Can AWD vehicles with on-demand 4WD undergo roller testing?

[DiFinley]

AWD vehicles with on-demand 4WD can undergo roller testing, but the testing method requires using the dual-idle operating condition method, not the simulated driving condition method used for 2WD vehicles. For on-demand 4WD vehicles, the 4WD system will automatically engage without manual control, so it's important to inform the inspector about the vehicle's configuration during testing. Additional information: On-demand 4WD only switches to four-wheel drive when appropriate, otherwise it remains a two-wheel drive system. The system automatically switches between 2WD and 4WD modes based on road conditions without requiring manual operation. On-demand 4WD differs from part-time 4WD that requires manual switching between 2WD and 4WD, as well as full-time 4WD that operates in four-wheel drive under all conditions.