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Re: pulling ABS codes on a 97 Aero Posted by sam96CS [Email]  (#852) [Profile/Gallery]
(more from sam96CS) on Tue, 20 Aug 2013 06:42:40
In Reply to: pulling ABS codes on a 97 Aero, skibumm100  [Profile/Gallery]
, Mon, 19 Aug 2013 20:20:58
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You can't pull ABS codes from the OBD2 port. The ECU and the ABS controller are independent systems.
You can test the integrity of each sensor and its harness with a multi tester, and this should be done before you do anything else. The testing is done on the electrical harness that is attached to the ABS controller. You do NOT test the pins on the controller.
ABS Module location: Left side front, under the hood, under the plastic panel that covers the aquarium. The engine ECU and the ABS module are mounted side by side, with the ABS module located in front of the engine ECU. There is no need to remove the ABS module. In late model 9k (true at least for '96 - '98) the connection is made by means of a large "harmonica" harness attached to the top of the ABS module.
Test the electrical resistance of each pair of pins that correspond with the sensors. They're numbered like this:
Left Front sensor - pins 30, 48
Right Front sensor - pins 29, 47
Left Rear sensor - pins 28, 46
Right Rear sensor - pins 27, 45
What you want is a reading of 1100 ohms, +- 100 ohms, in other words a reading between 1000 and 1200 ohms.
The pin numbers are NOT noted on the harness. They are noted on the ABS controller, stamped on the black plastic near the pins in corners of the rows of pins. It helps to have a magnifying glass and flashlight to see the pin numbers if your eyes aren't as young as they used to be.
Beware the harness connection is not user friendly. It has a metal lever-type latch. Pry the latch with a screwdriver to disconnect. Swing it until it stops against the top of the ABS module. Now you can lift free the connector end closest to the lever followed by the connector end closest to the fender. Reconnecting is hard to figure out. If you have to use a lot of force, then you are doing it wrong. Here are the reconnection steps:
1. Begin with the lever in the wide open position - it is swung about 180 degrees from its closed position and lying on top of the ABS module. Make sure it is lying on top and not elevated at all.
2. The end of the harness connector that is closest to the fender must be fully engaged with two metal hooks.
3. Having engaged the hooks, push the front of the connector down (it will engage the pins on the lever automatically) until it snaps and travels another 1/4" or so - this doesn't require much force.
4. Now the lever will swing easily and lock the connector down. Note: You will never get it to go on by engaging the lever pins first. Don't even try.
In the process of testing the pins at the controller you will have reseated the harness. There are other sensor connectors you can reseat, although I would not mess with them if they have acceptable ohm readings at the harness. The front connectors are easy to find, located at the ends of the aquarium. The left front connector is strapped to a large bundle of wires. The right front connector is concealed inside a white foam wrap located near the A/C's shiny pipes on the right (passenger) side.
Connections to the rear sensors are harder to reach, but you can do it. The rear two are under the rear seats, beneath the floor under a foam insert. I can't tell you step by step how to reach them because I've never done it.
TML found additional ways to test the sensors and the ABS controller on a '96 Aero that should work just as well on a '97. See the thread linked below.
->Posting last edited on Tue, 20 Aug 2013 06:45:13.
, Mon, 19 Aug 2013 20:20:58, Tue, 20 Aug 2013 07:02:15, Sat, 24 Aug 2013 16:53:58, Sun, 25 Aug 2013 18:54:05, Mon, 26 Aug 2013 19:46:48, Sun, 1 Sep 2013 19:30:21, Tue, 20 Aug 2013 06:42:40 <-- Viewing This Message
, Fri, 19 Oct 2018 15:02:07, Tue, 20 Aug 2013 19:12:10, Tue, 20 Aug 2013 20:52:50, Thu, 22 Aug 2013 18:11:54, Wed, 21 Aug 2013 09:08:28, Wed, 21 Aug 2013 11:08:00, Wed, 21 Aug 2013 18:28:15, Tue, 20 Aug 2013 10:31:44
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