Where is the evaporative emission control canister located?
The EVAP emissions control canister is located on the driver side, near the rear tires. Jack up the vehicle from the recommended jack placement and place the rear of the vehicle on jack stands for support. Make sure to keep pressure on the jack after lowering the vehicle onto the jack stands for extra safety.
How does the EVAP system work on a car?
As mentioned, the EVAP emissions system prevents fuel vapors from being released into the atmosphere. The heart of the system is the charcoal canister —a device that traps the fuel vapors when the engine is off. Once the engine is running and conditions are correct, the PCM commands the purge valve open to allow the vapors to enter the engine.
When to reset the Check Engine light after replacing an EVAP canister?
When a pressure issue is detected or excess vacuum is discovered in the fuel cell, the ECM detects the issue and triggers the Check Engine Light to come on. This light needs to be reset after replacing the EVAP emissions control canister if that is the source of the error code.
How do you replace an EVAP canister in a car?
To avoid stripping bolts, spray penetrating fluid onto the bolts and the clips that hold the EVAP canister onto the vehicle. Since this part has been exposed to road grime, water and, in some cases, salt; it’s probable that the bolts have rusted.
How does the evaporative emission system work on a car?
Although generic, the specific repair steps may vary depending on make/model. The Evaporative Emissions System (EVAP) allows fumes from the gas tank to enter the engine to be burned, rather than vented into the atmosphere as an emission. The purge valve solenoid is supplied switched battery voltage.
What’s the emissions code on my Grand Cherokee?
The Grand Cherokee 2002 isn’t passing emissions and code P0443 came up. So I replaced the canister purge valve and reset the computer (disconnected the battery then reconnected it) and the check engine light went off for about 10 miles a…
How does the ECM control the purge valve?
The ECM controls the valve by operating the ground circuit, opening the purge valve at specific times allowing these gasses to enter the engine. The ECM monitors the ground circuit as well, watching for faults. When the purge solenoid isn’t activated, the ECM should see a high voltage on the ground circuit.