Diagnostic Aids
WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
This test is intended to diagnose the following:
- CKP sensor.
- Harness circuits: CKP (+) and CKP (-).
- PCM.
- Crankshaft Position Sensor
The Crankshaft Position (CKP) signal source is a variable reluctance sensor mounted in the right front side of the engine block. The sensor reacts to a target wheel on the crankshaft. The target wheel is a 60 minus 2 tooth steel disk with 58 evenly spaced teeth and a SYNC gap (a minus 2 slot wide tooth). The sensor produces pulses for each tooth edge that passes it. Crankshaft speed is derived from the frequency of the CKP sensor signal. The crankshaft position is determined by synchronizing the SYNC tooth with the SYNC gap signals from the target wheel. Diagnostic information on the CKP input signal is obtained by carrying out accuracy checks on frequency, and duty cycle with software strategies.The Powertrain Control Module (PCM) uses the CKP and camshaft position signal to calculate engine speed and piston position. The CKP sensor creates a signal used by the PCM to indicate cylinder identification in a particular bank. The CKP sensor contains a permanent magnet that creates a magnetic field. The signal is created when the target wheel rotates and breaks the magnetic field created by the sensor. The engine will not operate without a CKP signal.