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Test Procedure

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2006 Mercury Mountaineer, 2006 Mercury Monterey, 2006 Mercury Montego, 2006 Mercury Milan, and 2006 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
  1. DR1 CHECK FOR DTCS 

    Are DTCs P0340, P0344, P0345, P0349, or P1336 present? 

    Yes No
    For DTCs P0340, P0344, P0345 or P0349, GO to  DR2.
    For DTC P1336, GO to  DR5.    		 For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
  2. DR2 CONTINUOUS MEMORY DTCS P0340, P0344, P0345 AND P0349: CHECK IF THE ENGINE STARTS 
    • Attempt to start the engine.

    Does the engine start? 

    Yes No
    GO to  DR3. RETURN to SYMPTOM CHARTS for further direction.
  3. DR3 CLEAR AND ATTEMPT TO RETRIEVE THE DTC 
    NOTE: If DTCs P0340, P0344, P0345, or P0349 are present, ignition, alternator noise, RFI and CKP concerns should be considered.
    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.
    • Key ON, engine OFF.
    • Clear the PCM DTCs.
    • Key ON, engine running.
    • Increase engine speed to greater than 1,500 RPM for 10 seconds. Repeat this 3 times.
    • Retrieve the continuous memory DTCs.

    Are DTCs P0340, P0344, P0345 or P0349 present? 

    Yes No
    GO to  DR4. 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.
    • PCM connector connected.
    • CMP Sensor connector connected.
    • Key ON, engine running.
    • Monitor the generator for electrical noise.
    • Key in OFF position.
    • Generator/regulator B+ connector disconnected.
    • Key ON, engine running.
    • With the engine running, determine if the generator is still noisy.

    Does the noise remain constant when the B+ connector is disconnected? 

    Yes No
    For continuous memory DTCs P0340 or P0344, GO to  DR5.
    For continuous memory DTCs P0345 or P0349, GO to  DR13.    		 REFER to the appropriate CHARGING SYSTEM article to diagnose the generator is noisy symptom.
  5. DR5 DETERMINE THE CMP SENSOR PHYSICAL TYPE 
    • Key in OFF position.

    Is the CMP sensor a synchronizer (gear driven) type? 

    Yes No
    GO to  DR6. GO to  DR7.
  6. DR6 VERIFY THE CORRECT INSTALLATION OF THE CMP SENSOR 
    • A CMP sensor identifies the cylinder 1 power stroke. A sensor that is improperly installed/indexed can identify the wrong cylinder as 1, produce a tip-in hesitation and generate DTC P0340.

    Is the CMP sensor installed correctly? 

    Yes No
    GO to  DR7. INSTALL the CMP sensor correctly. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article .
    CLEAR the DTCs. REPEAT the self-test.
  7. DR7 DETERMINE THE CMP SENSOR ELECTRONIC TYPE 
    NOTE: The variable reluctance (VR) sensors have 2-wire connectors, Hall-effect sensors have 3-wire connectors.

    Is the CMP sensor a VR type? 

    Yes No
    GO to  DR8. The CMP sensor is a Hall-effect type.
    GO to  DR19.
  8. DR8 CONTINUOUS MEMORY DTCS P0340 AND P0344: CHECK THE CMP SENSOR RESISTANCE 
    • Key in OFF position.
    • CMP Sensor connector disconnected.
    • Measure the resistance between:
      ( + ) CMP Sensor Connector, Component Side ( - ) CMP Sensor Connector, Component Side
      CMP SIGRTN
    RESISTANCE SPECIFICATION

    Vehicle Low Limit High Limit
    LS 1,850 ohms 2,850 ohms
    F-150, Mark LT 300 ohms 425 ohms
    All others 250 ohms 1,000 ohms

    Is the resistance within specification? 

    Yes No
    GO to  DR9. INSTALL a new CMP sensor. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article .
    CLEAR the DTCs. REPEAT the self-test.
  9. DR9 CHECK THE CMP CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) CMP Sensor Connector, Harness Side ( - ) Vehicle Battery
      CMP Negative terminal

    Is the voltage less than 1 V? 

