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8
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12
62-11389
b. Check all connections for mechanical tightness. Be
sure filter outlet pipe is not fractured.
c. Release 2 clips on air cleaner housing and remove
the cover.
d. Remove filter element, wipe inside of air cleaner
housing clean inspect element and replace if re-
quired.
e. Wipe inside of the cover and re-install.
f. Re-secure 2 clips on air cleaner housing.
g. Reset air cleaner service indicator.
8.5.10 Intake Air Heater
The circuit amp draw for the air heater circuit is checked
during a Pretrip cycle. Refer to Section 2.12 for
amperage and resistance values.
a. Troubleshooting The Intake Air Heater (IAH)
1 Ensure the unit will not start automatically by dis-
abling any two way communication and placing the
Main Power switch in the OFF position. Disconnect
the high voltage source and lockout/tagout the re-
ceptacle.
2 Disconnect the lead.
3 Measure the resistance between the + terminal and
the heater body.
4 If the resistance is infinite or zero, the intake air heater
is faulty and must be replaced.
+ TERMINAL
HEATER BODY
Figure 8
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13 Intake Air Heater
b. Replacing The Intake Air Heater
1 Ensure the unit will not start automatically by dis-
abling any two way communication and placing the
Main Power switch in the OFF position. Disconnect
the high voltage source and lockout/tagout the re-
ceptacle.
2 Remove the inlet hose.
3 Disconnect the lead.
4 Remove the flange, intake air heater and gaskets.
NOTE
To avoid short-circuiting the heater, ensure that
the heater and the heater elements are vertical
when assembling to the intake manifold. The
plus terminal is to be mounted towards the front
of the unit.
5 Clean gasket surfaces and reinstall intake air heater
and flange using new gaskets. Torque flange bolts to
11 to 18 ft/lbs (15 to 24 nm).
FSA
ENSSN
LED
ENSCU
The ENSCU is located on the air cleaner
bracket - see item 4,Figure 2
−
3)
Figure 8
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14 Electronic Speed Control
Components
8.5.11 Speed Control System
Engine speed is controlled by three components: the
engine speed control unit (ENSCU), the fuel/speed
actuator (FSA) and the engine speed sensor (ENSSN).
The ENSSN provides the speed signal to the ENSCU.
The ENSCU starts, stops and controls the speed of the
engine by varying the position of the FSA rod. It also
provides a speed signal to the microprocessor.
The FSA combines the fuel shutoff solenoid and speed
control solenoid into one component.
The ENSCU is fitted with an alarm LED which may be
used to diagnose failures within the system. Refer to
Section 10 for wiring schematic and to Section 9.5 for
Speed Control System Diagnostics.