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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 P1271: App Sensor 1-2 Performance >> Action Taken When DTC Sets

Action Taken When DTC Sets

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 control module stores the DTC information into memory when the diagnostic runs and fails.
  2. The Malfunction Indicator Lamp (MIL) will not illuminate.
  3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
  4. If one or more APP sensor DTCs are set for a single APP sensor, the following occurs:
    • The control module will not command Reduced Engine Power mode.
    • The control module will use the remaining two APP sensors to calculate throttle response.
  5. If certain multiple APP sensor DTCs are set for more than one APP sensor, the following occurs:
    • The control module commands Reduced Engine Power mode.
    • The APP indicated angle is limited to a predetermined value to limit the amount of throttle control.
    • The message center displays Reduced Engine Power.
  6. If all three APP sensors are out of range, the following occurs:
    • The control module commands Reduced Engine Power mode.
    • The APP indicated angle is limited to 0 percent. The control module only allows the engine to idle.
    • The message center displays Reduced Engine Power.
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