Al Cayenne S

Hello,

Before I start, I like to claim that I have done my research and I couldn't find anything related to my problem.

I have 2012 Cayenne S and I have an engine light on with P0688 code.

My first step was going to clean up MAF sensors but I had been informed that my model does NOT have MAF sensors.
In that case, I thought it was a no brainer to replace MAP sensor which is located on the top of the engine just right behind the firewall (it was like 5 min job as well).
I resetted the code and it appeared that the problem is solved.

The same code came back up after a few trips and I really don't know what else I can do at this point?

I would appreciate any inputs from fellow Cayenne owners!

snappy

according to my check..

17072/P0688/001672 - ECM Power Relay Load Circuit: (J271): Open Circuit

Possible Symptoms
Engine Coolant Fan running at full Speed while Ignition is OFF and Engine is COLD (could lead to discharged Battery)
Possible Causes
Fuse(s) faulty
Power Supply Relay for Engine Control Module (J271) faulty
Terminal 87 faulty/hanging
Wiring between Engine Control Module (J220) and Power Supply Relay for Engine Control Module (J271) faulty
Possible Solutions
Check/Replace Power Supply Relay for Engine Control Module (J271)
Check Wiring between Engine Control Module (J220) and Power Supply Relay for Engine Control Module (J271)
Check/Replace Engine Control Module (J220)