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
1797-03 Fuel Rail Pressure
Sensor Voltage Above Nor-
Wait at least 30 seconds in order for diagnostic codes to become active.
mal - Continued
10. Using the MSD (WP 0006), select
1797-03 Remains Active - Proceed
Engine ECM C6.6 120M and
to Test Step 2.
check if diagnostic code 1797-04
1797-04 Becomes Active - Engine
is active.
ECM and return circuit test OK, fuel
rail pressure sensor is faulty. Replace
fuel rail pressure sensor (WP 0111).
11. Turn the ignition switch and
battery disconnect switch to the
OFF position.
12. Remove jumper wire from
harness connector EA-C6 (WP
0009, Figure 25), terminal 3, and
ground.
13. Disconnect engine ECM harness
connector EA-C1 (WP 0009, Fig-
ure 3) from Engine ECM J2.
14. Using a digital multimeter, test for
Continuity - Engine control wiring
continuity between engine ECM
harness is shorted, replace engine
harness connector EA-C1 (WP
control wiring harness (WP 0080).
0009, Figure 3) terminal 51, and
No Continuity - Proceed to step 15.
all other terminals.
There should be no continuity.
15. Using a digital multimeter, test for
No Continuity - Engine control wiring
continuity between engine ECM
harness is open, replace engine
harness connector EA-C1 (WP
control wiring harness (WP 0080).
0009, Figure 3) terminal 51, and
Continuity - (Resistance should be
fuel rail pressure sensor harness
less than 5.0 Ohms) - ECM faulty,
connector EA-C6 (WP 0009, Fig-
replace Engine ECM (WP 0067).
ure 25) terminal 3.
Connect the fuel rail pressure sensor
There should be good continuity.
EA-C6 (WP 0009, Figure 25) harness
connector.
Test Step 2. Test Return Circuit.
1. Turn the ignition switch and bat-
tery disconnect switch to the OFF
position.
2. Remove jumper wire from har-
ness connector EA-C6 (WP 0009,
Figure 25) terminal 2 and terminal
3.
3. Disconnect engine ECM harness
connector EA-C1 (WP 0009, Fig-
ure 3).
0011-168
