Suzuki XL7 2007 Service Manual page 953

Diagnostic Starting Point - Engine Exhaust
Begin the system diagnosis by reviewing the exhaust system description. Reviewing the exhaust system description
information will help familiarize you with the components of the exhaust system and the components intended
function. Refer to "Exhaust System Description". Also reviewing the engine exhaust symptoms information will help
you determine if the condition described by the customer is normal operation or if a malfunction exists. Refer to
"Symptoms - Engine Exhaust" in order to identify the correct procedure for diagnosing the system and where the
diagnostic procedure is located.
Symptoms - Engine Exhaust
• Review the exhaust system description in order to familiarize yourself with the exhaust system components and the
intended function of the components. Refer to "Exhaust System Description".
• All diagnostics on a vehicle should follow a logical process. Strategy Based Diagnostics is a uniform approach for
repairing all systems. The diagnostic flow is the place to start when repairs are necessary and may always be used
in order to resolve a system problem. For a detailed explanation, refer to "Strategy Based Diagnosis: ".
Visual/Physical Inspection
• Inspect for aftermarket or non-OEM devices such as, but not limited to; tailpipe extensions, headers, and exhaust
cutouts. Any aftermarket exhaust system devices could affect the operation and proper performance of the exhaust
system.
• Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, engine
temperature, engine load, and frequency of concern.
• Inspect the easily accessible or visible system components for obvious damage or conditions which could cause
any symptom.
Intermittent
Test the vehicle under the same conditions that the customer reported in order to verify the system is operating as
designed.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
• Loss of power
Refer to "Restricted Exhaust"
• Poor acceleration
Refer to "Restricted Exhaust"
• Poor fuel economy
Refer to "Restricted Exhaust"
• Excessive smoke diesel
Refer to "Restricted Exhaust"
• Exhaust hissing noise
Refer to "Exhaust Leakage"
• Exhaust popping noise
Refer to "Exhaust Leakage"
• Exhaust rattle noise
Refer to "Exhaust Noise"
• Loud exhaust noise
Refer to "Exhaust Noise"
• Exhaust buzz, groan, humm noise
Refer to "Exhaust Noise"
Diagnostic Information and Procedures
Exhaust System: 1K-4