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 Controls Ignition Relay

Special Functions/Engine Output Controls

Important: This function is only allowed with the ignition ON, engine OFF.

This function controls the engine controls ignition relay or MAIN relay. When commanded ON, the engine controls ignition relay will cycle ON/OFF for 3-5 seconds.

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 ECM.

IMT Valve

Special Functions/Engine Output Controls

Important: 

This function controls the intake manifold tuning (IMT) valve solenoid. When commanded ON, the IMT valve solenoid will cycle ON/OFF for 3-5 seconds. This output can also be monitored by observing the IMT valve actuator move as the solenoid allows vacuum to it.

ISC Actuator

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

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 malfunction indicator lamp (MIL) ON/OFF for 3-5 seconds. When commanded OFF with the ignition ON, engine OFF, the ECM turns the malfunction indicator lamp (MIL) ON/OFF for 3-5 seconds.

Reset ECM

Special Functions/Engine Output Controls/Reset Learned Values

This function resets the all values learned by the ECM.