Symptoms Verification

Perform the Diagnostic System Check - Vehicle before using the symptoms. Verify that all of the following conditions are true:

• The engine control module (ECM) and the malfunction indicator lamp (MIL) are operating correctly.
• There are no DTCs stored.
• The scan tool data is within the normal operating range.
• Bulletins are not available for the current symptom.
• The ECM grounds are clean, tight, and in the correct locations.
• The vehicle tires are correctly inflated and meet original equipment specifications.
• The air filter element is not restricted.