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Test Procedure

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  1. DR1 CHECK FOR DTCS 

    Are DTCs P0340, P0341, P0344, P0345, P0346, P0349, P0365, P0366, P0369, P0390, P0391, or P0394 present? 

    Yes No
    For vehicles with DTCs and a no crank or no start symptom, GO to  DR5.
    For all others, GO to  DR2.    		 For symptoms without DTCs, GO to  DR2.
    For all others, RETURN to SYMPTOM CHARTS for further direction.
  2. DR2 INSPECT THE HARNESS 
    • Ignition OFF.
    • Check the harness for routing, alterations, incorrect shielding, or electrical interference from other systems.
    • Check the CMP connector for damage or corrosion.

    Is a concern present? 

    Yes No
    REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to  DR3.
  3. DR3 CLEAR AND ATTEMPT TO RETRIEVE THE DTC 
    NOTE: Consider the ignition system, alternator noise, radio frequency interference and crankshaft position (CKP) sensor concerns if DTCs P0340, P0341, P0344, P0345, P0346, P0349, P0365, P0366, P0369, P0390, P0391, or P0394 are present.
    NOTE: For vehicles with variable camshaft timing (VCT), concerns with the engine oil level, oil filter, oil contamination, or the VCT system may cause camshaft positioning errors.
    • Ignition ON, engine OFF.
    • Clear the PCM DTCs.
    • Ignition ON, engine running.
    • Increase engine speed to greater than 1, 500 RPM for 10 seconds. Repeat this 3 times.
    • Carry out the PCM self-test.

    Are DTCs P0340, P0341, P0344, P0345, P0346, P0349, P0365, P0366, P0369, P0390, P0391 or P0394 present? 

    Yes No
    GO to  DR4. For symptoms without DTCs, RETURN to SYMPTOM CHARTS for further direction.
    For all others, GO to PINPOINT TEST Z .
  4. DR4 CHECK THE GENERATOR FOR EXCESSIVE ELECTRICAL NOISE 
    NOTE: If the generator/regulator is electrically noisy, the noise decreases when the B+ connector is disconnected.
    • Ignition ON, engine running.
    • Monitor the generator for an audible electric noise.
    • Ignition OFF.
    • Generator/regulator B+ connector disconnected.
    • Ignition ON, engine running.
    • With the engine running, determine if the generator noise remains steady, decreases or increases in volume.

    Does the generator noise remain steady when the B+ connector is disconnected? 

    Yes No
    GO to  DR5. REFER to the Charging System article, to DIAGNOSE the generator is noisy symptom.
  5. DR5 CHECK THE VOLTAGE TO THE CMP SENSOR 
    NOTE: Diagnose the suspect CMP sensor indicated by the DTC. For 2 pin VR type CMP sensor DTCs, GO to  DR6.
    • Ignition OFF.
    • Generator/regulator B+ connector connected.
    • CMP Sensor connector disconnected.
    • Ignition ON, engine OFF.
    • For the VBPWR CMP sensors,
    • Measure the voltage between:
      (+) CMP Sensor Connector, Harness Side (-)
      VBPWR Ground
    • For the VREF CMP sensors,
    • Measure the voltage between:
      (+) CMP Sensor Connector, Harness Side (-) CMP Sensor Connector, Harness Side
      VREF SIGRTN

    Is the voltage greater than 10.5 V on the VBPWR circuit or is the voltage between 4.5 and 5.5 V on the VREF circuit? 

    Yes No
    GO to  DR7. For Aviator,
    Continental 2.0L,
    Corsair,
    EcoSport,
    Edge,
    Escape/Kuga,
    Expedition,
    Explorer,
    F-150,
    F-Series Super Duty,
    Fusion 1.5L,
    Fusion 2.0L,
    KA,
    MKZ 2.0L,
    Motorhome/Stripped Chassis/Step Van,
    Mustang,
    Nautilus,
    Navigator,
    Ranger,
    Transit 3.5L TiVCT,
    Transit Connect 1.0L, and
    Transit Connect 2.0L, GO to PINPOINT TEST C .
    For all others, REPAIR the open circuit.
    Clear the PCM DTCs. REPEAT the self-test.
  6. DR6 CHECK THE CMP SENSOR RESISTANCE 
    NOTE: Diagnose the suspect CMP sensor indicated by the DTC.
    • Ignition OFF.
    • CMP Sensor connector disconnected.
    • Measure the resistance between:
      (+) CMP Sensor Connector, Component Side (-) CMP Sensor Connector, Component Side
      CMP SIGRTN

    Is the resistance between 250 to 2000 ohms? 

    Yes No
    GO to  DR7. INSTALL a new CMP sensor. REFER to the Electronic Engine Controls article.
    Clear the PCM DTCs. REPEAT the self-test.
  7. DR7 CHECK THE CMP SENSOR CIRCUITS FOR AN OPEN 
    • PCM connector disconnected.
    • Measure the resistance between:
      (+) CMP Sensor Connector, Harness Side (-) PCM Connector, Harness Side
      CMP CMP
      SIGRTN SIGRTN

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  DR8. REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  8. DR8 CHECK THE CMP CIRCUIT FOR A SHORT 
    • Measure the resistance between:
      (+) CMP Sensor Connector, Harness Side (-) CMP Sensor Connector, Harness Side
      CMP SIGRTN
    • Measure the resistance between:
      (+) CMP Sensor Connector, Harness Side (-)
      CMP Ground

      Are the resistances greater than 10K ohms? 

      Yes No
      GO to  DR9. REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.
    • DR9 CHECK THE CMP CIRCUIT FOR A SHORT TO VOLTAGE 
      • Ignition ON, engine OFF.
      • Measure the voltage between:
      (+) CMP Sensor Connector, Harness Side (-)
      CMP Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. GO to  DR10.
  9. DR10 CHECK THE CMP SENSOR OPERATION 
    • Ignition OFF.
    • CMP Sensor connector connected.
    • PCM connector connected.
    • Ignition ON, engine running.
    • Access the PCM and monitor the SYNC (MODE) PID.

    Does the engine start and does the SYNC PID read YES? 

    Yes No
    GO to  DR11. INSTALL a new CMP sensor. REFER to the Electronic Engine Controls article.
    Clear the PCM DTCs. REPEAT the self-test.
  10. DR11 CHECK FOR DTCS 
    • Carry out the PCM self-test.

    Are any DTCs present? 

    Yes No
    INSTALL a new CMP sensor. REFER to the Electronic Engine Controls article.
    Clear the PCM DTCs. REPEAT the self-test.    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
    Clear the PCM DTCs. REPEAT the self-test.
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