TK 61555-2-MM-EN
37
Air Heater
The air heater is mounted on the open end of the intake manifold. It heats the intake air to help
the engine start in cold weather. The air heater is energized by the microprocessor during
preheat, just before the engine is started.
The heater is probably defective if the resistance is more than 0.2 ohms and the current draw is
less than 60 amps, or if the current draw is more than 100 amps.
Check the resistance of the air intake heater with an ohmmeter between the M6 terminal on the
front of the heater and the screw on the back of the heater (or the heater case). The resistance
should be 0.14 ± 0.02 ohms.
Check the current draw of the heater with a clamp-on ammeter at the H1 wire near the M6
terminal on the front of the heater. During preheat the current draw should be approximately 70
amps.
Figure 9. Air Heater
1.
M6 Terminal
Wire Harness Routing
Do not change the factory routing of the wire harnesses inside the unit.
Low Voltage Disconnect Switch (LVD)
General Information
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All SLXi trailer units come fitted as standard from factory with a Low Voltage Disconnect (LVD)
Switch to accommodate for 3rd party device connections. The LVD switch ensures that all SLXi
units provide a dedicated device connection point for external devices, while also preventing
battery discharge/depletion of the EON battery during unit idle periods.
This new LVD switch replaces the previous optional aftermarket solution, the battery safeguard.
Example of “external devices” which are required to be powered through the LVD switch
connection points include:
•
Third party telematics
•
TouchPrint printer
•
TouchPrint dataloggers
