ITT: We discuss adding ABS to a car that didn't come with it..
#62
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The other minor issue with mounting the ABS hydraulic unit in footwell would be fabricating the bracketry for it. OEM it's not hard-mounted to the chassis, rather there's a two-piece bracket with rubber isolators installed. I dunno if that's just for NVH reasons or if the ABS unit needs protection from the engine vibrations.
--Ian
--Ian
#66
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When we tried it on my car we had very mixed results. I'm about 90% sure I got it to do that two or three times, but was unable to make it consistent. It didn't make any noise while doing it -- I needed to have someone else power it on while I tried to turn the wheel with a breaker bar between the studs. It would release for half a second, then grab again. No pump noise, and my assistant didn't report any pedal pulsations. I tried using a clamp-on ammeter to look for power consumption, but by that point it had decided not to do it any more.
It cycles one channel at a time, each for half a second with a 1.5 second gap between each channel. IIRC it's front left, front right, then rears.
One thing to note is that supposedly the ABS system needs to be clear of codes in order to do it. I'm not sure exactly how you clear the codes, but bouncing power on the 10A electronics line does not seem to do it by itself (I have that line hooks to the unused cruise-control switch on my dash). I think you probably need to bounce the power on the 20A and 40A/fusible link lines as well, but I haven't confirmed whether or not this will make it reliable.
Anyhow, next time I have an available assistant I plan to try this again after clearing codes by disconnecting the battery.
--Ian
#68
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The codes mine reports are (I think) 43 and 44. It blinks "5 4 3 5 4 4" and then repeats that pattern. Given that 54 and 35 are not listed as valid codes, I'm guessing the 5 is a separator (since it flashes 5 times when the codes are cleared) and 43 and 44 are the codes. That suggests mine is unhappy with the rear wheel speed sensors for some reason.
I notice now that the 99 manual has a trouble code clearing procedure involving pressing the brake pedal 10 times in 10 seconds. I'll have to try that.
--Ian
#69
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I tried the code clearing procedure -- it turns out that 5 is not a separator, it's a code. 05 is "brake switch open or short", so I must have a loose connection in there somewhere. The code clearing procedure makes it go away, and now I can engage the diagnostic procedure. It's not subtle, it's really obvious when it engages. More details are in my build thread.
The bad news is that it didn't help the pedal feel -- it still sucks. :(
--Ian
The bad news is that it didn't help the pedal feel -- it still sucks. :(
--Ian
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