For 1990-2009 cars

Scan Tool Output Control | Additional Menu Selection(s) | Description
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A/C Relay | Special Functions/Engine Output Controls | Important: This function is only allowed with the ignition ON, engine OFF. This function controls the A/C compressor relay. When commanded ON, the A/C compressor will cycle ON/OFF for 3-5 seconds.
EGR Solenoid | Special Functions/Engine Output Controls | Important: This function is only allowed with the ignition ON, engine OFF. This function controls the exhaust gas recirculation (EGR) solenoid. When commanded ON, the EGR solenoid will cycle from 0-100 percent for 3-5 seconds. This output can also be monitored on the scan tool by observing the EGR Position Sensor data parameter.
Engine Control Ignition Relay | Special Functions/Engine Output Controls | Important: This function is only allowed with the ignition ON, engine OFF. This function controls the engine control ignition relay or MAIN relay. When commanded ON, the engine control ignition relay will cycle ON/OFF for 3-5 seconds.
EVAP Purge Solenoid | Special Functions/Engine Output Controls | Important: This function is only allowed with the ignition ON, engine OFF. This function controls the evaporative emission (EVAP) purge solenoid. When commanded ON, the EVAP purge solenoid will cycle ON/OFF for 3-5 seconds. This output can also be monitored on the scan tool by observing the EVAP Purge Solenoid Command data parameter.
Fan High | Special functions/Engine Output Controls/Fan Controls | Important: This function is only allowed with the ignition ON, engine OFF. This function controls the high speed cooling fan relay. When commanded ON, the cooling fan will turn ON at high speed for 5 seconds.
Fan Low | Special functions/Engine Output Controls/Fan Controls | Important: This function is only allowed with the ignition ON, engine OFF. This function controls the low speed cooling fan relay. When commanded ON, the cooling fan will turn ON at low speed for 5 seconds.
Fuel Pump Relay | Special Functions/Engine Output Controls | Important: This function is only allowed with the ignition ON, engine OFF. This function controls the fuel pump relay. When commanded ON, the fuel pump relay will cycle ON/OFF for 3-5 seconds.
Idle Learn Reset | Special Functions/Engine Output Controls/Reset Learned Values | This function resets the base idle value learned by the engine control module (ECM).
ISC Actuator - If Equipped | Special Functions/Engine Output Controls | Important: This function is only allowed with the ignition ON, engine OFF. This function controls the idle speed control (ISC) actuator. The ECM actuates the ISC actuator for 3-5 seconds when commanded ON. This output can also be monitored on the scan tool by observing the TP Sensor data parameter.
ISC System - If Equipped | Special Functions/Engine Output Controls/Reset Learned Values | This function resets the learned values for the idle speed control (ISC) system in the ECM.
Malfunction Indicator Lamp | Special Functions/Engine Output Controls | This function controls the malfunction indicator lamp (MIL). When commanded ON with the engine running, the ECM turns the (MIL) ON/OFF for 3-5 seconds. When commanded OFF with the ignition ON, engine OFF, the ECM turns the MIL ON/OFF for 3-5 seconds.
Reset ECM | Special Functions/Engine Output Controls/Reset Learned Values | This function resets all the values learned by the ECM.