Circuit Description
WARNING: This page is about a different car, the 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
ECM determines ignition timing and outputs ignition signals (IGT) for each cylinder. Based on IGT signals, ignitor controls the primary ignition signals for all ignition coils. Ignitor also sends an ignition confirmation signal (IGF) as a fail-safe measure to the ECM. DTC is set when there is no IGF signal to ECM for 6 consecutive IGT signals during engine operation. If DTC P1315 exists, ECM will operate in fail-safe mode. Possible causes are:
- IGF or IGT4 circuit from ignitor to ECM is open or shorted.
- Defective ignitor/ignition coil.
- Defective ECM.