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Test Procedure

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
  1. KN1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) 
    • Is DTC P0480 or P0483 present? 
    Yes No
    For KOEO and KOER DTC P0480, GO to  KN2.
    For continuous memory DTC P0480, GO to  KN9.
    For continuous memory DTC P0483, GO to  KN15.    		 For electric cooling fan(s) does not operate (low, medium, high or variable speed), GO to  KN11.
  2. KN2 KOEO AND KOER DTC P0480: CHECK THE B+ AND GND CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Key in OFF position.
    • CF Module connector disconnected.
    • Rotate the fan by hand. The fan should rotate freely, with no abnormal binding. If binding is present, remove any foreign materials or install a new fan assembly as required.
    • Measure the voltage between:
      ( + ) CF Module Connector, Harness Side ( - ) CF Module Connector, Harness Side
      B+ - Pin 1 GND - Pin 2
    • Is the voltage greater than 10 V? 
    Yes No
    GO to  KN4. GO to  KN3.
  3. KN3 CHECK THE VOLTAGE TO THE COOLING FAN MODULE USING GROUND AS A REFERENCE 
    • Measure the voltage between:
      ( + ) CF Module Connector, Harness Side ( - )
      B+ - Pin 1 Ground
    • Is the voltage greater than 10 V? 
    Yes No
    REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test. A B+ circuit concern is present. CHECK the condition of the related fuse/fuse links. If OK, REPAIR the open circuit. If the fuse/fuse link is damaged, CHECK the circuit for a short to ground before installing a new fuse/fuse link.
  4. KN4 CHECK THE FCV CIRCUIT(S) 
    • Connect the 1.6K ohms resistor between the FCV and B+ circuits at the CF module harness connector (this simulates cooling fan circuitry).
    • Key ON, engine OFF.
    • Carry out the KOEO self-test.
    • Is DTC P0480 present? 
    Yes No
    GO to  KN6. For Crown Victoria,
    Grand Marquis, and
    Town Car, GO to  KN5.
    For all others, INSTALL a new CF module. REFER to the ENGINE COOLING article
    CLEAR the DTCs. REPEAT the self-test.
  5. KN5 CHECK THE COOLING FAN OPERATION 
    • CF Motor connector disconnected.
    • Connect a 5 amp fused jumper wire between the following:
      Point A 12 Volt Vehicle Battery Point B CF Motor Connector, Component Side
      Positive terminal VPWR - Pin 2
    • Connect a 5 amp fused jumper wire between the following:
      Point A Vehicle Battery Point B CF Motor Connector, Component Side
      Negative terminal GND - Pin 1
    • Does the cooling fan motor operate correctly? 
    Yes No
    INSTALL a new CF module. REFER to the ENGINE COOLING article INSTALL a new Cooling Fan. REFER to the ENGINE COOLING article
  6. KN6 CHECK THE FCV CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Key in OFF position.
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) CF Module Connector, Harness Side ( - )
      FCV - Pin 4 Ground
    • Is the voltage less than 1 V? 
    Yes No
    GO to  KN7. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  7. KN7 CHECK THE FCV CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) CF Module Connector, Harness Side ( - )
      FCV - Pin 4 Ground
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  KN8. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  8. KN8 CHECK FOR AN OPEN CIRCUIT BETWEEN THE PCM AND COOLING FAN MODULE 
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) CF Module Connector, Harness Side
      FCV FCV - Pin 4
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  KN16. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  9. KN9 CONTINUOUS MEMORY DTC P0480: CHECK THE B+ AND GND CIRCUIT FOR AN INTERMITTENT CONCERN 
    • Key in OFF position.
    • CF Module connector disconnected.
    • Rotate the fan by hand. The fan should rotate freely, with no abnormal binding. If binding is present, remove any foreign materials or install a new fan assembly as required.
    • Connect a non-powered test lamp between:
      ( + ) CF Module Connector, Harness Side ( - ) CF Module Connector, Harness Side
      B+ - Pin 1 GND - Pin 2
    • Observe the test lamp for an indication of a concern while carrying out the following. Note that the lamp turns off when a concern is present.
