For 1990-2009 cars

Scan Tool Output Control | Additional Menu Selection(s) | Description
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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 vehicle speed is 0 km/h (0 mph).

• | The transmission is in park or neutral.

• | The engine speed is between 1,000-1,400 RPM.

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

Camshaft Actuator Solenoid | Special Functions/Engine Output Controls/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:

• | Turn the ignition switch ON, with the engine OFF.

• | The engine speed is not detected.

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:

• | The engine is operating and the engine idle is stable.

• | The vehicle speed is 0 km/h (0 mph).

• | There are no vehicle speed sensor DTCs set.

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/ Throttle Actuator Control (TAC) System | 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 transmission is in park or neutral.

• | The engine speed is less than 1,000 RPM.

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

EVAP Purge Solenoid | Special Functions/Output Controls/EVAP System | Important: The EVAP Purge Solenoid Command parameter may not change states when using this output control. This function controls 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 0-100 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 H2O).
EVAP Purge/Seal | Special Functions/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 H2O).
EVAP Test | Service Bay Test | 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:

• | All instructions on the scan tool have been completed.

• | The engine coolant temperature is below a specified value.

• | No EVAP system DTCs are set.

EVAP Vent Solenoid | Special Functions/Output Controls/EVAP System | Important: The EVAP Vent Solenoid Command parameter may not change states when using this output control. This function controls the evaporative emission (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 occur:

• | Cancelled by the scan tool

• | The EVAP canister purge solenoid is more than 0 percent, and the FTP sensor exceeds -24 mm Hg (-12 inch H2O).

Fuel Injector Balance | Special Functions/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:

• | All instruction on the scan tool are completed.

• | A fuel injector is selected.

• | Turn the ignition switch ON, with the engine OFF.

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

Fuel Pump | Special Functions/Output Controls | 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:

• | There are no vehicle speed sensor DTCs set.

• | The vehicle speed is 0 km/h (0 mph).

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/Fuel System | This function resets the fuel trim data and the learned values for the rear heated oxygen sensors.
Idle Learn Reset | Special Functions/Throttle Actuator Control (TAC) System | This function allows the throttle position and the idle speed to be relearned by the ECM, once the following conditions have been met:

• | Turn the ignition switch ON, with the engine OFF.

• | The engine coolant temperature (ECT) is between 5-85°C (41-185°F).

• | No TAC system DTCs are set.

Intake Manifold Runner Control (IMRC) Solenoid | Special Functions/Output Controls | This function controls the intake manifold runner control (IMRC) solenoid. The normal commanded state is NONE. When commanded ON/OFF, the engine control module (ECM) turns the IMRC solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:

• | There are no vehicle speed sensor DTCs set.

• | The vehicle speed is 0 km/h (0 mph).

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

Loop Status | Special Functions/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/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 Control | Special Functions/Throttle Actuator Control (TAC) System | This function controls the throttle valve in 10 percent increments. The scan tool initiates the test when the following conditions are met:

• | There are no vehicle speed sensor DTCs set.

• | The vehicle speed is 0 km/h (0 mph).

• | Turn the ignition ON, with the engine OFF.

• | The ECM is not commanding a throttle learn.

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