    Yes No
    GO to  DR10. REPAIR the short circuit. CLEAR the DTCs.
    REPEAT the self-test.
  10. DR10 CHECK THE CMP CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) CMP Sensor Connector, Harness Side
      CMP CMP
      SIGRTN SIGRTN

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  DR11. REPAIR the open circuit. CLEAR the DTCs.
    REPEAT the self-test.
  11. DR11 CHECK FOR A SHORT IN THE HARNESS BETWEEN THE PCM AND THE CMP SENSOR 
    • 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 ( - ) Vehicle Battery
      CMP Negative terminal
      SIGRTN Negative terminal

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to  DR12. REPAIR the short circuit. CLEAR the DTCs.
    REPEAT the self-test.
  12. DR12 CHECK THE CMP SENSOR OUTPUT 
    • Key in OFF position.
    • Generator/regulator B+ connector connected.
    • CMP Sensor connector disconnected.
    • Key ON, engine running.
    • Digital multimeter on low voltage AC scale.
    • Measure the voltage between:
      ( + ) CMP Sensor Connector, Component Side ( - ) CMP Sensor Connector, Component Side
      CMP SIGRTN
    • Run the engine at approximately 2,500 RPM.

    Is the voltage greater than 0.25 V? 

    Yes No
    For Expedition,
    Explorer 4.6L,
    F-150 5.4L,
    Mark LT,
    Mountaineer 4.6L,
    Mustang 4.6L, and
    Navigator, GO to  DR25.
    For all others, GO to  DR26.    		 INSTALL a new CMP sensor. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article .
    CLEAR the DTCs. REPEAT the self-test.
  13. DR13 CONTINUOUS MEMORY DTCS P0345 AND P0349: CHECK THE CMP2 SENSOR RESISTANCE 
    • Key in OFF position.
    • CMP2 Sensor connector disconnected.
    • Measure the resistance between:
      ( + ) CMP2 Sensor Connector, Component Side ( - ) CMP2 Sensor Connector, Component Side
      CMP2 SIGRTN
    RESISTANCE SPECIFICATION

    Vehicle Low Limit High Limit
    LS 1,850 ohms 2,850 ohms
    F-150, Mark LT 300 ohms 425 ohms
    All others 250 ohms 1,000 ohms

    Is the resistance value(s) within specifications? 

    Yes No
    GO to  DR14. INSTALL a new CMP2 sensor. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article .
    CLEAR the DTCs. REPEAT the self-test.
  14. DR14 CHECK THE CMP2 CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) CMP2 Sensor Connector, Harness Side ( - ) Vehicle Battery
      CMP2 Negative terminal

    Is the voltage less than 1 V? 

    Yes No
    GO to  DR15. REPAIR the short circuit. CLEAR the DTCs.
    REPEAT the self-test.
  15. DR15 CHECK THE CMP2 CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) CMP2 Sensor Connector, Harness Side
      CMP2 CMP2
      SIGRTN SIGRTN

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  DR16. REPAIR the open circuit. CLEAR the DTCs.
    REPEAT the self-test.
  16. DR16 CHECK FOR A SHORT IN THE HARNESS BETWEEN THE PCM AND THE CMP2 SENSOR 
    • Measure the resistance between:
      ( + ) CMP2 Sensor Connector, Harness Side ( - ) CMP2 Sensor Connector, Harness Side
      CMP2 SIGRTN
    • Measure the resistance between:
      ( + ) CMP2 Sensor Connector, Harness Side ( - ) Vehicle Battery
      CMP2 Negative terminal
      SIGRTN Negative terminal

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to  DR17. REPAIR the short circuit. CLEAR the DTCs.
    REPEAT the self-test.
  17. DR17 CHECK FOR A SHORT BETWEEN THE CMP AND THE CMP2 CIRCUITS 
    • CMP Sensor connector disconnected.
    • CMP2 Sensor connector disconnected.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) PCM Connector, Harness Side
      CMP CMP2

