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.
1995 Cadillac Eldorado BaseFACTORY OEM SERVICE PROCEDURE
Code P040, Open PSPS Circuit: Action
PCM turns on MIL.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks if PI85 will cycle from high to low to high. If PI85 stays low, check for open or short to ground in circuit. If PI85 stays high, check for short to voltage in circuit.
- Checks is circuit No. 495 is shorted to voltage or if power steering is faulty.
- Checks if circuit No. 741 or fuse D1 is open.
- Checks if power steering pressure switch is open.
- Checks if circuit No. 495 is open or if PCM is faulty.
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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