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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Automatic Transmission Cooling System - (Hybrid)) >> Diagnosis And Testing >> Transaxle Cooling >> Pinpoint Tests >> Pinpoint Test A: Motor Electronics Cooling System (MECS) Cooling Pump Fault >> Normal Operation

Normal Operation

WARNING: This page is about a different variant/trim than selected.

The Motor Electronics Cooling System (MECS) pump is electrically driven and controlled by the PCM through the MECS pump relay. The PCM energizes the MECS pump relay by pulling the MECS pump output to ground when the ignition is in the ON position.

This pinpoint test is intended to diagnose the following: 

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