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ABS wheel sensor test for '96 9000 Posted by TML [Email]  (#2212)  [Profile/Gallery]
(more from TML) on Wed, 13 Jan 2010 08:22:25
In Reply to: Well done!, David Ingram, Wed, 13 Jan 2010 06:03:01 Members do not see ads below this line. - Help Keep This Site Online - Signup |
It's pretty straightforward, but I'll try to flesh it out.
Disclaimer: This procedure will only be valuable if the ABS light is on at start-up, not if it comes on only after driving.
1. With car off, disconnect the 55-pin connector to the ABS ECU, which is beside the main engine ECU under the aquarium cover on the left side.
2. Perform the resistance testing as per the OEM TCS/ABS test procededure (available from Townsend Imports website). The wheel sensors are as follows:
Pin 27 to pin 45: RR
Pin 28 to pin 46: LR
pin 29 to pin 47: RF
pin 30 to pin 48: LF
3. If all of the sensor resistances check out (0.8-1.3 kohms), then you won't learn anything more from this procedure; it's likely that your ABS problem is the ECU, or some other component besides the wheel sensors. If one or more is off, proceed to the next step.
4. Locate the 2-pin connector for the wheel sensor(s) that you identified as suspect in the previous step. The rear two are under the rear seats, beneath the floor under a foam insert. The front two are under the aquarium cover in the engine compartment. Disconnect the connector(s), and measure the resistance on the portion going to the wheel sensor (this should be the male connector). If it now reads good, then you have a continuity problem somewhere between there and the ECU. If it still reads bad, proceed to the next step.
5. Insert a resistor (0.91k, 1k, 1.1k, or 1.2 kohms) into the female end of the connector. If more than one sensor is suspect, it is critical that you do this for each one. Any one fault will trip the ABS light, so you can't test one at a time. The resistor can be a standard 1/4W 5% type, which you can get at an industrial electronics store for about $1 per 100, or a few dollars for a smaller quantity at your neighbourhood Radio Shack or The Source. Alternatively, if you have a friend who's an electronics tinkerer or works in any electronics related field, he will certainly have a couple you can borrow. Make sure the leads are positively inserted, and do not short to each other or the car chassis.
6. Start the car. If the ABS light goes out, you should be confident that replacing the wheel sensor(s) in question will fix your ABS, and that the ECU is working correctly. A further confirmation is to drive for a short period; the ABS light should come back on (how long you have to drive seems variable; the first time I did it, the light came back on within 50 metres, the second time I had to drive much further, and it didn't come on until I did a wheel-lock brake.) If you turn off the car, and restart it, the ABS light should be out again.
posted by 216.13.111...
, Mon, 11 Jan 2010 16:32:20, Thu, 14 Jan 2010 12:12:37, Tue, 12 Jan 2010 12:41:52, Wed, 13 Jan 2010 08:22:25 <-- Viewing This Message
, Wed, 13 Jan 2010 09:46:55
, Tue, 12 Jan 2010 12:18:01, Tue, 12 Jan 2010 12:39:29, Wed, 13 Jan 2010 14:16:13, Thu, 14 Jan 2010 10:36:15, Tue, 12 Jan 2010 07:26:25, Mon, 11 Jan 2010 22:27:06, Wed, 13 Jan 2010 07:39:58, Thu, 14 Jan 2010 01:21:18
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