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Home >> Mercury >> 2004 >> Monterey >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Pinpoint Test KE: Idle Air Control (IAC) Valve Through Pinpoint Test QA: Unable To Activate Self-Test/Network Communication Error/DTC P1001 - CNG, Flex-Fuel & Gasoline >> Pinpoint Test KN: Variable Speed Electric Cooling Fan >> Test Procedure

Test Procedure

  1. KN1 KOEO DTCS P1474 OR P0480: CHECK THE B+ & GND CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Key OFF.
    • CF Motor connector disconnected.
    • Measure the voltage between:
    ( + )CF Motor Connector, Harness Side ( - )CF Motor Connector, Harness Side
    B+ GND

    Is the voltage greater than 10.5 V? 

    Yes No
    GO to  KN3. GO to  KN2.
  2. KN2 CHECK VOLTAGE TO FAN MOTOR USING CHASSIS GROUND AS A REFERENCE 
    • Measure the voltage between:
    ( + )CF Motor Connector, Harness Side ( - )
    B+ Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    REPAIR open circuit
    Open GND harness circuit    		 B+ circuit fault. 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 short to ground before replacing.
  3. KN3 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 KOEO DTCs:

    Are DTCs P0480 or P1474 present? 

    Yes No
    KEY OFF
    GO to  KN4.    		 INSTALL a new CF motor.
  4. KN4 CHECK THE FCV CIRCUIT FOR A SHORT TO POWER IN THE HARNESS 
    • PCM connector disconnected.
    • Key ON Engine OFF.
    • Measure the voltage between:
    ( + )CF Motor Connector, Harness Side ( - )
    FCV Ground

    Is the voltage less than 1 V? 

    Yes No
    KEY OFF
    GO to  KN5.    		 REPAIR short circuit.
  5. KN5 CHECK THE FCV CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Measure the resistance between:
    ( + )CF Motor Connector, Harness Side ( - )
    FCV Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  KN6. REPAIR short circuit.
  6. KN6 CHECK FOR AN OPEN CIRCUIT BETWEEN PCM & FCV 
    • Measure the resistance between:
    ( + )PCM Connector, Harness Side ( - )CF Motor Connector, Harness Side
    FCV FCV

    Is the resistance less than 5 ohms? 

    Yes No
    INSTALL a new PCM.
    Refer to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .    		 REPAIR open circuit.
  7. KN7 CONTINUOUS MEMORY DTCS P1474 OR P0480: CHECK THE B+ & GND CIRCUIT FOR AN INTERMITTENT CONCERN 
    • Key OFF.
    • CF Motor connector disconnected.
    • Connect non-powered test lamp between:
      ( + )CF Motor Connector, Harness Side ( - )CF Motor Connector, Harness Side
      B+ GND
    • Observe the test lamp for an indication of a fault while completing the following. Note that the lamp turns Off when a fault is detected.
      • Shake, wiggle, and bend the B+ and GND circuits to the CF.
      • Shake, wiggle, and bend the associated FUSE.

    Is a fault indicated? 

    Yes No
    ISOLATE the fault and REPAIR as necessary. GO to  KN8.
  8. KN8 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 Ground
    • Key ON Engine OFF.
    • Scan Tool Connected
    • Enter Output Test Mode. Refer to OUTPUT TEST MODE .
    • Command low speed fan ON
    • Observe the DVOM for an indication of a fault while completing the following. Note that Voltage changes suddenly when a fault is detected.
      • Shake, wiggle, and bend the FCV circuit between the CFC and PCM.

    Is a fault indicated? 

    Yes No
    KEY OFF
    ISOLATE the fault and REPAIR as necessary.    		 KEY OFF
    GO to PINPOINT TEST Z step 1 .
  9. KN9 COOLING FAN MOTOR DOES NOT OPERATE (W/ NO DTCS): COMMAND THE FAN ON TO CHECK OPERATION 
    • Run KOEO Self-Test.
      • Listen to FAN.

    Does the fan run sometime during the KOEO self-test? 

    Yes No
    KEY OFF
    Concern is elsewhere. RETURN to SYMPTOM CHARTS - CNG, FLEX-FUEL & GASOLINE for further direction.    		 KEY OFF
    GO to  KN10.
  10. KN10 CHECK THE B+ AND GND TO COOLING FAN MOTOR B+ & GND 
    • CF Motor connector disconnected.
    • Measure the voltage between:
    ( + )CF Motor Connector, Harness Side ( - )CF Motor Connector, Harness Side
    B+ GND

    Is the voltage greater than 10.5 V? 

