Theory Of Operation

The Electronic Throttle Control (Etc) System Uses Two Throttle Position Sensors (Tps) To Monitor The Throttle Blade Position. Tps 1 And Tps 2 Are Located Within The Throttle Body Assembly. Each Sensor Has Its Own Signal Circuit (Tps 1 Or Tps 2). Both Sensors Share A Common 5-Volt Reference Circuit (Supply) And A Common Sensor Ground. Each Signal Circuit Provides The Powertrain Control Module (Pcm) With A Signal Voltage Proportionate To Throttle Blade Movement. Normally Operating Sensor Signals Are Opposing To Each Other In The Following Manner:

• Tps 1  Voltage Starts Low, Approximately 0.5 Volts At Closed Throttle,  And Increases To Approximately 4.5 Volts At Wide Open Throttle  .
• Tps 2  Voltage Starts High, Approximately 4.3 Volts At Closed Throttle,  And Decreases To Approximately 0.7 Volts At Wide Open Throttle  .