Perkins M216C - Page 208

208 KENR9126
Troubleshooting Section
Expected Result:
The throttle linkage is in good condition. The throttle
moves without binding and without excessive drag.
Results:
•
OK – The throt
tle linkage is in good condition. The
throttle operates properly. Proceed to Test Step 2.
•
Not OK – One o
f the following conditions exist:
The throttle linkage is not in good condition. The
throttle binds or the throttle has excessive drag.
Repair: Identify the source of the mechanical
problem and make repairs. Replace parts, if
necessary
.
Proceed to Test Step 2 when the throttle operates
properly.
Test Step 2. Adjust the Throttle Linkage
for the Low Idle Position
A. Connect the electronic service tool to the service
tool connector.
B. Restore the electrical power to the ECM. Do not
start the engine.
C. Place the throttle in the low idle position.
D. Observ
e the duty cycle for the throttle position
sensor on the electronic service tool.
Note:
Adjustment of the sensor stops is not
necessary.
E. Adjus
t the throttle linkage in order to achieve a
5to10percentdutycyclewhilethethrottleisin
the low idle position.
Expected Result:
The d
uty cycle is between five and ten percent when
the throttle is in the low idle position.
Res
ults:
•
OK – The duty cycle is between five and ten
per
cent when the throttle is in the low idle position.
Proceed to Test Step 3.
•
No
t OK – The throttle linkage cannot be adjusted
in order to obtain a 5 to 10 percent duty cycle when
the throttle is in the low idle position. There is a
pr
oblem with the throttle linkage.
Repair: Repair the throttle linkage. Replace parts,
i
f necessary. Verify that the problem is resolved.
STOP.
Test Step 3. Adjust the Throttle Linkage
for the High Idle Position
A. Place the throttle in the high idle position.
B. Observe the d
uty cycle for the throttle position
sensor on the electronic service tool.
Note: Adjus
tment of the sensor stops is not
necessary.
C. Adjust the t
hrottle linkage in order to achieve a 90
to 95 percent duty cycle when the throttle lever is
inthehighidleposition.
Expected Result:
The duty cy
cle is between 90 to 95 percent when the
throttle is in the high idle position.
Results:
•
OK – The duty cycle is between 90 to 95 percent
when the
throttle is in the high idle position.
Repair: Perform the following procedure:
1. Verify that the duty cycle is between five and
ten percent when the throttle is in the low idle
positi
on.
2. Verify that the duty cycle is between 90 and
95 perc
ent when the throttle is in the high idle
position.
If the
duty cycle is not correct at either throttle
position, repeat this procedure.
If the
throttle linkage cannot be adjusted in order
to meet the specifications, replace the throttle
lever assembly.
Verify that the problem is resolved.
STOP
.
•
Not OK – The throttle linkage cannot be adjusted
in o
rdertoobtaina90to95percentdutycycle
when the throttle is in the high idle position. There
is a problem with the throttle linkage.
Repair: Repair the throttle linkage. Replace parts,
if necessary.
Verify that the problem is resolved.
ST
OP.