360 Error code P1569 ???

Error Code P1569...

Brake Switch Information (Bank2) Malfunction(Plaus)
Check Wiring
Check ABS/ASR Error
Check Brake Switch Position

 

Dan,

I hope that helped. What OBD11 scanner are you using?

 

Dan,

Idle Speed Low is P 0506
High is P 0507

 

What did you guys do to solve your P1569 dtc was it just a brake switch?

Mine popped up yesterday with severity 2 out of 3 per the scanner. Does the brake switch fault pose a safety hazard if driving is continued? I cleared it and it came back on 30 miles later.

Thanks
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The brake pedal switch sends power to a number of components on the car, using power from fuse F48 behind the right hand seat:

Brake lights, of course
Suspension ECU (perhaps for anti-dive under braking)
F1 gearbox TCU. Is your car an F1?
ABS/ASR ECU
RH Motronic ECU.

Not sure why it sends braking data to the Motronic ECU. Perhaps "Manl Cntrl Veh. Sdp Idle Speed Control Auxiliary Inputs" is a clue? If the brake pump is using energy, it may affect engine idle speed.
I don't know what "(plaus)" means. Possible?

On some cars, the brake switch has two contacts. The other contact sends power to a second pin on the RH ECU under braking. Perhaps the two inputs are compared?

Anyway, check the basics... brake light operation, check the fuse, look for other fault lights, etc.

I have wiring diagrams should you need to check for brake power at the various components, but they are rather complicated.

 

Brakes themselves and brake lights all work.
It's a gated manual
There was another evap fault on the car later the same day. I think we got that different gremlin figured out.
I will post an update once the car is fixed, hopefully with photos. Thanks for the help

 

Thanks. F1 cars will probably give you more of an indication of intermittent problems with brake pedal switches.

There is a note in the wiring diagrams which says USA MY2002 cars have a dual input into the RH Motronics ECU from the brake pedal (I don't know if all US cars after that date had a dual input). It's possible that if you have a car with two switch contacts that one of the contacts isn't working (the one not used for brake lights). I have no idea what the second switch does. On the F430 (which has a dual contact switch) I believe the second contact acts in the opposite sense (it's normally closed, not open, until you push the pedal). The F360 could be the same. Maybe the function of the second contact is to detect an error in the primary contact?

Anyway, the wiring on the brake pedal switch should tell you what type you have.

 

Interesting stuff. I hope it's a $25 brake switch. (fingers crossed) See if I can get the part number.

 

Sorry, I meant to say the brake pedal switch wiring should tell you what type you have.

These switches can easily be checked with an ohmmeter. I would check it and clean and lubricate it before changing it.

 

The wiring diagrams don't show the internals of the switches. I drew this hypothetical diagram before I discovered that the F430 wiring diagrams showed switches that operated in the opposite sense.

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The dual contact switch connector should have 4 wires (or 3 wires with a jumper wire between two pins).

The single contact switch should only have two wires (pink and red/green).
Note that the switch spring-loaded plunger is depressed with the brake pedal not pushed. Pushing the brake pedal extends the plunger and electrically closes the switch (at least on the single contact type).

 

Correction.. a red wire and and red/green wire. I'm going colourblind

 

Often times those brake pedal switches are adjusted in and out with a plastic clip mechanism. If you let off the brakes rapidly it can shift the switch.

See if you can by hand depress the brake pedal then push the switch closer to the pedal. Then when you let off the pedal the contact is more positive

alternately-/ climb under the dash and visually see if that brake switch has moved …. Out to a position that no longer depresses the mini switch.

gl