Circuit/System Description
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
| Circuit | Description |
|---|---|
| B+ - Relay Coil | Supplied directly from the battery. |
| B+ - Relay Switch | Supplied directly from the battery. |
| Ignition - Component - Terminal 5 | Supplied from a relay. |
| Control - Relay Coil | The output circuit is switched to ground to activate the component. |
| Component | Description |
|---|---|
| K20 Engine Control Module | The control module contains a microprocessor used to process input data to control outputs. The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensor s, interprets the data and adjusts the engine actuators accordingly. |
| KR75 Engine Controls Ignition Relay | Relays are used to control a high power circuit with a low power signal. |
2 ignition voltage circuits supply the ECM. The 2 circuits are supplied by 1 relay(s): KR75 Engine Controls Ignition Relay
The ECM monitor s and compares the voltages supplied by the relay(s).