Acura’s SH-AWD System: AWD Performance Leader
Figure 3: Operational Flow Chart
applied to the rear wheels independent- ly, based on the lateral G-force input and the direction of the turn. This helps steer the vehicle through the turn. 2. Feedback Control: The feed-
back control program uses inputs to identify low traction conditions. In low
traction conditions, the SH-AWD con- trol module distributes torque to the rears wheels as needed to provide opti- mum traction. The SH-AWD control module con-
trols the AWD system by adjusting the amount of torque distributed to
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the rear wheels. The SH-AWD con- trol module sends a constantly varying signal to the electronically controlled differential main coils, which engage the electromagnetic clutches in the rear differential. By constantly varying the signal to the electromagnetic clutches, the SH-AWD module is capable of controlling the amount of torque being delivered to each rear wheel (figure 3).
Diagnosing Acura’s
SH-AWD System
Diagnosing Acura’s SH-AWD sys-
tem is pretty straightforward. When the SH-AWD control module detects a problem, it lights the SH-AWD indi- cator light, sets a DTC, commands the AWD system to front wheel drive operation only, and informs the PCM to reduce engine torque until the fault in the SH-AWD system has been cor- rected.
The SH-AWD control module may
also light the SH-AWD indicator light for non-AWD related issues, including: • Using high-powered wireless devices in the vehicle (such as CB or Ham radio). • Slipping or spinning the rear wheels while the vehicle is stuck in sand, mud or snow. • System voltage drops below 8 volts or rises above 16 volts.
During these situations, the SH-AWD indicator light will stay on
GEARS May/June 2010
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