P3686 Volkswagen W12 OBD Code

OBD/2 P3686 error code description and symptoms.

Variable Cam Timing Over-advanced (Bank 1) The comprehensive component monitor (CCM) monitors the VCT position for an over-advanced camshaft timing.
The test fails when the camshaft timing exceeds a maximum calibrated value or remains in an advanced position. Cam timing improperly set No oil flow to the VCT piston chamber Low oil pressure VCT solenoid valve stuck closed Camshaft advance mechanism binding (VCT unit) P3686 DTC is a check of the VCT unit.

As long as the throttle plate remains closed, the idling speed and quality is controlled by the PCM via the idle control valve, and as can be seen from the above it should be clear that idle control on a gasoline engine is a complex affair. For instance, if the engine is started in sub-zero temperatures, the PCM will command the idling control valve to allow less air to enter the engine to enrich the air/fuel mixture to create a condition which is roughly analogous to how chokes worked on carburetted engines to control idling in cold weather.

P3686 Volkswagen W12 Error Code Repair Process :

If your accelerometer front circuit short to ground check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system P3686 and engine control unit are in charge of monitoring a bunch of different accelerometer front circuit short to ground, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Volkswagen W12 P3686 OBD2 Code

A common cause of code P3686 is the failure of Accelerometer Front Circuit Short To Ground, but there are several other possible causes as well, such as ;

Camshaft advance mechanism binding (VCT unit)
Faulty Air Flow Meter
Camshaft advance mechanism binding (VCT unit)
Oil flow restriction in the oil passages or the variable camshaft timing (VCT) valve body

P3686 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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P3686 Volkswagen W12 OBD Code

P3686 Volkswagen W12 Error Code Repair Process :

Common Causes of Volkswagen W12 P3686 OBD2 Code

P3686 code for other Volkswagen cars