Mazda Rotary Club

General => General Technical => Wheels & Tyres, Suspension & Brakes => Topic started by: Carrington on May 01, 2013, 11:24:05 AM

Title: ABS Problems
Post by: Carrington on May 01, 2013, 11:24:05 AM
Hi all,
After some fun antics lately I have decided to re fitted my ABS system to my 1992 FD3s and seem to have run into a problem. I have fitted the ABS pump, ABS Ecu and made up and fitted new brake lines. When I turn the ignition on the ABS light comes on and stays on and im running out of ideas.
So far I have:
Checked continuity on the Motor relay. Pass
Checked continuity on the valve relay. Pass
Checked pump is getting 12v. Pass
Checked Solenoids are getting 12v. Failed first time but found a blown 15A fuse. Replaced it then it passed.
Checked continuity of the ABS system to ground. All 3 points passed.
Checked continuity of the ABS Diode. Pass
Checked continuity of the solenoids. Pass
Checked resistance of the ABS wheel sensors. All passed.
Checked the 10A rear wiper fuses (read this could cause it). Fuse was fine.
Changed the ABS ECU.­­
So after all the above I’m stuck on what to try next. Any ideas?
Thanks
Danny
Title: ABS Problems
Post by: Carrington on May 05, 2013, 06:41:38 PM
Today I have cycle the 3 solenoids and the ABS pump to get the air moving if any in there but still the light on. Tomos going to try the same but with somebody pumping the pedal and then going to bleed all the brakes and the clutch again to see if that works.
 
Could somebody let me know if their ABS light goes out with just the ignition on but engine not started after 3 or 4 seconds?
 
Thanks
Title: ABS Problems
Post by: grinder on May 05, 2013, 06:50:14 PM
im sure on the FC you can measure resistance of the abs sensor but you have to do it with the wheel rotating .. is this how you did your ??
Title: ABS Problems
Post by: Carrington on May 06, 2013, 09:01:47 AM
For the ABS sensor resistance I disconnected the connectors (fronts are in the engine bay and rears are under the rear seats) and put my multimeter on resistance setting each measured in the 0.9 region which is acceptable to the manual. I haven\'t done the wheel rotation check yet but my current theory is as the light stays on with out the engine running or the vehicle moving then I can rule out the alternator and the millivolt\'s that the wheels would generate.
Title: ABS Problems
Post by: boosted on May 06, 2013, 09:25:57 AM
Have you actually driven the car mate....so the system can get up and running and reset itself?