Ignition Switch On (Engine Not Running)

This is an open loop mode. PCM pre-positions IAC motor based on engine coolant temperature. PCM determines atmospheric pressure from MAP sensor and determines basic fuel strategy. PCM modifies fuel strategy according to intake air temperature, coolant temperature and throttle position sensor inputs. PCM activates auto shutdown relay, which in turn activates fuel pump for only 3 seconds unless engine is cranked. Fuel pump relay also energizes HO2S heater element for approximately 2 seconds unless engine is cranked, but PCM does not use HO2S input to calibrate air/fuel ratio during this mode.