TM 5-2410-240-23-1
0021
Table 1. Cab Troubleshooting Without Codes. - Continued.
0021
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Little or No Warm Air Flow When
Test Step 6.
Heater Control Knob is Set for
1. Turn ignition switch and bat-
Maximum Heating Continued
tery disconnect switch to OFF
position (TM 5-2410-240-10).
2. Disconnect harness connec-
tor AC-C3 (WP 0018,
Figure 3) from HVAC water
control valve.
3. Turn battery disconnect switch
and ignition switch to ON posi-
tion (TM 5-2410-240-10).
4. Using digital multimeter, mea-
Voltage Between 12 and 14
sure for voltage (WP 0283)
Volts - Proceed to step 5.
between harness connector
Voltage Not Found - Proceed to
AC-C3 (WP 0018, Figure 3)
Test Step 7.
terminal 1 and terminal 4.
5. Turn ignition switch and bat-
tery disconnect switch to OFF
position (TM 5-2410-240-10).
6. Disconnect harness connec-
tor PL-C5 (WP 0018, Figure
218) from equipment ECM J2.
7. Using digital multimeter, test
No Continuity - Proceed to Test
for continuity (WP 0283)
Step 8.
between harness connector
Continuity - Replace water valve
AC-C3 (WP 0018, Figure 3)
actuator (WP 0245). Ensure all
terminal 2 and harness con-
harness connectors are recon-
nector PL-C5 (WP 0018, Fig-
nected. Verify proper operation of
ure 218) terminal 21.
machine (TM 5-2410-240-10).
Test Step 7.
1. Disconnect harness connec-
tor C-C16 (WP 0018, Figure
24) from 24 to 12 volt con-
verter.
2. Turn battery disconnect switch
and ignition switch to ON posi-
tion (TM 5-2410-240-10).
Voltage Found - Proceed to Test
3. Using digital multimeter, mea-
sure voltage (WP 0283) of
Step 8.
24 volt supply at harness con-
No Voltage Found - Proceed to
nector C-C16 (WP 0018, Fig-
step 4.
ure 24) terminal 2 and 3.
There should be approximately 24
volts 0.5 volts.
0021-4