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  DR18. REPAIR the short circuit. CLEAR the DTCs.
    REPEAT the self-test.
  18. DR18 CHECK THE CMP2 SENSOR OUTPUT 
    • Key in OFF position.
    • Generator/regulator B+ connector connected.
    • CMP2 Sensor connector disconnected.
    • Key ON, engine running.
    • Digital multimeter on low voltage AC scale.
    • Measure the voltage between:
      ( + ) CMP2 Sensor Connector, Component Side ( - ) CMP2 Sensor Connector, Component Side
      CMP2 SIGRTN
    • Run the engine at approximately 2,500 RPM.

    Is the voltage greater than 0.25 V? 

    Yes No
    For Expedition,
    Explorer 4.6L,
    F-150 5.4L,
    Mark LT,
    Mountaineer 4.6L,
    Mustang 4.6L, and
    Navigator, GO to  DR25.
    For all others, GO to  DR26.    		 INSTALL a new CMP2 sensor. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article .
    CLEAR the DTCs. REPEAT the self-test.
  19. DR19 CONTINUOUS MEMORY DTCS P0340 AND P0344: CHECK THE VPWR VOLTAGE TO CMP SENSOR 
    • CMP Sensor connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) CMP Sensor Connector, Harness Side ( - ) Vehicle Battery
      VPWR Negative terminal

    Is the voltage greater than 10 V? 

    Yes No
    GO to  DR20. REPAIR the open circuit. CLEAR the DTCs.
    REPEAT the self-test.
  20. DR20 CHECK THE PWRGND VOLTAGE TO CMP SENSOR 
    • Key in OFF position.
    • Measure the voltage between:
      ( + ) Vehicle Battery ( - ) CMP Sensor Connector, Harness Side
      Positive terminal PWRGND

    Is the voltage greater than 10 V? 

    Yes No
    GO to  DR21. REPAIR the open circuit. CLEAR the DTCs.
    REPEAT the self-test.
  21. DR21 CHECK THE CMP CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) CMP Sensor Connector, Harness Side ( - ) Vehicle Battery
      CMP Negative terminal

    Is the voltage less than 1 V? 

    Yes No
    GO to  DR22. REPAIR the short circuit. CLEAR the DTCs.
    REPEAT the self-test.
  22. DR22 CHECK FOR AN OPEN CIRCUIT BETWEEN THE PCM AND CMP SENSOR 
    • Key in OFF position.
    • CMP Sensor connector disconnected.
    • Measure the resistance between:
      ( + ) CMP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
      CMP CMP

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  DR23. REPAIR the open circuit. CLEAR the DTCs.
    REPEAT the self-test.
  23. DR23 CHECK THE CMP SENSOR CIRCUIT FOR A SHORT TO GND IN THE HARNESS 
    NOTE: The measurement may be taken at the PCM or CMP connector, whichever is easier to access.
    • Measure the resistance between:
      ( + ) CMP Sensor Connector, Harness Side ( - ) CMP Sensor Connector, Harness Side
      CMP PWRGND

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  DR24. REPAIR the short circuit. CLEAR the DTCs.
    REPEAT the self-test.
  24. DR24 CHECK THE CMP SENSOR OUTPUT DURING CRANK MODE 
    • CMP Sensor connector connected.
    • Digital multimeter on low voltage DC scale.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - ) PCM Connector, Harness Side
      CMP PWRGND
    • Crank the engine for at least 10 revolutions.

    Does the voltage switch between LOW (less than 2 volts DC) and HIGH (greater than 8 volts DC)? 

    Yes No
    GO to  DR26. INSTALL a new CMP sensor. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article .
    CLEAR the DTCs. REPEAT the self-test.
  25. DR25 CHECK THE VARIABLE CAMSHAFT TIMING (VCT) SYSTEM 
    NOTE: Only diagnose the bank indicated by the DTC.
    • Check the VCT system for correct operation.

    Is a concern present? 

    Yes No
    REPAIR as necessary.
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  DR26.
  26. DR26 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) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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