Perkins 1104E Series Troubleshooting Manual page 177

RENR2696-01
Test Step 6. Check The Operation Of The
ECM By Creating An Open And A Short
Circuit At The ECM Connector.
Illustration 89
A. Turn the keyswitch to the OFF position.
B. Disconnect the J1/P1 ECM connector.
C. Disconnect the connector for the ECM harness.
Thoroughly inspect both halves of the connector
for signs of corrosion or moisture. Refer to
Troubleshooting, "Electrical Connectors - Inspect".
D. Turn the keyswitch to the ON position. Use the
electronic service tool in order to monitor the
"Active Diagnostic Code" screen. 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 pressure sensors.
E. Turn the keyswitch to the OFF position.
F. Fabricate a jumper wire 150 mm (6 inch) long.
Crimp a Deutsch terminal to both ends of the wire.
G. Monitor the "Active Diagnostic Code" screen on
the electronic service tool before installing the
jumper wire and after installing the jumper wire.
H. Install the jumper on the engine harness
connector. Install one end of the jumper at the
sensor signal on the bypass harness. Install
the other end of the jumper at the terminal 34
common connection for the bypass harness. Wait
at least 15 seconds for activation of the short
circuit diagnostic code.
Expected Result:
A short circuit diagnostic code is active when the
jumper is installed. An open circuit diagnostic code is
active when the jumper is removed.
Results:
•
OK – Verify that the repair eliminates the problem.
Use the electronic service tool to clear the logged
diagnostic codes. Proceed to test step 7.
•
Not OK
Repair: 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 of the suspect ECM.
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Troubleshooting Section
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