DTC P1441 - EVAP SYSTEM FLOW DURING NON-PURGE GMC Envoy I

Note. For circuit reference, see WIRING DIAGRAMS - 4.3L article.

Circuit Description

Evaporative (EVAP) emissions canister purge is controlled by a solenoid valve which allows ported vacuum to purge canister when energized by VCM. A vacuum switch in purge line is used to detect when system is being purged. VCM supplies and reads a 12-volt reference to switch. If switch is open (purge detected) when commanded by VCM, DTC P1441 is set.

Conditions for setting DTC

1. No HO2S, ECT, EGR, IAT, MAP, TP, VSS sensor DTCs set.
2. DTC P0125 not active.
3. ECT and IAT is greater than 39°F (4°C) but less than 86°F (30°C).
4. Fuel level 12.5-87.5 percent.
5. BARO greater than 72.5 kPa.
6. System voltage 10-17 volts.
7. VCM detects a continuous open purge flow condition during diagnostic test.