Extreme Terrain
4x4Wire Trail Talk Forums: Jeep, Toyota, Mitsubishi, Pajero, Isuzu, Kia, 4WD, 4x4, SUV, Off-Road and OutdoorWire Forums


Search

Recent Posts on TrailTalk
Gen 2 UCA extended upper ball joints?
by Colombia - 05/24/22 03:28 AM
Blown Head Gasket - could use advice
by Runner-Man - 05/23/22 01:58 AM
Florida Mitsubishi 4X4 Fall Crawl 2022
by Mudraider - 05/16/22 04:50 PM
OG folks chime in!
by OldColt - 05/10/22 10:55 PM
RPM's fluctuate when turn signals/lights are on.
by Mudraider - 05/08/22 01:17 AM
the cold start shuffle got me
by Mudraider - 05/03/22 07:20 PM
Support 4x4Wire
New Topics on TrailTalk
Gen 2 UCA extended upper ball joints?
by Colombia - 05/24/22 03:28 AM
Blown Head Gasket - could use advice
by Runner-Man - 05/23/22 01:58 AM
Florida Mitsubishi 4X4 Fall Crawl 2022
by Mudraider - 05/16/22 04:50 PM
RPM's fluctuate when turn signals/lights are on.
by LarryJo - 04/30/22 04:40 PM
FS: 500,000 mile 2003 Toyota Sequoia SR5 4X4
by atikovi - 04/29/22 03:56 AM
Check Engine Light Throttle Position Sensor:
by nvmonty - 04/28/22 04:34 AM
4x4 Gallery
Photos of rig
Attila
99 Monterrible Sport
Scar the Cylon Raider
Mercenary Sergeant: Code Name "Sapphire"
More News on the 'Wire

4x4Voice
4x4Wire
MUIRNet-News
OutdoorWire
Who's Online Now
0 registered members (), 86 guests, and 4 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums37
Topics138,274
Posts1,081,733
Members15,265
Most Online907
Dec 28th, 2019
Previous Thread
Next Thread
Print Thread
Rate Thread
EFI , slow battery drain #760877 10/26/06 05:08 PM
Joined: Nov 2005
Posts: 65
Bent_85 Offline OP
Getting the Wheeling Fever
Hi all, I got a new to me truck, an 87 22RE 4by. The truck was running intermittently when I bought it. When I replaced the pick up coil in the distributor it now runs great. I bought it with an extra battery, which should have been a clue to me. I have found it has a slow electrical drain somewhere in the EFI system (I think). Using a ammeter I can see no drain when I unplug the computer or when I unplug the air flow meter. (I have replaced the computer with another and have the same result.) I also see no drain when I unplug the pink fuse in the black fuse box just back from the battery. My questions are what systems does the pink fuse cover? And why would the truck run great if the computer or the air flow box had a slight short in them?

Thanks for any suggestions.

Last edited by Bent_Ski; 10/26/06 05:14 PM.
From the Off-Road World
Re: EFI , slow battery drain [Re: Bent_85] #760878 10/26/06 05:41 PM
Joined: Oct 2002
Posts: 153
Frank Torres Offline
Wheeler
A shot in the dark...
There is one relay EFI relay or Open Circuit relay. Maybe it is stuck closed, this will drain your battery over 1 or 2 days. Or maybe someone bypassed a relay.
Check all of you relays, there are a few under your dash rt side.
You should be hearing relays 'click' as you turn the key to ON

good luck hopes this helps...


1991 FJ 80 Land Cruiser for fun.
1998 GS300 for the wife
1998 GS400 for me
1991 Supra SOLD
1986 4Runner 335k miles-22re EB inside.SOLD
Re: EFI , slow battery drain [Re: Frank Torres] #760879 10/26/06 05:56 PM
Joined: Nov 2005
Posts: 65
Bent_85 Offline OP
Getting the Wheeling Fever
Thanks Frank,
I'll check out the relays. Is the circuit opening relay the black one above the computer on the right side?


91 Toy 4x4 V6
85 Toy 4x4 22R
Re: EFI , slow battery drain [Re: Bent_85] #760880 10/26/06 06:03 PM
Joined: Jan 2000
Posts: 12,153
4Crawler Offline
Web Wheeler
*****
Quote
Thanks Frank,
I'll check out the relays. Is the circuit opening relay the black one above the computer on the right side?


