TM 5-3805-281-24-1
Tests
NOTE: The reading displayed on the laptop computer for
"2 EC angle" is the feedback signal from the
engine control sensor to the engine and pump
controller. See the specification chart above for
typical readings for fast idle, slow idle, E mode,
HP mode, and auto-idle mode. The readings can
vary from machine to machine. What to look for is
that the readings change when the engine rpm
dial is turned, and the E mode, HP mode, or
auto-idle mode is actuated. The readings indicates
engine control sensor is OK. (For circuit operation,
see Engine Speed Control System Operation in
Group 9010-05.)
IMPORTANT: Turn key switch off before
disconnecting any electrical
connectors. Disconnecting electrical
connectors while engine is running or
with key switch on can damage engine
and pump controller or other electrical
components.
1. Stop engine. Turn key switch to OFF.
IMPORTANT: Retainer tab on male half of wiring
harness connector halves must be
pushed down before pulling halves
9025
apart. Never pull on wiring leads
25
54
2. Push retainer tab down then pull connector halves
apart.
3. Measure resistance between the ground (A) and power
(C) terminals of EC sensor. If resistance is to
specification, go to next step. If resistance is not as
specified, replace engine control motor.
Engine Control (EC) Sensor--Specification
Resistance ....................................................... 2000 400 ohms between
ground and power terminals
NOTE: EC sensor is on the inside of EC motor housing.
4. When using a volt meter, install test harness in series
with wiring harness for EC sensor (E). Connect volt
meter.
Continued on next page
CED,TX08227,3028
1918MAR982/3
6-201
