| |
| Illustration 1 | g00627170 |
|
C-10 and C-12 Truck Engine (1) Coolant temperature sensor (4) Inlet manifold air temperature sensor (5) Engine oil pressure sensor | |
| |
| Illustration 2 | g00627248 |
|
3406E Truck Engine (1) Coolant temperature sensor (2) Fuel temperature sensor (3) Atmospheric pressure sensor (4) Inlet manifold air temperature sensor (5) Engine oil pressure sensor | |
| |
| Illustration 3 | g00626926 |
|
C-15 and C-16 Truck Engine (1) Coolant temperature sensor (2) Fuel temperature sensor (3) Atmospheric pressure sensor (4) Inlet manifold air temperature sensor (5) Engine oil pressure sensor | |
The engine coolant temperature is measured by an electronic sensor that is mounted on the water outlet housing. The signal for the engine coolant temperature sensor is used to modify the engine fueling and the signal is used to modify the engine timing. By modifying the engine fueling and the engine timing, the engine will improve the following conditions: cold start capability and white smoke cleanup. The ECM supplies the coolant temperature sensor with 5.0 ± .5 VDC. The sensor output voltage is 0.5 to 4.5 VDC. The sensor output voltage depends on the engine coolant temperature. Coolant temperature is used in order to indicate the Cold Mode Operation. Coolant temperature is also used for Engine Monitoring.
The fuel temperature is monitored in order to adjust the calculations for the fuel rate. The fuel temperature is monitored for the power correction when the fuel temperatures exceed
The atmospheric pressure sensor is an absolute pressure sensor that measures crankcase pressure. The atmospheric pressure sensor is used to calibrate the other pressure sensors on the engine. The values for these sensors that are communicated over the data link are calculated by subtracting the atmospheric pressure sensor reading. The atmospheric pressure sensor measures pressure from
Inlet Manifold Air Temperature Sensor
The sensor for the inlet manifold air temperature measures the temperature of the air in the inlet manifold. The Electronic Control Module (ECM) monitors the sensor signal for the inlet manifold air temperature. The output of the ECM can indicate high inlet manifold air temperature through a relay or a lamp. The sensor for the inlet manifold air temperature will not cause a shutdown of the engine or any horsepower change.
Note: The sensor will be affected by the heat that is conducted from the air in the inlet manifold when the engine is idling, and after the engine is shut off. This warm-up is due to the lack of coolant circulation through the engine. The reading from the sensor for the inlet manifold air temperature may be significantly higher than the actual temperature of the air inside the inlet manifold until the inlet manifold cools.
The engine oil pressure sensor is an absolute pressure sensor that measures engine oil pressure in the oil gallery. The engine oil pressure is communicated over the data link and the engine oil pressure is displayed by the service tools. The ECM uses the sensor input only if the parameter for the Engine Monitoring is programmed to one of the following functions:
- Warning Mode
- Derate Mode
- Shutdown Mode
The engine oil pressure sensor measures pressure from
The coolant level sensor is purchased by the OEM and the coolant level sensor is installed by the OEM. The coolant level sensor is the only optional sensor. The coolant level sensor is selected in the ECM Customer Programmable Parameter. The coolant level sensor is protected by a Customer Password.
Accelerator Pedal Position Sensor
The accelerator pedal position sensor is an electronic sensor that is connected to the accelerator pedal. The accelerator pedal position sensor sends a Pulse Width Modulated Signal to the ECM.