Pinpoint Test KT: Motor Electronics Cooling System (MECS) Pump: Introduction
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
TO PREVENT THE RISK OF HIGH-VOLTAGE SHOCK, ALWAYS FOLLOW PRECISELY ALL WARNINGS AND SERVICE INSTRUCTIONS, INCLUDING INSTRUCTIONS TO DEPOWER THE SYSTEM. THE HIGH-VOLTAGE HYBRID SYSTEM UTILIZES APPROXIMATELY 300 VOLTS DC, PROVIDED THROUGH HIGH-VOLTAGE CABLES TO ITS COMPONENTS AND MODULES. THE HIGH-VOLTAGE CABLES AND WIRING ARE IDENTIFIED BY ORANGE HARNESS TAPE OR ORANGE WIRE COVERING. ALL HIGH-VOLTAGE COMPONENTS ARE MARKED WITH HIGH-VOLTAGE WARNING LABELS WITH A HIGH-VOLTAGE SYMBOL. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
NOTE:
When using Output State Control for the MECS pump, do not leave the pump off for more than 2 minutes with the ignition ON.
NOTE:
Under normal operating conditions, the motor electronics cooling system should be able to maintain a temperature of approximately 11°C (20° F) over ambient temperature while driving.
This pinpoint test is intended to diagnose the following:
- MECS pump relay (14B192)
- harness circuits: MECS pump relay, vehicle power (VPWR)
- powertrain control module (PCM) (12A650)