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. Carefully remove the Heated Oxygen Sensor (HO2S).
2. Install the exhaust backpressure tester J 35314-A in place of the HO2S.
3. Start the engine, and idle the engine.

Is the reading greater than the specified value?

8.6 kPa (1.25 psi)

Go to Step 4

Go to Step 3

1. Increase the engine speed to the specified value.
2. Observe the backpressure gauge.

Does the reading exceed the specified value?

2000 RPM

20.7 kPa (3 psi)

Go to Step 4

Go to Step 6

1. Check the exhaust system for the following conditions:

-	A collapsed pipe

-	An internal muffler failure

-	Heat distress

2. If you find a problem, repair the condition as necessary.

Did you find a problem?

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Go to Step 6

Go to Step 5

Replace the catalytic converter. Refer to Catalytic Converter Replacement in Engine Controls.

Is the action complete?

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Go to Step 6

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Operate the vehicle within the conditions during which you noted the original symptom.

Does the system now operate properly?

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System OK

Go to Step 2