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281
TM 9-2320-312-24-2
Troubleshooting Section
g00844899
Illustration 114
Circuit schematic for the fuel level sensors
Test Step 1. Inspect Electrical Connectors
C. Check the ECM connector (allen head screw) for
And Wiring.
the proper torque of 6.0 Nm (55 lb in).
D. Check the harness and wiring for abrasion and
pinch points from the sensors to the ECM.
Expected Result:
All connectors, pins and sockets should be
completely coupled and/or inserted and the harness
and wiring should be free of corrosion, abrasion
or pinch points.
Results:
OK Proceed to Test Step 2.
Not OK
Repair: Repair the connectors or wiring and/or
replace the connectors or wiring. Ensure that all
of the seals are properly in place and ensure that
the connectors are completely coupled.
g00844988
Illustration 115
Verify that the repair eliminates the problem. Clear
Terminal locations for ECM
all diagnostic codes.
A. Thoroughly inspect ECM vehicle harness
STOP.
connector J1/P1 and the terminals for the
fuel level sensors in the connectors. Refer to
Test Step 2. Verify that the Diagnostic
Troubleshooting, "Electrical Connectors-Inspect"
Code is Still Active.
for details.
A. Connect Caterpillar Electronic Technician (ET) to
B. Perform a 45 N (10 lb) pull test on each of the
the cab data link connector.
wires in the ECM connector that are associated
with the following connections:
B. Turn the ignition key switch to the ON position.
Wait at least 15 seconds for activation of the
terminal 3
diagnostic codes.
terminal 15
C. Monitor the "Active Diagnostic Code" screen of
ET. Check and record active diagnostic codes.
terminal 26
D. Determine if the problem is related to an
Refer to Illustration 115.
open circuit diagnostic code or a short circuit
diagnostic code.

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