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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Engine Controls - Self-Diagnostics - 6.6L Diesel) >> Diagnostic Tests >> DTC P1191: Intake Air Duct Air Leak >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. The most likely cause of the DTC is a leaking intake duct after the MAF sensor.
  2. To run the diagnostic test the following conditions must be met:
    • The engine is at full operating temperature.
    • The vehicle is in drive.
    • The vehicle has been idling for more than 1 minute.
  3. After meeting these conditions, shift the vehicle into park, and hold the engine speed steady between 1500-2100 RPM for 30 seconds. If the diagnostic test still fails to run, the vehicle must be driven.
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