Perkins 1104E Series Troubleshooting Manual page 163

RENR2696-01
Test Step 9. Check the Operation of the
ECM by Creating Open and Short Circuits
at the ECM Connector.
Illustration 76
A. Turn the keyswitch to the OFF position.
B. Disconnect J1/P1.ECM connector. Thoroughly
inspect both halves of the connectors for signs of
corrosion or moisture.
C. Refer to Troubleshooting, "Electrical Connectors
- Inspect".
D. Reconnect J1/P1 ECM connector.
E. Turn the keyswitch to the ON position. Monitor the
"Active Diagnostic Code" screen of the electronic
service tool. Wait at least 15 seconds for activation
of the code.
An open circuit diagnostic code should be active
for the suspect sensor.
Note: When the engine harness is disconnected, all
of the open circuit diagnostic codes for the pressure
sensors will be active. This is normal. Disregard the
diagnostic codes for the other pressure sensors.
Direct your attention to the diagnostic codes for the
suspect sensor only.
F. Turn the keyswitch to the OFF position.
G. Fabricate a jumper wire 150 mm (6 inch) long.
Crimp a Deutsch socket to both ends of the wire.
H. Install the jumper wire on the ECM connector J1.
Insert the jumper wire between the terminal for the
suspect sensor signal and the common connection
for the engine's pressure sensor (terminal 3).
Use the electronic service tool to verify that there
is a short circuit diagnostic code.
Refer to Illustration 76 for the ECM connectors.
Expected Result:
Open circuit diagnostic codes and short circuit
diagnostic codes were active.
Results:
•
OK – The ECM is operating properly. Proceed to
Test Step 10.
•
Not OK – One of the following conditions exists:
The open circuit diagnostic code is not active when
the harness is disconnected. The short circuit
diagnostic code is not active when the jumper wire
is installed.
Repair: Perform the following repair:
1. Temporarily connect a test ECM.
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Troubleshooting Section
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