OMEM710 Hardware Manual 2v11
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When cold, engines require different amounts of fuel (and air) to run correctly. The method for
setting-up the cold running and idle varies dependent on the load sensing and idle controls used.
Note that the cold setup cannot be done until the engine is fully mapped for warm conditions as all of
the cold running tables are modifiers on the warm running maps.
The below procedures may need to be followed several times to get the cold running correct, with
the running improving by smaller amounts each time until perfect.
No idle air bypass motor
Ensure that you have completed the warm idle and warm transient fuel setups before
continuing.
Arrange the screen so that you can see the Coolant Fuel Trim table, the Accel Coolant Trim
table, and the parameter Spark Idle.
Start the engine from cold any way possible. The cold running must be completed before the
cold starting can be completed so do not worry too much about the starting.
As the engine warms, watch the parameter Spark Idle. At all cold temperatures, adjust the
values in the Coolant Fuel Trim table to give the lowest number possible in Spark Idle. When
the Coolant Fuel Trim table is set at a particular temperature, blip the throttle and adjust the
Accel Coolant Trim table to give the lowest number possible at which the engine still
accelerates without stumbles.
With idle air bypass motor
Ensure that you have completed the warm idle and warm transient fuel setups before
continuing.
Arrange the screen so that you can see the Coolant Fuel Trim table, the Accel Coolant Trim
table, the Idle Duty Coolant table, and the parameters Engine Speed and Idle Set.
Start the engine from cold any way possible. This cold running tuning must be completed before
the cold starting can be completed.
As the engine warms, adjust the Coolant Fuel Trim table to give the highest possible engine
speed for the current idle motor opening, then adjust the Idle Duty Coolant table to make the
Idle Set parameter read near 0. This will be an iterative procedure as they both affect the
engine speed. When these tables are set at a particular temperature, blip the throttle and adjust
the Accel Coolant Trim table to give the lowest number possible at which the engine still
accelerates without stumbles.
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