Test Step 1. Inspect Electrical Connectors and Wiring -807640525

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TM 9-2320-312-24-2

Troubleshooting Section

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

wiring should be free of corrosion, abrasion or pinch

points.

Results:

OK Proceed to Test Step 2.

Not OK Repair the wiring and connectors or

replace the wiring or the connectors. Ensure that

all of the seals are properly connected. Verify that

the repair eliminates the problem. STOP.

Test Step 2. Check the Switch Status on

A. Connect Electronic Technician (ET) to the cab

data link connector.

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

C. Operate the switch in the ON position and the

OFF position.

D. View the switch status on ET.

E. If the switch status indicates "Not Installed", the

parameter "PTO Engine Shutdown Switch" has

not been programmed.

Expected Result:

The status screen should indicate "ON" if the switch

is turned ON. The status screen should indicate

g00839590

Illustration 150

"OFF" if the switch is OFF.

Terminal locations for P1 connector

Results:

A. Thoroughly inspect the ECM vehicle harness

connector J1/P1, the connectors, and the firewall

Yes The switch is operating normally. Continue

bulkhead connectors. Refer to Troubleshooting,

troubleshooting if the original condition is not

"Electrical Connectors - Inspect" for details.

resolved. STOP.

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

No The ECM is not reading the change in the

wires in the ECM connector that are associated

status of the switch. Proceed to Test Step 3.

with the suspect switch circuit.

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

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

D. Check the harness and the wiring for abrasion

and for pinch points from the battery to the ECM.

Then, check from the ignition key switch to the

ECM.

Refer to Illustration 150 for terminal locations

for the ECM.