DTC ECM-640F

Condition
If the engine is hot when the ignition is switched on, an adaptation of the reset valve (Continuous variable valve timing) takes place. The control engine control module (ECM) then checks that the continuous variable valve timing (CVVT) limit position is reached. If this limit position is not reached, the engine control module (ECM) registers this as a fault and stores diagnostic trouble code (DTC) ECM-640F.

Substitute value
- none.

Possible source

Incorrect signal:
- incorrect base setting of the timing belt.

Fault symptom[s]
- uneven idle
- poor performance.