SUPPORT ASSEM. 7S0633 - Caterpillar

Use this procedure to troubleshoot the electrical system if a problem is suspected with a sensor supply. Use this procedure if any one of the diagnostic codes in Table 1 is active or easily repeated.Note: Some of the following codes may not be applicable for certain applications.Clear all "Active" codes using Cat ET before proceeding with the following procedure. Refer to Troubleshooting, "Diagnostic Capabilities - Clearing Active Codes for On Board Diagnostics (OBD)" for more information on clearing "Active" codes.
Table 1
CDL Code     J1939 Code     Code Description     Comments    
41-3     678-3     8 VDC Supply : Voltage Above Normal     The code is logged.    
41-4     678-4     8 VDC Supply : Voltage Below Normal     The code is logged.    
262-3     3509-3     5 Volt Sensor DC Power Supply : Voltage Above Normal     The code is logged.
All sensors are set to default values.    
262-4     3509-4     5 Volt Sensor DC Power Supply : Voltage Below Normal     The code is logged.
All sensors are set to default values.    
274-21     108-21     Atmospheric Pressure Sensor : Data Drifted Low     The code is logged.
The 5 VDC supply to the sensor has been lost.    
289-21     5578-21     Fuel Pressure Sensor - Before Fuel Filter : Data Drifted Low     The code is logged.
The 5 VDC supply to the sensor has been lost.    
460-21     5580-21     Fuel Pressure Sensor - After Fuel Filter : Data Drifted Low     The code is logged.
The 5 VDC supply to the sensor has been lost.    
1785-21     3563-21     Intake Manifold Pressure Sensor : Data Drifted Low     The code is logged.
The 5 VDC supply to the sensor has been lost.    
2131-3     3510-3     5 v Sensor DC Power Supply #2 : Voltage Above Normal     The code is logged.
Engine power may be derated.    
2131-4     3510-4     5 v Sensor DC Power Supply #2 : Voltage Below Normal     The code is logged.
Engine power may be derated.    
3385-21     3358-21 (1)     EGR Intake Pressure Sensor : Data Drifted Low     The code is logged.
The 5 VDC supply to the sensor has been lost.    
3464-21     3609-21     DPF #1 Intake Pressure Sensor : Data Drifted Low     The code is logged.
The 5 VDC supply to the sensor has been lost.    
3493-21     3837-21     Aftertreatment #1 Secondary Air Pressure Sensor : Data Drifted Low     The code is logged.
The 5 VDC supply to the sensor has been lost.    
( 1 ) This code cannot be cleared from the Cat ET "Logged" screen for 9600 hours after the code becomes logged.System OperationThe Electronic Control Module (ECM) supplies a regulated voltage of 5.0 0.2 VDC to the sensors.The supply voltage for the sensors is routed from the ECM to terminal 1 of each sensor connector. The sensor return for the sensors is routed from the ECM to terminal 2 of each sensor