Circuit Description

Direct Ignition System (DIS) is a 4-coil ignition system that ignites one cylinder with each ignition coil. Ignitor is integral to ignition coil. ECM determines ignition timing and outputs an ignition signal (IGT) for each cylinder. Based on IGT signals, power transistors in the ignitor cut off current to primary coil in ignition coil, causing ignition coil to fire spark plug. After delivering a command to turn off primary circuit on IGT wire, ECM monitors IGF circuit to ensure primary switching occurred. DTC P1300 is for ignitor on ignition coil No. 1 and is set when there is no IGF signal to ECM when engine is running. If DTC P1300 exists, ECM will operate in fail-safe mode. Possible causes are:

• Ignition system malfunction.
• IGF or IGT1 circuit from ignitor to ECM is open or shorted.
• Defective ignition coil/ignitor No. 1.
• Defective ECM.