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
2.
Using a digital multimeter, mea-
Voltage Less Than 18 - 24 Volts -
Switch Data Erratic, Intermit-
sure for voltage between harness
Proceed to step 3.
tent, or Incorrect - Contin-
connector A-C9 (WP 0009, Figure
Voltage Within 18 - 24 Volts -
ued
30) terminal 1 and terminal 2
Replace throttle lock switch (WP
ground.
0275).
Voltage should be 18-24 Volts DC.
3. Disconnect connector R-C1 (WP
0009, Figure 33) from connector
P-C3 (WP 0009, Figure 34).
4. Using a digital multimeter, mea-
Voltage Less Than 18 - 24 Volts -
sure for voltage between harness
Proceed to step 9.
connector P-C3 (WP 0009, Figure
Voltage Within 18 - 24 Volts - Pro-
34) terminal 46 and terminal 17
ceed to step 5.
ground.
Voltage should be 18-24 Volts DC.
5. Turn the ignition switch and bat-
tery disconnect switch to the OFF
position.
6. Disconnect connector A-C1 (WP
0009, Figure 31) from connector
R-C2 (WP 0009, Figure 32).
7. Install a jumper wire between har-
ness connector A-C1 (WP 0009,
Figure 31) terminals 1 and 2.
8. Using a digital multimeter, test for
Continuity - (Resistance should be
continuity at the harness connec-
less than 5.0 Ohms) - Cab upper
tor A-C9 (WP 0009, Figure 30)
wiring harness is open, replace cab
terminal 1 and terminal 2. There
upper wiring harness (WP 0265).
should be continuity.
No Continuity - Switch panel wiring
harness is open, replace switch panel
wiring harness (WP 0265).
9. Remove rear bulkhead cover
plate (WP 0266) and disconnect
connector P-C71 (WP 0009, Fig-
ure 18) from connector FA-C23
(WP 0009, Figure 17).
10. Using a digital multimeter, mea-
Voltage Less Than 18 - 24 Volts -
sure for voltage between harness
Proceed to step 11.
connector FA-C23 (WP 0009, Fig-
Voltage Within 18 - 24 Volts - Cab
ure 17) terminal 14 and terminal
lower wiring harness open, 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.
Change 1
0011-138
