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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - EEC-V - CNG, Flex-Fuel & Gasoline >> System Tests >> Test JD: Crankshaft Position (CKP) Sensor >> Diagnostic Aids

Diagnostic Aids

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:

Fig 1: Identifying CKP Sensor Circuits & Connector Terminals (Contour, Cougar & Mystique 2.5L)
G99D02623Courtesy of FORD MOTOR CO.
Fig 2: Identifying CKP Sensor Circuits & Connector Terminals (Contour, Cougar & Mystique 2.0L, & Escort 2.0L 4V)
G99F02624Courtesy of FORD MOTOR CO.
Fig 3: Identifying CKP Sensor Circuits & Connector Terminals (Escort 2.0L 2V & Explorer 4.0L SOHC)
G99I02625Courtesy of FORD MOTOR CO.
Fig 4: Identifying CKP Sensor Circuits & Connector Terminals (Focus 2.0L 2V)
G00013292Courtesy of FORD MOTOR CO.
Fig 5: Identifying CKP Sensor Circuits & Connector Terminals (Focus 2.0L 4V)
G00013293Courtesy of FORD MOTOR CO.
Fig 6: Identifying CKP Sensor Circuits & Connector Terminals (LS)
G00013294Courtesy of FORD MOTOR CO.
Fig 7: Identifying CKP Sensor Circuits & Connector Terminals (All Other Models)
G99A02626Courtesy of FORD MOTOR CO

  1. 1) Check CKP(+) & CKP(-) Circuit For Continuity

    Turn ignition switch to OFF position. Disconnect CKP sensor and PCM connector(s). Inspect connectors for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM, measure resistance of CKP(+) and CKP(-) circuits between PCM harness connector and CKP sensor harness connector. See Fig 1-Fig 7 . If both resistance measurements are 5 ohms or less, go to next step. If either resistance measurement is more than 5 ohms, repair open in affected circuit. See WIRING DIAGRAMS article.

  2. 2) Check For CKP(+) Voltage Fault

    Reconnect PCM connector. Turn ignition switch to ON position. Measure voltage between CKP(+) terminal at CKP sensor harness connector and negative battery terminal. If voltage is more than one volt, but less than 2 volts, go to next step. If voltage is not as specified, check for bias fault. Go to step  19).

  3. 3) Check For CKP(-) Voltage Fault

    Ensure ignition switch is in ON position. Measure voltage between CKP(-) terminal at CKP sensor harness connector and negative battery terminal. If voltage is 1-2 volts, go to step  10). If voltage is not 1-2 volts, check for bias fault. Go to next step.

  4. 4) Determine If Fault Is Bias High Or Bias Low

    If voltage measurement in step  3) is less than one volt, fault is bias low. Go to next step. If voltage measurement in step  3) is 2 volts or more, fault is bias high. Go to step  6).

  5. 5) Check CKP(-) Circuit For Short To Ground In Harness

    Turn ignition switch to OFF position. Disconnect PCM connector(s). Measure resistance between PCM connector CKP(-) terminal and negative battery terminal. See Fig 1-Fig 7 . If resistance is more than 10 k/ohms, replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Program PCM. See FLASH VEHICLE IDENTIFICATION BLOCK PROCEDURE . If resistance is 10 k/ohms or less, repair short to ground in CKP(-) circuit.

  6. 6) Check CKP(-) Sensor For Short To Power

    Disconnect PCM connector(s). Turn ignition switch to ON position. Measure voltage between PCM connector CKP(-) terminal and negative battery terminal. If voltage is .5 volt or more, repair short to power in CKP(-) circuit. If resistance is less than .5 volt, replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Program PCM. See FLASH VEHICLE IDENTIFICATION BLOCK PROCEDURE .
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.

