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.
1987 Pontiac Fiero Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Diagnosis - 125C
- Description
- Trouble Shooting
- Testing & Diagnosis
- TCC Diagnostic Charts
- Notes
- Chart C-8 TCC Electrical Diagnosis - 2.0L & 2.5L TBI
- Code 24 Vehicle Speed Sensor (VSS) - 2.0L & 2.5L TBI
- Chart C-1A Park/Neutral Switch - 2.0L & 2.5L TBI
- Chart C-8, 125C TCC Electrical Diagnosis - 2.8L PFI
- Chart C-8, TCC Electrical Diagnosis - 3.0L PFI
- Code 24, Vehicle Speed Sensor (VSS) - PFI
- Chart C-1A, Park/Neutral Switch - PFI
Factory Service Tools
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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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