The control module monitors the fuel tank pressure (FTP) sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time. The control module will command the EVAP canister vent solenoid valve ON, closed, and command the EVAP canister purge solenoid valve ON, open, with the engine running, allowing engine vacuum into the EVAP system. This tests for large leaks and blockages in the evaporative emission (EVAP) system. The control module uses several tests to determine if the EVAP system is leaking. The air/fuel vapor mixture continues through the EVAP purge pipe and EVAP canister purge solenoid valve into the intake manifold to be consumed during normal combustion. ![]() Fresh air is drawn through the canister, pulling fuel vapors from the carbon. With the EVAP canister vent solenoid valve OFF, open, fresh air will be drawn through the solenoid valve and vent line to the EVAP canister. At an appropriate time, the control module will command the EVAP canister purge solenoid valve ON, open, allowing engine vacuum to be applied to the EVAP canister. The EVAP canister stores the fuel vapors until the engine is able to use them. Excess pressure is vented through the vent line and EVAP canister vent solenoid valve to atmosphere. Carbon in the canister absorbs and stores the fuel vapors. Fuel tank vapors are allowed to move from the fuel tank, due to pressure in the tank, through the vapor pipe, into the EVAP canister. The evaporative emission (EVAP) control system limits fuel vapors from escaping into the atmosphere. I'll post this information here just to have it here.ĮVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM DESCRIPTION The only other big thing in the air is, assuming no codes show up, if the PCM is not deciding to run the EVAP purging. how many miles have been logged since the last DTC clearing? EVAP usually wants to take a while. Is it possible that the PCM got a tune and those codes/tests turned off? The guy I bought it from seemed to be an enthusiast since the truck is lifted and it had a K&N filter (now a Green filter). I fixed a few other issues like a bad MAF and post cat O2 sensor but did nothing to the evap system except the cap (it was broken). All others were either green (pass) or red (failed). The gas cap is a new ACDelco.Ĭhecking the test results, the ones for evap just say "Test either not run or failed to complete" and is just in black. I've been driving the truck a few days from 3/4 tank to almost empty and still not getting it. ![]() I'm not getting any DTC codes, no MIL, just keep getting "Incomplete" for the evap system in Torque. All systems have to run through the required cycles and have passed. ![]() I just want to get my 06 9-7x 5.3L to pass the e-test, which is just a check for no codes and I/M readiness.
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