Function And Operation Principle
Based on information from various sensors, the PCM measures the fuel injection amount. The fuel injector is a solenoid-operated valve and the fuel injection amount is controlled by length of time that the fuel injector is held open. The PCM controls each injector by grounding the control circuit. When the PCM energizes the injector by grounding the control circuit, the circuit voltage should be low (theoretically 0 V) and the fuel is injected. When the PCM de-energizes the injector by opening control circuit, the fuel injector is closed and circuit voltage should momentarily peak.
CAUTION:
If an injector connector is disconnected for more than 46 seconds with engine running, the PCM will determine that the cylinder is misfiring and cut fuel supply. So be careful not to exceed 46 seconds. Turn the Ignition key off and wait 10 seconds to restore normal operation.