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Home >> Mercury >> 2008 >> Sable Base, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 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 JE: Integrated Ignition Coil Pack A, B, or C Failure >> Test Procedure

Test Procedure

  1. JE1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) 
    • Are DTCs P0350, P0351, P0352, or P0353 present? 
    Yes No
    GO to  JE2. For all other DTCs, GO toDIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
  2. JE2 DETERMINE WHICH COIL IS NOT FIRING PROPERLY 
    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.
    • Determine which coil is not firing properly 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  JE3. To obtain the required information, REPEAT step JE2.
  3. JE3 DTC P0351, P0352, P0353: CHECK IGN START/RUN VOLTAGE TO THE COIL PACK 
    • Suspect coil connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) Coil Pack Assembly Connector, Harness Side ( - )
      IGN START/RUN Ground
    • Is the voltage greater than 10 V? 
    Yes No
    GO to  JE4. The IGN START/RUN has a circuit concern. CHECK the condition of the related fuses/fuse links. If OK, REPAIR the open circuit. If the fuse/fuse link is damaged, CHECK the IGN START/RUN circuit for a short to ground. REPAIR as necessary. CARRY OUT the misfire monitor drive cycle. REFER toON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
    CLEAR the DTCs. REPEAT the self-test.
  4. JE4 CHECK THE FUNCTIONALITY OF THE SUSPECT COIL DRIVER (CD) CIRCUIT 
    • Key in OFF position.
    • Connect a test lamp between IGN START/RUN and the suspect CD circuit (determined from the table) at the coil pack harness connector.
    • Crank the engine while the accelerator pedal is fully applied.
    • Observe the test lamp while cranking the engine.
    • Does the test lamp blink consistently? 
    Yes No
    GO to  JE8. GO to  JE5.
  5. JE5 CHECK THE SUSPECT CD CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Key in OFF position.
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) Coil Pack Assembly Connector, Harness Side ( - ) PCM Connector, Harness Side
      Suspect coil driver Suspect coil driver
    • Is the resistance less than 5 ohms? 
    Yes No
    GO to  JE6. REPAIR the open circuit. CARRY out the misfire monitor drive cycle. REFER toON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
    CLEAR the DTCs. REPEAT the self-test.
  6. JE6 CHECK THE SUSPECT CD CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - )
      Suspect coil driver Ground
    • Is any voltage present? 
    Yes No
    REPAIR the short circuit. CARRY out the misfire monitor drive cycle. REFER toON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  JE7.
  7. JE7 CHECK THE SUSPECT CD CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - )
      Suspect coil driver Ground
    • Is the resistance greater than 10K ohms? 
    Yes No
    GO to  JE9. REPAIR the short circuit. CARRY out the misfire monitor drive cycle. REFER toON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
    CLEAR the DTCs. REPEAT the self-test.
  8. JE8 CHECK THE SUSPECT COIL FOR DAMAGE 
    • Key in OFF position.
    • Remove the spark plug wire from the suspect coil tower (as determined from the table).
    • Connect the Air Gap Spark Tester 303-D037 (D81P-6666-A) or equivalent to the suspect spark plug wire.
    • Crank the engine while the accelerator pedal is fully applied.
    • Observe the spark tester while cranking the engine.
    • Is a bluish-white spark present? 
    Yes No
    refer to PINPOINT TEST Z . INSTALL a new coil pack as needed. REFER to the ENGINE IGNITION - CARRY out the misfire monitor drive cycle article. Refer to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
    CLEAR the DTCs. REPEAT the self-test.
  9. JE9 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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