TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 1260 of 1313
CONTROL PANEL LIGHTS WORK, SYSTEM FAILS TO INFLATE OR DEFLATE - Continued
e.
Set multimeter to measure resistance.
f.
Connect multimeter red lead to connector from pneumatic controller.
g.
Connect multimeter black lead to CTIS wiring harness cannon plug.
h.
Meter reading should be less than 200 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN PNEUMATIC CONTROLLER SOLENOIDS AND CTIS WIRING
HARNESS CANNON PLUG AT ECU?
DECISION
YES - Go to Step (6).
NO - Replace CTIS wiring harness (Volume 2, WP
0322). Go to Step (11) to verify problem is solved.
STEP
6.
IS THE PNEUMATIC CONTROLLER IN GOOD CONDITION?
Listen for clicking noise while changing CTIS mode.
T0901DAA
PNEUMATIC
CONTROLLER
(CAB)
Figure 5.
Pneumatic Controller.
CONDITION/INDICATION
IS THE PNEUMATIC CONTROLLER IN GOOD CONDITION?
DECISION
YES - Go to Step (7).
NO - Replace pneumatic controller (Volume 5, WP
0810). Go to Step (11) to verify problem is solved.
TM 9-2320-272-23-1
0149
0149-7
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