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ABS light comes on when motor warms up


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ShinyGrAm
User

Aug 31, 2013, 6:21 PM

Post #1 of 20 (8765 views)
ABS light comes on when motor warms up Sign In

1993 Grand Am 3.3L. When the motor warms up, the ABS light always comes on and stays on until the motor is allowed to fully cool down. No trouble codes. Anyone know what would cause this?


Hammer Time
Ultimate Carjunky / Moderator
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Aug 31, 2013, 6:23 PM

Post #2 of 20 (8764 views)
Re: ABS light comes on when motor warms up Sign In

It has trouble codes. You're just using the wrong equipment.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Aug 31, 2013, 9:37 PM

Post #3 of 20 (8750 views)
Re: ABS light comes on when motor warms up Sign In

Might be tough finding a code reader for that. In the meantime look and blow out and junk at wheels, 1/2 shafts and probably drum rears can pick up junk in magnetic pick ups. DON'T BREATHE THAT DIRT! No clue why engine temp would be related to that if that at all,

T



Discretesignals
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Sep 1, 2013, 7:49 AM

Post #4 of 20 (8739 views)
Re: ABS light comes on when motor warms up Sign In

Also make sure the battery tests good and the connections are clean and tight. Have the charging system checked out. That would be a good starting point before digging deeper into the ABS system.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


ShinyGrAm
User

Sep 1, 2013, 9:15 AM

Post #5 of 20 (8734 views)
Re: ABS light comes on when motor warms up Sign In

I don't believe this vehicle has ABS codes. It only has a 4-pin ALDL connector > A, B, F, M. Already cleaned out the wheels at the self-wash place. Battery and alternator are new. My theory: a sensor is going bad and the engine heat slightly effects how the wires between the sensor and module conduct which, added to the effect of a poorly working sensor, causes the ABS light to turn on when the wires near the module (over the motor) are heated up.


(This post was edited by ShinyGrAm on Sep 1, 2013, 9:17 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
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Sep 1, 2013, 9:50 AM

Post #6 of 20 (8728 views)
Re: ABS light comes on when motor warms up Sign In

1993 - codes will be marginal at best. A look/see of connections and conditions may be your friend.

Fuse to ABS should show continuity and voltage at both sides. Multi wire connections - just in case disconnect neg on battery and take a look.

Note: New parts doesn't mean they are good in fact lately they scare me!

T



Tom Greenleaf
Ultimate Carjunky / Moderator
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Sep 1, 2013, 10:03 AM

Post #7 of 20 (8720 views)
Re: ABS light comes on when motor warms up Sign In

Should have said the original white grease for connections for wiring plugs all over on a 20 year old car is junk. It can turn to a pie crust Betty Crocker would not approve of. That a joke but it happens is not!

T



Discretesignals
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Sep 1, 2013, 10:05 AM

Post #8 of 20 (8716 views)
Re: ABS light comes on when motor warms up Sign In

Believe us, it does store ABS trouble codes in the EBCM. You can only get to it with an enhanced scan tool, Tech 1, Tech 1A, or Tech 2. There are no flash code ABS diagnostics.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Tom Greenleaf
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Sep 1, 2013, 10:25 AM

Post #9 of 20 (8713 views)
Re: ABS light comes on when motor warms up Sign In

Yes it will DS, my own for the year I don't trust so much but can with paper book that tells what code means where to check.

OP - disconnecting battery will erase codes and memory - hard codes comes right back. Idle speed could be compromised for a while and stalling could happen that alone should go away in some time - arrgghh! Loved my own 63 Falcon, rolled the sucker over and sill drove it home!

T



Discretesignals
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Sep 1, 2013, 10:35 AM

Post #10 of 20 (8707 views)
Re: ABS light comes on when motor warms up Sign In

Here is the list of possible trouble codes....take your pick.

