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
1797-04 Fuel Rail Pressure
10. Using a digital multimeter, test for
Continuity - Engine control wiring
Sensor Voltage Below Nor-
continuity between engine ECM
harness is shorted, replace engine
mal - Continued
harness connector EA-C1 (WP
control wiring harness (WP 0080).
0009, Figure 3) terminal 51, and
No Continuity - Proceed to step 11.
all other terminals, and ground.
There should be no continuity.
11. Using a digital multimeter, test for
Continuity - (Resistance should be
continuity between engine ECM
less than 5.0 Ohms) - Engine ECM
harness connector EA-C1 (WP
faulty, replace Engine ECM (WP
0009, Figure 3) terminal 51 and
0067).
harness connector EA-C6 (WP
Connect the fuel rail pressure sensor
0009, Figure 25) terminal 3.
EA-C6 (WP 0009, Figure 25) harness
connector.
There should be good continuity.
No Continuity - Engine control wiring
harness is open, replace engine con-
trol wiring harness (WP 0080).
Test Step 2. Test 5-Volt Circuit.
1. Install a jumper wire between fuel
rail pressure sensor harness
connector EA-C6 (WP 0009,
Figure 25) terminal 1 and terminal
2.
N OT E
Wait at least 30 seconds in order for diagnostic codes to become active.
2. Turn the ignition switch and bat-
tery disconnect switch to the OFF
position.
3. Disconnect engine ECM harness
connector EA-C1 (WP 0009, Fig-
ure 3) from Engine ECM J2.
4. Using a digital multimeter, test for
Continuity - (Resistance should be
continuity between engine ECM
less than 5.0 Ohms) - 5-Volt supply
harness connector EA-C1 (WP
circuit tests OK. Engine ECM faulty,
0009, Figure 3) terminal 40 and
replace Engine ECM (WP 0067).
terminal 48.
Connect the fuel rail pressure sensor
EA-C6 (WP 0009, Figure 25) harness
There should be good continuity.
connector.
No Continuity - Engine control wiring
harness is open, replace engine con-
trol wiring harness (WP 0080).
Change 1
