25
- 2 EMISSION CONTROL SYSTEMS
•
AIR
INTAKE HEATER
RELAYS-DIESEL
ENGINE
The engine controller
operates
the air intake
heat-
ers through the air intake
heater
relays. The relays
are energized before cranking if the charge air tem-
perature
sensor
input to the engine controller
indi-
cates
air temperature is 16°C
(60°F)
or below. When
the
ignition
key is turned to the ON position the so-
lenoids
will
make a
clicking
noise
indicating
they are
energized. Refer to Group 14 in this supplement for
Air
Intake Heater Relay operation.
Fig.
4 Air
Intake Heaters
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