Test Step 3. Check the Switch Circuit for the ECM -807640501

323

TM 9-2320-312-24-2

Troubleshooting Section

C. Operate the switch in the ON position and the

OFF position.

D. View the switch status on the electronic service

tool.

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

the switch parameter has not been programmed.

Expected Result:

The status screen should indicate "ON" if the switch

is turned ON. The status screen should indicate

"OFF" if the switch is OFF.

Results:

Yes The switch is operating normally. Continue

troubleshooting if the original condition is not

resolved. STOP.

No The ECM is not reading the switch status

change. Proceed to Test Step 3.

Test Step 3. Check the Switch Circuit for

the ECM.

g00682375

Illustration 142

Connector for Breakout T

G. Alternately remove the jumper wire and then

A. Turn the ignition key switch to the OFF position.

insert the jumper wire from terminal 5. At the

same time, monitor the status screen on the

B. Install a breakout T to the ECM vehicle harness

electronic service tool.

connector J1/P1.

C. Fabricate a jumper wire 100 mm (4 inch) long.

Expected Result:

Crimp a Deutsch pin to both ends of the wire.

The switch status changes to "ON" with the jumper

wire in place. The switch status changes to "OFF"

D. Insert the jumper wire into the suspected terminal

when the jumper wire is removed.

of the breakout T. Connect the other end of

the jumper wire to terminal 5 in the breakout T.

Terminal 5 is AP sensor/switch common.

Results:

Yes The ECM is functioning properly at this

E. Connect the electronic service tool to the cab

data link connector.

time. Proceed to Test Step 4.

No The ECM is not functioning properly.

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

Repair: Perform the following repair: