P1646 Audi EVAP Vent Solenoid Output Circuit
Possible causes
– Faulty EVAP Vent Solenoid
– EVAP Vent Solenoid harness is open or shorted
– EVAP Vent Solenoid circuit poor electrical connection
– EVAP Vent Solenoid harness is open or shorted
– EVAP Vent Solenoid circuit poor electrical connection
What about the obd code?
The Powertrain Control Module (PCM) has detected the EVAP Vent Solenoid circuit was low
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1646 Audi Description
The Powertrain Control Module (PCM) contains chips called Output Driver Modules that provide 7 switchable ground outputs for operating solenoids, relays, telltales, and other devices. Each of these ground outputs has an internal fault line that feeds back to the PCMs microprocessor. When the output is OFF, the output driver should receive the 12 volts fed to the solenoid, relay, etc. When the output is ON, it should receive 0 volt since it is grounding the output. If it receives 0 volt when the output is OFF or 12 volts when the output is ON, it sets the fault line low.
Audi Vehicle:Audi A1,Audi A3,Audi A1,Audi A3,Audi A1,Audi A3,Audi A4,Audi A5,Audi Q3,Audi A5,Audi Q5,Audi A3,Audi A4,Audi A5,Audi TT,Audi Q3,Audi Q5,Audi S3,Audi TTS,Audi RS 3,Audi TT RS,Audi A7,Audi Q7,Audi A8,Audi A6,Audi S4,Audi S5,Audi Q5,Audi S6,Audi S8,Audi S5,Audi A8,Audi R8 V8,Audi RS 5,Audi S6,Audi R8 V10,Audi R8 GT,Audi A8L