198 5 HARD START AND NO START DIAGNOSTICS
4. Select Key-On Engine-Off Tests from the drop
down menu.
5. From the KOEO Diagnostics menu, select Glow
Plug/Inlet Air Heater, then select Run to start the
test.
6. Use the DMM and Am p Clamp to m easure
amperage. Record results on Diagnostic Form.
7. Repeat the above procedure for other feed wire
circuit. Record results on Diagnos tic Form .
• If amperage draw for both circuits meets
specifications, do not continue with test. The
Inlet Air Heater system is working correctly.
• If both circuits are not operational, confirm
that the ECM is programmed and enabled for
the Inlet Air Heater.
• When a failed circuit ha s been identified,
check that circuit only.
• If amperage draw does not meet
specification, continue with test 15.2 –
Voltage at Element.
15.2 – Voltage at Element Terminal
WARNING: To avoid serious personal injury
,
possible death, or damage to the engine
or
vehicle, read all safety instruction
sinthe“Safety
Information” section of this manual
.
Figure 251 Element terminal
1. Connect DMM positive lead to the element
terminal that is out of specification.
Figure 252 Ground terminal (left side of
crankcase)
2. Connect DMM negative lead to the ground
terminal.
3. Turn the ignition s witch to ON.
Figure 253 Inlet Air Heater Output State Test
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any proced ures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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