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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 P0723: - Output Shaft Speed (OSS) Sensor Circuit Intermittent

DTC P0723: - Output Shaft Speed (OSS) Sensor Circuit Intermittent

DTC P0723: - OUTPUT SHAFT SPEED (OSS) SENSOR CIRCUIT INTERMITTENT

Description:  The OSS sensor signal to the powertrain control module (PCM) is irregular or interrupted.
Possible Causes: 
  • Harness connector not correctly seated
  • Harness intermittently shorted or open
  • Harness connector damaged
  • OSS sensor damaged, or not installed correctly
Diagnostic Aids:  Verify harness and connector integrity.
Verify correct installation of the OSS sensor.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Manual Transmission - - GO to Pinpoint Test DP .
Automatic Transmission Refer to the AUTOMATIC TRANSAXLE/TRANSMISSION - 5R55S Cooling Symptom Chart, Diagnostic Trouble Code (DTC) Index to continue diagnosis.