Haltech Platinum Sprint RE (HT050900) - Manual (Page 4)

Coolant Temperature Sensor
The coolant temperature sensor is designed to screw into a threaded hole and
protrude into the engine coolant stream. For air-cooled engines, the sensor can be
embedded directly into the engine block or used to sense oil temperature.
Locate a suitable position on the engine which will allow the hole and thread to be
drilled and tapped, and which gives access to the coolant stream. The sensor
should be mounted before the thermostat in the coolant circuit. Since most engines
have existing temperature sensor holes, it is often possible to mount the Haltech
sensor in one of these holes.
The coolant temp sensor plug is labeled with the letters A and B and should be
wired with the signal wire (violet) to pin B and sensor ground wire (black/white) to pin A.
Figure 2 – Coolant Temperature Sensor and Terminations
Throttle Position Sensor (TPS)
Your engine may have a Throttle position sensor already fitted and it is often
possible to make use of this TPS. The Haltech supplied TPS has a resistance
value ranging from 0 to 10k ohms. The resistance value of the installed TPS does
not have to be the same, since the ECU uses a throttle calibration function to
determine the position of the throttle, based on the signal received from the TPS.
Be sure to wire the TPS so that the ECU sees a lower value when at zero throttle
than at full throttle.
Note: Make sure that the axis of rotation of the shaft is exactly aligned with the axis
of rotation of the sensor, otherwise some binding may occur. Also, do not use the
TPS as a throttle stop. In either case, the TPS will be damaged.
Figure 3 – Throttle Position Sensor
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