When the P0340 code is set, it means that the ECU has detected a problem with the CMP sensor circuit. This could be due to a faulty CMP sensor, a damaged wiring harness, or a problem with the ECU itself.
Symptoms of a faulty CMP sensor can include:
* Engine misfires
* Rough idling
* Stalling
* Reduced power
* Check engine light illuminated
If you are experiencing any of these symptoms, it is important to have your vehicle diagnosed by a qualified technician to determine the cause of the problem and have it repaired.