FUEL DELIVERY SYSTEM – V 19-2-10 DESCRIPTION AND OPERATION The ECM only initiates a leak diagnosis test every second time the criteria are met. The criteria areas follows: l Engine OFF with ignition switched OFF l Engine Control Module still inactive state or what is known as followup mode Main Relay energized, control module and ECM components online for extended period after key off) l Prior to Engine/Ignition switch OFF condition, vehicle must have been driven fora minimum of 20 minutes l Prior to minimum 20 minute drive, the vehicle must have been OFF fora minimum of 5 hours l Fuel Tank Capacity must be between 15 and 85% (safe approximation between 1/4 - 3/4 of a tank) l Ambient Air Temperature between -CC (FF ) l Altitude < 2500m (8,202 feet) l Battery Voltage between 11.5 and 14.5 Volts. When these criteria are satisfied every second time, the ECM will start the Fuel System Leak Diagnosis Test. The test will typically be carried out once a day i.e. once after driving to work in the morning, when driving home in the evening the criteria are once again met but the test is not initiated. The following morning, the test will run again.