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Old 04-27-2019, 09:39 AM   #1
frd909
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IG2 fuse keeps blowing at On position

I have a 2000 GT-S that died on me a few days ago. I was coming to a stop and it just shut off and would not turn back on. Got it towed home and saw the IG2 fuse blown. I swapped it out 2-3 times to be sure but as soon as the key is on the on position it blows. The car cranks fine but doesn't turn on. I sprayed some starting fluid on the intake and it did run for a few seconds.

Any ideas?
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Old 04-27-2019, 11:13 AM   #2
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You need to track down what devices it powers and check them for short circuits and inspect the wiring harness for damage. My 2000 GTS had some insulation under/next to the battery tray that was damaged that I repaired with liquid tape, there was some very thin insulation with a tiny bit of bare copper showing in a few spots on a small section of wire, may have been mouse damaged in the past.
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Old 04-27-2019, 01:23 PM   #3
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IG2 feeds the injectors & coil packs.
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Old 04-28-2019, 06:04 PM   #4
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I removed the connectors for all 4 injectors and coil packs and the fuse still fries. When I remove the IG2 relay the fuse doesn't blow but I'm not quite sure what that means 🙂. I tried swapping the relay with the horn relay but that didn't help. Am I looking at a grounding issue? I don't see any obvious exposed copper.
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Old 04-29-2019, 02:05 PM   #5
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If the fuse holds with the relay removed, it means the issue lies beyond the relay. It is not likely a relay issue. If it blew with all the injectors & coil packs disconnected, you likely have a wire shorting to ground somewhere between those & the relay. You'll have to lift out the relay panel/fuse box & see what things look like underneath. The only other thing connected is the condenser/capacitor/noise filter to reduce inj/coil electrical noise (which I think is also located under the fuse panel).
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Old 05-01-2019, 08:38 AM   #6
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Thanks for your help so far. I found this wire disconnected, any idea where the other end would connect to?

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Old 05-01-2019, 12:20 PM   #7
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Offhand, I do not. It might possibly be for the noise filter. Although, it appears to be in the loom for the DRL resistor. If you trace it back, I might be able to tell you more. Note, however, that all the leads coming from the IG2 relay are Black.
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Old 05-01-2019, 03:27 PM   #8
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There is that resistor at the left of the picture. 2 wires are coming off of it, one is white which is grounded, and the other is this black one which branches off of the loom. So right now, this resistor is not connected to anything. I'm guessing that's not the noise filter and just the DRL resistor?
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Old 05-02-2019, 07:26 AM   #9
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My guess is yes. That appears to be the DRL resistor. I don't see Black being used in any of the DRL schematics. However, you have a 2000 and would've gotten the DRL resistor under a recall and the kit may have used Black.

Here are the details: https://static.nhtsa.gov/odi/rcl/200...4V566-8928.PDF


Note: While the schematic calls out the Noise Filter, I have been unable to find it listed on any parts list.

Last edited by 2way; 05-02-2019 at 07:32 AM..
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Old 05-10-2019, 09:48 AM   #10
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I've not had any luck finding the short yet

Any tips on how to locate a possible short in the wires? Would something like this work:

https://www.amazon.com/Automotive-Tr...gateway&sr=8-3

Or am I better off replacing the harness?
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Old 05-10-2019, 07:12 PM   #11
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Yes but not that one, it's not made to find shorts really. Short finders are expensive but less than a whole harness and labor would cost. You'll need to remove the battery and tray and get at the harness and have a good look for rub through areas.
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Old 05-12-2019, 08:46 AM   #12
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it's not made to find shorts really
Yeah, that's more useful as a broken wire finder.

Underneath the engine fusebox you should find a gray 32pin connector (2C). The black wires from the IG2 relay should all be in the middle section of the connector - Pins 7 thru 11 & 23 thru 26. Disconnect the connector from the fusebox & measure resistance to ground with an ohmmeter on each of those pins to identify the shorted wire. Once found, trace that wire.

Relay Locations.pdf
Page 23
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Old 05-13-2019, 04:48 AM   #13
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This is a head scratcher...I was able to start the car with ether (albeit really rough and for just 10 seconds) even with the fuse blown. I will check the IG2 wires, but at the same time, how do I test to make sure fuel is being pumped. I can't hear a whine when I switch the car on.
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Old 05-13-2019, 10:32 AM   #14
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Sounds like you've got some bad issue with power feedback from other circuits Or it's not the IG2 fuse blown.
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1998 Mazda 626 FS-DE/CD4E 'mom-mobile'
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I'm gay
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no, don't even waste your time. if you want a honest sticker, at least get one that says "objects in mirror aren't really racing, so quit trying"...
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