ALDL connector
Thread Starter
Race Director
Joined: Jul 1999
Posts: 16,283
Likes: 104
From: Sun city CA
ALDL connector
I have no H pin in my ALDL connector !
This is on a 1989 model... the book says to use the A and H pins to pull and clear codes... is this wrong ?
I found a broken wire at the relay and fixed that, but now I can't clear the codes... this really sucks !
This is on a 1989 model... the book says to use the A and H pins to pull and clear codes... is this wrong ?
I found a broken wire at the relay and fixed that, but now I can't clear the codes... this really sucks !
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
For your ALDL simply jumper A&B (upper right) and turn on the ignition key; then count the SES flashes to get the codes.
To clear the codes, simply open the connection in the large Orn wire comming off the battery for a minute. This is the power connection to the ECM only and opening it will NOT effect your clock or radio presets.
To clear the codes, simply open the connection in the large Orn wire comming off the battery for a minute. This is the power connection to the ECM only and opening it will NOT effect your clock or radio presets.
Thread Starter
Race Director
Joined: Jul 1999
Posts: 16,283
Likes: 104
From: Sun city CA
For your ALDL simply jumper A&B (upper right) and turn on the ignition key; then count the SES flashes to get the codes.
To clear the codes, simply open the connection in the large Orn wire comming off the battery for a minute. This is the power connection to the ECM only and opening it will NOT effect your clock or radio presets.
To clear the codes, simply open the connection in the large Orn wire comming off the battery for a minute. This is the power connection to the ECM only and opening it will NOT effect your clock or radio presets.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
The H pin is empty on my '88 too and the FSM shown no connection there.
You have a response to your message too.
From a brief read on ABS in my '88 FSM it looks like any ABS diagnostics require connection of a specialized ABS testor.
If you like I can take pics of the ABS diagnostic pages of my FSM and email to you. Shoot me an email to jgkov@msn.com and I'll snap off the pics and respond with them to you.
BTW, what color wire did you solder to, I assume, the Module Relay?
You have a response to your message too.
From a brief read on ABS in my '88 FSM it looks like any ABS diagnostics require connection of a specialized ABS testor.
If you like I can take pics of the ABS diagnostic pages of my FSM and email to you. Shoot me an email to jgkov@msn.com and I'll snap off the pics and respond with them to you.
BTW, what color wire did you solder to, I assume, the Module Relay?
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
For 86-89 Corvettes, GM used the J35890 ABS Tester to diagnose problems. You unplug the connector going to the ABS Module, plug in the tester. It tests the module, can activate the pump and relays and also monitor the ABS wheel sensors as you spin a wheel.
