Diagnosis Index

- If you are here with a Secondary Air Injection (AIR) Diagnostic Trouble Code (DTC) and did not complete pinpoint test KC, please do so.
- The tests in diagnosis by symptom are dependent on the results from pinpoint test KC. If an AIR DTC is still present after completing pinpoint test KC, please continue diagnostics by symptom. Diagnosis By Symptom
- If more than one component is listed as a possible cause, begin diagnostics with first component.
- Verify the type of components on the vehicle and how they function.
- Refer to the Vehicle Emission Control Information (VECI) decal located under the hood for emission system vacuum routing information.
- All symptoms without DTC, go to diagnosis by symptom. Diagnosis By Symptom