Was the Powertrain 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. Carefully remove the Heated Oxygen Sensor (HO2S). Refer to Heated Oxygen Sensor Replacement .
2. Install the J 35314-A exhaust back pressure tester in place of the HO2S.
3. Start the engine and allow the engine to idle.

Is the back pressure more than the specified value?

8.6 kPa (1.25  psi)

Go to Step 4

Go to Step 3

1. Increase the engine speed to 2000 RPM.
2. Observe the back pressure gauge.

Does the reading exceed the specified value?

20.7 kPa (3 psi)

Go to Step 4

Go to Step 6

1. Check the exhaust system for a collapsed pipe, internal muffler failure, or any kind of heat distress.
2. Repair as necessary. Refer to Exhaust System Inspection in Engine Exhaust.

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 Exhaust.

Is the action complete?

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Go to Step 6

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Operate the vehicle within the conditions under which the original symptom was noted.

Does the system now operate properly?

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System OK

Go to Step 2