HOSE 9Y4058 - Caterpillar

System Operation Description:Use this procedure to troubleshoot any suspect problems with the digital sensor supply.Use this procedure for the following diagnostic codes:
041-03 8 Volt DC Supply short to +batt
041-04 8 Volt DC Supply short to ground
535-08 Exhaust Temperature Sensor noisy signalThe digital sensor supply provides a regulated voltage of 8.0 0.4 VDC to the exhaust temperature sensor. The digital sensor supply is output short circuit protected. A short circuit to the battery should not cause permanent damage to the circuit inside the Electronic Control Module (ECM). The exhaust temperature sensor is not protected from overvoltage.
Illustration 1 g01057424
Illustration 2 g01057423
P1 ECM connector
(P1-4) 8 V digital supply
(P1-5) Digital return
(P1-68) Exhaust temperature sensor Test Step 1. Inspect Electrical Connectors and Wiring
Turn the Engine Control Switch (ECS) to the OFF/RESET position.
Thoroughly inspect the J1/P1 ECM connector and the J2/P2 ECM connector. Thoroughly inspect the connectors for each analog sensor. Refer to Troubleshooting, "Electrical Connectors - Inspect" 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 of 6.0 N m (55 lb in).
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 coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and/or of pinch points.Results:
OK - There are no problems with the wiring and/or the connectors. Proceed to Test Step 2.
Not OK - 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 the electronic service tool to the service tool connector.
Turn the ECS to the COOLDOWN/STOP position.
Monitor the active diagnostic code screen on the electronic