Circuit Description
WARNING: This page is about a different car, the 2002 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
Direct Ignition System (DIS) ignites 2 cylinders simultaneously with one ignition coil. Ignitor is integral to ignition coil. Direct ignition system may also be referred to as distributorless ignition system. ECM determines ignition timing and outputs ignition signal (IGT signal) for each cylinder. Based on IGT signals, ignitor controls primary ignition signals (IGC) for all ignition coils. At the same time, the ignitor delivers an ignition confirmation signal (IGF signal) to ECM to verify ignition coil has fired. DTC is set when there is no IGF signal to ECM for 3 consecutive times during 6 consecutive IGT signals when engine is running. If DTC P1300 exists, ECM will operate in fail-safe mode. Possible causes are:
- Ignition system malfunction.
- IGF or IGT circuit from ignition coil to ECM is open or shorted.
- Defective ignition coil or ignitor.
- Defective ECM.