Circuit/System Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.

Verify there are no HO2S or misfire DTCs set.
- If there is an HO2S or misfire DTC set, refer to DIAGNOSTIC TROUBLE CODE (DTC) LIST - VEHICLE DIAGNOSTIC INFORMATION to diagnosis the applicable DTC, before proceeding with this diagnostic procedure.
Verify the following conditions do not exist with the appropriate catalytic converter:
- Dents
- A severe discoloration caused by excessive temperatures
- Road damage
- An internal rattle caused by damaged catalyst substrate
- Restrictions
  - If a condition is found, replace the appropriate catalytic converter.
Verify the following conditions do not exist with the exhaust system:
- Leaks
- Physical damage
- Loose or missing hardware
- Properly torqued HO2S
  - If a condition is found, repair the exhaust system.
Verify the following conditions do not exist with the appropriate HO2S 2:
- A grounded wiring harness
- Damage
  - If a condition is found, replace the appropriate HO2S 2.
If no physical condition is detected and the HO2S 2 is as active as the HO2S 1 after operating the engine at 1,500 RPM for 1 minute and then returning to a stabilized idle, then replace the catalytic converter.