Fuel Control: Notes
WARNING: This page is about a different car, the 1998 Infiniti Q45 and 1998 Infiniti I30. However, it is still accessible from the selected car via links, so may be relevant.
PCM controls fuel system by varying fuel injector pulse width and duration based upon sensor input signals. If feedback system does not function properly, check A/C clutch signal, battery voltage, closed throttle position switch, Crankshaft Position Sensor (CKP), EGR temperature sensor, Engine Coolant Temperature (ECT), Heated Oxygen Sensors (HO2S), ignition (START) signal, Mass Airflow (MAF) sensor, park/neutral switch, power steering pressure switch, secondary throttle sensor, sub-crankshaft position sensor, Throttle Position (TP) sensor, Vehicle Speed Sensor (VSS) input signals before replacing PCM.