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 heated oxygen sensor 1 (HO2S 1) from the exhaust manifold.
2. Install the J 35314-A exhaust back presssure tester in place of the HO2S 1.

Is the action complete?

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Go to Step 3

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Important: Place the transmission in Park or Neutral when checking the exhaust system backpressure. Accurate backpressure readings can not be obtained unless the vehicle remains in Park or Neutral for all tests.

1. Start the engine.
2. Observe the exhaust system back pressure reading on the gauge with the engine idling in Park or Neutral. The reading should not exceed the specified value.

Does the reading exceed the specified value?

8.6 kPa (1.25 psi)

Go to Step 5

Go to Step 4

Increase the engine speed to 2,500 RPM and observe the back pressure reading on the gauge. The reading should not exceed the specified value.

Does the reading exceed the specified value?

8.6 kPa (1.25 psi)

Go to Step 5

Go to Step 7

1. Check the exhaust system for a collapsed pipe, heat distress, or an internal muffler failure.
2. Replace any component that is found to be malfunctioning.

Did any component require replacement?

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Go to Step 7

Go to Step 6

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

Is the action complete?

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Go to Step 7

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1. Allow the engine to idle until a normal operating temperature is reached.
2. Check for any DTCs.

Are any DTCs displayed that have not been diagnosed?

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Go to Diagnostic Trouble Code (DTC) List

System OK