A011 ABS Indicator Lamp Circuit Open or Shorted to Ground
A013 ABS Indicator Lamp Circuit Shorted to Battery
A014 Enable Relay Contacts or Fuse Open
A015 Enable Relay Contacts Shorted to Battery
A016 Enable Relay Coil Circuit Open
A017 Enable Relay Coil Circuit Shorted to Ground
A018 Enable Relay Coil Circuit Shorted to Battery or Coil Shorted
A021 Left Front Wheel Speed = 0
A022 Right Front Wheel Speed = 0
A023 Left Rear Wheel Speed = 0
A024 Right Rear Wheel Speed = 0
A025 Left Front Excessive Wheel Speed Variation
A026 Right Front Excessive Wheel Speed Variation
A027 Left Rear Excessive Wheel Speed Variation
A028 Right Rear Excessive Wheel Speed Variation
A036 Low System Voltage
A037 High System Voltage
A038 Left Front EMB Will Not Hold Motor
A041 Right Front EMB Will Not Hold Motor
A042 Rear Axle ESB Will Not Hold Motor
A044 Left Front Channel Will Not Move
A045 Right Front Channel Will Not Move
A046 Rear Axle Channel Will Not Move
A047 Left Front Motor Free Spins
A048 Right Front Motor Free Spins
A051 Rear Axle Motor Free Spins
A052 Left Front Channel in Release Too Long
A053 Right Front Channel In Release Too Long
A054 Rear Axle Channel in Release Too Long
A055 Motor Driver Fault Detected
A056 Left Front Motor Circuit Open
A057 Left Front Motor Circuit Shorted to Ground
A058 Left Front Mot6r Circuit Shorted to Battery or Motor Shorted
A061 Right Front Motor Circuit Open
A062 Right Front Motor Circuit Shorted to Ground
A063 Right Front Motor Circuit Shorted to Battery or Motor Shorted
A064 Rear Axle Motor Circuit Open
A065 Rear Axle Motor Circuit Shorted to Ground
A066 Rear Axle Motor Circuit Shorted to Battery or Motor Shorted
A067 Left Front EMB Circuit Open or Shorted to Ground
A068 Left Front EMB Circuit Shorted to Battery or Driver Open
A071 Right Front EMB Circuit Open or Shorted to Ground
A072 Right Front EMB Circuit Shorted to Battery or Driver Open
A076 Left Front Solenoid Circuit Open or Shorted to Battery
A077 Left Front Solenoid Circuit Shorted to Ground or Driver Open
A078 Right Front Solenoid Circuit Open or Shorted to Battery
A081 Right Front Solenoid Circuit Shorted to Ground or Driver Open
A082 Calibration Memory Failure
A086 Red "BRAKE" warning Lamp Activated by ABS
A087 Red "BRAKE" warning Lamp Circuit Open
A088 Red "BRAKE" warning Lamp Circuit Shorted to Battery
A091 Open Brake Switch Contacts During Deceleration
A092 Open Brake Switch Contacts When ABS Was Required
A093 DTC A091 or A092 Set in Current or Previous Ignition Cycle
A094 Brake Switch Contacts Always Closed
A095 Brake Switch Circuit Open
A096 Brake Lamps Circuit Open





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


ShinyGrAm
User

Sep 1, 2013, 1:18 PM

Post #11 of 20 (8697 views)
Re: ABS light comes on when motor warms up Sign In

I appreciate the info and the code list. So where can I rent or otherwise access an enhanced scan tool, Tech 1, Tech 1A, or Tech 2? I live in SE Michigan.


(This post was edited by ShinyGrAm on Sep 1, 2013, 1:54 PM)


Discretesignals
Ultimate Carjunky / Moderator
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Sep 1, 2013, 3:11 PM

Post #12 of 20 (8690 views)
Re: ABS light comes on when motor warms up Sign In

Not sure about who rents out scan tools like those where you live, but you could call around some repair shops in your area to see if they have the tool that can scan the EBCM for you.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Tom Greenleaf
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Sep 2, 2013, 1:12 PM

Post #13 of 20 (8674 views)
Re: ABS light comes on when motor warms up Sign In

No regulars known close to SE MI.

Just look for visual problems for now. If you get down to needing code(s) ask around by phone in person or whatever,

T



ShinyGrAm
User

Sep 2, 2013, 3:00 PM

Post #14 of 20 (8668 views)
Re: ABS light comes on when motor warms up Sign In

OK, check this out. While the motor was cold (and the ABS light not staying on) I disconnected 1 then both of the front ABS sensors expecting the ABS lamp to light. I started the motor, put it in drive, let the wheels turn, hit the brake. Nothing. Why wouldn't this condition send an ABS warning??


Tom Greenleaf
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Sep 2, 2013, 3:33 PM

Post #15 of 20 (8664 views)
Re: ABS light comes on when motor warms up Sign In

The ABS warning might take starting the car and running like other lights can and are just bulb check mode and I can't speak for every make and model of everything but that would be common to GM anything I ever knew of.

Hey - anything brakes needs your attention. The default mode is regular braking. If you rely on this thing thinking how to stop by itself you could be surprised. Light on means ABS should be OFF. It's up to you to be safe not this or any web site,

T



ShinyGrAm
User

Sep 2, 2013, 4:05 PM

Post #16 of 20 (8657 views)
Re: ABS light comes on when motor warms up Sign In

My bad. Apparently the car is smarter than I thought it was. When I tried it before with a disconnected sensor it was on the jack. When I actually drove it with the front left sensor disconnected, the light popped on within 100 feet. Ok, so the ABS warning system works. The original problem still remains, however, where the ABS light comes on and stays on after the motor warms up.


(This post was edited by ShinyGrAm on Sep 2, 2013, 4:07 PM)


Tom Greenleaf
Ultimate Carjunky / Moderator
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Sep 2, 2013, 4:47 PM

Post #17 of 20 (8651 views)
Re: ABS light comes on when motor warms up Sign In

Again! This is a brake issue and suggestions from me or anyone should be. Get the help,

T



Discretesignals
Ultimate Carjunky / Moderator
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Sep 2, 2013, 4:50 PM

Post #18 of 20 (8647 views)
Re: ABS light comes on when motor warms up Sign In

I don't understand why your making it difficult. If you get it scanned, you'll know why the ABS computer is turning the light on. Then you'll know where to look for the problem.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


ShinyGrAm
User

Sep 2, 2013, 5:03 PM

Post #19 of 20 (8645 views)
Re: ABS light comes on when motor warms up Sign In

Old car. I'd rather fix it myself if at all possible.


(This post was edited by ShinyGrAm on Sep 2, 2013, 7:48 PM)


Tom Greenleaf
Ultimate Carjunky / Moderator
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Sep 3, 2013, 2:42 AM

Post #20 of 20 (8626 views)
Re: ABS light comes on when motor warms up Sign In

Fine - you can fix it yourself but don't have a clue yet where to start.

Park that sucker now..........

T







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