TM 5-3805-291-23-1
TROUBLESHOOTING INTRODUCTION - CONTINUED
0004 00
EXPLANATION OF TROUBLESHOOTING TABLE COLUMNS
0004 00
The columns in troubleshooting Tables 1 thru 8 in WP 0008 00 and Tables 1 thru 15 in WP 0009 00 are defined as fol-
lows:
1.
MALFUNCTION. Indicates fault that has occurred in system/equipment.
INSPECTION OR TEST. Indicates inspection or test to be performed to isolate probable cause for fault symptom.
2.
CORRECTIVE ACTION. Indicates procedure to correct the problem.
3.
VISUAL INSPECTION OF AC SYSTEM
1.
Check condenser and evaporator.
a.
Check for any type of restriction that will obstruct air flow. Check for dirt, insects, plastic bags, etc.
b.
Check for restrictions. A clean condenser will lead to longer life for compressor.
2.
Clean fresh air filters and clean recirculation filters (TM 5-3805-291-10).
3.
Check for a loose belt on compressor (WP 0048 00).
4.
Check drain tube on evaporator. Drain plug should not be obstructed (WP 0227 00).
5.
Start machine. Set AC on HIGH (TM 5-3805-291-10). Feel accumulator with hand. In a properly charged system, entire
accumulator will be cooled or cold to touch.
0004 00
GENERAL INFORMATION
Glossary
1.
Active Diagnostic Code. An active diagnostic code describes a condition currently present in order to alert operator or
service technician of an electronic system malfunction. Refer to Diagnostic Code in this glossary.
2.
Alternating Current (ac). Alternating current is an electric current that reverses direction at a regular, recurring inter-
val.
3.
American Wire Gauge (AWG). AWG is a measure of electrical wire diameter. AWG is also a measure of electrical
wire current carrying capacity. When AWG number is smaller, diameter of wire is larger. When AWG number is larger,
diameter of wire is smaller.
4.
Before Top Center (BTC). BTC is 180 degrees of crankshaft rotation before piston reaches top center position in nor-
mal direction of rotation.
5.
Boost Pressure Sensor. Difference between turbocharger outlet pressure and atmospheric pressure is commonly
referred to as "boost".
6.
Breakout Harness. Breakout harness is a test harness designed to connect into vehicle harness or engine harness. This
connection allows a normal circuit operation and simultaneously provides a breakout T in order to measure signals.
7.
Bypass Circuit. A bypass circuit is a circuit used as a substitute circuit for an existing circuit. A bypass circuit is typi-
cally used as a test circuit.
8.
CAN Data Link. CAN data link is a serial communications port used for communication with other microprocessor-
based equipment. Also referred to as J1939 data link.
9.
CAT Data Link. CAT Data Link is a serial communication port used for communication with other microprocessor-
based equipment.
Code. Refer to Diagnostic Codes or Event Code in this glossary.
10.
11.
Cold Mode. Cold mode is a mode for cold starting and cold engine operation that includes retarded timing and raised
low idle. This mode is used for engine protection, reduced smoke emission, and faster warmup time.
12.
Communication Adaptor Tool. Communication adapter provides a communication link between ECM and ET.
13.
Component Identifier (CID). CID is a number that identifies specific electronic control system component that has
experienced a diagnostic code.
0004 00-3