Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

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Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

1. Remove the HO2S 1. Refer to Heated Oxygen Sensor Replacement .
2. Install the J 35314-A exhaust back pressure tester, or equivalent, in place of the HO2S 1.
3. Allow the engine to idle at a normal operating temperature.
4. Observe the back pressure reading on the gauge.

Does the reading exceed the specified value?

8.6 kPa (1.25 psi)

Go to Step 4

Go to Step 3

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

Does the reading exceed the specified value?

20.7 kPa (3 psi)

Go to Step 4

System OK

Repair a restriction in the exhaust system. Possible faults include the following:

Is the action complete?

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Go to Step 5

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

Does the reading exceed the specified value?

20.7 kPa (3 psi)

Go to Step 2

System OK