Camshaft Actuator

Special Functions/CMP Actuator System

This function controls the selected camshaft actuator solenoid. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 40 crankshaft degrees. The scan tool initiates the test when the following conditions are met:

The system remains in the commanded state until cancelled by the scan tool.

Camshaft Actuator Solenoid

Special Functions/Engine Control Module/CMP Actuator System

This function controls the selected camshaft actuator solenoid. The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the camshaft actuator solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:

The system remains in the commanded state until cancelled by the scan tool.

Cylinder Power Balance

Special Functions/Engine Control Module/Fuel System

Important: The Misfire Current and Misfire History parameters may not increment when using this function.

This function disables the selected fuel injector. The normal commanded state is None. The scan tool initiates the test when the following conditions are met:

If the fuel injector was disabled for 30 seconds, fuel injector control is not allowed again on the same fuel injector for 60 seconds.

Engine Speed Control

Special Functions/Engine Control Module/Engine Speed/Throttle

This function controls the idle speed override in 25 RPM, 100 RPM, and 500 RPM increments, from the base idle speed to 1,400 RPM. The scan tool initiates the test when the following conditions are met:

The engine speed will remain in the commanded state until cancelled by the scan tool.

EVAP Purge Solenoid

Special Functions/Engine Control Module/Output Controls/EVAP System

Important: The EVAP Purge Solenoid Command parameter may not change states when using this output control.

This function controls the evaporative emission (EVAP) purge solenoid valve. The normal commanded state is NONE. The system will increase or decrease the amount of purge by changing the duty cycle of the purge valve in 10 percent increments within a range of 0-100 percent. The system remains in the commanded state until cancelled by the scan tool or the fuel tank pressure (FTP) sensor exceeds -24 mm Hg (-12 inch H20).

EVAP Purge/Seal (If Equipped)

Special Functions/Engine Control Module/Output Controls/EVAP System

Important: The EVAP Purge and Vent Solenoid Command parameters may not change states when using this output control.

This function activates both the EVAP purge solenoid valve and EVAP vent solenoid to seal the EVAP system. When activated, the purge valve is commanded to 0 percent and the vent valve is commanded ON, Not-venting. The normal commanded state for both solenoids is None. Both of the solenoids remain in the commanded state until cancelled by the scan tool or the FTP sensor exceeds -24 mm Hg (-12 inch H20).

EVAP Vent Solenoid (If Equipped)

Special Functions/Engine Control Module/Output Controls/EVAP System

Important: The EVAP Vent Solenoid Command parameter may not change states when using this output control.

This function controls the EVAP vent solenoid. The normal commanded state is NONE. When commanded ON, the vent valve switches to Not-venting. The system remains in the commanded state unless one of the following conditions occur:

Fuel Injector Balance

Special Functions/Engine Control module/Fuel System

This function enables the fuel injector in order to verify the correct fuel injector flow. The ECM will pulse the selected fuel injector when the following conditions are met:

The selected fuel injector can only be flowed/pulsed once per ignition cycle.

Fuel Pump Relay

Special Functions/Engine Control Module/Output Controls/Fuel Pump

This function controls the fuel pump relay. The normal commanded state is NONE. The scan tool initiates the test when the following conditions are met:

When commanded ON/OFF, the engine control module (ECM) turns the fuel pump relay ON/OFF. If the engine is running and the fuel pump relay is commanded OFF, the engine will stall. The system remains in the commanded state for about 2 seconds or until cancelled by the scan tool or the ECM detects a vehicle speed.

Fuel Trim Reset

Special Functions/Engine Control module/Fuel System

This function resets the fuel trim data and the learned values for the rear heated oxygen sensors.

Idle Learn Reset

Special Functions//Engine Control Module/Module Setup

This function allows the throttle position and the idle speed to be relearned by the ECM, once the following conditions have been met.

IMRC Solenoid (If Equipped)

Special Functions//Engine Control Module/Output Controls

This function controls the intake manifold runner control (IMRC) solenoid. The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the IMRC solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:

The system remains in the commanded state until cancelled by the scan tool.

Loop Status

Special Functions//Engine Control Module/Output Controls

This function controls the heated oxygen sensor (HO2S) loop status. The commanded states include NONE, OPEN, and CLOSED. The normal commanded state is NONE. The loop status changes as commanded, OPEN or CLOSED.

The system remains in the commanded state until cancelled by the scan tool.

Malfunction Indicator Lamp

Special Functions//Engine Control Module/Output Controls

This function controls the malfunction indicator lamp (MIL). The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the MIL ON/OFF. The system remains in the commanded state until cancelled by the scan tool.

Throttle Blade Control

Special Functions/Engine Control Module/Engine Speed/Throttle

This function controls the throttle valve in 10 percent increments. The scan tool initiates the test when the following conditions are met:

The system remains in the commanded state until cancelled by the scan tool.