Perkins M216C - Throttle Position Sensor - Test

KENR9126 207
Troubleshooting Section
Test Step 2. Test the Switch for Proper
Operation
A. Disconnect the P1 connector.
B. Refer to Table
34. Determine the P1 terminal for
the suspect switch.
Table 34
Terminals for the Switch Inputs
Name of the
Switch
P1 Terminals E-C2 Terminals
“Trolling m ode
switch”
49 37
“Slow vess
el
mode switch”
48 38
“Maintenance
clear switch”
51 39
“Trip clear
switch”
50 19
“Remote
shutdown switch”
52 36
“Synchronize
switch
1”
47 34
“Synchronize
switch 2”
46 35
C. Connect a meter lead to the P1 terminal for the
suspect switch. Connect the other meter lead to
engine ground.
Note: Wiggle the harnesses during the following
measurements in order to reveal any intermittent
conditions.
D. Measure the resistance between the P1 terminal
for the suspect switch and engine ground.
E. Activate the switch and measure the resistance
again.
Expected Result:
When the switch is not activated, the resistance
measurement indicates an open circuit. When the
switch is activated, the resistance measurement
indicates a short circuit.
Results:
•
OK – When the switch is not activated, the
resistance measurement indicates an open circuit.
When the switch is activated, the resistance
measurement indicates a short circuit. The switch
is operating correctly. The wiring does not have a
short circuit or an open circuit.
Repair: Operate the engine and check the switch
for proper operation.
If the switch does not operate correctly, there may
be a short circu
it between the circuit for the suspect
switch and another circuit. Carefully reinspect the
components. Refer to the diagnostic functional test
Troubleshoot
ing, “Electrical Inspectors - Inspect”.
Locate the short circuit and make repairs.
STOP.
•
Not OK – Both resistance measurements indicate
an open circ
uit or both resistance measurements
indicate a short circuit. There is a problem with the
circuit for the switch.
Repair: Theproblemcouldbeintheswitch,inthe
wiring, or in a connector.
Carefully reinspect the components. Refer to
the diagnostic functional test Troubleshooting,
“Electric
al Inspectors - Inspect”.
If the inspection does not identify the faulty
componen
t, replace the switch and test the switch
again.
If the pro
blem is not resolved, repair the wiring or
the connector. Replace parts, if necessary. Verify
that the problem is resolved.
STOP.
i04013629
Throttle Position Sensor - Test
Test Step 1. Check the Throttle for Proper
Operation
A. Remove the electrical power from th e ECM.
B. Insp
ect the throttle linkage for components with
the following conditions:
•
Loos
e
•
Bent
•
Broken
•
Mis
sing
•
Worn
Note: The sensor stops are not intended to be the
primary means of limiting the travel of the throttle. If
yo
u apply excessive force to the sensor stops you
will damage the sensor assembly.
C
.
M
ove the throttle throughout the entire range. The
throttle should move without binding and without
excessive drag.