Was the On Board Diagnostic (OBD) System Check performed?

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Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

1. Remove HO2S 1. Refer to Heated Oxygen Sensor Replacement .
2. Install Exhaust Back pressure tester J 35314-A or equivalent in place of HO2S 1.
3. Engine idling at normal operating temperature
4. Observe the exhaust system back pressure reading on the gage.

Does reading exceed the specified value?

8.6 kPa (1.25 psi)

Go to Step 4

Go to Step 3

1. With exhaust pressure tester in place of HO2S 1, increase engine speed to 2000 rpm.
2. Observe the exhaust system back pressure reading on the gage.

Does reading exceed the specified value?

20.7 kPa (3 psi)

Go to Step 4

System OK

Repair restriction in the exhaust system. Possible faults include:

Is the action complete?

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Go to Step 5

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1. With exhaust pressure tester in place of HO2S 1, increase engine speed to 2000 rpm
2. Observe the exhaust system back pressure reading on the gage.

Does reading exceed the specified value?

20.7 kPa (3 psi)

Go to Step 2

System OK