Cruise Control Switch Circuit

219

TM 9-2320-312-24-2

Troubleshooting Section

Test Step 10. Use the "Cooling Fan

i01604160

Solenoid Special Test" on ET to Check

Cruise Control Switch Circuit

the ECM.

- Test

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

SMCS Code: 1900-081-ZS

B. Disconnect the ECM vehicle harness connector

J1/P1.

System Operation Description:

C. Remove terminal 11 (Output 5) from the vehicle

Use this procedure under the following situation:

harness connector P1.

Use this procedure to determine if one of the

D. Connect a breakout T to the ECM connector J1

following switches is preventing normal operation of

and vehicle harness connector P1.

cruise control, fast idle, idle set speed, extended

idle, or PTO operation:

E. Connect a voltage test lamp between terminal

11 (Output 5) and terminal 67 (negative battery)

Cruise control on/off switch

of the breakout T.

Cruise control set/resume switch

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

The following switch circuits can also prevent the

G. Access the "Cooling Fan Special Test" on ET.

correct operation of the cruise control, idle set

speed, fast idle, extended idle, or PTO operation:

Cycle the "Cooling Fan Special Test" to the ON

position and to the OFF position. At the same

Service brake pedal position (switch 1)

time, watch the voltage test lamp.

Service brake pedal position (switch 2)

Note: A multimeter can not be used in place of the

voltage test lamp when the ECM output is tested.

Clutch switch

Expected Result:

Neutral switch

The voltage test lamp turns to the ON position when

Cruise control set/resume switch

the test is "Active". The voltage test lamp turns to

the OFF when the test is "NOT Active".

Cruise control on/off switch

Results:

PTO on/off switch

Yes The output for the ECM cooling fan relay

Cruise control pause switch

is functioning properly.

The switches are described in the respective circuit

Repair: If a problem still exists, then the problem

tests in Troubleshooting.

is in the OEM Wiring. Repair the problem or send

the vehicle to the OEM dealer for repair.

All of the following Customer Programmable

Parameters can affect cruise control, fast idle, idle

Verify that the repair eliminates the problem.

set speed, extended idle, and PTO operation:

STOP.

"Low Cruise Control Speed Set Limit"

"High Cruise Control Speed Set Limit"

Repair: Temporarily connect a test ECM. Use the

"Idle Vehicle Speed Limit"

special test on ET to check the ECM cooling fan

circuit. If the problem is resolved with the test

"Idle RPM Limit"

ECM, install the suspect ECM. If the problem

returns with the suspect ECM, replace the ECM.

"Fast Idle RPM #1"

Verify that the repair eliminates the problem.

"Fast Idle RPM #2"

STOP.

"Cruise/Idle/PTO Switch Configuration"

"Idle/PTO Bump rpm"