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Home >> GMC >> 2002 >> Jimmy 2D Utility, Part Time, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 385 (Engine Controls - System & Component Testing - 3.4L) >> Exhaust System >> Restricted Exhaust (Impala & Monte CARLO) >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 4  - The exhaust system has very low back pressure under normal conditions. If the exhaust system is restricted, a significant increase in the exhaust pressure is noticed on the Exhaust Back Pressure Gauge (J 35314-A). Removing the HO2S 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. 8  - 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 the diagnostic procedure on the opposite exhaust pipe.
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