Throttle Position Sensor: Description and Operation

Throttle position is detected by the [1][2]throttle position sensor (TPS) (4) which reports to the ECM. The closed throttle position switch (CTPS) (idle switch) is integral to the throttle position sensor.

Fig. 1 EMS System Schematic:

1. Intake Air Temperature Sensor
2. A-Bank Air Cleaner
3. B-Bank Air Cleaner
4. [1][2]Throttle Position Sensor
5. A-Bank Idle Air Control Valve
6. B-Bank Idle Air Control Valve
7. A-Bank Evap. Emission Purge Control Solenoid Valve
8. B-Bank Evap. Emission Purge Control Solenoid Valve
9. Evap. Emission Purge Control Canister
10. A-Bank Manifold Absolute Pressure Sensor
11. A-Bank Fuel Filter
12. B-Bank Manifold Absolute Pressure Sensor
13. B-Bank Fuel Filter
14. Camshaft Position Sensor
15. Engine Position Sensor
16. Engine Speed Sensor
17. A-Bank Fuel Injectors
18. B-Bank Fuel Injectors
19. Fuel Pressure Regulator
20. Fuel Tank
21. Main Fuel Pump
22. Secondary Fuel Pump
23. Fuel Level Sensor
24. Engine Coolant Temperature Sensor
25. A-Bank Ignition Amplifier
26. B-Bank Ignition Amplifier
27. A-Bank Ignition Coil
28. B-Bank Ignition Coil
29. A-Bank Upstream Heated Oxygen Sensor
30. B-Bank Upstream Heated Oxygen Sensor
31. A-Bank Downstream Heated Oxygen Sensor
32. B-Bank Downstream Heated Oxygen Sensor
33. Secondary Air Injection Pump
34. Secondary Air Injection Switching Valve
35. Vacuum Solenoid Valve
36. A-Bank Secondary Air Injection Check Valve
37. B-Bank Secondary Air Injection Check Valve
38. Ignition Supply
39. Engine Control Module
40. Malfunction Indicator Lamp / Instrument Pack
41. Battery
42. Cranking Signal
43. Security and Locking Control Module
44. PDU / Generic Scan Tool
45. Transmission Control Module (5 lines)
46. Air Conditioning Control Module (4 lines)
47. Park Neutral Switch
48. Power Steering Pressure Switch