Why does p0446 cause fuel tank to crack?
Building their nests in the vent line blocks the flow, some of them so bad that they cause EVAP DTCs to be set, including P0446, and some so bad that they’ve caused canisters and fuel tanks to crack.
What is the resistance of a valve solenoid?
Most valve solenoid should measure between 30 Ω and 40 Ω, though some newer electronically-controlled valves may range between 2 Ω and 6 Ω. If resistance is as specified, 0 Ω or over 10 kΩ, replace the valve. If the valve works properly and is electrically sound, check the rest of the circuit between the ECM and the valve.
Why does the ECM open the purge valve?
In the case of the purge cycle, the ECM opens the purge valve and the vent control valve to allow engine intake vacuum to pull fuel vapors into the engine to be burned. The vent valve needs to be open to allow fresh air to flush out the charcoal canister, “cleaning” it of stored fuel vapors and making it ready for another charge.
What are the common causes of DTC p0446?
DTC P0446 is defined as “Evaporative Emission (EVAP) Vent Control Circuit Malfunction.” What are the common causes of code P0446 ? Depending on year, make, and model, DTC P0446 may have number of causes. Here are some of the most common.
Building their nests in the vent line blocks the flow, some of them so bad that they cause EVAP DTCs to be set, including P0446, and some so bad that they’ve caused canisters and fuel tanks to crack.
In the case of the purge cycle, the ECM opens the purge valve and the vent control valve to allow engine intake vacuum to pull fuel vapors into the engine to be burned. The vent valve needs to be open to allow fresh air to flush out the charcoal canister, “cleaning” it of stored fuel vapors and making it ready for another charge.
Most valve solenoid should measure between 30 Ω and 40 Ω, though some newer electronically-controlled valves may range between 2 Ω and 6 Ω. If resistance is as specified, 0 Ω or over 10 kΩ, replace the valve. If the valve works properly and is electrically sound, check the rest of the circuit between the ECM and the valve.