PLATE 4756157 - Caterpillar

Illustration 1 g00326429
Coolant temperature sensor (1) Connectors to module for pressure and for temperature.The resistance value of the sensor corresponds to the surrounding temperature. This test will require the sensor to be at room temperature.
Disconnect connectors (1) from the engine harness.
There is one electrical connection in each connector (1). Measure the resistance between connectors (1). Make sure that good contact is made between the connector pins.
Compare the measured resistance with the resistance that is listed in the following chart:
If the resistance values do not agree, check connectors (1) and repair any faulty connections. If connectors are okay, replace the coolant temperature sensor.
If the resistance values agree, check the connectors for the pressure sensor and the temperature sensor at the module. If the connectors are okay, replace the module.
Table 1
Room Temperature     Resistance    
°C (°F)     ohms    
20 (68)     12,215 to 12,780    
21 (70)     11,680 to 12,215    
22 (72)     11,170 to 11,680    
23 (74)     10,685 to 11,170