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Home >> GMC >> 1987 >> Forward Control 5.7 M, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Controls - System/Component Tests - Gasoline) >> Engine Sensors & Switches >> Engine Controls - System/Component Tests - Gasoline >> Throttle Position (TP) Sensor
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Throttle Position (TP) Sensor

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Rally Camper Special, 1994 GMC Rally, and 1994 GMC Forward Control. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install jumper wires to enable connection of a DVOM in parallel between TP sensor harness connectors. Connect DVOM positive lead to Dark Blue wire terminal. Connect negative lead to Black wire terminal. See Fig 1.
  2. Turn ignition on, engine off. Signal voltage should gradually change from less than one volt at closed throttle to about 5.0 volts at wide open throttle position. If reading is not as specified, replace TP sensor.
  3. TP sensor circuit malfunction should set a related trouble code. For further information, see appropriate SELF-DIAGNOSTICS article. Also see TP Sensor Adjustment in ADJUSTMENTS - GASOLINE article in the ENGINE PERFORMANCE section.
Fig 1: Typical Throttle Position (TP) Sensor Circuit
G90C15737Courtesy of GENERAL MOTORS CORP.
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