Any thoughts on this?
Code popped up even after PCM reset
[Brake] C1275 - (History) (Current)
Looked this up...
C1275 PCM requested ETS/TCS to be disabled (engine problem)
Not an actual SES light but HPtuners scan is picking it up. Car has ALWAYS had brake issues. I found this site, really gives a good explanation of the ABS system.
Thats where I found the better description of the trouble code. What does it mean by "engine problem" that the PCM would send a signal to turn off ETS/TCS?
Also with brakes sucking, I have suspected at times(I could be 100% wrong) that the brake proportioning was off.
Could this be related?
DBC-7 BRAKE PROPORTIONING
Something you won't find on a DBC-7 equipped vehicle is a brake proportioning valve. DBC-7 uses the ABS solenoids to reduce pressure to the rear brakes during normal [COLOR=blue ! important][COLOR=blue ! important]braking[/COLOR][/COLOR] to maintain proper brake balance. This is done by monitoring front and rear wheel speeds, and reducing pressure to the rear brakes as needed when there's a difference in wheel deceleration rates.
The controller energizes the inlet valve solenoids for both rear brakes to hold pressure in the lines, and then energizes both rear outlet valve solenoids to release pressure as needed. The pump may also run to clear the accumulators if a sufficient number of release cycles are required.
The "dynamic" rear proportioning function is enabled at all times unless there is a failure of the EBCM or two wheel speed sensors on the same axle both fail simultaneously (a code C1248 will be set if the system is disabled). But as long as there is at least one functional speed sensor on the front and rear axles, the EBCM can compare the relative speeds of the front and rear wheels.
Another new feature of the DBC-7 is the ability to detect low [COLOR=blue ! important][COLOR=blue ! important]tire [COLOR=blue ! important]pressure[/COLOR][/COLOR][/COLOR]
. A tire that is underinflated will have a slightly smaller rolling radius than one that is properly inflated. This will create a difference in the wheel speed sensor reading if the difference in inflation pressure is 12 or more pounds. The EBCM will then turn on the "Low Tire Pressure" warning lamp to warn the [COLOR=blue ! important][COLOR=blue ! important]driver[/COLOR][/COLOR] his tires need attention.