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.
Note On Intermittents
1991 Cadillac Seville STSSECTION Note On Intermittents
Drive vehicle and observe park/neutral parameter display. Stop vehicle and wiggle shifter. If display changes, check defective switch or intermittent short to ground.
CODE EO91, PCM VOLTAGE CHECK
| PCM Terminal | Voltage | |
|---|---|---|
| F8 | ||
| Switch Closed | 0-0.3 Volts | |
| Switch Open | Battery Voltage | |
| C10 | ||
| Switch Closed | 0-0.3 Volts | |
| Switch Open | Battery Voltage | |
| F7 | ||
| Switch Closed | 0-0.3 Volts | |
| Switch Open | Battery Voltage | |
| A2 | ||
| Switch Closed | 0-0.3 Volts | |
| Switch Open | Battery Voltage | |
RENDER: 1.0x
NO RELATED
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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.