Circuit Description

The ECM determines ignition timing and outputs ignition signals (IGT) for each cylinder. Based on IGT signals, the ignitor controls the primary ignition signals (IGC) for all ignition coils. The ignitor also sends an Ignition Confirmation Signal (IGF) as a fail-safe measure to the ECM. If IGF signal is not input to ECM, the ECM will stop fuel injection as a fail safe function. DTC is set if there is no IGF signal to ECM for 6 consecutive IGT signals with engine running. Possible causes are:

• Open or short in IGF or IGT circuits.
• Ignitor.
• ECM.