CAP 2977662 - Caterpillar

"Fan Override Switch"
This parameter selects the J1939 source that will broadcast a switch position in order to override the fan control. When the fan override switch is activated, the ECM will receive a J1939 message. The ECM will disregard all other parameters for fan control and the ECM will turn on the fan.Note: If "Fan Control Type" is programmed to "On/Off" or to "Variable Speed Fan Option S" the transmission may cause the fan to turn ON via the J1939 Data Link. The transmission will turn the cooling fan ON if the transmission oil temperature is too hot.
Table 1
Alternative     Default    
"J1939 Body Controller"
"J1939 Cab Controller"
"J1939 Instrument Cluster"     "None"    "Transmission Neutral Switch"
This parameter is used to specify the input that will be used by the ECM to receive the status information from the neutral switch. The default J1/P1:62 configures the ECM to monitor pin 62 of the vehicle harness connector for a connection for the neutral switch circuit.The ECM can also be configured to receive the status of the neutral switch via the J1939 data link. The transmission ECU must be capable of supporting the required protocol of the broadcast announcement message.
Table 2
Alternatives     Default    
"J1939", "None"     "J1/P1:62"    "Exhaust Brake Switch"
The exhaust brake can be controlled by connecting an on/off switch into the ECM circuit for the output of the exhaust brake. The "Exhaust Brake Switch" parameter must be programmed to "None" if a switch is installed in the output circuit. A switch that is installed in the output circuit will disable the brake by opening the output circuit.The exhaust brake can also be controlled by connecting a switch circuit to the ECM switch input. This parameter must be programmed to "J1/P1:16", to "J1939 Body Controller", to "J1939 Cab Controller", or to "J1939 Instrument Cluster" if a switch is connected to the ECM at the dedicated input for the exhaust brake.
Table 3
Alternative     Default    
"J1/P1:16"
"J1939 Body Controller"
"J1939 Cab Controller"
"J1939 Instrument Cluster"     "None"    "Ignore Brake/Clutch Switch"
This parameter configures an input for a brake/clutch disable switch. The "Ignore Brake/Clutch Switch" is used for applications that require the mobile use of the vehicle with a set engine rpm that does not require the brake or the clutch to disengage the engine rpm set speed. This parameter must be programmed to "J1/P1:47" for this feature to be enabled.
Table 4
Alternative     Default    
"J1/P1:47"     "None"    "Two-Speed Axle Switch"
This parameter configures an input for a two-speed axle switch. When a two-speed axle is used, the change in gear ratios from the main drive axle ratio to the two-speed axle ratio alters the calibration of the vehicle speed signal. When the parameter is programmed to "J1/P1:6" and the switch is in the ON position the ECM automatically adjusts the vehicle speed calibration. This will ensure that the ECM driven speedometer and the information that is stored in the ECM correctly reflect the actual vehicle speed.
Table 5
Alternative     Default