TM-9-2320-280-20-1
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 1 OF 3
JANUARY 1996
TM-9-2320-280-20-1 - Page 197 of 888
2-110
C1
KNOWN INFO
HARD COLD
STARTING
POSSIBLE PROBLEMS
COLD ADVANCE
CIRCUIT
GLOWPLUG CIRCUIT
FUEL SYSTEM
TM 9-2320-280-20-1
FUEL SYSTEM
DIAGNOSTIC FLOWCHART
TEST OPTIONS
1. STE/ICE-R Test 89,
(Page 2-750)
2. Multimeter
REASON FOR QUESTION
Need battery voltage to
energize cold advance
solenoid.
KNOWN INFO
POWER TO COLD
ADVANCE
SOLENOID
POSSIBLE PROBLEMS
COLD ADVANCE
CIRCUIT
GLOWPLUG CIRCUIT
FUEL SYSTEM
KNOWN INFO
COLD ADVANCE
CIRCUIT
OK
POSSIBLE PROBLEMS
GLOWPLUG CIRCUIT
FUEL SYSTEM
TEST OPTIONS
Perform checks at right
(Page 2-111)
REASON FOR QUESTION
Cold advance circuit can
cause hard cold starting.
TEST OPTIONS
Fuel system tests
REASON FOR TESTS
The glowplug circuit operates
during cold start.
C3
C2
NO
YES
Go to M
Page 2-130
C
From 3,
Page 2-96
Disconnect wire 569B/569D
from cold advance solenoid.
With rotary switch in “RUN”
position, is there battery voltage
at wire 569B/569D?
Reconnect wire 569B/569D. Is
the cold advance circuit
working?
Perform Glowplug Tests, Page
2-303.
If no faults found, continue fuel
system tests.
NO
YES
Notify DS
Maintenance
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