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How to Begin Troubleshooting
Table 2-1. Vehicle Troubleshooting (Cont) - TM-9-2320-366-34-1_117
TM-9-2320-366-34-1 M1078 Series 2 1/2-Ton 4x4 Light Medium Tactical Vehicles (LMTV) Manual
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TM 9-2320-366-34-1
2-8. TROUBLESHOOTING INSTRUCTIONS (CONT)
Table 2-1. Vehicle Troubleshooting
Troubleshooting
Procedure
Malfunction
(Page)
a.
ENGINE SYSTEM TROUBLESHOOTING
a1.
Low Engine Oil Pressure
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
a2.
Engine Stalls at Low RPM
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
a3.
Engine Speed is Not Stable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
a4.
Engine Overspeeds on Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30
a5.
Too Much Vibration in Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32
a6.
Coolant in Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34
a7.
Excessive Engine Oil Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36
a8.
Engine Overheats
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40
a9.
Excessive Black or Gray
Exhaust
Smoke from Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44
a10.
White Exhaust Smoke From Engine
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48
a11.
Engine Starts but Misfires, Runs Rough, or Lacks Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52
a12.
Blue
Exhaust
Smoke from Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-62
a13.
Engine Cranks But Does Not Start
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66.2
a14.
Engine Does Not Crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66.6
a.1.
FUEL SYSTEM
TROUBLESHOOTING
a1.1.
Engine Cranks But Does Not Start
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66.8
b.
COOLING SYSTEM
TROUBLESHOOTING
b1.
Engine Overheats
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68
b2.
Loss of Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72
b3.
Oil in
Cooling System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74
c. TRANSMISSION SYSTEM TROUBLESHOOTING
c1.
WTEC II Transmission ECU Pushbutton Shift Selector (TEPSS) Displays Main Codes 22
Sub Codes 15 (Serial Number 6510032369 and Higher) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80
c2.
WTEC II Transmission ECU Pushbutton Shift Selector (TEPSS) Displays Main Codes 22
Sub Codes 15 (Prior to Serial Number 6510032369 With Transmission Adapter Cable
Assembly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-90
c3.
WTEC II Transmission ECU Pushbutton Shift Selector (TEPSS) Displays Main Codes 22
Sub Codes 15 (Prior to Serial Number 6510032369) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-104
c4.
WTEC II Transmission ECU Pushbutton Shift Selector (TEPSS) Displays Main Codes 22
Sub Codes 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-114
c5.
WTEC II Transmission ECU Pushbutton Shift Selector (TEPSS) Displays Main Codes 24
Sub Codes 12 or 23 (Serial Number 6510032369 and Higher)
. . . . . . . . . . . . . . . . . . . . . . . . .
2-122
c6.
WTEC II Transmission ECU Pushbutton Shift Selector (TEPSS) Displays Main Codes 24
Sub Codes 12 or 23 (Prior to Serial Number 6510032369 With Transmission Adapter
Cable Assembly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-130
c7.
WTEC II Transmission ECU Pushbutton Shift Selector (TEPSS) Displays Main Codes 24
Sub Codes 12 or 23 (Prior to Serial Number 6510032369) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-142
2-8
Change 1
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