Conditions for Setting the DTC
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- The IAH line voltage is between 3.8-8.1 volts with the IAH relay OFF.
- The IAH line voltage is less than 0.5 volt below battery voltage with the IAH relay ON.