ECU Fault codes, throttle sticking,

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  • dice2012
    Member
    • Mar 2021
    • 74

    #1

    ECU Fault codes, throttle sticking,

    Hey all, trying to troubleshoot some issues on my car. Wanted to see if anyone had any ideas.

    1. P0340 Code (cam position sensor)
    They are NLA from BMW, so I wanted to check if there was any chance this could be a wiring problem rather than an issue with the sensor internals? Wiring looked fine as far as I could tell. Also, are VDO sensors any good? Couldn't find any writeups to test the plug or sensor.

    2. P0111 Code (intake air sensor range/performance problem)
    Checked resistance at the sensor, 5k ohm in air, 3.8k ohm in my hand. Checked voltage at the plug, 5.2V. OBD scanner always reads -40C regardless of ignition on/engine on, plugged in/not, whatever. Figure it's a cheap enough sensor to replace as is, but could this possibly be a DME issue? Or maybe I plugged it into the wrong plug? (Although the plug was zip tied to the throttle position sensor plug, so I'm not sure about that)

    3. Throttle is super sticky only when engine is on
    It feels like there is some resistance in the pedal when the engine is on. Makes it really hard to lightly tap the gas to do light acceleration from a stop. I made it somewhat better by letting out all the slack in the adjustment screw, but it is still hard to drive. Throttle actuates fine by hand when it is on, and I've tried scrubbing the bore with some throttle body cleaner with no luck.
    I'm using an E34 cable (35411160609) with the OBD2 S52 throttle body (on the throttle body's lower cable mounting hole, used for cruise control usualls, as the bracket that holds the throttle cable stop was snapped off when I got it). Tried moving the cable around, but I can't find much better routing. Currently going under the master cylinder and up into the throttle body bracket, making a big U. Should I try a different cable, or is there a different routing or adjustment I haven't tried yet?

    Thanks in advance.
    the big D
  • Panici
    Moderator
    • Dec 2009
    • 2550

    #2
    Originally posted by dice2012
    Hey all, trying to troubleshoot some issues on my car. Wanted to see if anyone had any ideas.

    1. P0340 Code (cam position sensor)


    2. P0111 Code (intake air sensor range/performance problem)


    3. Throttle is super sticky only when engine is on


    Thanks in advance.
    1. Yes VDO is typically good.

    2. Get the wiring diagram / electrical manual for your E30. They're available online. Match the wire colours to verify you have the right connectors.

    3. I ended up using the E36 cable (35411163228) with the M52B28 OBD2 throttle body. I had to take up some slack with an aftermarket cable end, but otherwise it was a good fit.

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