Join Date: Jul 2018
Drives: 2009 Cee'd SW 1.6 CRDI (115 ps)
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2009 1.6 CRDI stuck in limp mode - MAP dead?
First post here, so I'll try to be a Good Member and be detailed. I've done plenty of Googling before joining and kept seeing the site in the results, so...
I've had my 115bhp CRDI for just over a year. Since I bought it, there has always been a bit of a flat spot under acceleration when cold at around 1800 rpm. However, in the last month it has gotten progressively worse. At first the single flat spot became several, and when I drove with the window down I could hear the turbo spinning up and then being cut off. I assumed it was bad diesel as it started after filling up from almost empty. I put some STP cleaner in it and things were ok for a few days.
The flat spots have gotten bigger (after several full tanks from different garages), until finally I realized it must be in limp mode despite having no check engine light. There is no turbo at all, and it won't rev past 2800 rpm. After some more Googling I cleaned out the MAF sensor and replaced the air filter, but it made no difference.
Yesterday I took delivery of an OBD2 module, and it told me that the following errors were logged:
P0098 (IAT Sensor 2 Circuit High)
P0238 (Turbo Boost Sensor 'A' Circuit High)
P0069 (Manifold Absolute Pressure - Barometric Pressure Correlation)
When driving, the intake temp is stuck at -40°C and the intake pressure is fixed at 37.0 PSI. Having found the thread "KIA Cee'd CRDI intake air temperature sensor" on here, it looks like the IAT sensor might be the problem.
I took this off today and cleaned it, as it was quite dirty. I also cleaned the connectors with contact cleaner. After putting it back together, the code which I thought was unrelated - P0069 - has cleared! However, everything else is the same.
One thing I have noticed is that this thing, located up the hose from the intercooler, has a broken collar. I'm not sure what it is, but I think it's a butterfly of some description as the engine seems to choke if I close it:
As you might have guessed, I'm no mechanic! I'm leaning towards diagnosing the MAP sensor as dead, but am very grateful for any advice!