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I want to test run my ABS pump on my 02 z06. I currently have the EBCM off the car. I see the 2 wires that go to the pump, problem is their both black and I have no way of knowing which is positive and which is negative. With it being a D.C motor if the power leads are reversed the motor would just run in the opposite direction. Would that damage the pump in any way? I put a test light on the connectors where the pump plugs into with the ignition switch turned on trying to see which lead is my positive, and both connectors have zero power on them. Any help would be appreciated, thanks!
In my opinion the best way to exercise the ABS pump is to run the car on wet surface and activate the Active handling /ABS system .
Then you also active the solonoidvalves within the ABS unit .
I am not sure it is a good think to run a "dry" ABS pump if you have the pump out of the car .
I perform a Automated bleed with my Tech 2 when I replace my brake fluid .The Tech2 command pump on and open different solonidvalves during the Automated Test
The pump are running about 30sec on each wheel when I bleed the brakefluid from all wheels .
My car is a 2000 model with a different ABS unit but I think principles are similar
This guy with with the older version of the EBCTM (97-00) did exercise his unit when he got DTC C1243 .
He was able to exercise his pump ( who more or less stuck ) so the current draw was reduced from above 10A down to approx. 5 A.
If you don´t have this code I would not have exercised the pump with an external power supply at this moment if it was my car .
I would have driven my car and activated the tracking system and ABS on some wet grass in low speed or got me Tech2 clone to do this pump exercise.
I can’t activate the abs at the current moment cause I have c1242 code and the active handling, traction control and abs are all in-operative. I’ve removed the EBCM, opened it up and re-soldered the five places where the relay attaches to the board as well as the two larger ones right above it. Also looked over every solder joint on the board with a magnifying glass. Still getting the c1242 code. And yes I’ve double and triple checked all the grounds on it. I guess I need to buy and replace the relay on the circuit board next. I was wanting to exercise the abs pump, just to hear it run and rule that part out.
I can’t seem to find it now but I read how to apply 12 volts to the pump and run it for several seconds. My problem is I don’t know which wire is positive and which is negative. There both black in color.
The C1242 appear when the system voltage for solonoids and pump is getting too low .
This could be caused by several things .
Blown fuse , bad continuity on grounding points ( have you checked these ? )
Also the EBCTM relay is known to go bad . If nothing else works out you can try to replace this relay shown below.
If your ABS got stuck and the pump currentdraw got too high due too high friction in the pump you should have the DTC C1243 as far as I can understand the function of the DTC´s
Oelarse, I tried buying that relay from the link you posted, it says that it’s obsolete. Any other places you know that I could purchase this from? Thanks
The relay my friend bought for his car , ORWH-SH-112D1F ,( 10A single pole relay ) and I replaced in his EBCTM
should be available from several places . Here is a place in Canada and also on ebay
If you search with Google you should be able find a store within US with this relay on stock ( I live i Norway so I am not familiar these stores inside US )
I tested mine a couple of weeks ago when a SUV pulled out in front of me and stopped in the middle of the road.
I had a similar situation, a number of years ago, when a deer ran out in front of me. Since then, however, I've used the "lock-em-up" on wet grass method.....
Exercising ABS Pump
