SOCKET-CONNECTOR 8N1541 - Caterpillar

System Operation Description:Use this procedure if one of the following diagnostic codes is active or logged:
263-03 Digital Sensor Supply short to +batt
263-04 Digital Sensor Supply short to groundThe digital sensor supply in the Electronic Control Module (ECM) supplies 8.0 0.4 VDC to terminal A of the digital sensors. Terminal B of the digital sensors is connected to the digital return.The digital sensor supply is output short circuit protected. The ECM is protected from a short to ground and a short to +Battery condition. The digital sensor is not protected against short circuits.
Illustration 1 g01162020
Schematic
Illustration 2 g01162303
P1 ECM connector
(P1-4) +8 V digital supply
(P1-5) Digital return
Illustration 3 g01162233
P2 ECM connector
(P2-56) +8 V digital supply
Illustration 4 g01094844
Sensor connector
Test Step 1. Inspect Electrical Connectors and Wiring
Turn the engine control to the OFF/RESET mode.
Turn the battery disconnect switch to the OFF position.
Thoroughly inspect the J1/P1 and J1/P1 ECM connectors. Thoroughly inspect all connectors that are related to the circuit. Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the sensor connectors that are associated with the active diagnostic code.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.
Check the harness and wiring for abrasions and for pinch points from the sensors back to the ECM. Expected Result:All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasion, and of pinch points. All connections and grounds are tight and free of corrosion.Results:
OK - The harness and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check for Active Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the engine control to the STOP mode.
Turn the battery disconnect switch to the ON position.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes. Note: Wait at least 15 seconds in order for the diagnostic codes to become active.Expected Result:One of the following diagnostic codes is active:
263-03
263-04 Results:
OK - A 263-03 diagnostic code is active. Proceed to Test Step 3.
OK - A 263-04 diagnostic code is active. Proceed to Test Step 4.
Not OK - No diagnostic code for the digital supply is active. A problem is suspected with a sensor output signal. In order to verify that the sensor is receiving the correct supply voltage, proceed to Test Step 3.Test Step 3. Check the Voltage on the +8 V Supply Wire
Turn the engine control to the OFF/RESET mode.
Turn the battery disconnect switch to the OFF position.
Disconnect all of the digital sensors at the sensor connectors.
Turn the engine control to the STOP mode.
Turn the battery disconnect switch to the ON position.
Measure the