C1668 Mercury Comet OBD Code

OBD/2 C1668 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) C1668 DTC is a check of the VCT unit.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

C1668 Mercury Comet Error Code Repair Process :

If your insufficient coolant temperature for closed loop fuel control; 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 C1668 and engine control unit are in charge of monitoring a bunch of different insufficient coolant temperature for closed loop fuel control;, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Mercury Comet C1668 OBD2 Code

A common cause of code C1668 is the failure of Insufficient Coolant Temperature for Closed Loop Fuel Control;, but there are several other possible causes as well, such as ;

Camshaft advance mechanism binding (VCT unit)
Faulty Variable Camshaft Timing (VCT) position solenoid
Faulty Air fuel ratio (A/F) Sensor 1 Bank 1
Variable Camshaft Timing (VCT) position circuit is open or shorted

C1668 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

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

About Us | Contact | Privacy

C1668 Mercury Comet OBD Code

C1668 Mercury Comet Error Code Repair Process :

Common Causes of Mercury Comet C1668 OBD2 Code

C1668 code for other Mercury cars