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.
2006 Mercury Mariner 4WD V6-3.0L VIN 1FACTORY OEM SERVICE PROCEDURE
Tests FF: Power Steering Pressure (PSP) Switch
PINPOINT TEST FF: POWER STEERING PRESSURE (PSP) SWITCH
WARNING: Crown Victoria Police Interceptor vehicles equipped with fire suppression system, refer to Section 419-03 for Important Safety Warnings. Failure to follow these instructions may result in personal injury.
This pinpoint test is intended to diagnose the following:
^ power steering pressure switch (3N824)
^ harness circuits: PSP and SIGRTN
^ powertrain control module ( PCM) (12A650)
Reference:
Reference:
PCM Connector
Reference:
Shorting Bar for Harness Circuit without PSP Switch (typical)
Reference:
FF1 - FF3:
FF4 - FF5:
FF6 - FF7:
FF8:
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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