- Pressure Sensor (Engine Oil)
- Temperature Sensor (Engine Coolant)
- Fluid Level Sensor (Engine Coolant)
- Speed Sensor (Engine)
Pressure Sensor (Engine Oil)
Note: This description is for MUI engines.
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| Illustration 1 | g00593652 |
Pressure Sensor (Engine Oil) | |
The engine oil pressure sensor is an input of the GSC. The sensor tells the GSC the current engine oil pressure. The GSC shows the engine oil pressure on the lower display and the GSC also uses the sensor information to determine when a low engine oil pressure fault exists. The engine oil pressure sensor is mounted on the outside of one of the engine oil galleries. The engine model determines the exact location of the engine oil pressure sensor.
The engine oil pressure sensor is a pulse width modulated sensor. This sensor continuously generates a PWM signal. The duty cycle of the PWM signal varies from 10 to 90%. The duty cycle varies proportionally to the oil pressure of the engine. The GSC receives the PWM signal. The GSC measures the duty cycle in order to determine the oil pressure of the engine. The base frequency of the signal is constant at 500 ± 150 Hz. The signal wire of the oil pressure sensor connects to connector contact 8 of the GSC. The signal wire of the oil pressure sensor is found on connector contact "C". The sensor is supplied operating power (8 DCV) at connector contact "A" from the GSC (connector contact 9).
There are five setpoints that are related to engine oil pressure. The setpoints that are programmed into the GSC are P03, P04, P12, P13 and P14. See Systems Operation, "Engine/Generator Programming OP5".
Temperature Sensor (Engine Coolant)
Note: This description is for MUI engines.
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| Illustration 2 | g00310269 |
Temperature Sensor (Engine Coolant) | |
The engine coolant temperature sensor is an input of the GSC. The engine coolant temperature sensor tells the GSC the engine coolant temperature. The GSC shows the engine coolant temperature on the lower display. Also, the GSC uses the information from the sensor in order to determine when a high coolant temperature fault exists or a low coolant temperature fault exists. The engine coolant temperature sensor is mounted in the water jacket. The sensor is usually mounted toward the front of the engine. The exact location depends on the engine model.
The engine coolant temperature sensor is a pulse width modulated sensor (PWM). This sensor continuously generates a PWM signal. The duty cycle of the signal varies from 10 to 95% in proportion to the coolant temperature of the engine. The GSC receives the PWM signal and the GSC measures the duty cycle in order to determine the coolant temperature of the engine. The base frequency of the signal is constant at 455 Hz (370 to 550 Hz). The signal wire of the coolant temperature sensor connects to connector contact 7 of the GSC. The signal wire is found at connector contact "C" of the sensor. The sensor is supplied operating power (8 DCV) at connector contact "A" from the GSC connector contact 9.
There are four setpoints that are related to the engine coolant temperature. These setpoints are programmed into the GSC. The related setpoints are P03, P04, P15 and P16. See Systems Operation, "Engine/Generator Programming OP5".
Fluid Level Sensor (Engine Coolant)
Note: This description includes MUI engines and EUI engines.
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| Illustration 3 | g00474732 |
Fluid Level Sensor (Engine Coolant) | |
The fluid level sensor is an input of the GSC. The sensor tells the GSC when the engine has lost coolant. The GSC uses the information from the sensor in order to determine when a fault for a low coolant level exists. The sensor is usually mounted near the top of the engine radiator. The exact location depends on the engine model.
The fluid level sensor sends a ground signal to the GSC in order to indicate a normal level. The sensor sends a signal of 5 DCV in order to indicate a low level. The signal wire of the sensor connects to connector contact 13 of the GSC. The sensor is supplied with the power at connector contact "A" from the GSC (connector contact 9).
There are three setpoints that are related to the loss of engine coolant. The setpoints P04, P05 and P06 are programmed into the GSC. See Systems Operation, "Setpoint Programming OP5".
Speed Sensor (Engine)
Note: This description includes MUI engines and EUI engines.
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| Illustration 4 | g00311291 |
Speed Sensor (Engine) | |
The engine speed sensor is an input of the GSC. The sensor tells the GSC the engine speed. The GSC shows the engine speed on the lower display. Also, the GSC uses the information from the sensor for tasks. The tasks are included in the following list.
- activation of an overspeed shutdown
- terminating engine cranking
- determining the oil step speed
The engine speed sensor is mounted on the flywheel housing of the engine.
The sensor creates a sine wave signal from passing ring gear teeth at the rate of one pulse per tooth. The sensor sends a sine wave signal to the GSC. The frequency of the signal is in proportion to the speed of the engine. The GSC receives the sine wave signal and the GSC measures the frequency in order to determine the speed of the engine. The wires of the sensor connect to connector contacts 1 and 2 of the GSC within a shielded cable. One wire is grounded near the GSC.
There are four setpoints that are related to engine speed. The setpoints P09, P10, P11, and P12 are programmed into the GSC. See Systems Operation, "Setpoint Programming OP5".