    Yes No
    INSTALL a new CF motor
    Replacement of the assembly might be required    		 GO to  KN11.
  11. KN11 CHECK VOLTAGE TO COOLING FAN USING CHASSIS GROUND AS A REFERENCE 
    • Measure the voltage between:
    ( + )CF Motor Connector, Harness Side ( - )
    B+ Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    REPAIR open circuit. B+ circuit fault. 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 short to ground before replacing.
  12. KN12 KOEO DTC P0480: CHECK THE B+ AND GND TO COOLING FAN MOTOR 
    • Key OFF.
    • CF Motor connector disconnected.
    • Measure the voltage between:
    ( + )CF Motor Connector, Harness Side ( - )CF Motor Connector, Harness Side
    B+ GND

    Is the voltage greater than 10.5 V? 

    Yes No
    GO to  KN14. GO to  KN13.
  13. KN13 CHECK VOLTAGE TO FAN MOTOR USING CHASSIS GROUND AS A REFERENCE 
    • Measure the voltage between:
    ( + )CF Motor Connector, Harness Side ( - )
    B+ Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    REPAIR open circuit
    Open GND harness circuit    		 B+ circuit fault. 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 short to ground before replacing.
  14. KN14 CHECK THE VPWR VOLTAGE TO CFC 
    • CFC Module connector disconnected.
    • Key ON Engine OFF.
    • Measure the voltage between:
    ( + )CFC Module Connector, Harness Side ( - )
    VPWR - Pin 2 Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    KEY OFF
    GO to  KN15.    		 REPAIR open circuit.
  15. KN15 CHECK THE FCV CIRCUIT(S) TO THE FAN 
    • Connect the 1.6 K ohms resistor between the FCV and B+ circuits at the CF harness connector.
    • (this simulates cooling fan circuitry).
    • Key ON Engine OFF.
    • Run KOEO Self-Test.

    Is DTC P0480 present? 

    Yes No
    GO to  KN16. KEY OFF. INSTALL a new CFC module
    Replacement of the assembly might be required
  16. KN16 CHECK THE FCV CIRCUIT FOR A SHORT TO POWER IN THE HARNESS 
    • PCM connector disconnected.
    • Key ON Engine OFF.
    • Measure the voltage between:
    ( + )CFC Module Connector, Harness Side ( - )
    FCV - Pin 1 Ground

    Is the voltage less than 1 V? 

    Yes No
    GO to  KN17. REPAIR short circuit.
  17. KN17 CHECK THE FCV CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Measure the resistance between:
    ( + )CFC Module Connector, Harness Side ( - )
    FCV - Pin 1 Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  KN18. REPAIR short circuit.
  18. KN18 CHECK THE FCV CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Measure the resistance between:
    ( + )CFC Module Connector, Harness Side ( - )PCM Connector, Harness Side
    FCV - Pin 1 FCV

    Is the resistance less than 5 ohms? 

    Yes No
    INSTALL a new PCM.
    Refer to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .    		 REPAIR open circuit.
  19. KN19 CONTINUOUS MEMORY DTC P0480: CHECK THE B+ & GND FOR AN INTERMITTENT CONCERN 
    • Key OFF.
    • CF Motor connector disconnected.
    • Connect non-powered test lamp between:
      ( + )CF Motor Connector, Harness Side ( - )CF Motor Connector, Harness Side
      B+ GND
    • Observe the test lamp for an indication of a fault while completing the following. Note that the lamp turns Off when a fault is detected.
      • Shake, wiggle, and bend the B+ and GND circuits to the CFM.
      • Lightly tap on the associated FUSE to simulate road shock.

    Is a fault indicated? 

    Yes No
    ISOLATE the fault and REPAIR as necessary. GO to  KN20.
  20. KN20 CHECK THE VPWR CIRCUIT(S) FOR INTERMITTENT CONCERNS 
    • Key OFF.
    • CFC Module connector disconnected.
    • Connect non-powered test lamp between:
      ( + )CFC Module Connector, Harness Side ( - )
      VPWR - Pin 2 Ground
    • Key ON Engine OFF.
    • Observe the test lamp for an indication of a fault while completing the following. Note that the lamp turns Off when a fault is detected.
      • Shake, wiggle, and bend the VPWR circuit(s).

    Is a fault indicated? 

    Yes No
    ISOLATE the fault and REPAIR as necessary. GO to  KN21.
  21. KN21 CHECK THE FCV CIRCUIT(S) FOR INTERMITTENT CONCERNS 
    • Connect the 1.6K ohms resistor between the FCV2 and VPWR circuits at the CFC harness connector.
    • (this simulates cooling fan circuitry).
    • Measure the voltage between:
    ( + )CFC Module Connector, Harness Side ( - )
    FCV - Pin 1 Ground
    • Key ON Engine OFF.
    • Scan Tool Connected
    • Enter Output Test Mode. Refer to OUTPUT TEST MODE .
    • Command low speed fan ON
    • CHECK DVOM for an indication of a fault while completing the following. The voltage changes suddenly when a fault is detected.
    • Shake, wiggle, and bend the FCV circuit between the CFC and PCM.

    Is a fault indicated? 

    Yes No
    KEY OFF
    ISOLATE the fault and REPAIR as necessary.    		 KEY OFF
    GO to PINPOINT TEST Z step 1 .
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