Test Step 6. Insert a Jumper at the Suspect Switch

232

TM 9-2320-312-24-2

Troubleshooting Section

Test Step 6. Insert a Jumper at the

Suspect Switch.

Table 168

Table for Status of the Cruise Control Switch Input

Condition of Switch Circuit

Switch Status

Circuit

The wires for the Cruise/Idle On/Off Switch are

OFF

Open

disconnected.

The wires for the Cruise/Idle On/Off Switch are

Shorted

connected.

Set Switch wires are disconnected.

OFF

Open

Set Switch wires are connected.

Set Switch ON

Shorted

The Resume Switch wires are disconnected.

OFF

Open

The Resume Switch wires are connected.

Resume Switch ON

Shorted

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

B. Ensure that ECM vehicle harness connector

J1/P1 is connected.

C. Find the suspect switch in the vehicle.

D. Disconnect the wires from the suspect switch

terminals.

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

F. Connect ET to the cab data link connector.

G. Access the status screen.

H. While the switch status is being monitored on

the status screen slowly connect the suspect

switch wires and slowly disconnect the suspect

switch wires.

Refer to Table 168.

Expected Result:

The switch status changes per the information in

Table 168.

Results:

Yes

Repair: Perform the following repair:

Replace the faulty switch.

Verify that the repair eliminates the problem.

STOP.

No There is a problem in the harness between

the switch and the ECM. Proceed to Test Step 7.