A second programmable parameter "Fast Idle RPM #2"

274

TM 9-2320-312-24-2

Troubleshooting Section

A second programmable parameter "Fast Idle RPM

#2" provides a second engine rpm set speed. The

ECM will increase the engine speed from low idle to

the engine speed that is programmed in the "Fast

Idle RPM #1" parameter when the fast idle switch

is pressed and then released. The ECM will set the

engine speed to the rpm that is programmed in the

"Fast Idle RPM #2" parameter when the fast idle

switch is pressed and then released again.

Input 18 (terminal 40) is used as a dedicated switch

input for fast idle operation. This feature does not

require an input selection to be programmed to

enable the switch input. A momentary connection

between terminal 40 and a sensor common will

initiate the fast idle operation. The "Fast Idle RPM

#2" and/or "Fast Idle RPM #1" parameters must

be programmed to the desired engine operating

speeds.

The engine rpm set speed will not be maintained if

any of the following actions occur:

g00770407

Illustration 106

The service brake is depressed.

The clutch pedal is depressed.

The neutral switch indicates that the transmission

is in gear.

An optional fast idle lamp can be connected to

output 9 in order to indicate when fast idle is in

operation. When the "Truck Manufacturer" parameter

is configured to "Other", the "Output #9" parameter

must be programmed to "Fast Idle Lamp" to enable

the lamp operation. If the "Output #9" parameter

is programmed to "Wait to Start Lamp", the lamp

will turn on when the air inlet heater is active. When

the "Truck Manufacturer" parameter is configured to

"GM", output 9 can only be used as a fast idle lamp

output, and no programming is necessary.

g00770414

Illustration 107