Injector Control Circuit

Name of Code:
Injector Control Circuit

When Monitored:
With battery voltage greater than 12 volts, the auto shutdown relay energized, injector pulse width less than 10 ms, and engine speed less than 3,000 rpm.

Set Condition:
This trouble code takes 0.64 to 10.0 seconds to set when no inductive kick is sensed 0.18 ms after injector turn off, and with no other injectors on.

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.

Possible Causes:
- Open or shorted injector driver circuit
- Open injector
- Open ASD supply at injector
- PCM failure
- Connector terminals
- Connector wires