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Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 4:  The exhaust system has very low backpressure under normal conditions. If the exhaust system is restricted, a significant increase in exhaust pressure is noticed on the J 35314. Note: Removing the O2S sensor may set a DTC. When finishing this diagnostic table, be sure to clear all codes.
  2. 5:  This step will isolate the catalytic converter from the remainder of the exhaust system.
  3. 7:  Confirming that the condition has been fixed is essential. If the symptom still exists and the vehicle has a dual exhaust system, proceed to Step 2 and repeat diagnostic procedure on the opposite exhaust pipe.
Restricted Exhaust

Step Action Values Yes No
1 Did you verify the customer's complaint? - Go to Step 2  -
2 Did you review the exhaust symptoms diagnostic information and perform the necessary inspections? - Go to Step 3  Go to Symptoms - Engine Exhaust 
3 Is the system equipped with dual exhaust? - Go to Diagnostic Aids Go to Step 4 
4 
  1. Remove the O2S that is in front of and closest to the catalytic converter.
  2. Install the J 35314-A  in place of the O2S sensor. See Special Tools and Equipment .
  3. Start the engine.
  4. Observe the exhaust system backpressure reading on the gage.
Does the reading exceed the specified value?		 14 kPa (2 psi) Go to Step 5  Go to Step 7 
5  Inspect the exhaust system for the following conditions:
  • Damage to the exhaust pipe
  • Debris in the exhaust pipe
  • Muffler or resonator internal failure
  • Two-layer exhaust pipe separation

Did you find and correct the condition?		 - Go to Step 7  Go to Step 6 
6 Replace the catalytic converter. Refer to Catalytic Converter Replacement .
Is replacement complete?		 - Go to Step 7  -
7 
  1. Remove the J 35314-A  and reinstall the O2S sensor. See Special Tools and Equipment .
  2. Clear any codes.
  3. Road test the vehicle in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 2 
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