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 MANUALSCHEVROLET1987HI-CUBE 6.2 J, 400/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 27 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 6.5L DIESEL)ENGINE SENSORS & SWITCHESENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 6.5L DIESELTHROTTLE POSITION (TP) SENSOR
1987 Chevrolet Hi-Cube 6.2 J, 400/M40
Throttle Position (TP) Sensor
1987 Chevrolet Hi-Cube 6.2 J, 400/M40SECTION Throttle Position (TP) Sensor
WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1994 GMC Yukon, 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Suburban, and 1994 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
- 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.
- TP sensor circuit malfunction should set a related trouble code. For further information, see appropriate TESTS W/CODES
article in this section below. Also see TP sensor adjustment in ADJUSTMENTS
- 6.5L DIESEL article in this section.
- G - TESTS W/CODES - 6.5L DIESEL (for "C" & "K" Series)
- G - TESTS W/CODES - 6.5L DIESEL (for "G" & "P" Series)
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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.