Output Signals
NOTE:
Vehicles are equipped with different combinations of computer-controlled components. Not all components listed below are used on every vehicle. For theory and operation on each output component, refer to the system indicated after component.
- A/C Clutch - See MISCELLANEOUS CONTROLS.
- Air Injection Control Solenoid - See EMISSION SYSTEMS.
- Canister Purge Solenoid - See EMISSION SYSTEMS.
- Computer Controlled Coil Ignition (C(3)I) - See IGNITION SYSTEM.
- Cooling Fan Relay - See MISCELLANEOUS CONTROLS.
- Digital EGR Valve - See EMISSION SYSTEMS.
- Direct Ignition System (DIS) - See IGNITION SYSTEM.
- EGR Control Solenoid - See EMISSION SYSTEMS.
- ESC Timing Retard - See IGNITION SYSTEM.
- EST Timing Control - See IGNITION SYSTEM.
- Fuel Injectors - See FUEL CONTROL.
- Fuel Pump & Fuel Pump Relay - See FUEL DELIVERY.
- HEI-EST Ignition - See IGNITION SYSTEM.
- HOT Light or Coolant TEMP Light - See MISCELLANEOUS CONTROLS.
- Idle Air Control (IAC) Valve - See IDLE SPEED.
- Idle Speed Control (ISC) Motor (4.9L Cadillac) - See IDLE SPEED.
- Integrated Direct Ignition System (IDIS) - See IGNITION SYSTEM.
- Self-Diagnostics - See appropriate G - TEST W/CODES article in this section.
- Serial Data - See appropriate G - TEST W/CODES article in this section.
- "SERVICE ENGINE SOON" Light - See appropriate G - TEST W/CODES article in this section.
- Shift Light - See MISCELLANEOUS CONTROLS.
- Torque Converter Clutch - See MISCELLANEOUS CONTROLS.