Brake pcm problem?
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Joined: Feb 2013
Posts: 226
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Car: 1991 camaro rs
Engine: 3.1 - looking to upgrade to 3400 hy
Transmission: 700r4
Axle/Gears: Stock? Lol
Brake pcm problem?
So 1991 camaro rs 3.1 today me and my teacher were checking the real times on my car with an aldl connector and computer. Something pretty odd happened when I said lets check the brake booster for vacuum leaks. (hit brake while running) the aldl cut out said no connection. We retested 5 times. I hit the brakes and my pcm (?) Cuts out. Top of that my brake lights only work when the nighttime lights are off. (head lights and such) so idk where to even start on this one ><
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Joined: Apr 2008
Posts: 10,401
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Brake pcm problem?
get under the dash and look to se if the pedals are rubbbing on any wires
second thing to do would be to disconect the brake light switch on the pedal and see if that makes a difference
second thing to do would be to disconect the brake light switch on the pedal and see if that makes a difference
Last edited by project89; May 13, 2013 at 03:20 PM.
Thread Starter
Member
Joined: Feb 2013
Posts: 226
Likes: 1
Car: 1991 camaro rs
Engine: 3.1 - looking to upgrade to 3400 hy
Transmission: 700r4
Axle/Gears: Stock? Lol
The pedals are not touching anything. Tomorrow ill try pulling it.
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Senior Member
Joined: Nov 2006
Posts: 672
Likes: 1
From: Camden, MI
Car: 1985 IROC-Z28
Engine: LB9
Transmission: 700R4
Axle/Gears: 3.73
Re: Brake pcm problem?
i've seen something odd like this before... ALDL communications would quit from shifting out of park.
take a good look at grounds.
take a good look at grounds.
Thread Starter
Member
Joined: Feb 2013
Posts: 226
Likes: 1
Car: 1991 camaro rs
Engine: 3.1 - looking to upgrade to 3400 hy
Transmission: 700r4
Axle/Gears: Stock? Lol
So I tested a little bit. Ground for the lights / brake switch are fine. Odd though I have 12.7 volts going into the switch and 11.5 coming out.
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Joined: Mar 2006
Posts: 4,367
Likes: 15
Car: 1973 Datsun 240Z/ 1985 S-15 Jimmy
Engine: Turbo LX9/To be decided
Transmission: 5-speed/T-5
Axle/Gears: R200 3.90/7.5" 3.73
Re: Brake pcm problem?
Did you test the voltage going in when you pressed the brakes? You'll likely find that it will be very near the same 11.5V. If it's not, then replace the switch.
Thread Starter
Member
Joined: Feb 2013
Posts: 226
Likes: 1
Car: 1991 camaro rs
Engine: 3.1 - looking to upgrade to 3400 hy
Transmission: 700r4
Axle/Gears: Stock? Lol
Volts stayed at 12.7 but a high resistance switch won't cause my pcm to mess up would it?
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