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| Check Engine Light when Applying the Brakes (Page 1/2) |
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Rightasrain
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MAR 24, 10:15 AM
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Hi All,
I have a 3800 series II swapped 87 GT with a stange issue and any idea will be much appreciated.
As the post title suggests I get a check engine light when I apply the brakes.. The CEL is like a 4'th brake light since it goes away quickly when releasing the brakes.
Has anyone encountered this?
Thanks,
Ronen
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olejoedad
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MAR 24, 03:05 PM
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The first thing that comes to my mind is a wiring issue at C203 connector.
The CEL light and a lead from one of the brake switches both go to that connector.
The C203 is located under the center console, below where the OEM fire ECU lives.
C203-C is wired to the CEL light
C203-P is wired to the brake switch
I don't know if this is your problem, but it might be a place to start.
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Rightasrain
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MAR 25, 12:34 AM
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Thanks a bunch, super helpful!
I will check this out and update shortly.
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Rightasrain
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APR 13, 01:57 AM
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| quote | Originally posted by olejoedad:
The first thing that comes to my mind is a wiring issue at C203 connector.
The CEL light and a lead from one of the brake switches both go to that connector.
The C203 is located under the center console, below where the OEM fire ECU lives.
C203-C is wired to the CEL light
C203-P is wired to the brake switch
I don't know if this is your problem, but it might be a place to start. |
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Dug deeper and all wires/connections at C203 look solid.. I did some checking around the brake pedal switch and it is not the brake switch triggering the SES light but the TCC switch next to it.
Additionally, I'm getting a P0341 code which I thought was a different issue all together but I have no idea anymore.
Any advice would be welcomed really.
Thanks,
Ronen
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jelly2m8
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APR 13, 03:50 AM
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it's a wiring issue, follow oldjoedad's advice.
P0341 is camshaft position sensor code, irrelevant to your brake light, but possibly you have an unrelated issue.[This message has been edited by jelly2m8 (edited 04-13-2024).]
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olejoedad
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APR 13, 07:16 AM
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The TCC switch on the brake pedal should be wired to C203-P.
If its wired to C203-C that is your problem.
C203-C should be wired to PCM C2-5 (clear). It is a brown/white wire.[This message has been edited by olejoedad (edited 04-13-2024).]
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theogre
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APR 23, 10:45 AM
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Does it happen when your parked w/ transmission in neutral/park?
Or only when Driving?
If only when Driving...
Is likely Wiring problems that angry from iffy motor/trans mounts letting the engine pulling or pinching the wires.
Or bad exhaust melting the wires now then soon can cause a fire.------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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Rightasrain
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APR 23, 10:54 AM
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Thanks for responding!
It happens in all trans gears and when the car is both on or off..[This message has been edited by Rightasrain (edited 04-23-2024).]
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olejoedad
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APR 23, 03:43 PM
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| quote | Originally posted by Rightasrain:
Thanks for responding!
It happens in all trans gears and when the car is both on or off..
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Did you check the wiring at C203?
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Rightasrain
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JUN 11, 03:50 AM
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Sorry for the delay, quick update.
Checked the wiring and it all looks fine
I have replaced the ICM since I have a P0341 code and once the new ICM was installed the check engine light when braking went away. Really weird...
I still have the P0341 code after a 15 min drive which is a world of pain. New hitachi coils, New Standard ICM etc.
Still trying to sort out the electrical gremlins...
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