Test Step 1. Inspect Electrical Connectors and Wiring -807640459

281

TM 9-2320-312-24-2

Troubleshooting Section

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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.

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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.