The Caterpillar Electronic Technician (ET) can select the ECM response. The Cat ET can be used to program the level of engine monitoring and the delay times.
Note: The following tables are examples. The values may have changed. Use the Cat ET to determine the actual defaults and the specific configuration. Ensure that the engine is operating with the most current software version.
Programmable Monitoring System     | ||||||
Parameter     | ECM Response     | Default Trip Point     | Default Delay Time     | Limits     | ||
Range for Trip Point | Delay Time     | |||||
Low | High     |     | ||||
Low System Voltage     | Off     |     | ||||
Warning | 20 VDC     | 10 Seconds     | 20 VDC     | 22 VDC     | 1 to 30 seconds     | |
Low Oil Pressure     | Off     |     | ||||
Warning | (1)     | 4 Seconds     | N/A     | 1 to 15 seconds     | ||
Shutdown | (1)     | 9 Seconds     | N/A     | 1 to 15 seconds     | ||
High Coolant Temperature     | Off     |     | ||||
Warning | 102 °C (216 °F)     |
5 Seconds     | 90 °C (194 °F)     |
102 °C (216 °F)     |
1 to 60 Seconds     | |
Derate | 107 °C (225 °F)     |
30 Seconds     | 90 °C (194 °F)     |
107 °C (225 °F)     |
1 to 60 Seconds     | |
Shutdown | 107 °C (225 °F)     |
5 Seconds     | 90 °C (194 °F)     |
107 °C (225 °F)     |
1 to 60 Seconds     | |
Low Coolant Temperature     | Off     |     | ||||
Warning | 80 °C (176 °F)     |
5 Seconds     | 63 °C (145 °F)     |
85 °C (185 °F)     |
1 to 60 Seconds     | |
Engine Overspeed     | Off     |     | ||||
Warning | 1.18 × Rated Speed     | 0 Seconds     | 1200 rpm     | 2400 rpm     | 0 to 5 Seconds     | |
Shutdown (50 Hz) | 1.18 × Rated Speed     | 0 Seconds     | 1200 rpm     | 2400 rpm     | 0 to 5 Seconds     | |
Shutdown (60 Hz) | 1.18 × Rated Speed     | 0 Seconds     | 1200 rpm     | 2400 rpm     | 0 to 5 Seconds     | |
Air Filter Restriction Pressure     | Off     |     | ||||
Warning | 7 kPa (1 psi)     |
5 Seconds     | 3 kPa (0.4 psi)     |
7 kPa (1 psi)     |
1 to 60 Seconds     | |
Derate | 7 kPa (1 psi)     |
5 Seconds     | 1 kPa (0.14 psi)     |
7 kPa (1 psi)     |
1 to 60 Seconds     | |
Altitude     | Off     |     | ||||
Derate | (2)     | N/A     | 250 m (820 ft)     |
3658 m (12001 ft)     |
N/A     | |
High Exhaust Temperature     | Off     |     | ||||
Warning | (2)     | 5 Seconds     | 500 °C (932 °F)     |
800 °C (1472 °F)     |
1 to 60 Seconds     | |
Derate | (2)     | 5 Seconds     | 1 to 60 Seconds | |||
Oil Filter Differential     | Off     |     | ||||
Warning | 105 kPa (15 psi)     |
5 Seconds     | 70 kPa (10 psi)     |
105 kPa (15 psi)     |
1 to 60 Seconds     | |
Fuel Filter Differential     | Off     |     | ||||
Warning | 105 kPa (15 psi)     |
5 Seconds     | 70 kPa (10 psi)     |
105 kPa (15 psi)     |
1 to 60 Seconds     | |
Crankcase Pressure     | Off     |     | ||||
Warning | 2 kPa (0.3 psi)     |
3 Seconds     | 0.5 kPa (0.1 psi)     |
6 kPa (0.9 psi)     |
1 to 30 Seconds     | |
Derate | 6 kPa (0.9 psi)     |
10 Seconds     | 0.5 kPa (0.1 psi)     |
6 kPa (0.9 psi)     |
1 to 60 Seconds     | |
Shutdown | 3.5 kPa (0.5 psi)     |
3 Seconds     | 0.5 kPa (0.1 psi)     |
6 kPa (0.9 psi)     |
1 to 60 Seconds     | |
Aftercooler Water Temperature     | Off     |     | ||||
Warning | 102 °C (216 °F)     |
5 Seconds     | 40 °C (104 °F)     |
102 °C (216 °F)     |
1 to 60 Seconds     | |
Derate | 107 °C (225 °F)     |
5 Seconds     | 40 °C (104 °F)     |
107°C (225 °F)     |
1 to 60 Seconds     | |
Shutdown | 107 °C (225 °F)     |
5 Seconds     | 40 °C (104 °F)     |
107 °C (225 °F)     |
1 to 60 Seconds     |
( 1 ) | Refer to the oil pressure map. |
( 2 ) | Refer to the Performance and ratings manual. |
Oil Pressure Map
Illustration 1 | g00911985 |
Oil pressure map |
Separate timers are used in the ECM for each response that is associated with a parameter. Once the trip point is exceeded for an action, the timer for that action is started. For example, if the high Coolant Temperature Warning is set to 102 °C (216 °F) with a five seconds delay, the delay timer starts counting once the coolant temperature exceeds 102 °C (216 °F). If the coolant remained above 102 °C (216 °F) for five seconds, a warning would be issued.
The engine monitoring system is enabled after the engine is started. When the engine is within 50 rpm of low idle, the ECM will check the parameters. The ECM will not check the parameter for low oil pressure. Low oil pressure has an additional 10 second delay after the engine is started. The delay is designed to eliminate false low oil pressure warnings.
Use care when you program the trip point and the delay times. The resulting ECM response must be correct for the application. If the legal range is not exceeded the engine monitoring system will accept any setting.
If the trip point for a shutdown is lower than the trip point for a warning the engine will shut down. The warning will not be activated.
Once a parameter has exceeded the trip point the parameter must drop a certain amount below the trip point before the ECM response will end.
If a warning is programmed to 102 °C (216 °F) the temperature must exceed the range in order for the warning to activate. The temperature must decrease below 99 °C (210 °F) for the warning to stop. The variance is the hysteresis. The following table gives the hysteresis for each parameter.
Parameter     | Hysteresis     |
ECM Voltage     | 3 VDC     |
Oil Pressure     | 20 kPa (3 psi)     |
High Coolant Temperature     | 3 °C or 6 °F     |
Low Coolant Temperature     | 3 °C or 6 °F     |
Overspeed     | 100 rpm     |
Air Inlet Restriction     | N/A     |
Altitude     | N/A     |
High Exhaust Temperature     | 102 °C (216 °F)     |
Oil Filter Differential Pressure     | 10 kPa (1.5 psi)     |
Fuel Filter Differential Pressure     | 10 kPa (1.5 psi)     |
Crankcase Pressure     | N/A     |
Aftercooler Water Temperature     | 3 °C or 6 °F     |
Most active engine derates that occur are activated when the associated parameter is out of range.
When the parameter returns to normal operation, the active engine derate is disengaged.
There are a few exceptions:
- High exhaust temperature
- High air filter restriction
- Crankcase pressure
The active engine derate is latched until the ECM is powered down.