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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> DTC Diagnosis >> DTC P1651: - Power Steering Pressure (PSP) Switch Input

DTC P1651: - Power Steering Pressure (PSP) Switch Input

DTC P1651: - POWER STEERING PRESSURE (PSP) SWITCH INPUT

Description:  The powertrain control module (PCM) counts the number of vehicle speed transitions from 0 to a calibrated speed. After a calibrated number of speed transitions, the PCM expects the PSP input to change. This DTC is set if the transition is not detected.
Possible Causes: 
  • Vehicle towed with the engine running
  • The power steering hydraulic concern was repaired but the DTC was not erased
  • PSP switch/shorting bar damaged
  • SIG RTN circuit open
  • PSP circuit open or shorted to SIGRTN
Diagnostic Aids:  Check if the vehicle was towed or a power steering repair was carried out. Observe the PSP PID while checking the wires for intermittent concerns.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All - - GO to Pinpoint Test FF .
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