Typical Scan Tool Data

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

GEN-F Terminal Signal - ECM

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Engine running. Parameter Normal Range: 5-99%
B+	0%	0%	-
Field Duty Cycle Signal	0%	0%	99%