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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1778 (Engine Controls - Pinpoint Test JD: Crankshaft Position (CKP) Sensor Through Pinpoint Test KJ: Supercharger Bypass Control - (Except Diesel & Hybrid)) >> Pinpoint Test JF: Integrated Ignition Coil On Plug Coils A Through J Failure >> Test Procedure

Test Procedure

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  1. JF1 DETERMINE WHICH COIL IS NOT FIRING CORRECTLY 
    NOTE: Electronic ignition engine timing is entirely controlled by the PCM. Electronic ignition timing is NOT adjustable. Do not attempt to check base timing. You will receive false readings.
    NOTE: Pull on the suspect coil connector to determine if it is correctly seated before proceeding with the current diagnostic path. If the suspect coil connector is not seated correctly, reconnect the suspect connector until an audible click can be heard.
    • Determine which coil is not firing correctly using the information from Pinpoint Test JB or a DTC and the table at the beginning of this pinpoint test.
    • Record the suspect cylinder, coil and PCM pin number from the table.

    Is the suspect cylinder number, coil driver and PCM pin number recorded? 

    Yes No
    GO to  JF2. REPEAT the test step to obtain the required information.
  2. JF2 CHECK THE FUNCTIONALITY OF THE SUSPECT COIL DRIVER CIRCUIT 
    • Ignition OFF.
    • Suspect coil connector disconnected.
    • Remove the fuel pump fuse to disable the fuel pump.
    • Connect a non-powered test lamp between the IGN START/RUN and suspect coil driver, harness side.
    • Observe the test lamp while cranking the engine.

    Is the test lamp blinking consistently? 

    Yes No
    GO to  JF3. GO to  JF4.
  3. JF3 CHECK THE FUNCTIONALITY OF THE SUSPECT COIL 
    • Ignition OFF.
    • Carry out a visual inspection. Closely inspect the coil case and boot for carbon tracking, cracks and torn or incorrectly installed boots.
    • Remove the suspect COP from the spark plug.
    • Connect the Air Gap Spark Tester 303-DO37 (D81P-6666-A) or equivalent.
    • Suspect coil connector connected.
    • Crank the engine.
    • Observe the spark tester while cranking the engine.

    Is a bluish-white spark present? 

    Yes No
    GO to PINPOINT TEST Z . INSTALL a new suspect coil. If necessary, INSTALL a new spark plug. REFER to the appropriate Engine Ignition article .
    CLEAR the DTCs. REPEAT the self-test.
  4. JF4 CHECK THE IGNITION START/RUN SUPPLY TO THE SUSPECT COIL 
    • Ignition ON, engine OFF.
    • Suspect coil connector disconnected.
    • Measure the voltage between:
      (+) COP Connector, Harness Side (-) Vehicle Battery
      IGN START/RUN Negative terminal

    Is the voltage greater than 10 V? 

    Yes No
    GO to  JF5. For Crown Victoria,
    Grand Marquis, and
    Town Car, GO to  JF9.
    For all others, REPAIR the open circuit.
    CLEAR the DTCs. REPEAT the self-test.
  5. JF5 CHECK THE SUSPECT COIL DRIVER CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Ignition OFF.
    • PCM connector disconnected.
    • Suspect coil connector disconnected.
    • Measure the resistance between:
      (+) PCM Connector, Harness Side (-) COP Connector, Harness Side
      Suspect coil driver COP

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  JF6. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  6. JF6 CHECK THE SUSPECT COIL DRIVER CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) PCM Connector, Harness Side (-) Vehicle Battery
      Suspect coil driver Negative terminal

    Is the voltage less than 1 V? 

    Yes No
    GO to  JF7. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  7. JF7 CHECK THE SUSPECT COIL DRIVER CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Ignition OFF.
    • Measure the resistance between:
      (+) PCM Connector, Harness Side (-) Vehicle Battery
      Suspect coil driver Negative terminal

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  JF14. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test. If the concern or DTC is still present,
    GO to  JF8.
  8. JF8 CHECK THE SUSPECT COIL FOR DAMAGE 
    • PCM connector connected.
    • Connect the Air Gap Spark Tester 303-D037 (D81P-6666-A) or equivalent to the suspect coil.
    • Crank the engine.
    • Observe the spark tester while cranking the engine.

    Is a bluish-white spark present? 

    Yes No
    If necessary, INSTALL a new spark plug. REFER to the appropriate Engine Ignition article .
    CLEAR the DTCs. REPEAT the self-test.    		 INSTALL a new suspect coil. REFER to the appropriate Engine Ignition article .
    CLEAR the DTCs. REPEAT the self-test.
  9. JF9 CHECK VPWR CIRCUIT CONTINUITY BETWEEN THE SUSPECT COIL AND IGNITION COILS RELAY 
    • Ignition OFF.
    • Ignition Coils Relay connector disconnected.
    • Measure the resistance between:
      (+) Ignition Coils Relay Connector, Harness Side (-) Suspect coil Connector, Harness Side
      VPWR - Pin 3 IGN START/RUN

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  JF10. REPAIR the open circuit. The open is between the splice and the ignition coils relay.
    CLEAR the DTCs. REPEAT the self-test.
  10. JF10 CHECK THE B+ AND IGN START/RUN VOLTAGE TO IGNITION COILS RELAY 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) Ignition Coils Relay Connector, Harness Side (-)
      B+ - Pin 5 Ground
      IGN START/RUN - Pin 2 Ground

    Are the voltages greater than 10 V? 

    Yes No
    GO to  JF11. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  11. JF11 CHECK THE IGNITION COILS RELAY GND CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Measure the voltage between:
      (+) Ignition Coils Relay Connector, Harness Side (-) Ignition Coils Relay Connector, Harness Side
      B+ - Pin 5 GND - Pin 1

    Is the voltage greater than 10 V? 

    Yes No
    GO to  JF12. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  12. JF12 CHECK THE IGNITION COILS RELAY 
    • Carry out the ignition coils relay component test. Refer to the appropriate Component Testing article .

    Is a concern present? 

    Yes No
    INSTALL a new Ignition Coils relay. CLEAR the DTCs. REPEAT the self-test. GO to  JF13.
  13. JF13 TEST DIRECTION FOR PINPOINT TEST A 

    Were you directed to this pinpoint test from pinpoint test step A8? 

    Yes No
    GO to A9 . GO to  JF14.
  14. JF14 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) , 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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