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Help: ABS Pump keeps running after i shut off car

Old 04-06-2010, 09:33 PM
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halfrice
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Default Help: ABS Pump keeps running after i shut off car

So problem just started today, was able to source the location of the noise to the ABS pump, sounds like a vibrator after i turn the car off. Anyone know why? Gonna try bleeding the brakes, hopefully just an air bubble i missed thanks
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Old 04-06-2010, 09:40 PM
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what u got done to car?
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Old 04-06-2010, 10:55 PM
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cars mostly stock, only think i can think of that might affect it would be an aftermarket steering wheel, homelink mirror, and spliced some tailight wires for a trailer hitch
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Old 04-07-2010, 01:59 AM
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Can you tell if it's running when you're just driving around? The system gets tested every time you start the car when the car starts moving forward. You can feel/hear the whirring for a couple seconds.

How long does it continue to run after the car is off?

There is a connection between the stop light switch and the ABS control unit, so the added wiring may have some effect. See what happens when you disconnect it.
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Old 04-07-2010, 06:33 AM
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Disconnect it and see if it still goes.

Check if you left your vibrator on the ON position as well :-D
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Old 04-07-2010, 09:03 AM
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went to go unplug the wire this morning and looks like abs pump has been turning on randomly overnight as the pump is now hot and almost burned my hand, dc battery right now to let it cool before i can mess with it now.
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Old 04-07-2010, 09:49 AM
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its disconnected now and no longer turns on, would it be safe to drive my car like that for now?
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Old 04-07-2010, 12:23 PM
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ill take that as a no, took the car for a test drive, speedo doesnt work, fuel meter fluctuates, and power steering turns off randomly
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Old 04-07-2010, 12:27 PM
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Check your speed sensors that are on your differential axles. Get under the car and disconnect the wire that goes to the sensors on the axle stubs (on either side of the pumpkin). The sensor controls just your abs so when you disconnect it so your abs light should come on and you should have no abs. Everything else will work like your speedo and meters. Should be temporary fix.
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Old 04-07-2010, 12:28 PM
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Dont let the abs keep running or else you'll blow it eventually.
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Old 04-07-2010, 05:50 PM
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abs is dc until i can figure out some more stuff, the abs light never comes on, you can just hear the abs still running after the car shuts off, gonna check the abs sensors on the hub next.
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Old 04-08-2010, 10:37 AM
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does anyone know where the abs grounds itself? starting to think it may be a loose ground
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Old 04-21-2010, 07:29 PM
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It's definitely a grounding problem. I tried to hack my ABS unit so I'm familiar circuitry. Probably internal to the ABS unit. I rock my Z with the ABS completely disabled no problems. There is a wire under the fuse box you can cut if you want to permanently disable it. Other wise your looking at a new ABS unit.
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Old 06-03-2010, 12:41 PM
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I have the same problem with my abs now and does same thing with speedometer and fuel meter did u fix it????
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Old 07-08-2010, 11:20 PM
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This is obviously a common problem. I am having the same exact issue myself...and still trying to find the source of the problems with no luck... I also disconected the abs temporarily and now have a check engine light as well from it, but I'm tired of no speedometer.


Any new info as to what could be causing it?
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Old 07-09-2010, 11:29 PM
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nothing?
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Old 07-12-2010, 03:17 AM
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I went to dealer and told me its abs pump is fried and they want 1800 for it told them no so i went and bought one myself off a crashed z same model as mine for 100 bucks. It stop the buzzing sound but speedometer dont work and all light are still on dash.
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Old 07-12-2010, 05:03 PM
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I've been having the same problem with mine for a few months. After checking the speed sensors, testing the connections with a meter, and completely flushing the fluid, the pump still runs. I ended up cutting the fusible link. That let me have speedo but cut power to the ABS module and pump.

Yesterday after removing the control module (which was a major PITA), I found that brake fluid had somehow seeped into the module and shorted it out. No idea how that happened since the screws on the module were never so much as loosened to my knowledge.

Now I'm in the market for a salvaged unit b/c there's no way I'm paying $1500 for a new one. I believe the ABS control modules are specific to the model you have, depending on whether or not you have VDC/TCS. I need one off a 2006 coupe w/TCS. Anyone got one for sale?

Last edited by keichi59; 07-12-2010 at 05:05 PM.
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Old 07-13-2010, 01:24 PM
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What fusible link did u cut id like to have my speedo back till i have money for abother pump.
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Old 07-14-2010, 11:22 PM
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In your engine compartment fuse block, locate the pink fusible link block next to the horn relay. There should be two 30A and one 40A fusible links in that block. Remove the fusible link block and cut the two 30A fusible links (disconnecting your battery is a good idea). This cuts the power to the ABS motor and solenoids. Make sure you cut them to leave enough of a gap to prevent any arcing.

And again, this is dependent on what model and possibly what year you have. I have a 2006 with ABS and TCS. I believe the procedure for base models is the same but for models with ABS, TCS, and VDC, you should cut the 50A and 30A fusible links (but don't take my word for it, check your service manual).

PM me for pictures.
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