The fuel cutoff system is Controlled through input from throttle position sensor, Engine Control Module (ECM) will cut fuel delivery during closed throttle deceleration. If you had a bad throttle positioning sensor it would not allow the injectors to operate properly. The electronic ignition system uses the Engine Control Module (ECM) for determining ignition timing (spark advance). The ECM determines ignition timing (spark advance) based on various input signals. Following input signals may be used: coolant temperature sensor, oxygen sensor, engine RPM, vehicle speed sensor, A/C switch, 4WD operation, airflow meter, knock sensor, vacuum sensor and cranking (starter) signal. Input signals may vary on model application. Integrated (ignition coil on distributor) and remote ignition coil designs are used depending on model.
On 2.4L, a single pick-up coil in the distributor delivers crankshaft position and engine RPM input signal to the ECM. The ECM monitors pick-up coil signal at NE or NE+ terminal. On all other models, crankshaft position and engine RPM input signals are delivered to the ECM by 2 pick-up coils in the distributor. Crankshaft position input signal is delivered to G, G+ or G1 (and G2 on some models) terminal of ECM, and engine RPM input signal is delivered to NE or NE+ terminal of ECM. See Figure.
On all models, ECM uses pick-up coil input signals to switch primary ignition circuit on and off. Primary circuit is turned off when ECM delivers a signal to ignitor on the IGT wire, causing ignition coil to fire the spark plug. After delivering a command to turn off primary circuit on the IGT wire, the ECM monitors IGF circuit to ensure primary switching occurred. See Figure.
Friday, October 27th, 2017 AT 11:40 AM