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Home >> Saturn >> 1997 >> SW2 Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Trouble Codes >> DTC P0301, P0302, P0303 Or P0304 - Specific Cylinder Misfire Detected >> Diagnostic Aids

Diagnostic Aids

When diagnosing an intermittent problem, use scan tool to review malfunction history diagnostic information. This data can be used to duplicate a problem. If an injector, EST or EGR DTC is active and a misfire is active, diagnose those problems first. Use scan tool to monitor active misfire counts. Spraying water on wires will find bad wire(s). The scan tool active misfire counts should pick up an intermittent misfire problem. Watch scan tool misfire counter. When a specific cylinder misfires under certain load, conditions may be duplicated in the shop.

See IGNITION COMPONENT SPECIFICATION  table to help in diagnosis.

Fig 1: Misfire Diagnostic Diagram
G00171231Courtesy of GENERAL MOTORS CORP.
Fig 2: Crankshaft Position Sensor Component Location
G00171232Courtesy of GENERAL MOTORS CORP.
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