Conditions For Setting DTC
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1998 GMC Yukon, 1998 GMC Suburban, 1998 GMC Pickup, 1998 GMC Cab & Chassis, and 1998 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
System will test motor circuits as follows:
- First, system checks voltage on each circuit.
- Then system supplies voltage on one circuit and read voltage back on other circuit.
- If system detects a problem, DTC is set.
- ATC control module senses high voltage on either circuit when a low voltage signal is expected.
When this DTC is set, all shifting will be disabled. SERVICE 4WD light will be on for remainder of current ignition cycle.