TM 5-3805-293-23-1
0011
Table 1. Engine Troubleshooting Procedures for the 120M Motor Grader - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
16. Intermittent Engine
8. Check for air in fuel system Air In
Air Found in Fuel - Repair or replace
components as identified during air in
Shutdown - Continued
Fuel Test (WP 0035).
fuel test (WP 0035).
17. Intermittent Low Power
1. Connect MSD. Select Engine
Active Event or Diagnostic Codes
ECM C6.6 120M and check for
Found - Troubleshoot any active
or Power Cutout
any active event or diagnostic
codes before continuing with this
fault codes.
procedure (WP 0010).
2. Perform Fuel Quality Test (WP
Fuel System is Contaminated -
Drain fuel (WP 0229), replace primary
0035).
fuel filter (WP 0174), replace
secondary fuel filter (WP 0073), and
fill with correct fuel (TM 5-3805-293-
10) for machine operation.
3. Perform Fuel System Inspection
Fuel Rail Lines Leaking - Replace
fuel rail lines (WP 0072).
(WP 0035).
Low Pressure Fuel Lines Leaking -
Tighten lines (WP 0173).
Low Pressure Fuel Lines
Restricted/Damaged - Replace low
pressure fuel line (WP 0173).
Primary Fuel Filter and Water
Separator Damaged or
Contaminated - Replace primary fuel
filter and water separator (WP 0174).
Secondary Fuel Filter Damaged or
Contaminated - Replace secondary
fuel filter (WP 0073).
4. Verify that the low pressure fuel
Lines Loose or Not Secured -
Tighten lines and secure as needed
lines are tight and secured prop-
(WP 0173).
erly (WP 0173).
5. Check for air in fuel system Air in
Air Found in Fuel - Repair or replace
components as identified during air in
Fuel Test (WP 0035).
fuel test (WP 0035).
6. Inspect air inlet system for
Air Inlet System is Blocked or Dirty
- Clean and remove blockage from air
damage, blockage, and
inlet system components (WP 0037).
cleanliness (WP 0037).
Air Inlet System Components are
Damaged - Replace damaged
components (WP 0115, WP 0078, and
WP 0103).
7. Inspect exhaust system for
Exhaust System is Blocked -
Remove blockage (WP 0037).
damage and blockage (WP
0037).
Exhaust System Components are
Damaged - Replace damaged com-
ponents (WP 0077, WP 0076, WP
0063, and WP 0079).
Change 1
