HF7 - Check For Obvious Leak Sources In the Exhaust System

*** THIS ARTICLE REFLECTS CHANGES MADE BY TSB # 9326B7, December 1993

NOTE: If a catalyst is in series with a leaking exhaust system, it can fail the Catalyst Efficiency Monitor test.

- Key Off.

- Inspect the following for leaks, cracks, loose connections or punctures:
- Exhaust manifold.
- Front exhaust pipe.
- Rear exhaust pipe.
- Muffler/tail-pipe assembly.

- Are the above components free of cracks and punctures, etc.?

YES -- CHECK that the exhaust manifold to catalyst inlet pipe joint is tight. GO to HF8. HF8 - Check For Obvious Restrictions In the Exhaust System

NO -- REPLACE/REPAIR the leak source(s). COMPLETE the PCM reset to clear all DTCs. Clearing Diagnostic Trouble Codes

Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes