Maintenance
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B
To align the throttle body, use the diagnostic software.
For the engine to work properly, adjust the throttle body
so that the idling regime control works at “mid-range”.
To do this, after finding the correct alignment, proceed
as follows:
If the “Idle lead correction” channel is NEGATIVE,
close the bypass valves to take air out, keeping it
aligned until the “Lead correction” setting goes to work
within a range of -4° to +4°.
If the “Idle lead correction” channel is POSITIVE, open
the bypass valves to add air, keeping it aligned until the
“Idle lead correction” setting goes to work within a
range of -4° to +4°.
When the adjustment is over, turn off the vehicle,
remove the connection pipe and replace the four pro-
tective plugs.
Adjustment of carbon oxide rate (CO)
CO ADJUSTMENT IS NOT REQUIRED.
The system can correct its (stoichiometric) carburetion
through the Lambda probe control. This does not hap-
pen straightaway but depends on the Lambda probe
switching speed for a water temperature of 85 to 105 °C.
You will notice that, when the Lambda probe % con-
troller work slightly ABOVE ZERO, “Lambda sensor
adaptive gain 1” setting WILL INCREASE and will bring
the “Lambda sensor control 1 (%)” channel back to
about 0 ±3%.
You will notice that, when the Lambda probe % con-
troller work slightly BELOW ZERO, “Lambda sensor
adaptive gain 1” setting WILL DECREASE and will
bring the “Lambda sensor control 1 (%)” channel back
to about 0 ±3%.
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