Cylinder Power Balance

Fuel System

Enables/disables a cylinder by turning OFF the fuel injector to the cylinder.

The fuel injector is normally enabled. The control module disables the fuel injector when the following conditions are met:

When DISABLE is selected, the control module turns the injector OFF for 30 seconds.

EGR Solenoid

Output Control

Activates the exhaust gas recirculation (EGR) solenoid in 10 percent increments from 0-100 percent for a maximum of 30 seconds at 100 percent.

Engine Controls Ignition Relay

Output Control

Activates the Engine Controls Ignition Relay. The commanded states include NONE, ON, and OFF. The normal commanded state is NONE. The system remains in the commanded state until cancelled by the tool.

Engine Speed Control

Engine Speed/Throttle

Activates the throttle actuator control (TAC) system to change engine RPM. The normal commanded state is None. To enable the RPM control, all instruction on the scan tool must be completed. The system will increase or decrease the RPM within a range of 400-2,200 RPM. The set step value changes the RPM by increments of 25 RPM, 100 RPM, and 500 RPM. The system remains in the commanded state until cancelled by the scan tool.

EVAP Purge/Seal

Output Control/EVAP System

Simultaneously activates the purge solenoid in 10 percent increments from 0 to 100 percent and the vent solenoid. The device control will be aborted and inhibited if the FTP sensor exceeds 19 mm Hg (10 in H2O).

EVAP Purge Solenoid

Output Control/EVAP System

Activates the purge solenoid in 10 percent increments from 0 to 100 percent. The device control will be aborted and inhibited if the fuel tank pressure (FTP) sensor exceeds 19 mm Hg (10 in H2O).

EVAP Service Bay Test

Service Bay Test

Activates the on-board EVAP diagnostic test.

EVAP Vent Solenoid

Output Control/EVAP System

Activates the vent solenoid. The device control will be aborted and inhibited if the FTP sensor exceeds 19 mm Hg (10 in H2O).

Fuel Injector Balance

Fuel System

Activates the fuel injector in order to verify proper fuel injector flow. The ECM will pulse the selected injector when the ignition is ON with the engine OFF, and when the instructions on the scan tool have been completed. The selected fuel injector can only be flowed/pulsed once per ignition cycle.

Fuel Pump Relay

Output Control/Fuel Pump

Activates the fuel pump relay for 2 seconds. Also turns fuel pump ON and OFF while engine is running.

Fuel Trim Enable

Fuel System

Disables the ECMs ability to learn new fuel trim parameters. The commanded states are NONE, ENABLED, DISABLED. The normal commanded state is NONE. The system remains in the commanded state until cancelled by the scan tool.

Fuel Trim Reset

Fuel System

Activates the reset of fuel trim data in all fuel trim cells.

Idle Spark

Output Control/Spark Control

Disables and enables idle spark advance with the engine running.

Loop Status

Output Control

Controls the system loop status. The commanded states include NONE, OPEN, or CLOSED. The normal commanded state is NONE. When commanded OPEN or CLOSED, the system remains in the commanded state until cancelled by the scan tool.

Malfunction Indicator Lamp

Output Control

Activates the malfunction indicator lamp (MIL). The MIL will remain illuminated until cancelled by the scan tool.

Misfire Graphic

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Graphs the accumulated misfires occurring in each cylinder. The scan tool allows for a reset of the misfire graph.

Spark Retard

Output Control/Spark Control

Controls the amount of spark retard. The scan tool will command an increase or decrease in the amount of spark retard in 1 degree increments, within a range of 1-10 degrees. The normal commanded state is none.

Throttle Position

Engine Speed/Throttle

Operates TAC motor in 10 percent increments to open or close the throttle blade. The test operates during key ON, engine OFF.