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.
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HOMESERVICE MANUALSMERCURY1998SABLE V6-3.0L DOHC VIN SREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSTESTING AND INSPECTIONDIAGNOSTIC TROUBLE CODE DESCRIPTIONSPOWER STEERING PRESSURE (PSP) SWITCH
1998 Mercury Sable V6-3.0L DOHC VIN S
Power Steering Pressure (PSP) Switch
1998 Mercury Sable V6-3.0L DOHC VIN SSECTION Power Steering Pressure (PSP) Switch
DESCRIPTION
Is used on certain applications to signal the powertrain control module when the power steering pressure exceeds a specific limit. Then the powertrain control module will adjust idle speed to compensate for this added load on the engine. This increase in engine rpm is used as an input to the PCM to adjust EPC pressure to the transaxle.
SYMPTOMS
- Failed ON - EPC slightly high, firm engagements, firm shifts, harsh coastdown shifts.
- Failed OFF - EPC pressure slightly low during increased loading of the vehicle power steering.
DTCs
P0552, P0553, P1550, P1650, P1651
Is used on certain applications to signal the powertrain control module when the power steering pressure exceeds a specific limit. Then the powertrain control module will adjust idle speed to compensate for this added load on the engine. This increase in engine rpm is used as an input to the PCM to adjust EPC pressure to the transaxle.
SYMPTOMS
- Failed ON - EPC slightly high, firm engagements, firm shifts, harsh coastdown shifts.
- Failed OFF - EPC pressure slightly low during increased loading of the vehicle power steering.
DTCs
P0552, P0553, P1550, P1650, P1651
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.