Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
A low AIR system volume may cause a DTC P1415 or P1416, or an intermittent complaint. Also check for the following conditions:
- Pinched, kinked, or restricted AIR pipes, hoses, or fittings
- Leaks, holes, loose fittings, or hoses
- Restricted or obstructed AIR pump inlet
An AIR supply hose that is melted before the check valve could indicate exhaust gas back-flow past the check valve.
An intermittent may be caused by a poor connection, rubbed through wire insulation, or a broken wire inside the insulation. Thoroughly check any circuitry that is suspected of causing the intermittent complaint for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal to wire connections
- Physical damage to the wiring harness
- Corrosion
- Moisture in the connector