2002 E46 325ti - Codes read... What do they mean???

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  1. 2002 E46 325ti - Codes read... What do they mean??? 
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    With the help of Ian S we read the codes the other day on my 2002 325ti compact as both traction control lights (triangle one in middle and the handbrake sign in yellow) came on and beeped at me as i was driving along.. meaning it had picked up a fault

    Now when scanning the ABS and Traction Control system the software came back saying '5E20 Pressure Sensor 1 Accident Recognition'

    Myself and Ian looked at eachother clueless as to what it could be

    Any body have an idea?

    the lights are not coming on at all now and in total have only come on twice

    Cheers
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    Quote Originally Posted by LiLoCollinsy View Post
    With the help of Ian S we read the codes the other day on my 2002 325ti compact as both traction control lights (triangle one in middle and the handbrake sign in yellow) came on and beeped at me as i was driving along.. meaning it had picked up a fault

    Now when scanning the ABS and Traction Control system the software came back saying '5E20 Pressure Sensor 1 Accident Recognition'

    Myself and Ian looked at eachother clueless as to what it could be

    Any body have an idea?

    the lights are not coming on at all now and in total have only come on twice

    Cheers
    Ill have a look for you tomorrow Lilo and see what info i can find
    Im convinced it will be connected to your sticking brake
    Ill look it up in my lunch break ASAP
     
     

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    Comes up as MAP sensor?

    What symptoms if any have you had?

    has the car been stalling or hesitating?
     
     

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    Quote Originally Posted by Ronnie View Post
    Comes up as MAP sensor?

    What symptoms if any have you had?

    has the car been stalling or hesitating?
    Not at all

    not stalled since ive had it (dec 08)

    and pulls fine as soon as i put my foot down

    whats the MAP sensor anyway?
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    MAP sensor stands for Manifold Absolute Pressure sensor, that is what the code relates to, thing is your car doesn't have a MAP sensor, let me look further into it for you , will post back
     
     

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    Quote Originally Posted by Ronnie View Post
    MAP sensor stands for Manifold Absolute Pressure sensor, that is what the code relates to, thing is your car doesn't have a MAP sensor, let me look further into it for you , will post back
    Thought MAP sensors were more for Turbo cars?

    Cheers mate

    appreciate it
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    Quote Originally Posted by Ronnie View Post
    Comes up as MAP sensor?

    What symptoms if any have you had?

    has the car been stalling or hesitating?
    The dme was clear, this code was from the asc/abs module. I was going to look it up but as we were outside talking for so long the battery went on the laptop before I could save the codes! We cleared the codes and tried turning the ignition on and off to get the fault to reoccur but it didn't.
     
     

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    Got some good info here Lilo.
    Ill post it up later when i get 5 mins as there is a lo of writing
     
     

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    Right here goes
    Ive done some homework on this for you guys and ill try to explain it the best i can, so ill apologise now if some doesnt make sense. Please ask questions if you are unsure

    The ABS and stability control use the brakes to get you out of trouble
    They have two pressure sensors in the brake line hydraulic circuits. You have dual circuit brakes so if one wheel loses all the fluid you will never lose the brakes completley.
    One of the sensors measures the pressure in one of the circuits and vice versa.
    The sensors are bolted into the circuit at the master cylinder. They contain a capacitor with variable capacitance. The Control unit supplies them with a 5v supply and an earth. A change in pressure in the hydraulic circuit changes the capacitance of these capacitors. The change is converted by the Control units into an electrical signal. A voltage of 0.5v is equal to zero pressure in the brake system (when your foot is off the brake pedal)

    Both of these two sensors work together and because your N/S/F brake is binding and there is a slight pressure difference. The 2 sensors are sending different signals to the control unit. This is creating a fault because there is no signal from the brake pedal switch. The Control unit is assuming its the sensor at fault and not the brake system itself

    In other words, when you sort the brake binding the fault should not return.
    I do have the voltages and test procedures for these sensors but they have to be tested from the control unit plug to ground.
    IMO you have nothing to worry too much about.

    Please ask if anyone is confused coz my brain hurts from writing this.
     
     

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    Excellent work Steve, I knew there wasn't a MAP sensor so my code program has some wrong info posted up on what sensor to check.

    At least the code breakdown was correct

    What did you use to find the info? was it the KTS?
     
     

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