Here’s a detailed description of the electric steering rack (EPS) used in the Honda City TMO and Honda Jazz 2009 models:

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Electric Steering Rack Overview – Honda City TMO / Honda Jazz 2009

The Electric Power Steering (EPS) rack is a key component in modern vehicles like the Honda Jazz (2009) and the Honda City (TMO variant – a regional designation, often referring to models made in Thailand, Malaysia, etc.). This system replaces traditional hydraulic systems with electronically-assisted steering, improving efficiency, reducing weight, and requiring less maintenance.

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Key Specifications:

• Type: Electric Power Steering Rack (EPS)
• Motor Location: Column-mounted or rack-mounted motor (usually column-mounted in Jazz 2009)
• Steering Ratio: ~14.5 – 16:1 (may vary slightly depending on trim/market)
• Turns Lock-to-Lock: Approximately 2.7 to 3.1 turns
• Voltage: 12V electric motor
• Sensor Integration: Torque sensor and position sensors
• Connector: Multi-pin electric connector for EPS control module

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Main Components:

1. Electric Motor: Provides steering assistance by turning the pinion gear.
2. Torque Sensor: Detects driver input and sends signals to the EPS control module.
3. Control Module (ECU): Processes data and regulates motor assist.
4. Rack & Pinion Gear: Translates rotary motion from the steering column into linear motion to turn the wheels.
5. Position Sensor: Monitors the steering angle and feedback.

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Advantages:

• Improved fuel efficiency (no hydraulic pump)
• Variable steering assist based on speed
• Lower maintenance (no hydraulic fluid)
• Compact and lightweight

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Common Issues (especially in older EPS systems like 2009 Jazz):

• Steering stiffness or jerky motion
• EPS warning light on dashboard
• Noisy motor or clicking sounds
• Loss of power assist intermittently

These are often due to worn torque sensors, motor failure, or wiring/connectivity issues.

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Replacement/Repair Notes:

• OEM and aftermarket options are available.
• Rebuilt EPS racks can be cost-effective.
• Calibration/relearning may be needed after replacement.
• Avoid water intrusion – EPS systems are sensitive to moisture.

If you’re looking for a specific part number or compatibility confirmation, I can help you look it up based on your vehicle’s exact variant (engine size, region, trim, etc.). Let me know!