TMS-4 Tyre Monitoring System External Sensors

Performance Safety: TMS-4 Tyre Monitoring System (External)

The Haltech TMS-4 External Sensor TPMS offers the same high-resolution telemetry as the internal system but with the added convenience of External Sensors that screw directly onto the valve stems. This system is designed to provide your standalone ECU integration with real-time pressure and temperature data, enabling sophisticated safety logic without the need to dismount tyres. Controlled through Haltech’s NSP or ESP software, this system is a prerequisite for any track-focused K-swap or high-power RB26 build where tyre pressure stability directly affects traction control and aerodynamic rake. It transforms the often-ignored tyre state into a fundamental part of the vehicle’s data acquisition chain.

The Technology of Wireless Data Transmission

The TMS-4 receiver acts as a gateway on the vehicle’s CAN Bus network, listening for the encrypted RF signals sent by the four external sensors. These sensors are precision-calibrated to measure pressure and internal air temperature, transmitting data every 60 seconds while the vehicle is in motion. This Analogue-to-Digital interface allows the ECU to integrate tyre data into the Dashboard Display (like the iC-7) and internal logs. The external sensors are engineered to resist centrifugal force and are supplied with anti-theft lock nuts to ensure they remain secure during high-speed track sessions. This setup is ideal for tuners who frequently swap wheel and tyre combinations and need a portable, modular monitoring solution.

Operational Benefits: Proactive Engine and Chassis Protection

Using the TMS-4 system enables the tuner to set ECU Trouble Codes for critical tyre events. If the Pressure High/Low or Temperature High thresholds are breached, the Haltech ECU can initiate a safety map, such as reducing the boost target in closed-loop boost control or limiting RPM. This prevents a slow leak from turning into a high-speed blowout. In a fuel map calibration scenario, knowing the tyre temperature helps account for changes in the rolling resistance and traction levels of high-performance compounds (e.g., R-compounds or Slicks), ensuring that the Ignition Timing and power delivery are always matched to the available grip.

Fitment and Serviceability

This kit is designed for universal fitment on any vehicle utilizing a Haltech Nexus or Elite ECU. The external sensors feature replaceable CR1632 batteries, offering a lifespan of 1 to 2 years, making this system more cost-effective for long-term street and track use compared to internal units. The system includes a dedicated TE Mcon to DTM-4 CAN cable for a clean harness integration. During installation, the sensors should be screwed onto the valve stems and locked with the provided spanner. The receiver is compact and can be mounted within the cabin or near the wheel arches for optimal signal reception.

Technical Specifications

Summary & Includes

The TMS-4 External System is the professional’s choice for modular tyre telemetry. Includes: 1 x Haltech TMS-4 Receiver, 1 x CAN Cable, 4 x External Sensors, 4 x Anti-theft Lock Nuts, Lock Nut Spanner, and Mounting Hardware. Note: Batteries are user-replaceable; always check battery levels via the ECU software before track sessions.