Haltech TMS-4 Quick Start Guide

Haltech TMS-4 Quick Start Guide

TMS-4 Overview

The Haltech TMS-4 is a simple, plug-and-play way to monitor tyre pressures through your Haltech ECU. The TMS-4 system is available in two kit forms, with different tyre pressure sensors. These can be mounted inside the tyre (HT-011600) or externally (HT-011601). Both sets of sensors are able to warn of air leaks, temperature variations, and when the pressure is over or under a set level. The external pressure sensors provided with the TMS-4 External Sensor Kit (HT-011601) can be fitted directly to the valves on a car’s tyres without the need to remove the tyres.

  1. Plug’n’Play with Haltech ECUs using NSP or ESP software packages
  2. Receiver operating temperature: -40°C to 85°C (-40°F to 185°F)
  3. Receiver environmentally sealed to IP67 standard
  4. Internal sensors environmentally sealed to IP67 standard (HT-011600)
  5. External sensors environmentally sealed to IP69 standard (HT-011601)
  6. Sensor operating temperature: -40°C to 125°C (-40°F to 257°F)
  7. Capable of reading up to 116psi air pressure

What's in the box?

TMS-4 Internal Sensor Kit (HT-011600)

  1. Haltech TMS-4 receiver
  2. TE MCON to DTM-4 CAN cable
  3. 4 x internal tyre pressure sensors
  4. Mounting Hardware: nut and washer set
  5. Warning sticker set
  6. Quick Start Guide

TMS-4 External Sensor Kit (HT-011601)

  1. Haltech TMS-4 receiver
  2. TE MCON to DTM-4 CAN cable
  3. 4 x external tyre pressure sensors
  4. Mounting Hardware: nut and washer set
  5. 4 x anti-theft lock nuts
  6. Lock nut spanner
  7. Quick Start Guide

TMS-4 Installation

Receiver installation

Install the receiver in the vehicle using the mounting hardware supplied. For best results installation location should be high in the vehicle.


The TMS-4 receiver connects via the supplied TE MCON to DTM-4 CAN Cable. Upon powering up an audible beep will be heard from the receiver to indicate it is on.

Sensor installation: Internal

  1. Deflate each tyre and remove from the wheels
  2. Remove the old tyre valve from each wheel
  3. Install the sensor in the corresponding wheel according to the position sticker on the sensor
  4. Re-install the tyre, ensuring sensor is not damaged during this process
  5. Reinflate the tyre to the desired pressure
  6. Perform a dynamic wheel balance

Sensor installation: External

  1. Remove the valve cap from the valve
  2. Inflate tyre to desired pressure
  3. Thread the anti-theft lock nut onto the valve
  4. Install the sensor in the corresponding tyre according to the position sticker on the sensor
  5. Tighten the lock nut using the spanner provided
  6. Check for leaks with soapy water

TMS-4 Setup

Enabling the TMS-4: NSP software

In NEXUS series ECUs the receiver is enabled through Connections > CAN > Haltech CAN System: Tyre Monitoring (TMS-4 Enable). It should also appear in the menu tree once detected on the Haltech CAN Bus and enabled from there.

Enabling the TMS-4: ESP software

In Elite series ECUs the receiver is enabled via the Main Setup (F4 page), then Devices: Tyre Monitoring (TMS-4 Enable). Once enabled it will appear next to CAN Devices.

TMS-4 Operation

Assigning sensors to wheels

Pressure sensors can be re-assigned to any wheel in the setup menu, which allows users swap wheels and re-assign sensors without physically swapping parts. By default sensors are assigned as per the stickers on the sensors. Sensors can also be turned off in the software if monitoring that wheel is not required.


The following data channels are available in both NSP and ESP software, as shown in the image below. TMS-4 channels can be searched for by using the keywords “tyre”, “tire”, and “wheel”.

Channels displayed:
  1. Per Tyre Pressure
  2. Per Tyre Temperature
  3. Per Tyre Sensor Voltage
  4. Per Sensor Pressure
  5. Per Sensor Temperature
  6. Per Sensor Battery Voltage
  7. Air Leak Detected (1 channel covers all 4 tyres)
  8. Recommended Tyre Pressures (for logging and display purposes only)

Diagnostic Trouble Codes

The TMS-4 can trigger several optional DTCs, including:
  1. Pressure High / Pressure Low
  2. Temperature High
  3. Air Leak Detected
  4. Sensor Battery Voltage Low
  5. Sensor Signal Loss
DTCs can be enabled within the TMS-4 setup menu. If a sensor is not assigned to a tyre, it cannot trigger a DTC. DTCs are referenced to the wheel the sensor is assigned to. For example, if Sensor 3 (RL) is assigned to the front left tyre and detects pressure is too low the “Front Left Tyre Pressure Low” DTC will trigger.

Over Temperature Alert

A DTC is flagged if any sensor is at or above the user defined maximum temperature entered.

Air Leak Detection

The TMS-4 system can warn of air leaks in tyres. Enabled by default in the software, Air Leak Detection can use sensor logic, or be manually user-defined. Sensor logic relies on the sensor flagging an air leak, then signals a DTC based on that flag. Users can also define their own pressure drop values in the TMS-4 setup menu. If a pressure drop of that
value (or greater) occurs over a 5 second period then the ECU flags an air leak.

Over / Under Pressure Detection

A DTC can be flagged when the air pressure readings fall below, or rise above, the user-defined pressure values for the front and rear pairs of tyres. Users can set maximum and minimum pressure values for pairs of tyres per-axle in the TMS-4 setup menu. A DTC is triggered if the pressure drops or rises, to under or over the pre-set values for 3 seconds or more. Both internal and external sensors have a working pressure range of 0-116 psi (0-800kpa).

Sensor Signal Loss Detection

A DTC triggers if signal loss is detected from any active sensors. Signal loss can only be detected when sensors are known to be awake so this requires vehicle speed to be enabled, as sensors activate during pressure change or when tyres are moving.

TMS-4 Maintenance

Battery Replacement - external sensors

The CR1632 battery used in the external pressure sensors can be easily replaced.
  1. Remove the sensor from the valve stem
  2. Unscrew the cover from the sensor
  3. Push the battery out of its holder
  4. Gently push replacement battery in
  5. Re-attach sensor to the valve stem
CR1632 batteries typically have a 1-2 year lifespan.

Battery replacement - internal sensors

The CR2023 batteries used in the internal tyre pressure sensors are not replaceable. These units have an average lifespan of 3 years, which is longer than the average life of a tyre.

Low battery Voltage detection

A DTC will be triggered if any sensor battery falls below 2.3V. Individual battery voltages can be monitored by the associated TMS-4 battery voltage channels.

TMS-4 Wiring Connections

Receiver wiring

The Haltech TMS-4 receiver uses a 6-pin TE MCON wiring connector. Both kits are supplied with a plug’n’play TE MCON to DTM adaptor cable, terminated with a four-pin DTM-4 connector.

TMS-4 Specifications

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