Circuit Description

WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport and 2002 Isuzu Rodeo. However, it is still accessible from the selected car via links, so may be relevant.

Fuel level is an important input to PCM for Enhanced Evaporative System Diagnosis (EESD). Fuel level information is needed by PCM to determine volume of fuel in fuel tank. Fuel level affects rate of change in air pressure in EVAP system. Fuel sending unit is a float in fuel tank which moves a wiper across a variable resistor. Low fuel level causes high resistance in fuel sending unit, and is recognized by PCM as corresponding low voltage. If PCM detects a continuous open or high resistance in fuel level sensor or circuit, DTC P0464 will set.

When DTC sets, PCM illuminates MIL as soon as fault was detected. PCM will store conditions present when DTC was set as FREEZE FRAME data in the FAILURE RECORDS data. A history DTC is set.

PCM will turn MIL off on third consecutive trip cycle during which diagnostic runs and fault is no longer recognized. A history DTC will clear after 40 consecutive ignition cycle which diagnostic runs and fault is no longer recognized. DTC can be cleared with scan tool, or by disconnecting battery voltage feed to PCM.