User guide

F10X Manual

SECTION2 Tuning The Engine

CHAPTER 6 STARTING THE ENGINE

Once the ECU is installed and the set-up has been completed it is time to try to start the

engine. Before cranking the engine there are a few things that need to be done. Make sure

that the ECU is powered (ignition on) and the Haltech Software is online. Go to the Engine

Data Page to check that the ECU is communicating properly, and that the sensors are reading

correctly. Check again that the set-up information is correct.

6.1 Calibrating the Throttle Position Sensor

The throttle sensor must be calibrated so that the ECU knows the start and stop positions of

the sensor. First, set the idle throttle opening using the idle-adjust screw. If the required

opening for idle is not known, make an estimate but keep in mind that this may be the reason

for poor idle later on, and further adjustment may be needed. Choose the "Throttle Setup"

item from the setup menu and follow the instructions on the screen.

Finally test the throttle calibration by opening the engine data page checking that when the

throttle is closed the throttle position reads “0%” and when the throttle is opened it reads

“100%”. If this test fails try recalibrating the throttle. If you continue to have problems refer

to the troubleshooting guide in the appendix.

6.2 Checking the Trigger

It is a good idea to check that the ECU is receiving a reliable trigger signal. Disable the

injector outputs in the Fuel Set-up page to cut all fuel delivery to the injectors. The engine

should then be cranked over on the starter. The engine speed is displayed on the engine data

page and should read about 100 to 300 rpm. If the engine speed is zero or is erratic then there

is a problem with the trigger set-up, check for these problems and rectify any faults found. If

you continue to have problems refer to the troubleshooting guide in the appendix.

should be disabled and fuel injectors enabled so an attempt may be made to start the engine.

6.3 Determining Engine Fuel Needs

The ECU should now have sufficient set-up information to start and control the engine. The

basic fuel map loaded into the ECU at the factory may allow the engine to start and run. The

following paragraphs should offer enough information to get the engine running and idle

smoothly.

WARNING:

WHEN TUNING AN ENGINE, ESPECIALLY UNDER LOAD, IT IS

ADVISABLE TO HAVE AN INDICATION OF THE AIR-FUEL RATIO

AT WHICH THE ENGINE IS RUNNING. IT IS RECOMMENDED

THAT A WIDE-BAND OXYGEN SENSOR BE USED FOR THIS SINCE

IT DISPLAYS THE AIR-FUEL RATIO QUICKLY.