Haltech Platinum Interceptor - Manual (Page 10)

Interceptor Manual
10
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Fuel Mode – Often a parameter is available that indicates if the ECU is in closed loop
mode or open loop mode. This aids in preventing factory ECU errors resulting from
applying inappropriate corrections whilst in closed loop mode
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Long Term Fuel Trim – Often factory ECUs monitor the closed loop control
corrections, and if they average away from 0%, a long term fuel correction is added to
enable the closed loop to work with a base injection time that is close to correct. This is
to allow the system to maintain correct operation as mechanical parts wear and affect the
fuel mixtures. Sometimes mechanical modifications can change the long-term fuel
correction significantly (larger injectors), and this could cause fault conditions. If the
tuner monitors the long term fuel correction, they can tune to minimize this value to
prevent any ECU fault conditions
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Ignition Timing – This parameter is useful to give the tuner the ability to know the
actual ignition timing being run. Note that the actual ignition timing is this value added
to the interceptor correction value.
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Knock Control Retard – This parameter indicates if the factory ECU is retarding
ignition in response to detection of pinging. It is recommended that the tuner adjust the
tune so that pinging does not occur in normal circumstances in order to get a consistent
power curve.
There are many generic scan tools available now that support a wide range of vehicles. It may
be necessary to research into the best scan tool to suit the vehicles that are dealt with most
commonly.