Fuel Shut-Off Mode

WARNING: This page is about a different car, the 2003 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

ECM has the ability to completely turn OFF all of the injectors or selectively turn OFF some of the injectors when certain conditions are met. These fuel shut-off modes allow the ECM to protect the engine from damage and also to improve the vehicles driveability.

ECM will disable all of the 6 injectors under the following conditions:

Ignition OFF. This prevents engine run-on.
Ignition ON but no ignition reference signal. This prevents flooding or backfiring.
A high engine speed, above redline.
A high vehicle speed, above rated tire speed.
The extended high speed closed throttle coast down - reduces the emissions and increases engine braking.

ECM will selectively disable the injectors under the following conditions:

The torque management enabled, transmission shifts or abusive maneuvers.
The traction control enabled, in conjunction with the front brakes applying.