The purpose of this service bulletin is to address problems related to the Secondary Air Injection (SAI) system. Two possible Diagnostic Trouble Codes (DTCs) that may be encountered include P0492 (ECM2, AIR System Insufficient Flow Bank 2) and P0491 (ECMI, AIR System Insufficient Flow Bank and SAI System Control). The bulletin provides guidance on troubleshooting and diagnosis of these issues, including a workshop procedure and recommended replacement of faulty components.
Key Findings:
The SAI pump to SAI control valve pipe may loosen over time, causing leaks or failure of the SAI system. Additionally, vacuum pipes for the SAI control valve may not be correctly attached, leading to operational failure.
Recommended Action:
Dealers are advised to attach a smoke leak tester to the SAI pump side pipe to check for leaks and to ensure that all vacuum connections are correctly attached. Further diagnosis may be required, and complete workshop manual procedures should be followed.
Manual:
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