Acura SH-AWD Manual

The Acura SH-AWD (Super Handling All-Wheel Drive) is an advanced all-wheel drive system designed to enhance vehicle stability, traction, and cornering performance. This system intelligently distributes torque between front and rear wheels and can overdrive the outside rear wheel during cornering for improved handling. Below are key sections covering system overview, operation, maintenance, troubleshooting, and specifications.

System Overview

The SH-AWD system consists of: Rear differential with electromagnetic clutch, torque transfer unit, vehicle stability assist, and electronic control unit.

Component	Function
Electromagnetic clutch	Controls torque distribution to rear wheels
Torque transfer unit	Distributes power between front and rear axles
Electronic control unit	Monitors vehicle dynamics and adjusts torque
Rear differential	Enables overdrive of outside rear wheel
Vehicle sensors	Monitor wheel speed, steering angle, lateral G-force
Hydraulic system	Provides pressure for clutch engagement
Cooling system	Maintains optimal operating temperature
Diagnostic port	For system monitoring and troubleshooting

Operation Principles

The SH-AWD system automatically engages based on driving conditions and vehicle dynamics.

1. Normal driving: Primarily front-wheel drive for fuel efficiency
2. Acceleration: Distributes torque to rear wheels for improved traction
3. Cornering: Overdrives outside rear wheel up to 5% faster than front wheels
4. Slippery conditions: Automatically transfers torque to wheels with best traction
5. High-performance driving: Maintains optimal torque distribution for stability

WARNING! System performance depends on proper tire condition and maintenance. Always maintain recommended tire pressure.

Maintenance Requirements

Regular maintenance ensures optimal SH-AWD system performance and longevity.

1. Fluid changes: Replace rear differential fluid according to service schedule
2. System inspection: Check for leaks, unusual noises, or warning lights
3. Sensor calibration: Ensure all vehicle sensors are functioning properly
4. Tire maintenance: Maintain equal tire wear and proper inflation
5. Software updates: Keep system software current for optimal performance

CAUTION! Use only Acura-approved fluids and components for maintenance.

Technical Specifications

• Torque Distribution: Up to 70% to rear wheels, 100% to either rear wheel
• Overdrive Capability: Up to 5% faster than front wheels
• Response Time: Milliseconds for torque transfer adjustments
• Fluid Capacity: 1.2 quarts Acura Dual Pump Fluid II
• Operating Temperature: -40°F to 300°F (-40°C to 149°C)
• System Weight: Approximately 120 pounds
• Compatible Models: TLX, MDX, RDX with SH-AWD
• Warranty: 6 years/70,000 miles powertrain coverage

Control Systems

The SH-AWD system integrates with multiple vehicle control systems for optimal performance.

Integrated Systems: Vehicle Stability Assist (VSA), Anti-lock Braking System (ABS), Electronic Power Steering (EPS), Traction Control System (TCS).

Operation Modes: Normal (automatic torque distribution), Sport (enhanced rear torque bias), Snow (optimized for low-traction conditions), Performance (maximum rear torque for aggressive driving). Monitoring: Continuous assessment of throttle position, steering angle, lateral acceleration, wheel speeds, and yaw rate.

Performance Features

The SH-AWD system enhances vehicle performance in various driving scenarios.

1. Improved cornering: Reduces understeer through rear wheel overdrive
2. Enhanced traction: Automatically adapts to changing road conditions
3. Stability control: Works with VSA to maintain vehicle control
4. Launch performance: Optimizes torque distribution for quick acceleration
5. Fuel efficiency: Primarily front-wheel drive during cruising

Tip: For maximum performance, use Sport mode during spirited driving.

Driving Techniques

Optimal driving techniques to maximize SH-AWD system benefits.

1. Smooth inputs: Gradual acceleration and steering for system optimization
2. Cornering: Maintain steady throttle through turns for torque vectoring
3. Adverse conditions: Trust system to automatically adjust to slippery surfaces
4. Performance driving: Use Sport mode for track or aggressive road driving
5. Fuel conservation: Gentle acceleration maintains front-wheel bias

WARNING! SH-AWD enhances capability but does not eliminate physics. Drive according to conditions.

Warning Indicators

Understanding SH-AWD system warning lights and their meanings.

Indicator	Meaning	Action Required
SH-AWD light	System malfunction	Have system inspected immediately
VSA light	Stability system issue	System may not function properly
ABS light	Braking system concern	Affects SH-AWD performance
Check Engine	Engine or emissions issue	May impact overall performance

Fluid Requirements

Proper fluid maintenance is critical for SH-AWD system longevity.

Recommended Fluid: Acura Dual Pump Fluid II or equivalent
Change Interval: Every 30,000 miles or 3 years
Capacity: 1.2 quarts (1.14 liters)
Specifications: Meets Acura 08200-9006 standards

CAUTION! Using incorrect fluid can cause permanent system damage.

Service Intervals

Recommended maintenance schedule for SH-AWD system components.

• Every 15,000 miles: Visual inspection for leaks and damage
• Every 30,000 miles: Fluid change and system diagnostic
• Every 60,000 miles: Comprehensive system inspection
• As needed: Sensor calibration and software updates
• Annually: Performance verification test

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
SH-AWD warning light	System malfunction	Diagnose with Acura diagnostic tool; check fluid level
Unusual noises	Worn components/low fluid	Inspect differential; check fluid level and condition
Reduced performance	Sensor issues/software	Update software; calibrate sensors; system reset
Vibration	Imbalanced tires/driveshaft	Balance tires; inspect driveshaft and couplings
Fluid leaks	Seal failure/component damage	Identify source; replace seals or damaged components

Reset Procedure: Disconnect battery for 10 minutes to reset system electronics.

Service: Contact Acura dealer or certified technician for professional diagnosis.