Perkins 1104E Series Troubleshooting Manual page 111

RENR2696-01
Test Step 9. Check the Throttle Demand
Sensor at the ECM.
Illustration 32
Connections of the ECM terminals
A. Turn the keyswitch to the OFF position.
B. Remove terminal 16 from P1.
C. Connect a multimeter to terminal 16 and terminal
44.
D. Turn the keyswitch to the ON position.
E. Use the multimeter to display the output voltage
of the throttle demand sensor while the engine
speed control is moved from the minimum position
to the maximum position.
F. Turn the keyswitch to the OFF position and
connect terminal 16 to the P1 connector.
Expected Result:
The voltage should be between 0 and 100 percent
when the speed control is moved from the minimum
position to the maximum position.
Results:
• OK – The ECM terminals have the correct voltage
for the throttle demand sensor.
Repair: Check for the correct supply voltage at
the ECM. If the voltage is correct, then the ECM
is suspect.
1. Temporarily connect a test ECM.
Note: The test ECM should be programmed with the
correct software. All parameters should be set to the
same value of the suspected ECM.
2. If the fault is eliminated with the test ECM,
install the suspect ECM and verify that the fault
returns.
3. If the fault returns replace the ECM.
STOP.
•
Not OK – There is a fault in the harness or the
connectors between the sensor and the ECM.
Check the terminals between the MIC and the
throttle demand sensor. Repair the damaged
cables or replace the damaged cables. Check that
the repairs have eliminated the fault. STOP.
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Troubleshooting Section
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