STUD 2120430 - Caterpillar

Table 2
Minimum Maximum Default
600 rpm 2120 rpm 2120 rpm "Allow Idle Shutdown Override"
This parameter determines if the clutch or the service brake can be used to override the idle shutdown timer during the driver alert. The driver alert is the last 90 seconds when the check engine lamp begins flashing. This parameter requires the "Idle Shutdown Time" to be programmed to three or more minutes for the parameter to be enabled. When the "Idle Shutdown Time" is programmed to zero, the parameter is turned off.In order to override the timer under the following conditions, depress the clutch or the service brake if the parameter is programmed to "Outside Temperature Based" or "J1587 Outside Temperature Based" and the driver alert is activated. Depression of the clutch or the service brake will override the timer:
The outside temperature is below the programmed "Minimum Idle Shutdown Outside Temperature".
The outside temperature is above the" Maximum Idle Shutdown Outside Temperature".Note: When the timer is overridden, the engine will not shut down.If the outside temperature is between the "Minimum Idle Shutdown Outside Temperature" and the "Maximum Idle Shutdown Outside Temperature", the timer is not overridden and the engine will shut down. If the "Outside Temperature Based" option is programmed, an air temperature sensor must be installed in order to measure the outside temperature. If the sensor is not installed, 171-03 Ambient Air Temperature voltage high will be active for the sensor. If the "J1587 Outside Temperature Based" option is programmed and 171-11 Ambient Air Temperature Data Lost is active, the idle shutdown timer will be disabled.
Table 3
Alternative Default
"No"
"Outside Temperature Based"
"(J1587) Outside Temperature Based" "Yes" "Minimum Idle Shutdown Outside Temperature"
This parameter determines the lower outside temperature limit when the "Allow Idle Shutdown Override" is programmed to one option of the options that follow:
"Outside Temperature Based"
"J1587 Outside Temperature Based"
Table 4
Minimum Maximum Default
−40 °C (−40 °F) 49 °C (120 °F) 49 °C (120 °F)
Illustration 1 g00631057
The "Allow Idle Shutdown Override" is programmed to the "Outside Temperature Based" option or to the "Outside Temperature Based (J1587)" option.
"Maximum Idle Shutdown Outside Temperature"
This parameter determines the upper outside temperature limit when the "Allow Idle Shutdown Override" is programmed to one option of the options that follow:
"Outside Temperature Based"
"J1587 Outside Temperature Based"Illustration 1 indicates that the "Allow Idle Shutdown Override" is allowed in the final 90 seconds of the timer's countdown. During the final 90 seconds, one of the following conditions must exist in order for the engine to be shut down:
The outside temperature is below the programmed "Minimum Idle Shutdown Outside Temperature".
The outside temperature is above the "Maximum Idle Shutdown Outside Temperature".
Table 5
Minimum Maximum Default
−40 °C (−40 °F) 49 °C (120 °F) 49 °C (120 °F) "A/C Switch Fan-On Time"
The input 11 to the ECM can be used for the connection of a normally closed high pressure A/C switch. The ECM has a built-in timer. The timer is used to prevent excessive cycling of the cooling fan clutch due to successive cycling of the A/C switch. Programming this