Test Step 1. Inspect Electrical Connectors and Wiring -807640519

341

TM 9-2320-312-24-2

Troubleshooting Section

g00721539

Illustration 147

Terminal locations for ECM

Test Step 1. Inspect Electrical Connectors

Results:

and Wiring.

OK Proceed to Test Step 2.

A. Thoroughly inspect ECM vehicle harness

Not OK

connector J1/P1, the firewall bulkhead connector,

the connectors for the power train control

Repair: Perform the following repair:

module, and the connector terminals for the

SAE J1939 data link. Refer to Troubleshooting,

Repair the connectors or wiring and/or replace

"Electrical Connectors - Inspect" for details.

the connectors or wiring. Ensure that all of the

seals are properly in place and ensure that the

B. Perform a 45 N (10 lb) pull test on each of the

connectors are completely coupled.

wires in the ECM connector that are associated

with the SAE J1939 Data Link.

Verify that the repair eliminates the problem.

Refer to Illustration 147.

STOP.

C. Check the ECM connector (allen head screw) for

Test Step 2. Connect an Electronic

the proper torque of 6.0 Nm (55 lb in).

Service Tool and Check for Active

Diagnostic Codes.

D. Check the harness and wiring for abrasion and

pinch points from the data link connectors back

to the ECM.

A. Connect the electronic service tool to the cab

data link connector.

Expected Result:

B. Turn the ignition key switch to the ON position.

All connectors, pins and sockets should be

completely coupled and/or inserted and the harness

C. Monitor the active diagnostic code screen of the

and wiring should be free of corrosion, abrasion

electronic service tool. Check and record active

or pinch points.

diagnostic codes.