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 1199 of 1313
TWO PRESSURE MODES INDICATED WITH STEADY MODE LIGHTS - Continued
STEP
21.
IS THERE 4.75 to 5.25 VDC PRESENT AT PRESSURE TRANSDUCER?
a.
Refer to point to point schematics.
CAUTION
Turn battery switch to OFF position before disconnecting or connecting ECU wiring
harness. Failure to do so may result in damage to ECU.
b.
Turn battery switch to OFF position.
c.
Connect CTIS wiring harness cannon plug at ECU.
T0982DAA
PRESSURE
TRANSDUCER
Figure 19.
Pressure Transducer.
d.
Disconnect CTIS wiring harness electrical lead from pressure transducer.
e.
Turn battery switch to ON position.
f.
Connect multimeter red lead to wire at pressure transducer.
g.
Connect multimeter black lead to a known good ground.
h.
Meter reading should be between 4.75 and 5.25 VDC.
CONDITION/INDICATION
IS THERE 4.75 to 5.25 VDC PRESENT AT PRESSURE TRANSDUCER?
DECISION
YES - Replace pressure transducer (Volume 5, WP
0812). Go to Step (23) to verify problem is solved.
NO - Go to Step (22).
TM 9-2320-272-23-1
0144
0144-22
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