      • Shake, wiggle, and bend the B+ and GND circuits to the CF
      • Shake, wiggle, and bend the associated fuse
    • Is a concern present? 
    Yes No
    ISOLATE the concern and REPAIR as necessary.
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  KN10.
  10. KN10 CHECK THE FCV CIRCUIT(S) FOR INTERMITTENT CONCERNS 
    • Connect the 1.6 K ohms resistor between the FCV and B+ circuits at the CF harness connector (this simulates cooling fan circuitry).
    • Measure the voltage between:
      ( + ) CF Module Connector, Harness Side ( - )
      FCV - Pin 4 Ground
    • Key ON, engine OFF.
    • Enter output test mode. Refer toOUTPUT TEST MODE (OTM) .
    • Command the low speed fan ON.
    • Observe the digital multimeter (DMM) for an indication of a concern while shaking, wiggling, and bending the FCV circuit between the CF module and the PCM. Note that voltage changes suddenly when a concern is detected.
    • Command the outputs OFF.
    • Exit output test mode.
    • Is a concern present? 
    Yes No
    ISOLATE the concern and REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. refer to PINPOINT TEST Z .
  11. KN11 COOLING FAN MOTOR DOES NOT OPERATE (WITH NO DTCS): COMMAND THE FAN ON TO CHECK OPERATION 
    • Carry out the KOEO self-test.
    • Listen to the fan.
    • Does the fan operate sometime during the KOEO self-test? 
    Yes No
    The concern is elsewhere. RETURN toNO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for further direction. GO to  KN12.
  12. KN12 CHECK THE B+ AND GND CIRCUITS TO THE COOLING FAN MODULE 
    • Key in OFF position.
    • CF Module connector disconnected.
    • Rotate the fan by hand. The fan should rotate freely, with no abnormal binding. If binding is present, remove any foreign materials or install a new fan assembly as required.
    • Measure the voltage between:
      ( + ) CF Module Connector, Harness Side ( - ) CF Module Connector, Harness Side
      B+ - Pin 1 GND - Pin 2
    • Is the voltage greater than 10 V? 
    Yes No
    For Crown Victoria,
    Grand Marquis, and
    Town Car, GO to  KN13.
    For all others, INSTALL a new CF module. REFER to the ENGINE COOLING article
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  KN14.
  13. KN13 CHECK THE COOLING FAN OPERATION 
    • CF Motor connector disconnected.
    • Connect a 5 amp fused jumper wire between the following:
      Point A 12 Volt Vehicle Battery Point B CF Motor Connector, Component Side
      Positive terminal VPWR - Pin 2
    • Connect a 5 amp fused jumper wire between the following:
      Point A Vehicle Battery Point B CF Motor Connector, Component Side
      Negative terminal GND - Pin 1
    • Does the cooling fan motor operate correctly? 
    Yes No
    INSTALL a new CF module. REFER to the ENGINE COOLING article INSTALL a new Cooling Fan. REFER to the ENGINE COOLING article
  14. KN14 CHECK THE VOLTAGE TO THE COOLING FAN MODULE USING GROUND AS A REFERENCE 
    • Measure the voltage between:
      ( + ) CF Module Connector, Harness Side ( - )
      B+ - Pin 1 Ground
    • Is the voltage greater than 10 V? 
    Yes No
    REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test. A B+ circuit concern is present. CHECK the condition of the related fuse/fuse links. If OK, REPAIR the open circuit. If the fuse/fuse link is damaged, CHECK the circuit for a short to ground before installing a new fuse/fuse link.
    CLEAR the DTCs. REPEAT the self-test.
  15. KN15 CONTINUOUS MEMORY DTC P0483: CHECK FOR A COOLING FAN MOTOR OBSTRUCTION OR A COOLING FAN MOTOR MECHANICAL FAILURE 
    • Is a cooling fan motor obstruction or a cooling fan motor mechanical failure present? 
    Yes No
    REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. CLEAR the DTCs. REPEAT the self-test.
  16. KN16 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.
    • Is the concern still present? 
    Yes No
    INSTALL a new PCM. REFER toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Programming the VID Block for a Replacement PCM. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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