GASKET 7N4945 - Caterpillar

System Operation Description:
Illustration 1 g00537438
System Schematic For Engine Oil Pressure Sensor (EOPS)
Illustration 2 g00686791
System Schematic For Engine Coolant Loss Sensor (ECLS)
Illustration 3 g00527377
System Schematic For Engine Coolant Temperature Sensor (ECTS)
Illustration 4 g00529671
System Schematic For Engine Oil Temperature Sensor (EOTS)
Illustration 5 g00288430
Pulse Width Modulated SignalThis test is provided in addition to the CID 100, CID 110 and CID 175 troubleshooting procedures. See Testing And Adjusting, "Troubleshooting Diagnostic Code". The pulse width modulated sensors are listed below.
oil pressure sensor
coolant temperature sensor
oil temperature sensorThese PWM sensors produce a digital signal. In a digital signal, the duty cycle varies as the condition changes. The frequency remains constant.
Table 1
Specifications for the Sensors    
Engine Oil Pressure Sensor (EOPS) (1)    
Pressure (kPa) (psi)    Voltage (Signal) (2)
DCV    Duty Cycle (Signal) (2)
%    
0 to 69 (0 to 10)     0.92 to 1.44     12.8 to 20.8    
69 to 138 (10 to 20)     1.44 to 1.92     20.8 to 28.1    
138 to 207 (20 to 30)     1.92 to 2.40     28.1 to 35.4    
207 to 276 (30 to 40)     2.40 to 2.89     35.4 to 42.6    
276 to 345 (40 to 50)     2.89 to 3.34     42.6 to 49.6    
345 to 414 (50 to 60)     3.34 to 3.89     49.6 to 56.6    
414 to 483 (60 to 70)     3.89 to 4.29     56.6 to 64.0    
483 to 552 (70 to 80)     4.29 to 4.74     64.0 to 70.5    
552 to 621 (80 to 90)     4.74 to 5.25     70.5 to 78.1    
621 to 690 (90 to 100)     5.25 to 5.74     78.1 to 85.0    
( 1 ) The base frequency is 350 to 650 Hz.
( 2 ) The voltages and currents are guidelines for troubleshooting. The voltages and currents should not be considered exact. Tolerance is 10%.
Table 2
Specifications for the Sensors    
Engine Coolant Temperature Sensor (ECTS) (1)
And
Engine Oil Temperature Sensor (EOTS) (1)    
Temperature (°C) (°F)    Signal Voltage (2) DCV     Duty Cycle (Signal)
(2) %    
-40 to -29 (-40 to -20)     1.18 to 1.23     10.0 to 10.6    
-29 to -18 (-20 to 0)     1.23 to 1.30     10.6 to 11.6    
-18 to -7 (0 to 20)     1.30 to 142     11.6 to 13.3    
-7 to 4 (20 to 40)     1.42 to 1.63     13.3 to 16.2    
4 to 16 (40 to 60)     1.63 to 1.97     16.2 to 21.1    
16 to 27 (60 to 80)     1.97 to 2.43     21.1 to 27.5    
27 to 38 (80 to 100)     2.43 to 3.00     27.5 to 35.6    
38 to 49 (100 to 120)     3.00 to 3.67     35.6 to 45.0    
49 to 60 (120 to 140)     3.67 to 4.35     45.0 to 54.7    
60 to 71 (140 to 160)     4.35 to 5.00     54.7 to 63.9    
71 to 82 (160 to 180)     5.00 to 5.58