TM 5-3805-293-23-1
0011
Table 1. Engine Troubleshooting Procedures for the 120M Motor Grader - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
N OT E
15. Excessive White Smoke
Some white smoke may be present during cold start-up conditions
when the engine is operating normally. If the white smoke persists,
there may be a fault.
1. Connect MSD (WP 0006).
2. Select Engine ECM C6.6 120M
Active Event or Diagnostic Codes
Found - Troubleshoot any active
and check for any active event or
codes before continuing with this
diagnostic fault codes.
procedure (WP 0010).
3. Remove water temperature regu-
Water Temperature Regulator
Obstructed or Stuck Open - Replace
lator (WP 0081). Inspect water
temperature regulator for obstruc-
water temperature regulator (WP
tion and for being stuck open.
0081).
Water Temperature Regulator OK -
Install water temperature regulator
(WP 0081).
N OT E
Fuel with a low cetane value is likely to cause white smoke.
4. Perform Fuel Quality Test (WP
Fuel System is Contaminated -
0035).
Drain fuel (WP 0229), replace primary
fuel filter (WP 0174), replace
secondary fuel filter (WP 0073), and
fill with correct fuel (TM 5-3805-293-
10) for machine operation.
5. Check the valve lash. Refer to
Out of Adjustment - Adjust engine
Systems Operation, Testing and
valve lash (WP 0032).
Adjusting, Engine Valve Lash
Adjustment (WP 0032).
6. Perform Engine Cylinder Cutout
Diagnostic Code Active During
Test - Proceed to (WP 0010) for trou-
Test (WP 0035).
bleshooting.
Injector Diagnostic Codes are Not
Active or Logged - Fault may be
engine mechanical related. Refer to
Engine Misfires, Runs Rough, or is
Unstable in this work package.
N OT E
16. Intermittent Engine
Shutdown
Use this procedure only if engine shuts down completely and must be
restarted.
1. Connect MSD (WP 0006). Select
Active Event or Diagnostic Codes
Engine ECM C6.6 120M and
Found - Troubleshoot any active
check for any active event or
codes before continuing with this
diagnostic fault codes.
procedure (WP 0010).
Change 1