Fuel Shut-Off Mode

The PCM has the ability to completely turn all the injectors Off or selectively turn Off some of the injectors when certain conditions are met. These fuel shut-off modes allow the Northstar powertrain to protect itself from damage and also improve its driveability.

The PCM will disable all eight injectors under the following conditions:
^ Ignition Off (prevents engine run-on).
^ Ignition On but no ignition reference signal (prevents flooding or backfiring).
^ High engine speed (above red line).
^ High vehicle speed (above rated tire speed).
^ Extended high speed closed throttle coastdown (reduces emissions and increases engine braking).

The PCM will selectively disable up to four injectors under the following conditions:
^ Torque Management enabled (transaxle shifts or abusive maneuvers).
^ Traction Control enabled (in conjunction with front brakes applying).
^ Low coolant condition (protects engine from overheating).