DTC P0440: EVAP System Malfunction: Notes

NOTE: Use illustration for circuit reference. See Fig 1.

Fig 1: Identifying EVAP Circuit

Courtesy of ISUZU MOTOR CO.

NOTE: EVAP Diagnostic Station (P/N J41413), or similar, is necessary for accurate diagnosis of EVAP system. This tool will be necessary for vacuum and pressurized leakdown testing of EVAP systems. It is equipped with 2 additional gauges to measure vacuum in inches of mercury (in. Hg), and to measure vapor flow in inches of water (in. H₂ O), within an EVAP circuit.