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. The 6.8L 10-cylinder pulse wheel has 39 teeth spaced 9 degrees apart and one 9 degree 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
- A/C compressor field coil electrical connector
- A/C compressor bolt (3 required)
- A/C compressor
- Crankshaft position (CKP) sensor electrical connector
- CKP sensor bolt
WARNINGIf equipped with fire suppression system, disable the system before performing repairs.
- Disconnect the battery ground cable.
Rotate the drive belt tensioner clockwise, and remove the drive belt from the A/C compressor pulley.
- Disconnect the A/C compressor field coil electrical connector.
- Disconnect the crankshaft position sensor (CKP) sensor electrical connector.
Remove the nut and detach the wiring harness clips. To install, tighten to 80 inch lbs. (9 Nm)
Loosen the 3 A/C compressor bolts enough slide the compressor down one inch, allowing access for CKP sensor removal. It is not necessary to completely remove the A/C compressor bolts. To install, tighten to 18 ft. lbs. (25 Nm).
- Remove the CKP sensor bolt. To install, tighten to 89 inch lbs. (10 Nm).
- Remove the CKP sensor.
To install, reverse the removal procedure.
Check the CKP Sensor resistance
Is resistance between 250-1,000 ohms-
Yes: CKP Sensor resistance is within acceptable limits. Proceed to pin test.
No: Replace the CKP Sensor and verify repair.
CMP Sensor Pin Testing
This pinpoint test is intended to diagnose the following: