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Home >> Mercury >> 2009 >> Sable Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1878 (Engine Controls - Pinpoint Test JE: Integrated Ignition Coil Pack A, B, Or C Failure Through Pinpoint Test Kn: Variable Speed Electric Cooling Fan - (Except Diesel & Hybrid)) >> PINPOINT TEST KN: Variable Speed Electric Cooling Fan >> Test Procedure

Test Procedure

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  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  KN8.
    For continuous memory DTC P0483, GO to  KN13.    		 For electric cooling fan(s) does not operate (low, medium, high or variable speed), GO to  KN10.
  2. KN2 KOEO AND KOER DTC P0480: CHECK THE B+ AND GND CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Key in OFF position.
    • CF Motor 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 Motor Connector, Harness Side ( - ) CF Motor 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 FAN MOTOR USING GROUND AS A REFERENCE 
    • Measure the voltage between:
      ( + ) CF Motor 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 harness connector (this simulates cooling fan circuitry).
    • Key ON, engine OFF.
    • Check for KOEO DTCs.
    • Is DTC P0480 present? 
    Yes No
    GO to  KN5. INSTALL a new cooling fan motor. REFER to the appropriate ENGINE COOLING article.
    CLEAR the DTCs. REPEAT the self-test.
  5. KN5 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 Motor Connector, Harness Side ( - )
      FCV - Pin 4 Ground
    • Is the voltage less than 1 V? 
    Yes No
    GO to  KN6. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  6. KN6 CHECK THE FCV CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) CF Motor Connector, Harness Side ( - )
      FCV - Pin 4 Ground
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  KN7. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  7. KN7 CHECK FOR AN OPEN CIRCUIT BETWEEN THE PCM AND FAN MOTOR 
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) CF Motor Connector, Harness Side
      FCV FCV - Pin 4
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  KN14. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  8. KN8 CONTINUOUS MEMORY DTC P0480: CHECK THE B+ AND GND CIRCUIT FOR AN INTERMITTENT CONCERN 
    • Key in OFF position.
    • CF Motor 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 Motor Connector, Harness Side ( - ) CF Motor 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  KN9.
  9. KN9 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 Motor Connector, Harness Side ( - )
      FCV - Pin 4 Ground
    • Key ON, engine OFF.
    • Enter output test mode. Refer to OUTPUT 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 motor and the PCM. Note that voltage changes suddenly when a concern is detected.
    • 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 .
  10. KN10 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 toSTEP 2: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for further direction. GO to  KN11.
  11. KN11 CHECK THE B+ AND GND CIRCUITS TO THE COOLING FAN MOTOR 
    • Key in OFF position.
    • CF Motor 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 Motor Connector, Harness Side ( - ) CF Motor Connector, Harness Side
      B+ - Pin 1 GND - Pin 2
    • Is the voltage greater than 10 V? 
    Yes No
    INSTALL a new cooling fan motor. REFER to the appropriate ENGINE COOLING article.
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  KN12.
  12. KN12 CHECK THE VOLTAGE TO THE COOLING FAN USING GROUND AS A REFERENCE 
    • Measure the voltage between:
      ( + ) CF Motor 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.
  13. KN13 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.
  14. KN14 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 to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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