Illustration 158 ECM Breakout T-connector

360

TM 9-2320-312-24-2

Troubleshooting Section

7. If the problem returns with the suspect ECM,

Refer to Illustration 157.

replace the ECM.

Expected Result:

8. Verify that the repair eliminates the problem.

The switch status of the cruise control set/resume

STOP.

switch on ET behaves in the following manner:

Test Step 8. Check the Status of the

The switch status of the cruise control set/resume

Remote PTO Set Switch and the Remote

switch is "OFF" when the jumper is removed.

PTO Resume Switch on ET.

The switch status of the cruise control set/resume

switch changes from "OFF" to set switch "ON"

when the jumper is connected from terminal

35 (Set) to terminal 5 (AP sensor/switch sensor

common).

The switch status of the cruise control set/resume

switch changes from "OFF" to resume switch

"ON" when the jumper is connected from terminal

44 (switch resume terminal) to terminal 5 (AP

sensor/switch sensor common).

Results:

Yes The set input and the resume input of the

ECM are functioning correctly. The problem is in

the switches of the vehicle or the problem is in

the wiring of the vehicle.

Repair: Inspect the wiring. Select one of the

following options:

g00768769

Illustration 158

Repair the wiring or replace the wiring.

ECM Breakout T-connector

Send the vehicle to the OEM dealer for repair.

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

Verify that the repair eliminates the problem.

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

Crimp a Deutsch pin to both ends of the wire.

STOP.

C. Disconnect vehicle harness connector P1 from

No The ECM is not reading the switch status

the ECM.

change.

D. Connect a breakout T to ECM connector J1 and

Repair: Perform the following diagnostic

connect P1 to the breakout T.

procedure:

E. Connect ET to the cab data link connector.

1. Temporarily connect a test ECM.

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

2. Ensure that the "PTO Configuration" of the test

ECM matches the "PTO Configuration" of the

G. Access the Remote PTO Set Switch and Remote

suspect ECM.

PTO Resume Switch status on ET.

3. Remove all jumpers and replace all connectors.

H. While the status of the Remote PTO Set Switch is

being observed on ET, install the jumper into the

4. Recheck the system for active diagnostic

breakout T in order to connect terminal 58 (input

codes.

2) to terminal 3 (input sensor common #2). Also,

while the switch status is being observed on ET

5. Repeat the test step.

remove the jumper from the breakout T in order

to disconnect terminal 58 (input 2) from terminal

6. If the problem is resolved with the test ECM,

3 (input sensor common #2).

reconnect the suspect ECM.