C13 and C15 On-highway Engines Caterpillar

"Lower Gears Engine RPM Limit"

This parameter causes the engine to accelerate at a slower rate when the rpm limit is exceeded under normal driving conditions. This can encourage the driver to shift to the next highest gear.

This parameter should remain at the default value if the vehicle is equipped with an automatic transmission. This parameter may be changed from the default value if the transmission is an Eaton Top 2.

"Lower Gears Turn Off Speed"

This parameter is the vehicle speed which turns off the "Lower Gears Engine RPM Limit". This must be matched with the "Lower Gears Engine RPM Limit" to the specific drive train for best performance.

This parameter should remain at the default value if the vehicle is equipped with an automatic transmission. This parameter may be changed from the default value if the transmission is an Eaton Top 2.

"Intermediate Gears Engine RPM Limit"

This parameter is similar to the "Lower Gears Engine RPM Limit". The engine will accelerate at a slower rate when this limit is exceeded under normal driving conditions. This parameter is typically programmed to a slightly higher rpm than the "Lower Gears Engine RPM Limit".

This parameter should remain at the default value if the vehicle is equipped with an automatic transmission. This parameter may be changed from the default value if the transmission is an Eaton Top 2.

"Intermediate Gears Turn Off Speed"

This parameter is similar to the "Lower Gears Turn Off Speed". This parameter is typically programmed to a slightly higher vehicle speed than the "Lower Gears Turn Off Speed".

This parameter should remain at the default value if the vehicle is equipped with an automatic transmission. This parameter may be changed from the default value if the transmission is an Eaton Top 2.

"Gear Down Protection RPM Limit"

This parameter is the engine rpm limit when the vehicle speed is above the "Gear Down Protection Turn On Speed". This is a hard limit. The Engine Control Module (ECM) will not allow fuel to the engine above this limit. This parameter is used to encourage the driver to shift into overdrive or top gear.

This parameter should remain at the default value if the vehicle is equipped with an automatic transmission. This parameter may be changed from the default value if the transmission is an Eaton Top 2.

"Gear Down Protection Turn On Speed"

This parameter is the vehicle speed when the "Gear Down Protection RPM Limit" is turned on. This must be matched to the specific drive train for best performance. The engine rpm is limited by the "Gear Down Protection RPM Limit" when the vehicle speed is above the value of this parameter.

"Low Idle Engine RPM"

This parameter is the minimum engine rpm.

"Transmission Style"

This parameter indicates the type of transmission that is installed in the vehicle. This parameter determines the signals that are read by the ECM:

• Brake switch (No. 2)

• Clutch pedal position switch

• Neutral switch

Program this parameter to "Automatic" if an automatic transmission is installed. The ECM will look for the brake switch (No. 1) and the neutral switch.

Program this parameter to "Manual" if a manual transmission is installed. The ECM will look for the brake switch (No. 1) and the clutch pedal position switch.

The Eaton Top 2 transmission is a manual transmission and the Eaton Top 2 transmission requires a clutch switch. A total of six parameters must be programmed for the system to operate correctly. The ECM operates two outputs in order to control shifting between the top two gears of an Eaton Top 2 transmission. The "Lockout Solenoid" and "Shift Solenoid" parameters must be programmed to the correct terminals on the P1 connector.

"Eaton Top 2 Override with Cruise Switch"

Program this parameter to "Yes" in order to prevent using the cruise control On/Off switch to disable Top 2 mode. If the cruise control On/Off switch is turned to the OFF position and the transmission is not in Top 2 mode, the Top 2 mode will be disabled.

This condition is applicable to the manual mode of operation only. If the cruise control On/Off switch is turned to the ON position, the Top 2 mode will be enabled and the transmission will be allowed to shift automatically in the Top 2 gears. When the vehicle is operating in one of the Top 2 gears and the Top 2 mode is enabled, switching the cruise control On/Off switch to the OFF position will place the transmission in hold mode. When the transmission is in the hold mode, the transmission will not shift out of the currently selected gear.

When the cruise control On/Off switch is returned to the ON position, the transmission returns to Top 2 mode. When the clutch is depressed and the transmission is in the hold mode, the manual mode is enabled and the Top 2 mode is disabled.

"Top Gear Ratio"

This parameter identifies the highest gear ratio for an Eaton Top 2 transmission. For example, tenth gear for an Eaton Super 10 Top 2 transmission is the top gear. The programmable range is 0.000 to 3.750 in 0.001 increments. The default is 0.000. Refer to ""Gear Ratios for Eaton Top 2 Transmission"" for programmable values for each Eaton Top 2 transmission.

Note: This parameter must be precisely programmed to three decimal places to ensure the proper operation of the Eaton Top 2 and Caterpillar engine drive train in the top two gears. A 253-11 diagnostic code may be activated if this parameter is programmed incorrectly.

"Top Gear Minus One Ratio"

This parameter identifies the second highest gear ratio for an Eaton Top 2 transmission. For example, ninth gear for an Eaton Super 10 Top 2 transmission is top gear minus one. The programmable range is 0.000 to 3.750 in 0.001 increments. The default is 0.000. Refer to ""Gear Ratios for Eaton Top 2 Transmission"" for programmable values for each Eaton Top 2 transmission.

Note: This parameter must be precisely programmed to three decimal places to ensure the proper operation of the Eaton Top 2 and Caterpillar engine drive train in the top two gears. A 253-11 diagnostic code may be activated if this parameter is programmed incorrectly.

"Top Gear Minus Two Ratio"

This parameter identifies the third highest gear ratio for an Eaton Top 2 transmission. For example, eighth gear for an Eaton Super 10 Top 2 transmission is top gear minus two. The programmable range is 0.000 to 3.750 in 0.001 increments. The default is 0.000. Refer to ""Gear Ratios for Eaton Top 2 Transmission"" for programmable values for each Eaton Top 2 transmission.

Note: This parameter must be precisely programmed to three decimal places to ensure the proper operation of the Eaton Top 2 and Caterpillar engine drive train in the top two gears. A 253-11 diagnostic code may be activated if this parameter is programmed incorrectly.

"Gear Ratios for Eaton Top 2 Transmission"

Note: The XX that appears in the model number of the transmission refers to the nominal torque capacity. XX times 100 equals the nominal torque capacity. For example, RTLO-14613A has a nominal torque capacity of 14 times 100 or 1900 N·m (1400 lb ft).

The model designation of the transmission and other information are stamped on a tag on the transmission. The tag is located on the lower left side near the front of the transmission.

"Governor Type"

This parameter determines the type of governor that controls the engine. Select "Full Range" for manual transmissions and for Eaton Top 2 transmissions. Select "Min/Max" for automatic transmissions.

The "Min/Max with Speed Control" option allows the use of a full range governor when the vehicle is not moving and the transmission is in neutral. The "Min/Max with Speed Control" option is preferred for applications that currently use the "Min/Max" governor.