E46Fanatics - View Single Post - Limp mode from MAF
View Single Post
Old 10-26-2012, 01:12 PM   #14
Registered User
Join Date: Dec 2011
Location: Westfield, IN
Posts: 878
My Ride: 2001 330ci
My vehicle was produced post-OBD II change, it only has the 16 pin under the dash. The codes cannot be pulled, I don't know why.. pin 16 has power but it does not connect. I've fiddled around with the key a lot to no avail. I now realize that it takes a minute to go into limp mode because the car starts on an open loop system, not utilizing most of the sensors. Once they are in spec with where they should be, the ECU turns to closed loop, and begins using these sensors. That must be where the limp mode comes from, as when the MAF is unplugged, it is in an open loop the entire time, not just partially. One of the sensors must be off, or my DME is jacked up (which would explain the OBD II mess-up). The only thing is, the ICV and MAF are new, the TP sensors would make it go into limp mode even when in open loop, as would the wheel sensors, and I don't know what other sensors are activated only in closed loop.

Does anyone have a list of closed-loop only sensors? That would be wonderful. If the CSP sensors are included, specifically the exhaust side, then I know where I'll start. That one leaks oil and the o-ring has been replaced (unless the oil is from the nearby VANOS unit, and I'm looking at it wrong).

Sent from my DROID RAZR MAXX
Corbeau FX1 Pro & CR1, Ultimo front coils, Rob43 9-click rear shocks, Swift 10k rear springs, Meyle FCA's, AKG 95a FCA, 75d rear subframe, Powerflex 95a RTA, 95a RCA, ECS 88a diff., ECS SS brake lines, LTW FW, M3 engine mounts, UUC 5sp black mounts, BMW Performance SSK, open-loop EU2 tune, CAI, headers, x-pipe, minus ~180lbs.
Weste46 is offline   Reply With Quote