Anti-Lock module or pump
Racer
Joined: Oct 2012
Posts: 350
Likes: 2
From: Huntsville AL
Thread Starter
Intermediate
Joined: Jul 2011
Posts: 42
Likes: 2
Anti-lock,'87
Let me qualify that post; the ABS is inoperable and I have the dash light
signaling anti-lock trouble. My scanner is too new to give an exact code
but my mechanic checked the wheel sensors, reluctor rings but stopped
at the control module (not having any special tools). I understand Bosch
made the module and the trail ends there. I would like to find the actual
cause before replacing parts; used module is about $250 +-.
Bon Air
signaling anti-lock trouble. My scanner is too new to give an exact code
but my mechanic checked the wheel sensors, reluctor rings but stopped
at the control module (not having any special tools). I understand Bosch
made the module and the trail ends there. I would like to find the actual
cause before replacing parts; used module is about $250 +-.
Bon Air
Racer
Joined: Oct 2012
Posts: 350
Likes: 2
From: Huntsville AL
I guess it is safe to assume you don't have a Factory Service Manual. It is hard to do much troubleshooting without one. Even without a scan tool, you can troubleshoot quite a bit with a multimeter *IF* you have a schematic.
Without an FSM, a good place to start is to check all fuses.
Without an FSM, a good place to start is to check all fuses.
Instructor
Joined: Apr 2007
Posts: 225
Likes: 1
From: Highland Village texas
Bon air read this article it will get you going on trouble shooting your system. http://www.corvettefever.com/howto/19239/ This article will help you TS the module relays which are normally at fault.
Racer
Joined: Oct 2012
Posts: 350
Likes: 2
From: Huntsville AL
Are you asking where on the car the relays are located, or where can you obtain a replacement? If you Google "87 Corvette ABS relay" you will find answers to both questions.
Did you check all fuses as previously suggested? I read the article too, and the troubleshooting sequence seemed a bit bass ackwards to me. They run you through troubleshooting the relays and THEN have you check for power. First things first. Check your fuses. A blown pump motor fuse means no pump motor, which causes a failed power on self test, which triggers the ABS IDIOT light.
Did you check all fuses as previously suggested? I read the article too, and the troubleshooting sequence seemed a bit bass ackwards to me. They run you through troubleshooting the relays and THEN have you check for power. First things first. Check your fuses. A blown pump motor fuse means no pump motor, which causes a failed power on self test, which triggers the ABS IDIOT light.
Last edited by Just BOB; Jun 26, 2013 at 10:12 AM.
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Instructor
Joined: Dec 2004
Posts: 217
Likes: 1
From: Drums PA
Regards, Chris
Thread Starter
Intermediate
Joined: Jul 2011
Posts: 42
Likes: 2
Hey Chris/BOB:
Thanks again for the help, I just checked all fuses, and with limited knowledge, tested the voltage to all the relays, removed them and listened for any loose rattle and re-checked
all the ground connections. Sometime you just live right; when I started it for a test the
trouble light was OUT. Amen
Bon Air
Thanks again for the help, I just checked all fuses, and with limited knowledge, tested the voltage to all the relays, removed them and listened for any loose rattle and re-checked
all the ground connections. Sometime you just live right; when I started it for a test the
trouble light was OUT. Amen
Bon Air
Instructor
Joined: Dec 2004
Posts: 217
Likes: 1
From: Drums PA
Hey Chris/BOB:
Thanks again for the help, I just checked all fuses, and with limited knowledge, tested the voltage to all the relays, removed them and listened for any loose rattle and re-checked
all the ground connections. Sometime you just live right; when I started it for a test the
trouble light was OUT. Amen
Bon Air
Thanks again for the help, I just checked all fuses, and with limited knowledge, tested the voltage to all the relays, removed them and listened for any loose rattle and re-checked
all the ground connections. Sometime you just live right; when I started it for a test the
trouble light was OUT. Amen
Bon Air
Instructor
Joined: Dec 2004
Posts: 217
Likes: 1
From: Drums PA
Regards, Chris
Thread Starter
Intermediate
Joined: Jul 2011
Posts: 42
Likes: 2
Chris:
I sent something earlier but it was through my phone (I don't trust the connection).
I tested the relay #1636973, the larger one with the connector, each wire reads 11volts
+- and the ground reads zero. There two smaller relays on top of the pump but they simply
plug in, one is a RY-304, the other is silver colored..I assume you just swap in a good one
just to check. Do you also have these smaller plug-ins?
Bon Air (by the way BonAir is the golf club where I belong..easy to remember)
I sent something earlier but it was through my phone (I don't trust the connection).
I tested the relay #1636973, the larger one with the connector, each wire reads 11volts
+- and the ground reads zero. There two smaller relays on top of the pump but they simply
plug in, one is a RY-304, the other is silver colored..I assume you just swap in a good one
just to check. Do you also have these smaller plug-ins?
Bon Air (by the way BonAir is the golf club where I belong..easy to remember)
Instructor
Joined: Dec 2004
Posts: 217
Likes: 1
From: Drums PA
Chris:
I sent something earlier but it was through my phone (I don't trust the connection).
I tested the relay #1636973, the larger one with the connector, each wire reads 11volts
+- and the ground reads zero. There two smaller relays on top of the pump but they simply
plug in, one is a RY-304, the other is silver colored..I assume you just swap in a good one
just to check. Do you also have these smaller plug-ins?
Bon Air (by the way BonAir is the golf club where I belong..easy to remember)
I sent something earlier but it was through my phone (I don't trust the connection).
I tested the relay #1636973, the larger one with the connector, each wire reads 11volts
+- and the ground reads zero. There two smaller relays on top of the pump but they simply
plug in, one is a RY-304, the other is silver colored..I assume you just swap in a good one
just to check. Do you also have these smaller plug-ins?
Bon Air (by the way BonAir is the golf club where I belong..easy to remember)