EML and Engine Warning light on

[Hazzer2k]

Morning Everyone...

I have a 2008 BMW Z4 2.0I

I have an EML light on my dash constantly, and engine warning light on intermittently. Had the codes read:

2CF8 - Throttle-Valve Potentiometer
2D07 - Throttle-Valve Potentiometer

The car runs perfectly, and drives very well. No loss of power.

I have checked all the sensors on the intake, they are all working. I have also changed the Throttle Body, still not fixed.

The only thing left on the intake, is the Intake Manifold Actuator, behind the oil filter.

Has anyone else had this issue? Any advice appreciated.

 

[Smartbear]

Are you sure the pedal end of the system is working ok?
Rob

 

[enuff_zed]

Well firstly, welcome to the forum.

A bit of googling (which I guess you already did?) suggests either dodgy connections in the harness or on the connectors to the potentiometer?
Have you looked into this at all? Cleaned the contacts etc.
The fact that the engine warning light is intermittent could point to a connection that is sometimes working and sometimes not?

 

[Hazzer2k]

Yeah, the pedal has been tested and is working fine.

 

[Hazzer2k]

Thanks, yes I have checked all the connections and all great. The only thing that isn’t showing power is the connector to the Intake Manifold Actuator...

 

[enuff_zed]

Thanks, yes I have checked all the connections and all great. The only thing that isn’t showing power is the connector to the Intake Manifold Actuator...

I'm no electrical expert (there are several on here that I'm sure will chip in before too long though), but if you are not getting power TO the actuator, does that not point to a loom issue? Can't imagine it having it's own fuse, but have you checked them all?

 

[Hazzer2k]

I would say that depends on how the electrical system works. Being an (electrical design engineer). The actuator could only require power at certain times. Not a constant power supply.

All the fuses are good.

I have had a few issues electrical wise, due to the car being sat for around 3 years.

Just wondering if anyone has any knowledge on the Actuator itself?

 

[enuff_zed]

I would say that depends on how the electrical system works. Being an (electrical design engineer). The actuator could only require power at certain times. Not a constant power supply.

All the fuses are good.

I have had a few issues electrical wise, due to the car being sat for around 3 years.

Just wondering if anyone has any knowledge on the Actuator itself?

Ah well, you're vastly more qualified than me then.
Hope you get it sorted

 

[Jfgoldfish]

The crimped connections on the throttle body are known, on many BMW models including our Zeds, to intermittently fail with high resistance.
How did you test the actual connections?
Removing each terminal from the housing and giving the crimped tabs a squeeze is usually sufficient to sort them. If you are confident with a soldering iron you can flux the connection and flow a little solder onto the crimped tabs for a more permanent fix.
Depending on which connections fail, you can end up with communication errors on the data bus between the DME and throttle body; this situation can throw the 5E19 code and put the car into limp home mode as well as throwing numerous unrelated codes due to corrupt data on the Kbus.

I recommend very careful inspection of these connectors. After all these years the looms in these older vehicles are becoming common failure points.

 

[Trav]

Had the same warning lights come up the other week. I pulled over and got the RAC to drop it at the local indy. The throttle valve actuator was goosed. Not a cheap part. All good now though.

 

[ph001]

Good info but the throttle valve is radically different on the M cars to the 2.0l 4-pot of course.

OP - have you tried clearing the codes an see how quickly and under what circumstances they come back?