TM 5-3805-293-23-1
0011
Table 1. Engine Troubleshooting Procedures for the 120M Motor Grader - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Readings Do Not Match - Replace
6. Coolant Temperature is
4. Connect MSD (WP 0006).
instrument panel (WP 0276).
Too High - Continued
a. Select Engine ECM (C6.6
Readings Match - Check for any
120 m)
active event or diagnostic fault codes
b. Select Engine ECM (C6.6
120 m)
c.
Select status icon (WP 0006).
d. Start and run engine (TM 5-
3805-293-10).
e. Select status group #2 on left
of screen.
f.
Monitor engine coolant tem-
perature on right side of
screen.
g. Compare the reading for the
coolant temperature from the
MSD to the reading for the
coolant temperature from the
messenger.
a. Clean or dry harness
7. One or More ECMs Will
1. Visually inspect harness connec-
connectors.
Not Communicate With
tors for dirt, moisture and corro-
b. Engine ECM harness connec-
Each Other
sion at the following ECMs:
tors are corroded replace
Engine (WP 0067)
affected harness: Engine
AWD (WP 0270)
Control Wiring Harness (WP
Implement 1 (WP 0268)
0080), Rear Chassis Wiring
Implement 2 (WP 0268)
Harness (WP 0189).
Transmission (WP 0137)
c.
Transmission ECM harness
connectors are corroded
replace Rear Chassis Wiring
Harness (WP 0189).
d. AWD harness connectors are
corroded, replace Cab Lower
Harness (WP 0266).
e. Implement 1 ECM harness
connectors are corroded,
replace Cab Lower Harness
(WP 0266).
f.
Implement 2 harness connec-
tors are corroded, replace
Cab Lower Harness (WP
0266).
Change 1
