  • 6 POSTS
The circuit" from the fuse terminal to the pinout. There is 88 ohms of resistance.
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Saturday, August 10th, 2019 AT 1:10 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
A straight circuit should have no resistance, it sounds like you found the problem. Can you circle the circuit on the wiring diagrams and post it so we can see?
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Monday, August 12th, 2019 AT 10:25 AM

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