Circuit Description
WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
EVAP system is checked by applying vacuum to EVAP system and monitoring vacuum decay. Vehicle Control Module (VCM) monitors vacuum level by means of fuel tank vacuum sensor input. At a predetermined time, EVAP purge solenoid and EVAP vent solenoid are turned on. This allows engine vacuum to draw a small vacuum on entire EVAP system.
If VCM detects that EVAP purge solenoid driver circuit is grounded or EVAP purge solenoid is leaking, DTC P1441 is set.
Conditions required to set DTC are:
- No HO2S, ECT, IAT, MAP, TP, VSS sensor DTCs set.
- DTC P0125 not active.
- Fuel tank level is 12.5-87.5 percent.
- System voltage is 10-17 volts.
- BARO is greater than 72.5 kPa.
- ECT and IAT 41-84°F (5-29°C).
- IAT is not greater than 2.7°F (1.5°C) of ECT at engine start-up.
- ECT is not greater than 14.85°F (8.25°C) of IAT at engine start-up.