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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls - Powertrain DTC Charts & Descriptions - (Hybrid)) >> Diagnostic Trouble Code (DTC) Charts and Descriptions >> DTC P0102: Mass Or Volume Air Flow A Circuit Low Input

DTC P0102: Mass Or Volume Air Flow A Circuit Low Input

WARNING: This page is about a different variant/trim than selected.
P0102 - MASS OR VOLUME AIR FLOW A CIRCUIT LOW INPUT

Description:  The mass air flow (MAF) sensor circuit is monitored by the powertrain control module (PCM) for low air flow (or voltage) input through the comprehensive component monitor (CCM). If during key on engine running (KOER) the air flow (or voltage) changes below a minimum calibrated limit, the test fails.
Possible Causes: 
  • MAF sensor disconnected
  • MAF circuit open to PCM
  • VPWR open to MAF sensor
  • PWR GND open to the MAF sensor
  • MAF RTN circuit open to PCM
  • MAF circuit shorted to GND
  • Intake air leak (near the MAF sensor)
  • A closed throttle indication (throttle position sensor system)
  • Damaged MAF sensor
  • Damaged PCM
Diagnostic Aids:  A MAF V PID (MAF PID) reading less than 0.23 volts during KOER indicates a concern.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All - GO to PINPOINT TEST DC . GO to PINPOINT TEST DC .