The ECM activates the fuel pump for several seconds after the ignition switch is turned on to improve engine startability. If the ECM receives a engine speed signal from the crankshaft position sensor (POS) and camshaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate.
If you own a Nissan Sentra and know anything about working on cars, you've probably realized how blessed you are to own such an easy car to repair yourself. This handy video shows how to perform one piece of maintenance on the car quickly and easily, removing the crankshaft sensor. You'll need to do this if your sensor has corroded as the one in this video has.
well i change the camshaft sensors and crankshaft sensor and checked all 3 engine compartment grounds. i took to nissan last week and they found it was the IPDM (INTELLIGENT POWER DISTRIBUTION MODULE) cost for module was around $150 and for them to fix was $340.10 tax and all. they also did a recall fix on the engine fan that i wasn't aware of ...
The camshaft position sensor gathers information about the vehicle’s camshaft speed and sends it to the vehicle’s engine control module (ECM).The ECM uses this data to determine the timing of the ignition, as well as the timing of the fuel injection that the engine requires. Nissan North America, Inc. (Nissan) is recalling certain model year 2004 Pathfinder vehicles manufactured January 6, 2004, to July 19, 2004, and 2004-2006 Sentra vehicles manufactured January 7, 2004, to August 26, 2006. Upon deployment of the passenger side frontal air bag, excessive internal pressure may cause the inflator to rupture.