Don't buy cheap CMP sensors...
Fault description:
During engine warm up, when reaching close to operating temperatures the engine hesitated and simply shut down. Could be restarteded without a problem.
jeep Diag diagnostics: P0340 CMP circuit fault
Turned out not being a wiring problem as assumed. It was a faulty sensor. Again!
Brand: VEMO - 8€
Exchanged against a Magneti Marelli, 28€, thats works perfectly.
So the differences in fault apperances and symptoms are very minor. After warm up and low load situation (IAT), and now it was during warm-up (CMP).
Since it is so important I ordered a second one along with a crank position sensor, an Air intake sensor and boost pressure sensor.
I do have a little peli case to carry them as spares since you probably can't get those while on the move.
If you have a wiring problem with the CMP- the engine will simply not start. Once it's running you only get an Out-of-sync message.
Remember- if you want to test the wiring test the 5V power supply at the sensor, test the return line against battery minus. The sensor wiring must be measured at the ECM - you need to read between 0.2V and 4,5V if it's higher or lower then the sensor is fried.
Picture shows Sensor connector view, not wiring.
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C30 AMG 3.0L engine doing donuts
Last edited by Deezelweazel; 02-11-2023 at 06:27 PM.
Reason: adding info to prevent damage to ECM
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