TM 5-3805-293-23-1
0011
Table 2. Engine Troubleshooting with Codes for the 120M Motor Grader - Continued.
CDI FMI CODE
ERROR/EVENT
CORRECTIVE ACTION
1779-05 Fuel Rail #1 Pres-
14. Using a digital multimeter, test for
No Continuity - Engine control wiring
sure Valve Solenoid Current
continuity between fuel rail pump
harness is open between fuel rail
Below Normal - Continued
solenoid harness connector EA-
pump solenoid harness connector EA-
C2 (WP 0009, Figure 42) terminal
C2 and engine ECM harness
1 and Engine ECM harness con-
connector EA-C1. Replace engine
nector EA-C1 (WP 0009, Figure
control wiring harness (WP 0080).
3) terminal 25.
Continuity - Resistance should be
less than 5.0 Ohms - Proceed to Test
There should be good continuity.
Step 3.
Test Step 3. Test Solenoid Return
Circuit.
No Continuity - Engine control wiring
Using a digital multimeter, test for con-
harness is open between fuel rail
tinuity between fuel rail pump solenoid
pump solenoid harness connector EA-
harness connector EA-C2 (WP 0009,
C2 and Engine ECM harness
Figure 42) terminal 2 and Engine
connector EA-C1. Replace engine
ECM harness connector EA-C1 (WP
control wiring harness (WP 0080).
0009, Figure 3) terminal 26.
Continuity - Resistance should be
There should be good continuity.
less than 5.0 Ohms - ECM faulty,
replace Engine ECM (WP 0067).
Connect harness connector EA-C2
(WP 0009, Figure 42) to fuel rail pump
solenoid.
1779-06 Fuel Rail #1 Pres-
System Response:
sure Valve Solenoid Current
A warning will display on instrument
Above Normal
panel. ECM will log diagnostic code.
Possible Performance Effect:
An electrical fault may prevent pres-
surized fuel to fuel rail, and may result
in loss of fuel injection. If solenoid for
fuel rail pump fails, it is likely that fuel
will not be pumped into fuel rail.
Engine will stall or engine will not
start.
0011-155
Change 1
