Perkins 1104E Series Troubleshooting Manual page 109

RENR2696-01
Test Step 7. Disconnect the Supply
Terminals of the Throttle Demand Sensor
at the ECM.
Illustration 31
Connections for the ECM terminals
A. Turn the keyswitch to the OFF position.
B. Remove P:45 (+5 volt supply) and P:44 (sensor
common) from the ECM connector P1.
C. Turn the keyswitch to the ON position.
D. Use the electronic service tool to check for active
diagnostic codes.
Expected Result:
The ECM is not working correctly.
The cable between the ECM and the throttle demand
sensor is faulty.
Results:
•
OK – Check for proper battery voltage.
Repair: Check the battery voltage for P1 between
terminal 56 and terminal 57 to terminal 68 and
terminal 69. The voltage should be between 11.0
to 13.5 volts for a 12 volt system. The voltage
should be between 22.0 to 27.0 volts for a 24
volt system. If the battery voltage is correct and
diagnostic codes are still active, then the ECM
does not operate correctly.
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 as the suspect ECM.
2. If the fault is eliminated with the test ECM,
reconnect the suspect ECM.
3. If the fault returns with the suspect ECM, then
the suspect ECM is faulty.
4. Replace the suspect ECM.
STOP.
•
Not OK – There is a short circuit in the harness
or connectors.
Repair: Connect the cables one at a time. Connect
terminal 44 to the ECM. Check if the diagnostic
code reappears. Then connect terminal 45 to the
ECM. Use the electronic service tool to check if
the diagnostic code reappears. Replace the faulty
cable. Verify that the repair has eliminated the fault.
STOP.
109
Troubleshooting Section
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