Ford Mustang 1999-2005

Crankshaft Position Sensor



The Crankshaft Position (CKP) sensor, located on the front cover (near the crankshaft pulley) is used to determine crankshaft position and crankshaft rpm. The CKP sensor is a reluctance sensor which senses the passing of teeth on the sensor ring because the teeth disrupt the magnetic field of the sensor. This disruption creates a voltage fluctuation, which is monitored by the PCM.

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Fig. The Crankshaft Position (CKP) sensor is mounted on the engine front cover, and senses the teeth on the sensor ring as they pass through its magnetic field

The CKP sensor is a magnetic transducer mounted on the engine block adjacent to a pulse wheel located on the crankshaft. By monitoring the crankshaft mounted pulse wheel, the CKP is the primary sensor for ignition information to the PCM. The pulse wheel has a total of 35 teeth spaced 10 degrees apart with one empty space for a missing tooth. By monitoring the pulse wheel, the CKP sensor signal indicates crankshaft position and speed information to the PCM. By monitoring the missing tooth, the CKP sensor is also able to identify piston travel in order to synchronize the ignition system and provide a way of tracking the angular position of the crankshaft relative to a fixed reference for the CKP sensor configuration. The PCM also uses the CKP signal to determine if a misfire has occurred by measuring rapid decelerations between teeth.

Removal & Installation

4.0L Engine

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Fig. Crankshaft Position Sensor-4.0L engine

  1. Disconnect the battery ground cable.
  3. Disconnect the crankshaft position (CKP) sensor electrical connector.
  5. Remove the CKP sensor bolt. To install, tighten to 89 inch lbs. (10 Nm).
  7. Remove the CKP sensor.
  9. To install, reverse the removal procedure.

4.6L & 5.4L Engines

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Fig. Crankshaft Position Sensor-4.6L and 5.4L engines

  1. With the vehicle in NEUTRAL, position it on a hoist.
  3. Remove the supercharger (SC) belt (5.4L engine only).
  5. Remove the accessory drive belt.
  7. Detach the wiring harness retainers from the A/C compressor stud bolts.
  9. Disconnect the A/C compressor field coil and the Crankshaft Position (CKP) sensor electrical connectors.
  11. Remove the 3 stud bolts and position the A/C compressor aside.
    1. To install, tighten to 18 ft. lbs. (25 Nm).

  13. Remove the CKP sensor bolt and sensor.
    1. To install, tighten to 89 inch lbs. (10 Nm).

  15. To install, reverse the removal procedure.


  1. Using a DVOM set to the AC scale to monitor less than 5 volts, measure the voltage between the sensor Cylinder Identification (CID) terminal and ground by back probing the sensor connector. If the connector cannot be backprobe, fabricate or purchase a test harness. The sensor is okay if the voltage reading varies more than 0.1 volt with the engine running at varying RPM.

Check the CKP Sensor resistance

Key in OFF position
Measure the resistance between:


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Fig. Crankshaft Position Sensor connector

If the CKP sensor resistance is between 250-1,000 ohms, sensor resistance is within acceptable limits, proceed to pin test.

If the resistance is not within the specified resistance range, replace the CKP Sensor and verify the repair.

CMP Sensor Pin Testing

For reference values, refer to PCM testing-PCM reference voltage pin chart

This pinpoint test is intended to diagnose the following:

Crankshaft Position (CKP) sensor (6C315)
Harness circuits: CKP(+) and CKP(-)

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Fig. CKP Sensor connector view