Circuit Description

PCM checks validity of signals used in ION Sensing Module at various engine operating conditions. Test will return a fault if cylinder synchronization routine has not been completed after a predetermined number of events after crank. Test will detect fault that will prevent PCM from synchronization, such as Knock Signal (KI), Combustion Quality (CQ) lines being swapped, shorted spark plugs, ION Sensing Module faults and PCM hardware faults. Conditions for setting DTC:

• Ignition voltage is between 11 and 16 volts.
• Engine speed is between 650 and 6500 RPM.
• No ECT DTCs set.
• No injector DTCs set.
• No fuel trim DTCs set.
• No Misfire DTCs set.
• No system voltage DTCs set.