Pinpoint Test KT: Motor Electronics Cooling System (MECS) Pump: Introduction
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. 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, vehicle power (VPWR)
- powertrain control module (PCM) (12A650)
MECS PUMP RELAY CONNECTOR PINS REFERENCE CHART
| Pin | Circuit |
|---|---|
| 3 | VPWR (Vehicle Power) |
| 2 | MECSPR (Motor Electronics Cooling System Pump Relay) |
PCM CONNECTOR PINS REFERENCE CHART
| Pin | Circuit |
|---|---|
| 149 | MECSPR (Motor Cooling System Pump Relay |