Engine Speed Control

Special Functions/TAC System

This function activates the idle speed override in 20 RPM, 100 RPM, and 500 RPM increments, from 600 RPM to 1700 RPM. The engine speed will remain in the commanded state until cancelled by the tool.

EVAP Purge Solenoid (PWM)

Special Functions/EVAP System

This function activates the 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 percent-100 percent. The system remains in the commanded state until cancelled by the tool or the fuel tank pressure (FTP) exceeds -24 mm Hg (-12 in H20).

EVAP Purge/Seal

Special Functions/EVAP System

This function activates two functions. One function increases or decreases the amount of purge by changing the duty cycle of the purge valve and commanding the vent ON, non-venting. The normal commanded state of both valves is NONE. The system will INCREASE or DECREASE the amount of EVAP purge valve opening by 10 percent increments within a range of 0 percent-100 percent. The second function seals the system after using the purge function to obtain a specific amount of fuel tank pressure (FTP). When activated, the purge valve is commanded to 0 percent and the vent valve is commanded ON, non-venting. Both functions remain in the commanded state until cancelled by the tool or the FTP exceeds -24 mm Hg (-12 in H20).

EVAP Service Bay Test

Special Functions/EVAP System

This function activates the Service Bay Test to verify the integrity of the EVAP System. The scan tool initiates the test when the following conditions are met:

EVAP Vent Solenoid

Special Functions/EVAP System

This function activates the EVAP vent solenoid. The normal commanded state is NONE. When commanded ON, the vent valve switches to non-venting. The system remains in the commanded state unless one of the following conditions occurs:

Fuel Pump Relay

Special Functions/Engine Output Controls

This function activates the fuel pump relay. The normal commanded state is NONE. When commanded ON/OFF, the 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 until cancelled by the scan tool.

Fuel Economy Test

Special Functions/Fuel System

When the Test is ENABLED the ECM calculates fuel economy based on throttle position, injector pulse width, vehicle speed and engine load.

Fuel Trim Reset

Special Functions/Fuel System

This function resets the long term fuel trim values and the rear oxygen sensors learned values.

Ignition System

Special Functions/Engine Output Controls

Important:  The spark tester must be connected to the ignition coil and a good ground before using this function.

This function activates the ignition control (IC) circuit for the selected ignition coil for 30 seconds. The scan tool initiates the test when the following conditions are met:

Control is not allowed again on the same coil until that ignition coil is allowed to cool for 60 seconds.

Intake Manifold Runner Control (IMRC) Solenoid

Special Functions/Engine Output Controls

This function activates the solenoid that supplies vacuum to the IMRC valve located in the intake manifold. The commanded states include NONE, ON and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool.

Intake Manifold Tuning (IMT) Valve

Special Functions/Engine Output Controls

This function activates the solenoid that supplies vacuum to the IMT valve located in the intake duct assembly. The commanded states include NONE, ON and OFF. When commanded ON or OFF the system remains in the commanded state until cancelled by the scan tool.

Malfunction Indicator Lamp (MIL)

Special Functions/Engine Output Controls/Dash Lamps

This function activates the malfunction indicator lamp (MIL). The commanded states include NONE, ON and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool.

Throttle Position

Special Functions/TAC System

This function opens the throttle plate in 25 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.

Reset Learned Values

Special Functions/Engine Output Controls

This function resets the long term fuel trim values, the rear oxygen sensors learned values and the crankshaft position variation learn values.