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.

Evaporative Emission (EVAP) system is checked by applying vacuum to EVAP system and monitoring vacuum decay. Powertrain Control Module (PCM) 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.

Conditions for setting this DTC are:

BARO is greater than 75 kPa.
IAT 41-84°F (5-29°C).
ECT 41-84°F (5-29°C) at engine start-up.
IAT is not greater than 2°F (1°C) of ECT at engine start-up.
ECT is not greater than 2°F (1°C) of IAT at engine start-up.
Fuel tank level is 26-74 percent.
TP sensor is 7-35 percent.
EVAP solenoid is at 50 percent PWM within 65 seconds of engine run time.
EVAP system unable to detect vacuum during diagnostic test.