P1315 – Igniter Circuit Malfunction (Toyota)
Description
The ECM detected a malfunction in the igniter circuit, affecting ignition timing and combustion stability.
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Symptoms
- Engine misfire
- Rough idle
- Poor acceleration
- Hard starting
- Check engine light on
Causes
- Faulty ignition coil
- Damaged igniter circuit
- Connector corrosion
- Wiring issues
- ECM ignition driver fault
Diagnosis
- Test ignition coil
- Inspect wiring
- Check connectors
- Measure coil resistance
- Scan for related codes
Repair
- Replace ignition coil
- Repair wiring
- Clean connectors
- Replace ECM if needed
