Circuit Description

WARNING: This page is about a different car, the 2002 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

Direct Ignition System (DIS) ignites one cylinder 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 an ignition signal (IGT signal) for each cylinder. Based on IGT signals, power transistors in ignitor cut off current to primary coil in ignition coil, causing ignition coil to fire the spark plug. At the same time, the ignitor delivers an ignition confirmation signal (IGF signal) to ECM to verify ignition coil has fired. DTC P1310 is for ignitor on ignition coil No. 3 and is set when there is no IGF2 signal to ECM when engine is running. If DTC P1310 exists, ECM will operate in fail-safe mode. Possible causes are:

Ignition system malfunction.
IGF2 or IGT3 circuit from ignition coil to ECM is open or shorted.
Defective ignition coil with ignitor.
Defective ECM.