Fuel Shut-Off Mode

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

The PCM will disable all eight injectors under 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 six injectors under 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).