FUSO 4M4 – FUEL AND ENGINE CONTROL – STRUCTURE AND OPERATION – Idle-up function

• The idle-up function increases the engine idling speed when a load is applied to the engine by other system (such as air conditioner) or when the warm-up acceleration function are activated.
Also, in the case of variable geometry turbocharger-equipped vehicles, idling speed can be increased with the lighting switch turned on as well.

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