SHOP MANUAL
Ch 6 page 46
ELECTRICAL SYSTEM
Quick warmup function
The quick warmup function is using the ZF retarder to add heat into transmission oil and engine coolant water.
The ZF software may need an upgrade to accept this feature.
The quick warmup is automatically activated when the following conditions are met:
Engine speed = 400..900rpm
Engine coolant temperature < 60/70°C
Charge air temperature < 15°C
Accelerator pedal = IDLE
Park brake = ENGAGED
Transmission and gear selector = NEUTRAL
No clutch calibration running
First accumulator charge after startup is finished
When all these criteria are met for at least 30 seconds the quick warmup will engage.
If any of the above criteria is violated the quick warmup will immediately be disabled.
When the quick warmup is active the engine coolant temperature will act as a hysteresis to enable/disable the
function keeping the coolant temperature between 60 to 70°C.
(A practical test starting at 0°C the coolant temperature reached 70°C in approx. 8 minutes)
Cooldown function
The cooldown function is implemented to protect the engine
turbo during shutdown of the machine.
A 3 minute timer is used for this purpose.
This timer is reset every time the following criteria are met:
Engine speed > 1000rpm and fan drive > 40%
or
Engine speed > 1000rpm and charge air pressure > 0.14bar
If the timer is still running at the time the ignition is turned off
the engine will continue to run.
The engine and other functions will automatically shut down
when the timer has reached 3 minutes.
The following functions are influenced when the cooldown is
activated:
Turn off Radio/CD, CB, Climate system and outside lights.
The engine will run at idle speed and the transmission will be
forced to neutral.
Park brake will be activated.
NOTE
Figure 22
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