DTC P0611: Fuel Injector Control Module Performance: General Description: General Description

For each Injector Cycle, the Powertrain Control Module (ECM) has four phases.

First, the ECM "Pre-energizes" the injector circuit with 12 volts for a specified amount of time.

Then, the ECM sends a "peak" voltage of 55 volts, which causes the Injector to begin mechanically opening.

The ECM will then "hold" the current at a lower voltage until the injector is completely open.

Once the injector is completely open, the ECM will "duty cycle" the current to maintain the open position.

The length of the duty cycle will vary due to RPM and load conditions.

The injector will quickly close once the ECM discontinues current.