Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2001METRO L4-079 1.3L VIN 2 MFIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORDESCRIPTION AND OPERATION
2001 Chevrolet Metro L4-079 1.3L VIN 2 MFI
Throttle Position Sensor: Description and Operation
2001 Chevrolet Metro L4-079 1.3L VIN 2 MFISECTION Description and Operation
Throttle Position (TP) Sensor:
The Throttle Position (TP) sensor detects the throttle valve opening. The TP sensor consists of a potentiometer that is connected to the throttle valve shaft on the throttle body.
A 5 volt reference voltage is applied to the TP sensor from the Powertrain Control Module (PCM). The voltage reading at the PCM changes as the throttle plate opening increases. The PCM can calculate the throttle valve opening by monitoring the TP sensor output voltage.
The PCM uses the TP sensor signal for one of the inputs in order to control the fuel injector, the idle speed control motor and the exhaust gas recirculation solenoid vacuum valve. The PCM also converts the TP sensor voltage input into an ON/OFF signal for use by the automatic transmission.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.