Circuit Description

Ignition Control Module (ICM) produces 24X reference signal. ICM calculates 24X reference signal by filtering Crankshaft Position (CKP) sensor 24X pulses when engine is running and CKP pulses are also being received. PCM uses this information to calculate engine speed and CKP at engine speeds less than 1200 RPM. PCM compares number of 24X reference pulses to 3X reference pulses and Camshaft Position (CMP) pulses. If PCM receives incorrect number of pulses, DTC P0336 will set.

Conditions required to set DTC are:

• Engine running and PCM receiving 3X reference pulses.
• Ratio of 24X reference pulses to 3X reference pulses received by PCM is incorrect.
• Conditions present for 30 seconds.