TM 5-3805-293-23-1
0011
Table 1. Engine Troubleshooting Procedures for the 120M Motor Grader - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
If ECMs will not communicate with
7. One or More ECMs Will
2. Connect MSD to machine (WP
MSD, program ECM, refer to ECM
Not Communicate With
0006). Check for communication
Programming (WP 0008).
Each Other - Continued
with ECMs:
a. Engine
b. AWD
c.
Implement 1
d. Implement 2
e. Transmission
8. Engine Cranks But Will
1. Check for the proper level of fuel,
Fluid Level Incorrect - Add fluids as
Not Start
oil and coolant (TM 5-3805-293-
needed.
10).
2. Inspect air inlet system for dam-
Air Inlet System is Blocked or Dirty
age, blockage, and cleanliness
- Clean and remove blockage from air
(WP 0037).
inlet system components (WP 0037).
Air Inlet System Components are
Damaged - Replace damaged
components (WP 0115, WP 0078, and
WP 0103).
3. Inspect exhaust system for dam-
Exhaust System is Blocked -
age and blockage (WP 0037).
Remove blockage (WP 0037).
Exhaust System Components are
Damaged - Replace damaged
components (WP 0077, WP 0076,
WP 0063, and WP 0079).
4. Perform Battery Test (WP 0040).
Battery Fails Battery Test - Replace
defective battery (WP 0194).
5. Check for white smoke from
White Smoke Present While Crank-
ing Engine - Perform Engine Com-
exhaust while cranking engine
pression Test (WP 0032).
(TM 5-3805-293-10).
Engine Fails Compression Test -
Replace engine (WP 0069).
Active Diagnostic Code -
6. Connect the MSD (WP 0006).
Troubleshoot diagnostic codes (WP
Select Engine ECM C6.6 120M
and check for any active
diagnostic codes.
7. Perform Fuel System Inspection
Fuel Rail Lines Leaking - Replace
(WP 0035).
fuel rail lines (WP 0072).
Low Pressure Fuel Lines Leaking -
Tighten lines (WP 0173).
Low Pressure Fuel Lines
Restricted/Damaged - Replace low
pressure fuel line (WP 0173).
0011-8
