Parasitic battery drain injector circuit - Kia Forum

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post #1 of 12 (permalink) Old 05-06-2019, 12:29 PM Thread Starter
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Question Parasitic battery drain injector circuit

I have spent a lot of time trying to google issues I have had with this car. I am glad I finally found a forum that supports these great little cars. I am hoping there are some experts on here who have seen this issue before or certainly people that have more expertise in how these systems work. My back ground is computer science but I have been fixing my own cars since I was 16, about 30 years now. I have been lucky to not have to many issues with any of the electronic controls systems on my vehicles but I am slowly learning how they work in finer detail. So on to the current issue. I have a 2002 Kia Sportage. It has a battery drain that can drain the battery pretty quickly. A constant .5 current draw. I have been doing the tests to locate the battery drain and one of the circuits that seems to have a .3 amp current draw with the key off is the Injector circuit. When I pull the 30 amp Injector fuse the current draw drops to .2. My question is, what should I check next to try to isolate what is causing this current draw in the injector circuit. Could a shorted injector cause an issue like this? There are no service codes that are posted and the car will run as long as I keep the battery charged. When the engine is running the alternator is functioning correctly and putting about about 13-14 volts. The only performance issue I have noted is a little stumble off of idle other than that it seems to run good. I am a little at a loss here. Any suggestions?

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post #2 of 12 (permalink) Old 05-06-2019, 02:25 PM
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Have you pulled one fuse at a time, pull and reinstall, to see if the 5A draw is gone. That includes the fuse block under the dash. Should be no higher than 25ma draw. Also, how do you have your meter setup @ the battery?

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post #3 of 12 (permalink) Old 05-06-2019, 06:56 PM Thread Starter
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I am using a clamp meter on the positive battery cable. When I pull the 30A Inj fuse the amp draw drops from .5A to .2A. I haven't pulled all the fuses in the inside panel yet as. What other circuit could cause that much current draw through the injectors with the key off?
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post #4 of 12 (permalink) Old 05-06-2019, 07:47 PM
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I'm assuming 500ma, to 200ma. I'm used to disconnecting the negative battery cable and connecting the meter between the cable and battery and setting my meter on ma scale. You will have pull one fuse at a time till draw drops to around 25 to 35ma. You make have more than one thing causing the draw. Also try disconnecting the alternator and see if it has a draw being it's not fused. I have had to replace more than one thing because both components had a draw killing the battery. A shorted ground wire can also keep a component powered up that is usually turned on by a relay. Also disconnect any relays cause if it stuck on, it will keep something powered up. Sorry so long but I work on a lot of autos with your type of problem.

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post #5 of 12 (permalink) Old 05-06-2019, 07:50 PM
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Forgot to add that when you pull a fuse with a lot of draw, leave it out and keep going til the draw drops to stated draw level, 30 to 25 ma, milliamp.

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post #6 of 12 (permalink) Old 05-10-2019, 11:32 AM Thread Starter
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I went through last night and double checked my findings from before. I even went with a more accurate multi meter inline. I am getting a definite 250mA draw through the Inj circuit with the key off. After pulling that fuse, there is only a 10ma draw which is expected through the memory circuit. I pulled the memory fuse just to be sure and the current draw dropped to 0. I need to figure out why there would be current flowing through that circuit with the key off. I have no clue where to start.
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post #7 of 12 (permalink) Old 05-10-2019, 12:17 PM
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This is what that fuse goes to

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post #8 of 12 (permalink) Old 05-10-2019, 12:20 PM
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Here's a better one

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post #9 of 12 (permalink) Old 05-12-2019, 12:46 PM Thread Starter
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Steve_Sidwell, I like those diagrams better than the ones that I have been able to find on the internet or in the 2000 model service manual. Seem to be much easier to follow. Is this an app you paid for or is this something that is available to everyday DIYers.
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post #10 of 12 (permalink) Old 05-12-2019, 01:11 PM
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It's a service we pay for at our dealership, we sale GM autos and occasionally work on other makes.

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