TERMINAL-BLADE 5P4571 - Caterpillar

System Operation Description: Use this procedure to troubleshoot the electrical system if a problem is suspected with the sensor or if any one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
Code and Description Conditions which Generate this Code System Response
110-3 Engine Coolant Temperature Sensor voltage above normal The engine's Electronic Control Module (ECM) detects signal voltage that is more than 4.95 VDC for eight seconds.
The ECM has been powered for at least two seconds. The code is logged if the engine has been running for more than seven minutes. The ECM uses the last valid engine coolant temperature. If the diagnostic code is active at start-up the ECM will use intake manifold temperature. If intake manifold air temperature is not valid, the ECM will default to 90 °C (194 °F) for engine coolant temperature. The ECM will activate the cooling fan after this code has been active for more than eight seconds.
110-4 Engine Coolant Temperature Sensor voltage below normal The ECM detects signal voltage that is less than 0.2 VDC for eight seconds.
The ECM has been powered for at least two seconds.
172-3 Intake Manifold Air Temperature Sensor voltage above normal The engine's ECM detects signal voltage that is more than 4.95 VDC for eight seconds.
The ECM has been powered for at least two seconds. The ECM will log the diagnostic code. The ECM will flag the intake manifold air temperature as invalid data and the intake manifold air temperature is set to a default value of 40 °C (104 °F).
172-4 Intake Manifold Air Temperature Sensor voltage below normal The ECM detects signal voltage that is less than 0.2 VDC for eight seconds.
The ECM has been powered for at least two seconds.
174-3 Fuel Temperature Sensor voltage above normal The engine's Electronic Control Module (ECM) detects signal voltage that is more than 4.95 VDC for eight seconds.
The ECM has been powered for at least two seconds. The code is logged. The ECM will flag the fuel temperature as invalid data and the fuel temperature is set to a default value of 40 °C (104 °F).
174-4 Fuel Temperature Sensor voltage below normal The ECM detects signal voltage that is less than 0.2 VDC for two seconds.
The ECM has been powered for at least two seconds.
175-3 Engine Oil Temperature Sensor voltage above normal The engine's Electronic Control Module (ECM) detects signal voltage that is more than 4.95 VDC for eight seconds.
The ECM has been powered for at least two seconds. The code is logged. The ECM will flag the oil temperature as invalid data and the oil temperature is set to the engine coolant temperature.
175-4 Engine Oil Temperature Sensor voltage below normal The ECM detects signal voltage that is less than 0.2 VDC for two seconds.
The ECM has been powered for at least two seconds. System OperationUse this procedure to troubleshoot any suspect problems with the following sensors:
Coolant temperature sensor
Intake manifold air temperature sensor
Fuel temperature sensorThe sensor signal for the passive sensor is routed from