'04 GS Blowing 20a fuse for A/T control relay, could it be the shift solenoids?

274 Views 6 Replies 2 Participants Last post by DarkRider2k3, 2 mo ago

DarkRider2k3

Discussion Starter · 3 mo ago

Hey everyone! I have an '04 Eclipse GS (2.4 AT sport) that is consistently blowing the 20a fuse every time I throw it into drive. I'm getting a P1751 but also getting conflicting information about if the shift solenoids could cause the 20a fuse to blow if they are bad. Let me explain what I've done so far:

1. Disconnected harnesses at PCM (C-57 and C-54 respectively), removed relay and confirmed no short to ground (0V measured) on Pin 4 of the A/T control relay
2. Cleaned ground that was slightly corroded but otherwise in good condition, verified ground at relay.
3. Measured solenoids at the following:

Pin 9 + 3: 3.7 Ohm
Pin 9 + 4: 3.4 Ohm
Pin 9 + 5: 3.5 Ohm
Pin 10 + 7: 3.4 Ohm
Pin 10 + 6: 3.4 Ohm

I do feel like I may need to re-run my tests as they all seemed to be on the high side, with 2 of them showing above normal values. But can the solenoids potentially being bad cause the blown fuse?

Just needing help trying to figure out why this is happening. Thanks everyone!!!

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Bitter

· #2 · 2 mo ago

Look for somewhere the wire harness is contacting ground, likely due to the engine shifting when being placed in drive. Pay close attention to sharp metal edges, brackets, braces, etc. It sounds like you have a non static problem so testing when things are sitting still won't show it and testing when the car is in gear is pretty difficult.

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DarkRider2k3

Discussion Starter · #3 · 2 mo ago

Bitter said:
Look for somewhere the wire harness is contacting ground, likely due to the engine shifting when being placed in drive. Pay close attention to sharp metal edges, brackets, braces, etc. It sounds like you have a non static problem so testing when things are sitting still won't show it and testing when the car is in gear is pretty difficult.

Hey! Thanks for the tip! I should have updated this post but was incredibly busy the past 2 days. I actually found my problem on Sunday:

The problem ended up being a short to ground on the wire from the A/T relay to the transmission harness. Where the harness wraps around the side of the engine (by the thermostat) the plastic that holds it in place had broken and caused the harness to snag, rubbing against the thermostat and causing a short. You are correct in that it sitting still was not causing the short and wasn't easily detectable.

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Bitter

· #4 · 2 mo ago

Good find and thank you for posting your solution to help others.

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DarkRider2k3

Discussion Starter · #5 · 2 mo ago

Bitter said:
Good find and thank you for posting your solution to help others.

Oh of course! I definitely want to post it! This is definitely an area I could see as a problem for others, especially as our cars age and that plastic eventually gets brittle. I'm going to actually look for a replacement for it or see if I can make my own.

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Bitter

· #6 · 2 mo ago

DarkRider2k3 said:
Oh of course! I definitely want to post it! This is definitely an area I could see as a problem for others, especially as our cars age and that plastic eventually gets brittle. I'm going to actually look for a replacement for it or see if I can make my own.

ISPINNER 52pcs Cable Clamps Assortment Kit, 304 Stainless Steel Rubber Cushion Pipe Clamps in 6 Sizes 1/4" 5/16" 3/8" 1/2" 5/8" 3/4" - - Amazon.com

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I've been using these as I've been building some stuff on a car, work well to secure things to things generally. Sometimes getting the tab holes to line back up after stretching them around something can be a little awkward.

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DarkRider2k3

Discussion Starter · #7 · 2 mo ago

Bitter said:
ISPINNER 52pcs Cable Clamps Assortment Kit, 304 Stainless Steel Rubber Cushion Pipe Clamps in 6 Sizes 1/4" 5/16" 3/8" 1/2" 5/8" 3/4" - - Amazon.com

ISPINNER 52pcs Cable Clamps Assortment Kit, 304 Stainless Steel Rubber Cushion Pipe Clamps in 6 Sizes 1/4" 5/16" 3/8" 1/2" 5/8" 3/4" - - Amazon.com

www.amazon.com

I've been using these as I've been building some stuff on a car, work well to secure things to things generally. Sometimes getting the tab holes to line back up after stretching them around something can be a little awkward.

Those would actually work incredibly well for the front side (near the camshaft position sensor). I'm going to look into that!

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