LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 408 (Engine Controls - System Testing & Engine Component Tests - 3.1L) >> Emission Systems & Sub-Systems >> Restricted Exhaust >> Diagnostic Procedure - Malibu

Diagnostic Procedure - Malibu

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the customers complaint and proceed to next step.
  2. Did you review the exhaust symptoms diagnostic information and perform the necessary inspections? If yes, go to next step. If no, go to EXHAUST SYSTEM CHECK .
  3. Is the system equipped with dual exhaust? If yes, go to DIAGNOSTIC AIDS . If no, go to next step.
  4. Remove the AIR check valve or the HO2S that is in front of and closest to the catalytic converter. Install the Exhaust Back Pressure Gauge (J 35314-A), or equivalent, in place of the AIR check valve or HO2S sensor. Start the engine. Observe the exhaust system back pressure reading on the gauge. Does the reading exceed 2 psi (14 kPa)? If yes, go to next step. If no, go to step  8.
  5. Turn ignition switch to LOCK position. Re-install the AIR check valve/HO2S sensor. Remove the post-catalytst HO2S sensor. Install the exhaust backpressure gauge in place of the post HO2S sensor. Start the engine. Increase and monitor the engine speed at 2000 RPM. Observe the exhaust system backpressure reading on the gauge. Does the reading exceed 2 psi (14 kPa)? If yes, go to next step. If no, go to step  7.
  6. Check the exhaust system for damage in the exhaust pipe, debris in the exhaust pipe muffler or resonator internal failure or 2-layer exhaust pipe separation. Repair as necessary. After repair, go to step  8.
  7. Replace the catalytic converter. After repair, go to next step.
  8. Remove the exhaust backpressure gauge and reinstall the AIR check valve or the HO2S sensor. Clear any DTCs using the scan tool. Road test the vehicle to verify the repair. Did you correct the condition? If yes, system is okay at this time. If no, go to step  2.
scientia non olet · About LEMON Manuals