Test Description

The numbers below refer to the step numbers in the diagnostic procedure:

1. 4
   
   When engine is idling or at steady cruise, HO2S voltage should vary between about 100-900 mV. During Power Enrichment mode, more fuel is needed, and HO2S voltage should rise to above 447 mV. This step verifies that Bank 1 HO2S is operating properly.
2. 5
   
   Wrap a shop towel around the fuel pressure connector to absorb any small amount of fuel leakage that may occur when installing gauge. When ignition is on, pump pressure should be 34-46 psi (235-320 kPa).
3. 7
   
   Be careful to use correct pliers so fuel lines will not be damaged.