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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2375 (Automatic Transaxle Cooling (ECVT) (Hybrid)) >> Diagnosis And Testing >> Transaxle Cooling >> Pinpoint Tests >> Pinpoint Test A: MECS Cooling Pump Fault >> Pinpoint Test A: MECS Cooling Pump Fault

Pinpoint Test A: MECS Cooling Pump Fault

WARNING: This page is about a different car, the 2010 Mercury Milan and 2010 Ford Fusion. 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 scan tool.
    • Enter the following diagnostic mode on the scan tool: RETRIEVE.
    • Carry out the PCM on-demand self test.
    • Are DTCs retrieved? 
  2. A2 CHECK BJB FUSE 13 (15A) 
    • Check fuse: BJB  13 (15A).
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  A5.
    • No:  GO to  A3.
  3. A3 CHECK THE MECS COOLANT PUMP RELAY POWER SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect: BJB  Fuse 13 (15A).
    • Disconnect: BJB  Relay 44.
    • Disconnect: BJB  Relay 42.
    • Measure the resistance between the output side of BJB  fuse 13 (15A) and ground.
      Fig 1: Checking Circuit For Short To Ground
      G06275582Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to  A4.
    • No:  REPAIR circuit SBB13 (GY/RD) for a short to ground. CONNECT all components. TEST the system for normal operation.
  4. A4 CHECK THE MECS COOLANT PUMP AND HEATER PUMP POWER SUPPLY CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: MECS  Coolant Pump C1466.
    • Disconnect: Heater Pump Motor C1450.
    • Measure the resistance between BJB  relay 44 pin 5 circuit CE621 (YE/GY), BJB  side and ground.
      Fig 2: Measuring Resistance Between BJB Relay 44 Pin 5 Circuit CE621 (YE/GY) BJB & Ground
      G06275583Courtesy of FORD MOTOR CO.
    • Measure the resistance between BJB  relay 42 pin 5 circuit CHC01 (BN/YE), BJB  side and ground.
      Fig 3: Checking Circuit For Short To Ground
      G06275582Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes:  The condition that caused BJB  fuse 13 (15A) to blow is not present. Inspect the wiring harness for an intermittent condition. Repeat test Steps  A3 and  A4 while wiggling the vehicle wiring harness and visually checking for damage.
    • No:  REPAIR circuit CE621 (YE/GY) or CHC01 (BN/YE) for a short to ground. CONNECT all components. TEST the system for normal operation.
  5. A5 CHECK THE MECS COOLANT PUMP RELAY (BJB RELAY 44) 
    • Carry out the relay component test.

      Refer to the appropriate SYSTEM WIRING DIAGRAMS article for component testing .

    • Is MECS pump relay (BJB relay 44) OK? 
    • Yes:  GO to  A6.
    • No:  INSTALL a new MECS  pump relay (BJB  relay 44). TEST the system for normal operation.
  6. A6 CHECK THE MECS COOLANT PUMP RELAY POWER SUPPLY CIRCUIT FOR AN OPEN 
    • Measure the resistance between BJB  fuse 13 (15A) circuit CE621 (YE/GY), BJB  side and BJB relay 44 pin 5 circuit CE621 (YE/GY), BJB  side.
      Fig 4: Checking Circuit For An Open
      G06275585Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  A7.
    • No:  REPAIR circuit CE621 (YE/GY) for an open. CONNECT all components. TEST the system for normal operation.
  7. A7 CHECK THE MECS COOLANT PUMP POWER SUPPLY CIRCUIT FOR AN OPEN 
    • Measure the resistance between BJB  relay 44 pin 5 circuit CE621 (YE/GY), BJB  side and MECS  coolant pump C1466-2, circuit CE621 (YE/GY).
      Fig 5: Checking Circuit For An Open
      G06275586Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  A8.
    • No:  REPAIR circuit CE621 (YE/GY) for an open. CONNECT all components. TEST the system for normal operation.
  8. A8 CHECK THE MECS COOLANT PUMP GROUND CIRCUIT FOR AN OPEN 
    • Measure the resistance between MECS  coolant pump 1466-1 circuit GD121 (BK/YE) and ground.
      Fig 6: Checking Circuit
      G06275587Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  A9.
    • No:  REPAIR circuit GD121 (BK/YE). CONNECT all components. TEST the system for normal operation.
  9. A9 CHECK BJB FUSE 47 (10A) 
    • Check fuse: BJB  47 (10A).
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  A10.
    • No:  REPAIR circuit CBK03 (GY) for a short to ground. CONNECT all components. TEST the system for normal operation.
  10. A10 CHECK FOR VOLTAGE SUPPLIED TO BJB FUSE 47 (10A) 
    • Disconnect: BJB  Fuse 47 (10A).
    • Ignition ON.
    • Measure the voltage at the supply side of BJB  fuse 47 (10A).
      Fig 7: Checking Circuit For An Open
      G06275588Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  GO to  A11.
    • No:  REPAIR circuit CE612 (GY/VT) for an open. CONNECT all components. TEST the system for normal operation.
  11. A11 CHECK THE MECS COOLANT PUMP RELAY CONTROL POWER SUPPLY CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between the output side of BJB  fuse 47 (10A), circuit CBK03 (GY) and BJB  relay 44 pin 1 circuit CBK03 (GY).
      Fig 8: Checking Circuit For An Open
      G06275589Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  A12.
    • No:  REPAIR circuit CBK03 (GY) for an open. CONNECT all components. TEST the system for normal operation.
  12. A12 CHECK FOR GROUND AT THE MECS COOLANT PUMP RELAY 
    • Connect: BJB  fuse 47 (10A).
    • Ignition ON.
    • Measure the voltage between BJB  relay 44 pins 1 and 2, BJB  side.
      Fig 9: Measuring Voltage Between BJB Relay 44 Pins 1 & 2 BJB Side
      G06275590Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  INSTALL a new MECS  pump. REFER to MOTOR ELECTRONICS PUMP . CONNECT all components. TEST the system for normal operation.
    • No:  GO to  A13.
  13. A13 CHECK THE MECS COOLANT PUMP RELAY CONTROL GROUND CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: PCM  C175T.
    • Measure the resistance between BJB  relay 44 pin 2, BJB  side circuit CE318 (VT) and PCM C175T-49 circuit CE318 (VT).
      Fig 10: Checking Circuit For An Open
      G06275591Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  INSTALL a new PCM. REFER to INSTALLATION . CONNECT all components. TEST the system for normal operation.
    • No:  REPAIR circuit CE318 (VT) for an open. CONNECT all components. TEST the system for normal operation.
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