HARNESS AS- 3651924 - Caterpillar

TYPE="a" START="1">
Prepare to measure the voltage from RM-15 to the B- terminal of the relay module.
Turn the ECS to OFF/RESET and then turn the ECS to START.
At the relay module, measure the voltage from RM-15 to the B- terminal. Expected Result: The voltage should be 2.0 DCV of the system voltage that was previously measured in 3.Results:
OK - Therefore, there is an open circuit between RM-15 of the relay module and the fuel control solenoid. Repair the circuit. See the preceding System Schematic. STOP.
NOT OK - Voltage is low. Proceed to 8.
Troubleshoot the blown fuse.This test continues troubleshooting from 5. For reference, see the preceding System Schematics and Testing And Adjusting, "Schematics and Wiring Diagrams".
The ECS remains in the OFF/RESET position.
Remove the fuse that is blown.
If the blown fuse is "F2", measure the resistance from RM-15 of the relay module to ground (B-).
If the blown fuse is "F10", measure the resistance from RM-39 of the relay module to ground (B-).Expected Result: The resistance of the circuit should be less than 3 ohms for the circuit with the fuse that is blown.Results:
OK - Resistance is greater than 3 ohms and fuse is no longer blowing. Carefully check ALL wires that are connected to the appropriate terminal of the relay module for abrasion or worn spots in the insulation that could be causing the short. Check the wires in the panel and the generator panel. Also check the wires on the engine harness. Refer to the various wiring diagrams. Repair the wiring or replace wiring, if necessary. STOP.
NOT OK - If a resistance is less than 3 ohms, there is a short to ground (B-). (On some ETR fuel systems with a dual coil fuel control solenoid, the correct normal resistance can measure less than 1 ohm.) Remove one component or wire at a time that is in series with the load side of the fuse terminal. Remove a component or wire until the faulty component or wire is isolated. Repair the faulty component or wiring. If necessary, replace the faulty component or wiring. STOP.
NOT OK - If a resistance is greater than 3 ohms and the fuse still blows when all wires are removed from the appropriate terminal, replace the relay module. See Testing And Adjusting, "Relay Module - Replace". STOP.
Check the condition of the low voltage.This test continues troubleshooting from 6. Fuse "F4" remains removed from the relay module. For reference, see the "Generator Set Wiring Diagram" in the Testing And Adjusting, "Schematics & Wiring Diagrams". Prepare to make voltage measurements at the relay module.
Turn the ECS to OFF/RESET and then turn the ECS to START.
At the relay module, measure the voltage from RM-4 to the B- terminal and from RM-31 to the B- terminal.Expected Result: The voltage should be 2.0 DCV of the system voltage that was measured previously in 3.Results:
OK - Proceed to 9.
NOT OK - Voltage is NOT correct. Check the wiring and recheck the fuse "F2". STOP.
Check that the diagnostic code exists.
Make