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.
1999 Chevrolet Pickup C2500, 2D Pickup, 7.4 J, AutomaticFACTORY OEM SERVICE PROCEDURE
Throttle Position (TP) Sensor
NOTE:
On 6.5L diesel engines, throttle control is electronic with NO mechanical link from engine to accelerator pedal. The PCM monitors the position of accelerator pedal based on signals from a nonadjustable Accelerator Pedal Position (APP) module. The APP module is mounted above the accelerator pedal.
THROTTLE POSITION (TP) SENSOR VOLTAGE (1)
| Application | Voltage | ||||
|---|---|---|---|---|---|
| 1.6L | .50-.80 | ||||
| 2.0L | (2) | ||||
| 2.2L | .20-.90 | ||||
| 3.4L | .20-.74 | ||||
| 4.3L | .47 | ||||
| 4.8L, 5.3L & 6.0L | .40-.90 | ||||
| 5.0L & 5.7L | .51 | ||||
| 7.4L | .47 | ||||
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Factory Service Tools
Use the Manual With the Right Hardware
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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.
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