General Information

Use this section to diagnose driveability problems that exist when a hard fault code is not present. Symptom checks are intended to direct the technician to malfunctioning component(s) for further diagnosis. A "symptom" should lead to further testing of specific components or systems, or verification of adjustment specifications.

This article will cover 3 areas of trouble shooting fuel injected vehicles when diagnostic codes are not present:

• Symptom Diagnostics
• Intermittent Diagnosis
• Turbocharger Diagnosis