CAP-BEARING 9J6062 - 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    
41-3 8 Volt DC Supply voltage above normal     The digital sensor supply voltage is above normal for one second.     The code is logged.
All sensors are set to default values.    
41-4 8 Volt DC Supply voltage below normal     The digital sensor supply voltage is below normal for one second.    
262-3 5 Volt Sensor DC Power Supply voltage above normal     The analog sensor supply voltage is above normal for one second.     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 one second.    
269-3 Sensor Power Supply voltage above normal     The analog sensor supply voltage is above normal for one second.     The code is logged.
All sensors are set to default values.    
269-4 Sensor Power Supply voltage below normal     The analog sensor supply voltage is below normal for one second.    Note: The 262 diagnostic codes indicate a problem with the 5 V power supply on the J2 ECM connector. The 269 diagnostic codes indicate a problem with the 5 V power supply on the J1 ECM connector.System OperationThe Electronic Control Module (ECM) supplies a regulated voltage of 5.0 0.2 VDC to the following sensors:
Atmospheric pressure sensor
Engine oil pressure sensor
Fuel pressure sensors
Intake manifold pressure sensor
Left track accumulator pressure sensor
Right track accumulator pressure sensor The ECM supplies a regulated voltage of 8.0 0.4 VDC to the following sensors:
Accelerator throttle position sensor
Decelerator throttle position sensorThe supply voltage for the sensors is routed from the ECM to terminal A of each sensor connector. The sensor return for the sensors is routed from the ECM to terminal B of each sensor connector. The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.Note: The sensors are not protected from overvoltage. A short from the supply line to the +Battery may damage the sensors. If any of the 3 diagnostic codes are active, it is possible that a sensor has been damaged. Repair the sensor supply and check for any active sensor diagnostic codes in order to determine if a sensor has failed.
Illustration 1 g01382442
Schematic for the sensor supply circuitsTest Step 1. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the ECM.
Illustration 2 g01381901
Locations of the components for the active analog sensors (typical left side engine view) (1) Intake manifold pressure sensor (2) Fuel pressure sensor (3) Atmospheric pressure sensor (4) Engine oil pressure sensor (5) J2/P2 ECM connectors (6) J1 ECM connector
Thoroughly inspect the connectors for sensors (1), (2), (3), and (4). Also,