Possible Causes
WARNING: This page is about a different car, the 2003 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when misfiring of random cylinders is detected during any particular 200 or 1000 revolutions. Possible causes are:
- Open or short in engine wiring harness.
- Defective connections at ECM or component.
- Disconnected, restricted or damaged vacuum hose(s).
- Defective Positive Crankcase Ventilation (PCV) valve hose or connection.
- Ignition system malfunction.
- Defective fuel injector(s).
- Improper fuel pressure.
- Defective EGR system (3RZ-FE only).
- Defective Mass Airflow (MAF) meter.
- Defective Engine Coolant Temperature (ECT) sensor.
- Improper engine compression.
- Improper valve clearance.
- Improper valve timing.
- Defective ECM.