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 labelled 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
Startup
With the software now calibrated with correct fuel setup, ignition setup and trigger
setup, go to the Main setup menu and calibrate the throttle
Check to ensure that the fuel and ignition maps all have sensible values in them.
Check that all sensors are reading correctly by going to the engine data page and
viewing their values. Ensure the throttle reads smoothly from 0-100% in its full
range of movement. The MAP sensor should read atmospheric pressure
when the engine is stopped.
Power up the fuel pumps and check entire fuel system for leaks before attempting
to start the engine.
Once verified that all sensors are correctly operating and fuel system is functional,
attempt to start the engine. If engine does not start check:
1. Ignition Timing
2. Correct Fuel Pressure
3. Spark Plugs are not fouled or wet
4. Engine Compression
5. Ignition is wired in correct firing order
6. Ignition is firing on intake stroke not exhaust stroke
Once engine is running, ensure fuel pressure remains correct under all conditions and
that battery is charging.
