Chrysler 1991 Service Manual Supplement page 145

25 - 2
EMISSION CONTROL SYSTEMS
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A I R 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 i f 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