[pynacl]

Hey guys so last week when I was driving I heard a pretty violent "explosion". Turned out to be my charge pipe biting the dust on my 2015 335i, as I suspected. Luckily I was already on my street so just limped it home. The blast actually blew the MAP sensor and the mount for it clean off. I found the sensor itself in the under tray when I took it off.



Now that I have re-installed a VRSF replacement charge pipe, wired everything back in and re-connected the MAP, the car is still throwing codes and stuck in limp mode.

The codes are:
120408 Charge pressure control, shutdown; pressure build-locked
121001 Boost pressure sensor, electric: Short circuit to positive
108A01 Charge air temperature sensor, electrical: Short circuit to positive

Things I've tried:
Double check all connections of the CP itself (throttle body, flex pipe, intercooler etc)
Swapped a known working MAP sensor
Unplugging battery for 30 sec and re-connecting

I tried clearing codes using BM3 after each step with no luck, codes keep coming back. I did make the rookie mistake of re-installing the MAP with the battery connected (not sure if that could cause any issues?).

I'm kind of past my comfort zone and wondering if anyone had any tips or has ran into a similar issue. My fear is that the CP blowing actually damaged something on the DME connection side. How do I go about confirming/denying that without actually accessing the DME physically?

Update:
I tried a continuity test (which I believe I'm doing correctly lol), first pic is of the car off, second is when the car is in accessory mode. Not sure if these values look correct, but I'd expect it would have roughly 12V with the car in accessory mode as well?

Car off:


Car in accessory mode:

[upsidedownfunnel]

I don't think you need to be doing a continuity test on two leads from the same harness. You would want to find the pinout of the TMAP sensor and measure the leads with everything connected up if you're trying to test the sensor itself.

Based on the error codes you're getting, and the fact that you tried a known good sensor, your wiring harness is probably jacked somehow. Maybe it's partially unplugged at the DME? Are you able to see the other end of the wiring harness?

[pynacl]

Originally Posted by upsidedownfunnel

I don't think you need to be doing a continuity test on two leads from the same harness. You would want to find the pinout of the TMAP sensor and measure the leads with everything connected up if you're trying to test the sensor itself.

Based on the error codes you're getting, and the fact that you tried a known good sensor, your wiring harness is probably jacked somehow. Maybe it's partially unplugged at the DME? Are you able to see the other end of the wiring harness?

I figured I was probably doing it incorrectly haha. I tried following the wires into the harness and quickly got overwhelmed. I wasn't able to find a great pin diagram, so I bailed. I ended up requesting an appointment with Imola Motorsports up in Minneapolis tomorrow. I'll post a quick update when things get sorted. I suspect you're correct and it actually messed up something on the DME side of things.

[Imperial328i]

I've got the Bentley manual with good diagrams. If you want I can find it and send you a pic.

[pynacl]

Originally Posted by Imperial328i

I've got the Bentley manual with good diagrams. If you want I can find it and send you a pic.

If you have it on hand and find the time that would be awesome! Best I could think of was to check RealOEM, and no luck but totally spaced a Bentley manual

[Imperial328i]

Originally Posted by pynacl

If you have it on hand and find the time that would be awesome! Best I could think of was to check RealOEM, and no luck but totally spaced a Bentley manual

When I get home later tonight I'll grab a picture of the schematic and I can help you decide what to read out. I'm an avionics technician so this is right up my alley.

[johnung]

Originally Posted by pynacl

If you have it on hand and find the time that would be awesome! Best I could think of was to check RealOEM, and no luck but totally spaced a Bentley manual

Check newtis website. May be something helpful there

[upsidedownfunnel]

If you want to avoid a trip to the mechanic, I'd highly recommend checking the other end of the wiring harness. Seeing as how that mount was ripped off, I'm going to bet the wiring is just damaged. Possibly on the side that connects to the ECU.

[pynacl]

Update: car is fixed! The damage actually was on the plug itself that plugged into the MAP. After taking the wires out of the connector, making sure all the pins were straight and reassembling, issue is gone.

[HarryTee]

Great to hear! Very happy for you.