The numbers below refer to the step numbers on the diagnostic table.
The exhaust system has very low back pressure under normal conditions. If the exhaust system is restricted, a significant increase in the exhaust pressure is noticed on an exhaust back pressure gage.
Removing the heated oxygen (HO2S) sensor may set a diagnostic trouble code (DTC). When finishing this diagnostic table, be sure to clear all codes.
This step will isolate the catalytic converter from the remainder of the exhaust system.
Step | Action | Yes | No | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you verify the customers complaint? | Go to Step 2 | -- | ||||||||||
2 | Did you review the exhaust symptoms diagnostic information and perform the necessary inspections? | Go to Step 3 | |||||||||||
3 |
Warning: While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.
Does the reading exceed the specified value? | Go to Step 4 | Go to Step 7 | ||||||||||
4 |
Does the reading exceed the specified value? | Go to Step 5 | Go to Step 6 | ||||||||||
5 | Inspect the exhaust system for the following conditions:
Did you find and correct the condition? | Go to Step 7 | -- | ||||||||||
6 | Replace the catalytic converter. Refer to Catalytic Converter Replacement. Did you find and correct the condition? | Go to Step 7 | -- | ||||||||||
7 |
Did you correct the condition? | System OK | Go to Step 2 |