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
0549-02 Throttle Lock
10.
Using a digital multimeter, mea-
Voltage Less Than 18 - 24 Volts
Switch Data Erratic, Intermit-
sure for voltage between harness
Proceed to step 11.
tent, or Incorrect - Contin-
connector FA-C23 (WP 0009, Fig-
Voltage Within 18 - 24 Volts - Cab
ued
ure 17) terminal 23 and terminal
lower wiring harness shorted, replace
20 ground.
cab lower wiring harness (WP 0266).
Voltage should be 18-24 volts DC.
Connect harness connector A-C9
(WP 0009, Figure 30) to throttle hold
mode switch.
11. Turn the ignition switch and bat-
tery disconnect switch to the OFF
position.
12. Disconnect connector FA-C17
(WP 0009, Figure 14) from
Engine ECM connector J1.
13. Using a digital multimeter, test for
Continuity - Rear chassis wiring
continuity between the harness
harness is shorted, replace rear
connector FA-C17 (WP 0009, Fig-
chassis wiring harness (WP 0189).
ure 14) terminal 52 and all other
Connect connector R-C1 (WP 0009,
terminals. There should be no
Figure 33) to connector P-C3 (WP
continuity.
0009, Figure 34).
Connect harness connector A-C9
(WP 0009, Figure 30) to throttle hold
mode switch.
No Continuity - ECM faulty, replace
engine ECM (WP 0067).
Connect connector R-C1 (WP 0009,
Figure 33) to connector P-C3 (WP
0009, Figure 34).
Connect harness connector A-C9
(WP 0009, Figure 30) to throttle hold
mode switch.
Test Step 3. Throttle Lock Switch
Manual Position Grounded.
1. Disconnect harness connector A-
C9 (WP 0009, Figure 30) from
throttle lock switch.
2. Using a digital multimeter, mea-
Voltage Less Than 18 - 24 Volts -
sure for voltage between harness
Proceed to step 3.
connector A-C9 (WP 0009, Figure
Voltage Within 18 - 24 Volts -
30) terminal 1 and terminal 2
Replace throttle lock switch (WP
ground.
0275).
Voltage should be 18-24 Volts DC.
Change 1
0011-132
