Checking and replacing the crankshaft fluctuation sensor (CKF) (Honda Civic 6)

The CKF sensor consists of a pulsation rotor located on the front crankshaft journal and an induction sensor assembly mounted on the engine near the rotor. The ECM/PCM uses the information from the CKF sensor to determine the amount of change in engine speed (fluctuations in revolutions) crankshaft. If the fluctuations are outside the permissible range, the control module interprets this as a signal that misfires have occurred.

Examination

1. Locate the CKF sensor wiring connector on the engine block on the timing belt side (see accompanying illustration). Make sure the ignition key is turned to the OFF position and disconnect the connector.

2. Connect an ohmmeter between the two outer terminals of the connector (not to the central terminal). The measurement result should be in the range of 1.6÷3.2 kOhm, otherwise replace the sensor.

3. Connect an ohmmeter between the body ground and each of the outer terminals of the connector in turn. If there is continuity, replace the sensor.

Replacement

1. Remove the cylinder head cover, crankshaft pulley and timing belt cover (see Engine Repair Without Removing It From The Car - Civic Models).



2. Disconnect the sensor wiring connector and remove the mounting bolt.

3. Installation is carried out in reverse order.