TM 5-3805-290-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 2. Electrical System Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. Check coupler valve circuits.
1. If continuity is present for all circuits,
15. Quick Coupler Switch is
(a) Wiring harness remains
temporarily replace coupler switch
Inoperative - Continued.
disconnected from coupler switch.
(WP 0049 00). If problem still exists,
(b) Battery disconnect switch remains
replace coupler valve (WP 0190 00).
in ON position (TM 5-3805-290- 2. If continuity is not present for all
10).
circuits, there is an open circuit
(c) Disconnect wiring harness from
between coupler switch and coupler
coupler valve (WP 0190 00).
valve. Replace wiring harness in
(d) Check continuity at coupler switch
question (WP 0169 00 thru WP 0175
between wiring harness pin 1,
00).
circuit 779 (WH) and coupler
solenoid wiring harness pin 1,
circuit 779 (WH).
(e) Check continuity at coupler switch
between wiring harness pin 3,
circuit 780 (PU) and coupler
solenoid wiring harness pin 4,
circuit 780 (PU).
(f) Check continuity at coupler switch
between wiring harness pin 4,
circuit 927 (BU) and coupler
solenoid wiring harness pin 2,
circuit 927 (BU).
(g) Check continuity at coupler switch
between wiring harness pin 6,
circuit 739 (YL) and coupler
solenoid wiring harness pin 3,
circuit 739 (YL).
1. Check defroster fuse (WP 0054 00).
1. If fuse is open, replace it.
16. Rear Defroster is
2. If fuse is OK, go to Test 2.
Inoperative or Always On.
2. Use MSD equipped with ET software
1. If machine ECM defroster switch
to monitor defroster switch status.
status indicates switch is always closed
(a) Turn battery disconnect switch
or always open, go to Test 3.
and engine start switch to ON
2. If machine ECM defroster switch
position (TM 5-3805-290-10).
status indicates switch is changing
(b) Press defroster switch repeatedly
status normally, go to Test 4.
while watching for status change
on MSD.
