Circuit/System Testing

WARNING: This page is about a different car, the 2006 Saturn Ion 3. However, it is still accessible from the selected car via links, so may be relevant.

Operate the engine within the conditions listed in the Freeze Frame Failure Records.
A current misfire should not be indicated.
- If a single cylinder Current Misfire is indicated, inspect the following components of the affected cylinder for proper operation:

The ignition coil-Refer to Electronic Ignition (EI) System Diagnosis .
The spark plug-Refer to Spark Plug Inspection .
The fuel injector-Refer to Fuel Injector Diagnosis .
- If more than one cylinder is randomly misfiring, inspect the following components condition and operation:

The vacuum hoses and seals-Refer to Emission Hose Routing Diagram .
The throttle body and intake manifold
The crankcase ventilation system-Refer to Crankcase Ventilation System Inspection/Diagnosis .
The ECM grounds
The exhaust system-Refer to Restricted Exhaust .
The fuel-Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
The spark plugs-Refer to Spark Plug Inspection .