Conditions for Setting the DTC
WARNING: This page is about a different car, the 2008 Suzuki Swift +, 2008 Pontiac Wave, and 2008 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
The control module detects a voltage above 5.5 volts, or below 4.5 volts, on either 5-volt reference circuit for greater than 0.5 second.