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Home >> GMC >> 1987 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Engine Controls - Theory & Operation - Gasoline) >> Computerized Engine Controls >> Input Devices >> Throttle Position (TP) Sensor

Throttle Position (TP) Sensor

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

TP sensor is a variable mechanical resistor connected directly to throttle shaft linkage. TP sensor has 3 wires connected to it. One is connected to a 5-volt reference voltage supply from PCM, another is connected to PCM ground and third is signal return which is monitored by PCM. Voltage signal from TP varies from closed throttle (0.5-1.0 volt) to wide open throttle (4.5-5 volts). PCM uses this signal to determine control of fuel, idle speed, spark timing and converter clutch. A problem in TP sensor circuit may set a related trouble code.

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