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
N OT E
1779-06 Fuel Rail #1 Pres-
sure Valve Solenoid Current
Wait at least 30 seconds in order for diagnostic codes to become active.
Above Normal - Continued
5. Turn ignition switch and battery
disconnect switch to the OFF
position.
6. Disconnect Engine ECM harness
connector EA-C1 (WP 0009, Fig-
ure 3) from Engine ECM J2.
7. Using a digital multimeter, test for
No Continuity - Proceed to Test
continuity between engine ECM
Step 3.
harness connector EA-C1 (WP
Continuity - Engine control wiring
0009, Figure 3) terminal 25, all
harness is shorted, replace engine
other circuits, and ground.
control wiring harness (WP 0080).
There should be no continuity.
Test Step 3. Test Solenoid Return
Circuit.
Continuity - Engine control wiring
Using a digital multimeter, test for con-
harness return circuit is shorted,
tinuity between engine ECM harness
replace engine control wiring harness
connector EA-C1 (WP 0009, Figure 3)
terminal 26, and all other terminals,
(WP 0080).
and ground.
Continuity - ECM faulty, replace
There should be no continuity.
engine ECM (WP 0067).
Connect harness connector EA-C2
(WP 0009, Figure 42) to fuel rail pump
solenoid.
Change 1
