Test Step 3. Check the Cruise Control Switch Status on ET

229

TM 9-2320-312-24-2

Troubleshooting Section

Test Step 3. Check the Cruise Control

Test Step 4. Operate the Vehicle and

Switch Status on ET.

Check the Kickout Status Parameter.

Table 166

A. For an intermittent cruise control kickout, talk to

the driver in order to determine the conditions

Table for Cruise Control Switch Status

when the kickout occurs. Topics of examination

Switch Position

Switch Status

Circuit

could be the following examples:

The Cruise/Idle On/Off

Closed

specific speed

Switch is turned ON.

The Cruise/Idle On/Off

road conditions

OFF

Open

Switch is turned OFF.

weather conditions

The Set/Resume Switch

Set Switch ON

Closed

is in the SET position.

Take the vehicle for a road test in order to

The Set/Resume Switch

duplicate these conditions and set the cruise

Resume Switch

Closed

is in the RESUME

control. Operate the vehicle in cruise control until

position.

the problem reoccurs.

A. Access the status screen on ET.

B. For an intermittent idle kickout, talk to the driver

in order to determine the conditions when the

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

kickout occurs. A topic of examination could be

the following example:

C. Operate the cruise control on/off switch while the

status of the cruise/idle on/off switch is being

specific engine rpm

observed.

Start the engine. Duplicate these conditions and

D. Leave the cruise control on.

set the idle rpm. Operate the vehicle in idle until

the problem reoccurs.

E. Operate the set switch while the status of the

set/resume switch is being observed. The status

Note: The status screen will only indicate the last

screen should indicate "Set Switch ON" when

kickout. The status screen will lose this information

the set switch is held in the SET position. The

if the ignition key switch is turned OFF.

status screen should indicate "Off" when the set

switch is released.

C. Connect ET and check the status screen for

the last cause of the kickout. Refer to Tables

F. Operate the resume switch while the status of

162, 163, 164, and 165 for an explanation of the

the resume switch is being observed. The status

status parameter.

screen should indicate "Resume Switch ON"

when the resume switch is held in the RESUME

D. If the status screen is blank, then either there

position. The status screen should indicate "Off"

was no kickout of the cruise control, or the

when the resume switch is released.

power to the ECM was turned OFF before the

information could be read. Repeat this test step.

Expected Result:

Note: A status screen that is blank indicates No

The switch status changes per the information in

Occurrence.

Table 166.

Expected Result:

Results:

RESULT 1 The status screen displays the following

Yes The switches are operating normally. STOP.

result:

Intermittent Problem Suspected Proceed to Test

"Switch Turned Off"

Step 4.

RESULT 2 The status screen displays the following

No The ECM is not reading the switch status

result:

change. Proceed to Test Step 5.

"Cruise Control PAUSE Switch"

RESULT 3 The status screen displays the following

results:

"Vehicle Speed < Limit"