Join Date: Feb 2008
Switch "ON": ( engine not running):
Open loop mode. PCM prepositions IAC motor based upon engine coolant temp. Gets info from MAP sensor, intake air temp, and TPS input. It activates auto shutdown relay, which activates fuel pump relay for 3 seconds unless engine is cranked. If engine doesnt crank, fuel pump relay ( via autoshutdown relay) is shut off.
At start up:
The computer gets info from the crank sensor, TPS, battery voltage, cam sensor, engine coolant sensor, IAT and Map. Based on those inputs, voltage is applied to the injectors.
2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.