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HOMESERVICE MANUALSFORD2005TAURUS SEL, 4D SEDANREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - PINPOINT TEST HG: POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM THROUGH PINPOINT TEST JD: CRANKSHAFT POSITION (CKP) SENSOR - (EXCEPT DIESEL & HYBRID)PINPOINT TEST JB: SECONDARY IGNITION (COP)TEST PROCEDURE
2005 Ford Taurus SEL, 4D Sedan

Test Procedure

2005 Ford Taurus SEL, 4D SedanSECTION Test Procedure
NOTE: Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION  table of fault code setting condition.
FAULT CODE SETTING CONDITION

Fault Code Setting Condition Testing
P0350 KOER  JB1
P0350 Continuous Memory  JB1
  1. JB1 VISUAL INSPECTION OF IGNITION SYSTEM 
    • Visually inspect the engine compartment to make sure all coils are properly and securely connected.
    • Examine all the wiring harnesses and connectors for damaged, burned, or overheated insulation, and loose or broken conditions.
    • Make sure the vehicle battery is in good condition and all of the accessories are turned off.

    Is a concern present? 

    Yes No
    REPAIR as necessary. GO to  JB2.
  2. JB2 DTC P0301 THROUGH P0310: MISFIRE ON CYLINDERS 1 THROUGH 10 

    Are any of the above listed DTCs present? 

    Yes No
    GO to  JB3. GO to  JB4.
  3. JB3 CHECK FOR SPARK AT CYLINDER(S) INDICATED BY THE DTC(S) 
    • Locate and activate the fuel inertia switch to disable the fuel pump.
    • Disconnect the ignition coil(s) from the spark plug(s).
    • Connect the air gap spark tester 303-D037 (D81P-6666-A) or its equivalent to the suspect coil.
    • If a WDS or equivalent diagnostic tool is available, use the scope function to verify that the coil is the problem.
    • Observe the spark tester while cranking the engine.

    Is a bluish-white spark present? 

    Yes No
    Key in OFF position.
    GO to  JB5.    		 Key in OFF position.
    INSPECT the coil boot(s) for the missing cylinder(s). INSTALL a new coil boot(s) if necessary. INSPECT the spark plug(s) for the missing cylinder(s). MEASURE the resistance of the spark plug(s). INSTALL a new spark plug(s) if the resistance is lower than 2K ohms or higher than 20K ohms.
    GO to  JB4.
  4. JB4 CHECK FOR SPARK AT ALL CYLINDERS 
    • Locate and activate the fuel inertia switch to disable fuel pump.
    • Disconnect the ignition coil(s) from the spark plug(s).
    • Connect the air gap spark tester 303-D037 (D81P-6666-A) or its equivalent to the suspect coil.
    • Observe the spark tester at each cylinder while cranking the engine.

    Is a bluish-white spark consistent between all cylinders? 

    Yes No
    Key in OFF position.
    GO to  JB5.    		 Key in OFF position.
    INSPECT the coil boot(s) for the missing cylinder(s). INSTALL a new coil boot(s) if necessary. INSPECT the spark plug(s) for the missing cylinder(s). MEASURE the resistance of the spark plug(s). INSTALL a new spark plug(s) if the resistance is lower than 2K ohms or higher than 20K ohms.
    RECORD the cylinder(s) with inconsistent spark.
    GO to  JB7.
  5. JB5 CHECK THE SPARK PLUGS 
    • Remove and inspect the plugs for damage, wear, carbon deposits, and proper plug gap.

    Are the plugs OK? 

    Yes No
    GO to  JB6. REPAIR the plug(s). ADJUST the gap or INSTALL a new spark plug(s) as necessary.
  6. JB6 CHECK SPARK PLUG RESISTANCE 
    • Measure the spark plug resistance.

    Is the resistance between 2, 000 and 20, 000 ohms? 

    Yes No
    GO to  JB7. INSTALL a new spark plug.
  7. JB7 TEST DIRECTION FOR SYMPTOM CHARTS 

    Were you directed to this pinpoint test from  SYMPTOM CHARTS - GASOLINE MODELS  ? 

    Yes No
    Concern is elsewhere. RETURN to SYMPTOM CHARTS for further direction. GO to  JB8.
  8. JB8 TEST DIRECTION FOR PINPOINT TEST HD 

    Were you directed to this pinpoint test from pinpoint test step HD4? 

    Yes No
    GO to PINPOINT TEST HD STEP 6 . GO to  JB9.
  9. JB9 TEST DIRECTION FOR PINPOINT TEST A 

    Were you directed to this pinpoint test from pinpoint test step A9? 

    Yes No
    GO to PINPOINT TEST A STEP 10 . Intermittent:
    GO to PINPOINT TEST Z STEP 1 .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.