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 0.15 milliseconds after injector turn 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