Acura Integra Speed Sensor Manual

The Acura Integra Speed Sensor is a critical component of the vehicle's speed measurement system, providing accurate speed data to the instrument cluster and engine control unit. This manual covers installation, operation, troubleshooting, and maintenance procedures for the speed sensor in various Acura Integra models. Below are key sections for safety, features, installation, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. Operation 4. Specifications 5. Controls and Connections 6. Testing Procedures 7. Maintenance 8. Compatibility 9. Safety Precautions 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Magnetic speed sensor assembly, wiring harness, mounting bracket, connector pins.

Feature	Description
Sensor Type	Magnetic pickup sensor
Output Signal	Pulse waveform
Operating Voltage	12V DC
Temperature Range	-40°C to 125°C
Connector Type	Weatherproof 3-pin connector
Mounting	Transmission-mounted
Compatibility	Manual and automatic transmissions
Signal Output	4 pulses per revolution
Resistance	190-250 ohms at 20°C
Material	Stainless steel housing

Installation

Proper installation ensures accurate speed readings and prevents damage to the sensor.

Locate transmission speed sensor port: Typically on transmission housing near differential.
Clean mounting surface: Remove any debris or old sealant from sensor port.
Apply thread sealant: Use high-temperature resistant sealant on sensor threads.
Install sensor: Hand-tighten sensor into port, then torque to 18-22 ft-lbs.
Connect wiring: Route harness away from heat sources and secure with zip ties.

WARNING! Do not overtighten sensor as this may damage internal components. Ensure proper alignment before final tightening.

Operation

The speed sensor generates electrical pulses proportional to vehicle speed.

Start vehicle: Sensor begins generating signals when vehicle is in motion.
Signal processing: ECU converts pulse frequency to speed reading.
Display: Speedometer displays calculated speed on instrument cluster.
Cruise control: Sensor provides speed feedback for cruise control system.
ABS integration: Some models use speed sensor data for ABS operation.

CAUTION! Sensor operation may be affected by strong magnetic fields or electrical interference.

Specifications

Part Number: 37510-P72-003
Voltage Range: 8-16V DC
Current Draw: 10mA maximum
Output Frequency: 0-2500 Hz
Air Gap: 0.5-1.5mm recommended
Thread Size: M12 x 1.25
Wire Length: 45cm standard harness
IP Rating: IP67 waterproof
Weight: 85 grams

Controls and Connections

Three-pin connector configuration: Pin 1 - Ground, Pin 2 - Signal Output, Pin 3 - Power Supply.

Connector Pinout: - Brown wire: Ground connection to chassis - Black/White wire: Signal output to ECU - Yellow wire: 12V power supply from ignition

Testing points: Use multimeter to check resistance between pins 1-2 (190-250 ohms). Signal verification requires oscilloscope for waveform analysis.

Testing Procedures

Diagnostic steps for verifying sensor operation and identifying faults.

Resistance test: Disconnect sensor, measure resistance between ground and signal pins.
Voltage test: With ignition on, check for 12V at power pin with ground reference.
Signal test: Connect oscilloscope to signal pin while rotating sensor target.
Continuity test: Verify wiring integrity from sensor to ECU connector.
Road test: Compare sensor reading with GPS or known accurate speed measurement.

Tip: Always test sensor with vehicle on jack stands for safety during signal verification.

Maintenance

Regular inspection ensures long-term reliability and accurate speed readings.

Visual inspection: Check for physical damage, corrosion, or fluid leaks every 6 months.
Connector check: Verify connector security and weather seal integrity.
Wiring inspection: Look for chafing, cuts, or heat damage to wiring harness.
Mounting verification: Ensure sensor remains properly torqued and aligned.
Cleaning: Use electrical contact cleaner on connector pins if corrosion present.

WARNING! Do not use high-pressure spray near sensor connector to prevent moisture intrusion.

Compatibility

Compatible with Acura Integra models: 1994-2001 (all trim levels). May require different mounting brackets for specific transmission types.

Safety Precautions

Always disconnect battery before installation or service. Use jack stands when working under vehicle. Avoid contact with hot exhaust components.

CAUTION! Working near transmission may expose you to hot fluids and moving parts. Allow vehicle to cool before beginning work.

Regulatory Information

FCC Part 15: Class B digital device; complies with automotive electromagnetic compatibility standards. Copyright © 2025 Acura; trademarks of Honda Motor Co., Ltd. For technical support, contact Acura Customer Service at 1-800-382-2238 or visit www.acura.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No speedometer reading	Sensor failure/wiring	Test sensor resistance; check wiring continuity to ECU.
Erratic speed reading	Loose connection	Inspect connector security; check for corrosion on pins.
Intermittent operation	Damaged wiring	Inspect harness for damage; repair or replace as needed.
Speed reading too high	Wrong sensor type	Verify correct part number; check pulse per revolution setting.
Speed reading too low	Sensor gap incorrect	Adjust sensor to target gap (0.5-1.5mm); check for debris.

Reset: Disconnect battery for 10 minutes to reset ECU if speed calibration is incorrect.

Service: 1-800-382-2238; www.acura.com