Injector Control Circuit

WHEN MONITORED
With battery voltage greater than 12 volts, auto shutdown relay energized, injector pulse width less than 10 ms, and engine speed less than 3000 RPM

SET CONDITION
There is no inductive kick sensed 0.18 ms after injector turn off with no other injectors on.

This code takes 0.64 to 10.0 seconds to set.

THEORY OF OPERATION
Fuel injectors are high impedance solenoids controlled by the 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.


PROBABLE CAUSES
- Open or shorted injector control circuit
- Open injector
- Open ASD supply at injector
- Failed driver in PCM