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DTC - Diagnostic Trouble Codes information

P0303

Powertrain Codes

P0303 - SCION - Cylinder 3 Misfire Detected

Symptoms

- Engine Light ON (or Service Engine Soon Warning Light) - Lack/loss of power - Hard start - Engine hesitation

Possible Causes

- Faulty spark plug 3 - Faulty ignition coil 3 - Ignition coil 3 harness is open or shorted - Ignition coil 3 poor electrical connection - Clogged or faulty fuel injector 3 - Injector 3 harness is open or shorted - Injector 3 poor electrical connection - Improper spark plug 3 - Insufficient cylinder 3 compression - Incorrect fuel pressure - Intake air leak

When Detected

Engine Cylinder 3 is Misfiring.

Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.