Too high or low a value indicates a faulty coil inside the valve, thusly meaning replacement is necessary. Using a DVOM, check the resistance of the vent, in most cases the resistance reading should be low, refer to the manufacturer’s specification or compare it to a new one. If you have access to an advanced level scan tool, actuate the valve while reading power and ground at the connector or by simply using a bulb wired to both terminals, it will light up if power and ground are OK. Trace the wires to and from the PCM/EMC/ECM and check for continuity continuity using a digital volt ohm meter (DVOM). Visually inspect the vent valve for cracks or damage. Check both wires to see if they are shorted to each other, to ground or power. Some steps to take to diagnose and repair this trouble code include the following:Ĭheck your fuses, there may be a fuse that powers the vent solenoid.Ĭheck for a rubbed-through or chafed wiring harness. Symptoms of a P0499 DTC will include Malfunction Indicator Lamp (MIL) illumination, you will likely not notice any other symptoms. This vent valve is apart of the simple, yet complicated evaporative emissions system. The Powertrain Control Module (PCM) / Engine Management Computer (EMC) / Engine Control Module (ECM) has detected a fault with the circuit that controls the vent for evaporative emission systems vapor.Īs fuel sits in the tank it lets out fuel vapor, while driving this vent opens and allows the vapors to be circulated into the engine intake manifold, a charcoal canister or into the atmosphere, depending on the vehicle. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may vary depending on the model. Idle for 5 minutes, then shut the engine and leave the vehicle off for 10 minutes.Evaporative Emission System Vent Valve Control Circuit High What does that mean? Repeat idle and acceleration to 30-40 mph five times. Smoothly accelerate and maintain a speed between 30 to 40 mph Smoothly accelerate and maintain a speed above 25 mph for 2 minutes. ![]() Trace 1: Standard Type – Make sure that your fuel level is between 50% and 85% full.įrom 6-8 hours of the vehicle being off (cold soak), idle for 5 minutesĭrive in city traffic naturally with stops and acceleration for 5 minutes. Smoothly accelerate and maintain a speed between 40 to 60 mph for 2 minutes.ĮGR System Monitor Drive Trace – Electronic Smoothly accelerate and maintain a speed between 30 to 45 mph for 2 minutes.ĮGR System Monitor Drive Trace – Vacuum controlled Smoothly accelerate and maintain a speed above 20 mph for 2 minutes. ![]() Smoothly acceerate and maintain a speed between 40 to 60 mph for 8 minutes. Note: Original 1996 Chrysler vehicles do not maintain OBD2 readiness after engine shutdown, however this is a fix that is available at a dealer.įor all drive cycles, make sure the check engine light (MIL) is off. If the MIL does not flash and remains fully lit, you are ready to go to the smog station.If the MIL flashes for 10 seconds, and then returns to being fully illuminated, the OBDII sensors are NOT READY and you need to complete the drive cycle.After 15 seconds, one of two things will happen.The check engine light f the (MIL) will turn on for 15 seconds. ![]()
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