Test Step 1. Inspect Electrical Connectors and Wiring -807640500

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TM 9-2320-312-24-2

Troubleshooting Section

g00728814

Illustration 141

Terminal Locations for ECM

Test Step 1. Inspect Electrical Connectors

Expected Result:

and Wiring

All connectors, pins, and sockets are completely

coupled and/or inserted, and the harness and

A. Thoroughly inspect the ECM vehicle harness

wiring should be free of corrosion, abrasion or pinch

connector J1/P1, the connectors, and the firewall

points.

bulkhead connectors. Refer to Troubleshooting,

"Electrical Connectors - Inspect" for details.

Results:

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

OK Proceed to Test Step 2.

wires in the ECM connector that are associated

with the suspect switch circuit.

Not OK Repair the wiring and connectors or

replace the wiring or the connectors. Ensure that

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

all of the seals are properly connected. Verify that

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

the repair eliminates the problem. STOP.

D. Check the harness and the wiring for abrasion

Test Step 2. Check the Switch Status on

and for pinch points from the battery to the ECM.

an Electronic Service Tool

Then, check from the ignition key switch to the

ECM.

A. Connect the electronic service tool to the cab

Refer to Illustration 141 for terminal locations

data link connector.

for the ECM.

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