Circuit Description

Ignition Control Module (ICM) produces 18X reference signal. ICM calculates 18X reference signal by filtering Crankshaft Position (CKP) sensor 18X 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 18X 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 18X reference pulses to 3X reference pulses received by PCM does not equal 6.
• Ratio of 3X reference pulses to CMP pulses received by PCM equals 6.
• Conditions present for 600 engine revolutions.