Section IV. TROUBLESHOOTING - TM-9-2320-279-20-10162

TM 9-2320-279-20-1

Section IV.

TROUBLESHOOTING

2-14. TROUBLESHOOTING INTRODUCTION. This section contains step by step procedures for

identifying, locating, isolating, and repairing equipment malfunctions.

2-15. TROUBLESHOOTING INSTRUCTIONS. The System Symptom Index (Table 2-7) lists common

malfunctions by vehicle system. The Troubleshooting Subject Index (Table 2-8) lists common malfunctions

alphabetically. The Troubleshooting Procedures (Table 2-9) lists each malfunction followed by tests,

inspections, and corrective actions. The Simplified Test Equipment for Internal Combustion Engines

(STE/ICE) (para 2-16) contains procedures for operating the STE/ICE system to check out, test, and

troubleshoot M977 series vehicle's internal combustion engines and associated fuel and electrical systems.

This manual cannot list all malfunctions that may occur, nor all tests, or inspections and corrective

actions. If a malfunction is not listed or is not corrected by listed corrective actions, notify the supervisor.

Before using troubleshooting tables, be sure all applicable Preventive Maintenance Checks and Services

(PMCS) have been performed. Perform tests, inspections, and corrective actions in the order listed. Try to

return the vehicle or component to operation after each test, inspection, and corrective action has been

performed.

Refer to the figures, foldouts, and publications listed below while doing troubleshooting. These figures,

foldouts, and additional publications will help isolate and locate troubles and get the vehicle back in service

as quickly as possible. Foldouts are found at the end of this volume.

Figure 2-2

Circuit Breakers

Figure 2-3

M985E1 HIGH IDLE Wiring Diagram

Figure 2-4

M984 HIGH IDLE Wiring Diagram

Figure 2-5

M984 HIGH IDLE Control Assembly

Figure 2-6

M985E1 HIGH IDLE Control Assembly

Figure 2-7

Winch Controller Wiring Diagram

Figure 2-8

Winch Controller Wiring Diagram

Figure 2-9

Remote Controller Electrical Schematic (M977, M985)

Figure 2-10

Remote Controller Wiring Diagram (M977, M985)

Figure 2-11

Tanker Component Identification

Figure 2-12

Tanker Fuel System Functional Diagram

Figure 2-13

Tanker Operation Functional Diagram

Figure 2-14

Tanker Fuel System Schematic

Figure 2-15

Arctic Heater Kit Wiring Diagram (Model A)

Figure 2-16

Arctic Heater Kit Wiring Diagram (Model B)

Figure 2-16.1 Arctic Heater Kit Wiring Diagram (Model B)

Figure 2-16.2 Arctic Heater Fault Codes (Model B)

Figure 2-16.3 Arctic Heater Kit Wiring Diagram (Model B)

Figure 2-17

STE/ICE Vehicle Test

Figure 2-18

Relationship of GO, NO-GO Tests

Figure 2-19

STE/ICE System

Figure 2-20

VTM Controls and Readout Display

Figure 2-21

Cable Assemblies

Figure 2-22

Connector Key Location

Figure 2-23

Transducer Kit

Foldout 1

Electric Diagram

Foldout 2

Air Schematic

Foldout 3

Hydraulic Schematic

TM 9-2320-279-10, Operator's Manual for M977 Series Vehicles

LO 9-2320-279-12, Lubrication Order for M977 Series Vehicles

FM 10-71, Petroleum Tank Vehicle Operations

TM 9-6140-200-14, Operator's Organization, Direct Support, and General Support Maintenance

Manual for Lead-Acid Storage Batteries

TM 750-254, Cooling Systems: Tactical Vehicles

TM 9-214, Inspection, Care and Maintenance of Antifriction Bearings

FM 55-506-1, Basic Electricity

DA Pamphlet 750-33, Charging System Troubleshooting

2-50

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