TM 5-3805-294-23-1
0124
Table 1. Engine Control Unit (ECU) Does Not Communicate With Service Advisor - Continued.
Test or Inspection
Corrective Action
Malfunction
Visually inspect DIAG 5A F18
1.
If damaged or has loose
13.
DIAG 5A F18 Fuse
fuse sockets for damage or
sockets, replace cab wiring
Sockets Are
loose sockets. (Volume 5,
harness. (Volume 4,
Damaged or Are
Loose.
WP 0800, Figure 163)
WP 0504) Restore machine to
original condition.
2.
If not damaged and does not
have loose sockets, proceed to
Malfunction 14.
1.
Turn key switch to ON position,
14.
22 - 28 Volts Not
but DO NOT START ENGINE
Present Between
(TM 5-3805-294-10). (Volume
DIAG 5A F18 Fuse
Socket 1 and
5, WP 0794)
Ground.
2.
Measure voltage (Volume 3,
WP 0369) between DIAG 5A
F18 fuse socket 1 (Volume 5,
WP 0800, Figure 163) and a
known good ground. Note
reading.
3.
Turn key switch to OFF
1.
If between 22 -28 volts,
position (TM 5-3805-294-10).
proceed to Malfunction 15.
(Volume 5, WP 0794)
2.
If not between 22 - 28 volts,
restore machine to original
condition. Discontinue this
troubleshooting procedure and
perform All 24 VDC Circuits Do
Not Operate. (Volume 2,
WP 0169)
Visually inspect connector X1
1.
If damaged or has loose
15.
Connector X1
for damage or loose sockets.
sockets, replace machine
Damaged or Has
wiring harness. (Volume 4,
Loose Sockets.
(Volume 5, WP 0800, Figure
144)
WP 0516) Restore machine to
original condition.
If not damaged or does not
2.
have loose sockets, proceed to
Malfunction 16.
Measure resistance (Volume
1.
If continuity is present,
16.
Open Circuit
proceed to Malfunction 17.
Between Connector
3, WP 0369) between
X1 Socket A and
connector X1 socket A
2.
If continuity is not present,
Ground.
(Volume 5, WP 0800, Figure
replace machine wiring
144) and a known good
harness. (Volume 4,
ground. Note reading.
WP 0516) Restore machine to
original condition.
0124-5