TM 5-3805-280-24-1
Diagnostic Information
DIAGNOSE ELECTRONIC AND CONTROL
VALVE COMPONENT MALFUNCTIONS
Engine Control Motor
Engine Control Sensor
(EC Motor)
(EC Sensor)
Engine rpm Dial
Operational Function
Move fuel injection pump lever.
Senses position of EC motor
Signal to EC motor to set target
engine speed.
Control Problem
Fuel injection pump lever does not
Loss of EC motor position sensing.
Speed does not change when
move
dial is turned.
Machine Symptoms
Turning engine rpm dial does not
Engine speeds slower than speed
Speed is held at 1600 rpm.
increase or decrease engine speed.
selected by engine rpm dial and E
(Auto-idle function operates and
mode switch. Cannot control speed.
engine stops by turning key
switch off.)
Laptop Computer with
--
01 Fault code is displayed
07 Fault code is displayed.
Excavator Diagnostic
Software Self-Diagnostic
Functions
Laptop Computer with
--
Monitor No. 2, EC angle. Typical
Monitor No. 13, Target Engine
Excavator Diagnostic
voltage for slow idle is 2.5 volts.
Speed.
Software Monitoring
Function
Harness Check
Install JT07065 Test Harness. Check
Install JT07066 Test Harness.
--
for control signal.
Typical voltage for slow idle is 2.5
volts.
Note
Engine stopped by fuel shut-off
If EC sensor has failed, engine
--
solenoid. If solenoid fails, engine
learning control does not work.
turns over but does not start.
Description of Operation
See Engine Speed Control System
See Engine Speed Learning Control
See Engine RPM Dial Speed
9025
Operation in Group 9010-05.
Circuit Operation in Group 9010-05.
Control Circuit Operation in
15
Group 9010-05.
2
Continued on next page
TX,15,GG2238
1913AUG981/10
6-91