Perkins 1104E Series Troubleshooting Manual page 162

162
Troubleshooting Section
Test Step 8. Create a Short Circuit
Between the Signal and the Common
Terminals at the Engine Harness
Connector.
Illustration 75
Terminals for the pressure sensor connector
A. Turn the keyswitch to the ON position.
B. Fabricate a jumper wire 150 mm (6 inch) long.
Crimp a Deutsch terminal to both ends of the wire.
C. Monitor the "Active Diagnostic Code" screen of the
electronic service tool before installing the jumper
wire and after installing the jumper wire.
D. Install the jumper on the engine harness
connector. Install one end of the jumper at the
sensor signal (terminal "C"). Install the other
end of the jumper at the common connection
for the pressure sensor (terminal "B"). Wait at
least 15 seconds for activation of the short circuit
diagnostic code.
Refer to Illustration 75.
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 – The engine harness and the ECM are OK.
Repair: Perform the following repair:
1. Temporarily connect the suspect sensor.
2. Use the electronic service tool to verify if the
diagnostic code remains active.
3. If the diagnostic code is active replace the
sensor.
4. Use the electronic service tool to verify that the
repair eliminated the problem.
STOP.
•
Not OK – The open circuit diagnostic code
remains active when the jumper is installed. The
most probable location for the open circuit is in the
common wire for the sensor, or in the sensor signal
wire of the engine harness between the ECM and
the sensor. Remove the jumper. Proceed to test
step 9.
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