Daewoo POLUS P126TI Operation Manual page 168

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UNSATISFACTORY PERFORMANCE
If the governing system functions poorly, perform the following tests.
Symptom
Engine over-
1. Do not crank. Apply DC power to the
speeds
governor system
2. Manually hold the engine at the
1. Measure the voltage at the battery
Actuator does
not energize
fully.
2. Momentarily connect Terminals A and
1. Measure
Engine remains
below desired
governed speed.
Test
desired running speed. Measure the
DC voltage between Terminals A(-) &
F(+) on the speed control unit.
while cranking.
F The actuator should move to the full
fuel position.
the actuator
Terminals A & B, while running under
governor control.
1. Actuator goes to full fuel. Then, dis-
connect speed sensor at Terminals C
& D.
If actuator still at full fuel speed control
unit defective. If actuator at minimum
fuel position - erroneous speed signal.
Check speed sensor data.
1. If the voltage reading is 1.0 to 2.0 VDC.
a) SPEED
desired speed.
b) Defective speed control unit.
2. If the voltage reading is above 2.0
VDC, a) Actuator or linkage binding.
3. If the voltage reading is below 1.0
VDC, a) Defective speed control unit.
4. Gain set too low.
1. If the voltage is less than 7V for a 12V
system, or14V for a 24V system,
replace the battery if it is weak or
undersized.
1. Actuator or battery wiring in error.
2. Actuator or linkage binding.
3. Defective actuator.
4. Fuse opens. Check for short in actua-
tor or actuator wiring harness.
output. 1. If voltage measurement is within
approximately 2 volts of the battery
supply voltage, then fuel control
restricted from reaching full fuel posi-
tion. Possibly due to interference from
the mechanical governor, carburetor
spring or linkage alignment.
2. Speed setting too low.
- 100 -
Probable Fault
adjustment set above