853678T Throttle Position Sensor for MerCruiser 4.3L 5.0L 5.7L 6.2L 7.4L 8.1L | JLM Marine

Throttle Position Sensor for MerCruiser 4.3L 5.0L 5.7L 6.2L 7.4L 8.1L V6 V8 Inboard Sterndrive

This Throttle Position Sensor (TPS) is designed for MerCruiser V6 and V8 inboard sterndrive marine engines, including 4.3L, 5.0L, 5.7L, 6.2L, 7.4L, and 8.1L models. It ensures accurate throttle position monitoring for optimal engine performance and fuel efficiency.

Direct Replacement For: MerCruiser OEM #853678T, #8M0097035, #802623, #853678; Sierra #18-7700.

• High-quality aftermarket replacement for MerCruiser throttle position sensors
• Compatible with multiple MerCruiser V6 and V8 engine configurations
• Precision-engineered for reliable throttle signal transmission

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 × Throttle Position Sensor (Marine Engine Application)

Installation Guide

1. Disconnect the battery: Always disconnect the negative battery terminal before beginning any electrical work to prevent short circuits.
2. Locate the existing TPS: The throttle position sensor is typically mounted on the throttle body of your MerCruiser engine.
3. Disconnect the electrical connector: Carefully unplug the wiring harness connector from the old sensor.
4. Remove mounting fasteners: Remove the screws or bolts securing the old TPS to the throttle body.
5. Remove the old sensor: Gently pull the old throttle position sensor away from the throttle body.
6. Clean the mounting surface: Wipe the throttle body mounting area clean of any debris or old gasket material.
7. Position the new sensor: Align the new TPS with the throttle shaft and mounting holes on the throttle body.
8. Install mounting fasteners: Secure the new sensor with the original screws or bolts, tightening to manufacturer specifications.
9. Reconnect the electrical connector: Firmly plug the wiring harness back into the new sensor until it clicks into place.
10. Reconnect the battery: Reconnect the negative battery terminal.
11. Test the installation: Start the engine and verify smooth throttle response and proper idle. Check for any warning lights or error codes.
12. Final inspection: Ensure all connections are secure and there are no loose wires or components.

Troubleshooting & FAQ

Q: How do I confirm this throttle position sensor fits my MerCruiser engine?
A: Cross-reference your current part number with those listed in our Part Number Cross-Reference table (853678T, 8M0097035, 802623, 853678, or Sierra 18-7700). Also verify your engine displacement (4.3L, 5.0L, 5.7L, 6.2L, 7.4L, or 8.1L) matches our compatibility chart.

Q: What are the symptoms of a failing throttle position sensor?
A: Common signs include rough or erratic idle, hesitation during acceleration, poor fuel economy, engine stalling, and the Check Engine light illuminating. The engine may also exhibit poor throttle response or surging.

Q: How often should I replace the throttle position sensor?
A: TPS units typically last 50,000-100,000 miles or 5-10 years under normal conditions. Replace it when you experience throttle-related performance issues or if diagnostic codes indicate TPS failure.

Q: Will this aftermarket sensor perform the same as the original MerCruiser part?
A: Yes, this sensor is manufactured to OEM specifications and provides equivalent performance. It undergoes the same quality testing to ensure accurate throttle position signal transmission to your engine's ECU.

Q: Do I need to calibrate or program the new sensor after installation?
A: Most MerCruiser TPS installations do not require calibration—the sensor self-adjusts during operation. However, clearing any stored error codes with a diagnostic tool after installation is recommended for optimal performance.

Q: Is this an OEM or aftermarket part?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.