TM 5-3805-298-23-1
0120
Table 1. Air Conditioning (A/C) Compressor Will Not Engage - Continued.
0120
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. Using digital multimeter
Voltage 18 to 26 V Replace
Air Conditioning (A/C)
(WP 0174), test for voltage
compressor (WP 0406).
Compressor Will Not
between connector EN-C10
Engage - Continued
Proceed to Test Step 14.
(WP 0012, Figure 122) terminal 1
Voltage Less Than 18 V Proceed to
and terminal 2.
Test Step 3.
Test Step 3. Test for Open Wiring
Harness.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-298-10).
2. Remove right lower cab access
panels (WP 0347).
3. Disconnect connector EN-C2
(WP 0012, Figure 12) from
connector C-C18 (WP 0012,
Figure 13).
4. Install a jumper wire between
terminal 1 and terminal 2 of
connector EN-C10 (WP 0012,
Figure 122).
5. Using digital multimeter
Resistance 5.0 Ohms or Less
(WP 0174), measure resistance
Proceed to Test Step 5.
between connector EN-C2
Resistance Greater Than 5.0 Ohms
(WP 0012, Figure 12) terminal 6
Proceed to Test Step 4.
and terminal 7.
Test Step 4. Test for Faulty High
Pressure Switch.
1. Disconnect connector EN-C13
(WP 0012, Figure 125) from A/C
high pressure switch (WP 0012,
Figure 126).
2. Using digital multimeter
Resistance 5.0 Ohms or Less
(WP 0174), measure resistance
Replace engine wiring harness
between A/C high pressure switch
(WP 0299).
(WP 0012, Figure 126) terminal A
Proceed to Test Step 14.
and terminal B.
Resistance Greater Than 5.0 Ohms
Replace A/C high pressure switch
(WP 0414).
Proceed to Test Step 14.
Test Step 5. Test Ground Circuit for
Open.
Using digital multimeter (WP 0174),
Resistance 5.0 Ohms or Less
measure resistance between connector
Proceed to Test Step 6.
C-C18 (WP 0012, Figure 13) terminal 7
Resistance Greater Than 5.0 Ohms
and terminal 17.
Proceed to Test Step 7.
0120-3
