 
     |
| Check Engine Light when Applying the Brakes (Page 2/2) |
|
Rightasrain
|
NOV 08, 06:10 AM
|
|
Hi All,
Sorry to resurrect this but I would like to provide a summary of my pursuit of this gremlin.
The check engine light when pressing the brakes was due to the gearbox being overfilled with oil. My "genius" mechanic dumped a bucket load in there and after I've drain it to the correct level all is well.
The P0341 is most probably caused by the ICM/CPK/CPS harness, seems OK for now after replacing it, let's hope it killed it.
Cheers guys
|
|
|
Patrick
|
NOV 08, 06:35 PM
|
|
| quote | Originally posted by Rightasrain:
The check engine light when pressing the brakes was due to the gearbox being overfilled with oil. My "genius" mechanic dumped a bucket load in there and after I've drain it to the correct level all is well.
|
|
Wow, after all these years here, nothing much is "new"... but that is! Although I don't understand the connection between a CEL and too much oil in the tranny, thanks for reporting back.[This message has been edited by Patrick (edited 11-08-2024).]
|
|
|
|
cyrus88
|
NOV 09, 02:19 AM
|
|
| quote | Originally posted by Rightasrain:
. . . once the new ICM was installed the check engine light when braking went away. Really weird...
|
|
| quote | Originally posted by Rightasrain:
The check engine light when pressing the brakes was due to the gearbox being overfilled with oils . . . |
|
So, was it the ICM replacement or the gear oil? I'm confused.[This message has been edited by cyrus88 (edited 11-09-2024).]
|
|
|
|
Rightasrain
|
NOV 09, 04:22 AM
|
|
Sorry for the confusion, I got excited finally getting it solved.
I had two issues, main one, which is subject of this thread, was my "4th braking light" which triggered the CEL when pressing the brakes. This was due to too much in the gearbox which created high oil pressure.
Second issue was a P0341 which I thought was somehow connected. It wasn't. It was the ICM harness.
All is well for now, finally 
|
|
|
|
fieroguru
|
NOV 09, 09:37 AM
|
|
| quote | Originally posted by Rightasrain:
It happens in all trans gears and when the car is both on or off..
|
|
If the check engine light was coming on with the key off and brake pressed, then it is related to the brake switch wiring. The ecm can't activate a DTC and turn on the check engine light with the key off. The brake light circuit is one of the few circuits that has power while the key is off.
| quote | Originally posted by Rightasrain:
I had two issues, main one, which is subject of this thread, was my "4th braking light" which triggered the CEL when pressing the brakes. This was due to too much in the gearbox which created high oil pressure.
|
|
While overfilling an automatic transmission isn't good for it, it won't link the check engine light to the brake pedal.
I suspect you still have a wiring issue with some worn insulation between the brake wires and the check engine light wires. The issue went away because the wires are no longer touching, but the issue hasn't been "fixed".[This message has been edited by fieroguru (edited 11-09-2024).]
|
|
|
Patrick
|
NOV 09, 04:31 PM
|
|
| quote | Originally posted by fieroguru:
While overfilling an automatic transmission isn't good for it, it won't link the check engine light to the brake pedal.
|
|
The OP referred to it as a "gearbox" which leads me to believe it's a manual transmission... but nowhere in this discussion does he actually make it any more clear.  [This message has been edited by Patrick (edited 11-09-2024).]
|
|
|
|
fieroguru
|
NOV 09, 09:29 PM
|
|
| quote | Originally posted by Patrick:
The OP referred to it as a "gearbox" which leads me to believe it's a manual transmission... but nowhere in this discussion does he actually make it any more clear.
|
|
He mentioned TCC, which only exists on automatics. He also referenced pressure, and Fiero manual transmissions do not generate pressure, but automatics do as well.
|
|
|
Patrick
|
NOV 09, 09:45 PM
|
|
| quote | Originally posted by fieroguru:
He mentioned TCC, which only exists on automatics.
|
|
Ah, I missed that one reference.
| quote | Originally posted by Rightasrain Here:
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.
|
|
| quote | Originally posted by fieroguru:
He also referenced pressure, and Fiero manual transmissions do not generate pressure, but automatics do as well.
|
|
However, automatic transmissions (as well as manuals) do not generally trigger a CEL  ... so it was difficult to make total sense of this thread.
|
|
|
|
fieroguru
|
NOV 09, 10:02 PM
|
|
| quote | Originally posted by Patrick:
Ah, I missed that one reference. |
|
Its OK, you can try to do better next time!
|
|
|
|