NUT 9R2828 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with a sensor supply 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    
262-3 5 Volt Sensor DC Power Supply : Voltage Above Normal     The analog sensor supply voltage is above normal for two seconds.     The code is logged.
All sensors are set to default values.    
262-4 5 Volt Sensor DC Power Supply : Voltage Below Normal     The analog sensor supply voltage is below normal for two seconds.    
263-3 Digital Sensor Power Supply (8V Or 12V) : Voltage Above Normal     The digital sensor supply voltage is above normal for two seconds.    
263-4 Digital Sensor Power Supply (8V Or 12V) : Voltage Below Normal     The digital sensor supply voltage is below normal for two seconds.    System OperationThe Electronic Control Module (ECM) supplies a regulated voltage of 5.0 0.2 VDC to the following sensors:
Aftercooler temperature sensor
Atmospheric pressure sensor
Coolant pressure sensor
Coolant temperature sensor
Crankcase pressure sensor
Filtered engine oil pressure sensor
Filtered fuel pressure sensor
Turbocharger outlet pressure sensor
Left turbocharger inlet pressure sensor
Right turbocharger inlet pressure sensor
Unfiltered engine oil pressure sensor
Unfiltered fuel pressure sensorBoth the primary ECM and the secondary