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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1055 (Automatic Transmission Cooler - (Hybrid)) >> Diagnostic Tests >> Transaxle Cooling >> Pinpoint Tests >> Pinpoint Test A: Motor Electronics Cooling System (MECS) Cooling Pump Fault >> PINPOINT TEST A: Motor Electronics Cooling System (MECS) COOLING PUMP FAULT

PINPOINT TEST A: Motor Electronics Cooling System (MECS) COOLING PUMP FAULT

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. A1 CHECK FOR DTCs 
    • Connect the diagnostic tool.
    • Enter the following diagnostic mode on the diagnostic tool: RETRIEVE
    • Carry out the PCM on-demand self test.
    • Are DTCs retrieved? 
    1. YES  : REFER to Introduction - Gasoline Engines article.
    2. NO  : Go to  A2.
  2. A2 CHECK PDB FUSE 14 (10A) 
    • Check PDB fuse 14 (10A).
    • Are the fuses okay? 
    1. YES  : Go to  A3.
    2. NO  : REPAIR circuit CB108 (GY/YE) for a short to ground. TEST the system for normal operation.
  3. A3 CHECK THE MECS COOLANT PUMP AND WIRING FOR DAMAGE 
    • Disconnect: MECS coolant pump C1466
    • Check the MECS coolant pump, wiring and harness connector for:
      • pushed-out connector pins.
      • bent connector pins.
      • corrosion.
      • broken or missing wiring insulation.
    • Is the MECS coolant pump relay, harness connector and wiring OK? 
    1. YES  : Go to  A4.
    2. NO  : REPAIR or INSTALL new components as necessary. TEST the system for normal operation.
  4. A4 CHECK THE MECS PUMP RELAY (PDB RELAY 31D) HARNESS CONNECTOR AND WIRING 
    • Disconnect: PDB Relay 31D
    • Check the MECS coolant pump relay (PDB relay 31D) harness connector and wiring for:
      • pushed-out connector pins.
      • bent connector pins.
      • corrosion.
      • broken or missing wiring insulation.
    • Is the MECS coolant pump relay (PDB relay 31D) harness connector and wiring OK? 
    1. YES  : Go to  A5.
    2. NO  : REPAIR or INSTALL new components as necessary. TEST the system for normal operation.
  5. A5 CHECK THE MECS COOLANT PUMP RELAY (PDB RELAY 31D) 
    • Carry out the relay component test. Refer to appropriate COMPONENT TESTING article.
    • Is MECS pump relay (PDB relay 31D) OK? 
    1. YES  : Go to  A6.
    2. NO  : INSTALL a new MECS pump relay (PDB relay 31D). TEST the system for normal operation.
  6. A6 CHECK CIRCUIT CB108A (GY/YE) FOR AN OPEN 
      Fig 1: Checking Circuit For Open
      GF0025242Courtesy of FORD MOTOR CO.
    • Measure the resistance between MECS coolant pump C1466-2, harness side and PDB MECS coolant pump relay 31D, circuit CB108A (GY/YE) socket.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  7. A7 CHECK CIRCUIT GD120 (BK/GN) FOR AN OPEN 
      Fig 2: Checking Circuit For Open
      GF0025243Courtesy of FORD MOTOR CO.
    • Measure the resistance between MECS coolant pump 1466-1 circuit GD120 (BK/GN) harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new MECS coolant pump. REFER to Motor Electronics Pump . TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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