| WARNING | Read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS . |
| CAUTION | If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM electrical connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction. |
Circuit Description
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 P1305 is for ignitor on ignition coil No. 2 and is set when there is no IGF signal to ECM when engine is running. If DTC P1305 exists, ECM will operate in fail-safe mode. Possible causes are
- Ignition system malfunction.
- IGF or IGT2 circuit from ignition coil to ECM is open or shorted.
- Defective ignition coil with ignitor.
- Defective ECM.
Diagnostic Aids
Using Toyota hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.