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P0528 - Fan Speed Sensor Circuit No Signal

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P0528 - FAN SPEED SENSOR CIRCUIT NO SIGNAL

Description:  The powertrain control module (PCM) uses the fan speed sensor (FSS) input to monitor the cooling fan clutch speed. If the indicated fan speed is lower than the calibrated value during the key on engine running (KOER) self-test, the DTC is set.
Possible Causes: 
  • FSS VPWR circuit open in the harness
  • FSS PWRGND circuit open in the harness
  • FSS circuit open in the harness
  • FSS circuit short to voltage or ground in the harness
  • Damaged FSS sensor
  • Damaged PCM
Diagnostic Aids:  Visually inspect the cooling fan clutch for damage or obstruction.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All refer to PINPOINT TEST HV .
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