Test Step 7. Insert a Jumper at the Bulkhead Connector

233

TM 9-2320-312-24-2

Troubleshooting Section

Test Step 7. Insert a Jumper at the

Bulkhead Connector.

Table 169

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.

The Set Switch wires are disconnected.

OFF

Open

The 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

No The problem is in the vehicle wiring between

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

the bulkhead connector and the ECM.

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

Crimp a Deutsch pin to both ends of the wires.

Repair: Perform the following repair:

C. Find the suspect switch terminal and the ap

Inspect the vehicle wiring and repair the vehicle

sensor/switch sensor Common terminal in the

wiring, as required. If the problem still exists with

engine side of the bulkhead connector for the

the wiring, send the vehicle to the OEM dealer.

vehicle harness.

STOP.

D. Insert the jumper wire between the two terminals

in the engine side of the bulkhead connector.

i01631916

ECM Memory - Test

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

F. Connect ET to the cab data link connector.

SMCS Code: 1901-081

G. Access the status screen.

System Operation Description:

H. While the switch status is being monitored on the

Use this procedure under the following situation:

status screen alternately remove the jumper wire

between the two terminals, and alternately insert

Use this procedure if one of the following diagnostic

the jumper wire between the two terminals.

codes is present:

Refer to Table 169.

252-11 Incorrect Engine Software (59)

Expected Result:

253-02 Check Customer or System Parameters

(56)

The switch status changes per the information in

Table 169.

253-14 Truck Manufacturer Parameter Not

Programmed (56)

Results:

Also, use this procedure if the integrity of the

Yes The problem is in the vehicle wiring

Customer Parameters or the System Parameters in

between the bulkhead connector and the switch.

the ECM is questionable. Also, use this procedure

if the data for the Engine Lifetime Totals is

Repair: Perform the following repair:

questionable.

Inspect the vehicle wiring and repair the vehicle

The following background information is related

wiring, as required. If the problem still exists with

to this procedure:

the wiring, send the vehicle to the OEM dealer.

STOP.