Yes, it is up there someplace. How much current drain are you seeing? It is normal to see something in the 10-20mA range for clocks, ECU and radio memory backup, etc.

Re: EFI , slow battery drain [Re: 4Crawler] #760881 10/26/06 09:31 PM
Joined: Oct 2000
Posts: 669
D
dcg9381 Offline
Rock Warrior
4crawler is absolutely correct.. You're going to see some drain. The way I wire megasquirt, there isn't any current to the ECU itself when the key is off and I believe the OEM ecu is the same, but don't discount that there isn't current going somewhere else - like to the OEM clock or aftermarket radio.

You really need an amp meter to figure out HOW much current you're drawing.

I need a pin out of the stock ECU to help you and my server seems to be down.. There are two pins on the stock ECU that get relay power - both should NOT provide 12v when the key is OFF.

If it's AFM related, my guess is that you're triggering fuel pump - maybe...


22REturbo.net




1988 4Runner
22RTE core, turbocharged, megasquirted...
Re: EFI , slow battery drain [Re: dcg9381] #760882 10/27/06 05:17 AM
Joined: Nov 2005
Posts: 65
Bent_85 Offline OP
Getting the Wheeling Fever
Thanks guys, found it!

I retrieved my dusty amp meter and went through the EFI system like you suggested.

I assumed it was in the EFI system because when I had first got the truck I was trying to make the truck run as it was running intermittently. At that time with the air flow meter plugged in the drain was 340mA. Unplugging the air flow meter the drain dropped to 300mA. This time I basically unplugged everything in the engine compartment trying to chase down a 300mA drain. From injectors to the to the wiper motor. After unplugging the fuel pump motor I went back around the front and found one more plug just below the air box. A 4 prong plug with white wires. After disconnecting this - no drain. Those wires went led to the fuse/relay behind the drivers side kick panel. Evidently the area was damp I think because the body seam above is rusty. It turned out to be the round relay below the 4 way flasher relay. I replaced the relay with another used one.

Now my battery drain is about 10.5mA. This should be OK right?
Thanks again <img src="/forums/images/graemlins/cheers.gif" alt="" />

Last edited by Bent_Ski; 10/27/06 04:10 PM.
Re: EFI , slow battery drain [Re: Bent_85] #760883 10/28/06 02:37 AM
Joined: Jan 2000
Posts: 12,153
4Crawler Offline
Web Wheeler
*****
10mA is pretty good, that would drain about 1 amp-hour of the battery every 4 days or so, so given a decent 40AH battery, you would be good sitting for many months.

Re: EFI , slow battery drain [Re: 4Crawler] #760884 11/03/06 04:43 PM
Joined: Jan 2006
Posts: 32
Jickle Offline
Getting the Wheeling Fever
Ok, I was curious about this whole battery drain thing. (I never have had a problem with my battery or alternator but just wanted to check) I found out I have a 31 mA drain. The previous guy had, what a 10 mA drain. I wonder if I should even worry about this 31 mA drain?


stock 92 pickup, v6, xtra cab, 4x4 IFS, 204k miles
Re: EFI , slow battery drain [Re: Jickle] #760885 11/03/06 04:48 PM
Joined: Jan 2000
Posts: 12,153
4Crawler Offline
Web Wheeler
*****
That is about the upper limit of what is normal. You'll be draining 0.75 amp-hours/day out of your battery, it would prabably kill the battery in 1-2 months if not run, but if you drive it frequently, probably not a big deal.


Moderated by  4Crawler, 4x4Wire, kewlynx 







4x4Wire Social:

| 4x4Wire on FaceBook |


OutdoorWire, 4x4Wire, JeepWire, TrailTalk, MUIRNet-News, and 4x4Voice are all trademarks and publications of OutdoorWire, Inc. and MUIRNet Consulting.
Copyright (c) 1999-2019 OutdoorWire, Inc and MUIRNet Consulting - All Rights Reserved, no part of this publication may be reproduced in any form without express written permission
You may link freely to this site, but no further use is allowed without the express written permission of the owner of this material.
All corporate trademarks are the property of their respective owners.

Powered by UBB.threads™ PHP Forum Software 7.7.3
(Release build 20190728)
PHP: 7.4.29 Page Time: 0.027s Queries: 15 (0.009s) Memory: 2.8999 MB (Peak: 3.1928 MB) Data Comp: Off Server Time: 2022-05-26 02:25:46 UTC
Valid HTML 5 and Valid CSS