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
2770-04 Throttle Hold
3. Using a digital multimeter, test for
Continuity - Cab lower wiring
Resume/Decel Switch Volt-
continuity at the harness connec-
harness is shorted to ground, replace
age Below Normal - Contin-
tor FA-C17 (WP 0009, Figure 14)
cab lower wiring harness (WP 0266).
ued
terminal 49 and ground. There
Connect connector FA-C17 (WP
should be no continuity.
0009, Figure 14) to Engine ECM con-
nector J1.
No Continuity - ECM faulty, replace
Engine ECM (WP 0067).
Remove jumper wire from PE-C8 (WP
0009, Figure 50) terminal 3 and
machine ground.
Install RH joystick (WP 0283).
2771-03 Throttle Hold Set/
System Response:
Accel Switch Above Normal
A warning will appear on display on
instrument panel. ECM logs diagnos-
tic code. Diagnostic codes can be
viewed on electronic service tool.
Possible Performance Effect:
"Throttle Hold" will be disabled by
ECM.
N OT E
The throttle lock feature is activated through the use of the throttle lock
switch and the "throttle lock set/accel switch" in order to maintain a
desired engine speed. The throttle lock switch is a three-position rocker
switch that is used to select the mode of operation. The throttle lock
feature has the following three modes of operation: Automatic mode,
Manual mode, and OFF.
Depress the throttle lock switch in the forward direction to the AUTO
position in order to select the automatic mode. Use the throttle pedal to
achieve the desired engine speed and then depress the "throttle lock
set/accel switch" in the forward direction (SET/ACCEL) in order to set
the desired engine speed.
Acceleration: Moving the "throttle lock set/accel switch" in the forward
direction (SET/ACCEL) will increase the desired engine speed.
Momentarily bumping the "throttle lock set/accel switch" will increase
the desired engine speed by 100 rpm. Holding the "throttle lock set/
accel switch" for more than 250 milliseconds will increase the desired
engine speed at a rate of 700 rpm per second. Moving the throttle pedal
past the engine speed setpoint will increase the engine speed.
Releasing the throttle pedal will allow the engine speed to return to the
locked engine speed.
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