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-
2. Disconnect harness connector
sure Valve Solenoid Current
EA-C2 (WP 0009, Figure 42) from
Below Normal - Continued
fuel rail pump solenoid.
3. Install a jumper wire between fuel
rail pump solenoid harness con-
nector EA-C2 (WP 0009, Figure
42) terminal 1 and ground.
4. Turn ignition switch to the ON
position.
5. Perform Fuel Rail Pump Solenoid
1779-05 Remains Active - Proceed
Test (WP 0035) and check if diag-
to step 11.
nostic code 1779-06 becomes
1779-06 Becomes Active - ECM and
active.
control circuit tests OK, proceed to
step 6.
6. Turn ignition switch to the OFF
position.
7. Remove jumper wire from fuel rail
pump solenoid harness connector
EA-C2 (WP 0009, Figure 42) ter-
minal 1 and ground.
8. Install a jumper wire between fuel
rail pump solenoid harness
connector EA-C2 (WP 0009,
Figure 42) terminal 1 and
terminal 2.
9. Turn ignition switch to the ON
position.
10. Perform Fuel Rail Pump Solenoid
1779-05 Remains Active - Proceed
Test (WP 0035) and check if
to Test Step 3.
diagnostic code 1779-06
1779-06 Becomes Active - Fuel rail
becomes active.
pump solenoid faulty, replace fuel
injection pump (WP 0074).
11. Turn ignition switch and battery
disconnect switch to the OFF
position.
12. Remove jumper wire from fuel rail
pump solenoid harness connector
EA-C2 (WP 0009, Figure 42) ter-
minal 1 and ground.
13. Disconnect Engine ECM harness
connector EA-C1 (WP 0009, Fig-
ure 3) from Engine ECM J2.
0011-154