Circuit/System Description
WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
For an overview of the component/system, refer to: Electronic Component Description
| Circuit | Description |
|---|---|
| 5 V Reference | Regulated voltage supplied by the control module- K20 Engine Control Module |
| Signal 1 - Terminal 2@B303 Transmission Range Sensor | The control module input circuit has an internal resistance connected to 5 V- K71 Transmission Control Module |
| Signal 2 - Terminal 3@B303 Transmission Range Sensor | The control module input circuit has an internal resistance connected to 5 V K20 Engine Control Module |
| Low Reference | Grounded through the control module - K20 Engine Control Module |
| Component | Description |
|---|---|
| B303 Transmission Range Sensor | The hall-effect sensor has 2 separate PWM signal circuits. |
| 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 sensors, interprets the data and adjusts the engine actuators accordingly. |
| K71 Transmission Control Module | The control module contains a microprocessor used to process input data to control outputs.The control module receives information from a variety of sensors, switches and serial data information from other control modules. This information is used to control a combination of solenoid valves to obtain the correct line pressure, gear ratio and torque converter clutch operation. |
- The control module K71 uses the information from the sensor signal 1 to determine what transmission gear range the vehicle operator selected.
- The control module K20 uses the information from the sensor signal 2 to determine if the transmission is in neutral or park to enable the starter.