Neon L4-2.0L SOHC (1995)
Fuel Injector: Description and Operation
Injector Control Circuit
NAME OF CODE:
Injector Control Circuit
WHEN MONITORED:
With battery voltage greater than 12 volts, the auto shutdown (ASD) relay energized, injector pulse width less than 10 milliseconds, and engine
speed less than 3000 RPM.
SET CONDITION:
This trouble code takes 0.64 to 10.0 seconds to set when no inductive kick is sensed 0.18 milliseconds after injector turns off, and with no other
injectors on.
THEORY OF OPERATION:
Fuel injectors are high-impedance solenoids controlled by the Powertrain Control Module (PCM). Battery voltage is supplied by the ASD relay.
The injector ON time (pulse width) is controlled by the amount of time the PCM grounds the injector control circuit. By varying this time, more or
less fuel is allowed to flow through the injector.
POSSIBLE CAUSES:
-
Open or shorted injector driver circuit
-
Open injector
-
Open ASD supply at injector
-
Failed driver in PCM
