Output Functionality

PCM outputs are tested for functionality in addition to testing for opens and shorts. When the PCM provides a voltage to an output component, it can verify that the command was carried out by monitoring specific input signals for expected changes. For example, when the PCM commands the Idle Air Control (IAC) Motor to a specific position under certain operating conditions, it expects to see a specific (target) idle speed (RPM). If it does not, it stores a DTC.

PCM outputs monitored for functionality include:

• Fuel Injectors
• Ignition Coils
• Torque Converter Clutch Solenoid
• Idle Air Control
• Purge Solenoid
• EGR Solenoid
• Radiator Fan Control
• Trans Controls