  7. 10) Check CKP Sensor Amplitude At PCM

    Turn ignition switch to OFF position. Reconnect CKP sensor connector. Disconnect PCM connector(s). While cranking engine, measure voltage between PCM connector CKP(+) and CKP(-) terminals. If A/C voltage stabilized at more than .4 volt, CKP circuits are okay. Go to next step. If voltage stabilizes at .4 volt or less, check for amplitude fault. Go to step  12).

  8. 11) Check CKP(+) Circuit For Short To Ground At Sensor

    Measure resistance between negative battery terminal and CKP(+) terminal at PCM. If resistance is more than 10 k/ohms, go to TEST JB, step 1) . If resistance is 10 k/ohms or less, go to step  17).
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 11) to step 12). No test procedures have been omitted.

  9. 12) Check CKP Circuit Resistance For Amplitude Fault

    Turn ignition switch to OFF position. Measure resistance between PCM connector CKP(+) and CKP(-) terminals. If resistance is 900-1300 ohms (LS) or 300-800 ohms (all other models), go to step  16). If resistance is not as specified, go to next step.

  10. 13) Determine High Or Low Resistance Fault

    If resistance is less than 900 ohms (LS) or 300 ohms (all other models) in step  12), low resistance fault exists. Go to next step. If resistance is more than 1300 ohms (LS) or 800 ohms (all other models), replace CKP sensor.

  11. 14) Check For Short Between CKP(+) & CKP(-)

    Disconnect CKP sensor connector. Ensure PCM is disconnected. Measure resistance between CKP sensor harness connector terminals. If resistance is less than 5 ohms, repair short between CKP(+) and CKP(-) circuits. If resistance is 5 ohms or more, replace CKP sensor.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 14) to step 16). No test procedures have been omitted.

  12. 16) Check CKP Sensor & Pulse Wheel

    Check CKP sensor and pulse wheel for damage. Repair as necessary. If CKP sensor and pulse wheel are okay, replace CKP sensor.

  13. 17) Check For Open Or Short In PCM

    Turn ignition switch to OFF position. Disconnect CKP sensor connector. Reconnect PCM connector. Measure resistance between CKP sensor harness connector CKP (+) and CKP (-) terminal. If resistance is 16-24 k/ohms, go to next step. If resistance is not 16-24 k/ohms, replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Program PCM. See FLASH VEHICLE IDENTIFICATION BLOCK PROCEDURE .

  14. 18) Check For Short Circuit

    Ensure CKP sensor is disconnected. Disconnect PCM connector(s). Using a DVOM, measure resistance between PCM harness connector CKP(+) and CKP(-) terminals. See Fig 1-Fig 7 . If resistance is more than 1000 ohms, replace CKP sensor. If resistance is 1000 ohms or less, repair short between CKP(+) and CKP(-) circuits.

  15. 19) Determine If Fault Is Bias High Or Bias Low

    If voltage measurement in step  2) is less than one volt, low bias voltage fault exists. Go to next step. If voltage measurement in step  2) is 2 volts or more, high bias voltage fault exists. Go to step  21).

  16. 20) Check CKP(+) Circuit For Short To Ground In Harness

    Turn ignition switch to OFF position. Disconnect PCM connector(s). Using a DVOM, measure resistance between negative battery terminal and PCM harness connector CKP(+) terminal. See Fig 1-Fig 7 . If resistance is 10 k/ohms or less, repair short to ground in CKP(+) circuit. If resistance is more than 10 k/ohms, replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Program PCM. See FLASH VEHICLE IDENTIFICATION BLOCK PROCEDURE .

  17. 21) Check CKP(+) Sensor For Short To PWR

    Turn ignition switch to OFF position. Disconnect PCM connector(s). Turn ignition switch to ON position. Using a DVOM, measure voltage between negative battery terminal and PCM harness connector CKP(+) terminal. If voltage is .5 volt or more, repair short to PWR in CKP(+) circuit. If voltage is less than .5 volt, replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Program PCM. See FLASH VEHICLE IDENTIFICATION BLOCK PROCEDURE .
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