This Cummins 517 troubleshooting document is a 6-page fault code procedure for a VP44 fuel pump valve feedback error on Cummins ISB CM550 DTC coverage. It explains when Fault Code 517 is detected, where the VP44 fuel pump is located, and how to test the related fuel, wiring, ground, alternator, lift pump, and OEM harness circuits.
Official Cummins 517 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 |
| System/Group | DTCs; VP44 fuel pump |
| Publication no. | Not specified in the extract |
| Year/Revision | Unknown; document copywrite 2017 |
| Pages | 6 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 517
- PID: P0252
- VP44 FUEL PUMP VALVE FEEDBACK ERROR
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: check if fault code is active at engine start-up
- Step 2A: measure supply voltage to the fuel pump while cranking
- Step 3A: inspect the fuel drain line and return restriction
- Step 4A: use VP44 fuel pump diagnostic tool Part Number 3163834
- Step 5A through 5C: inspect connectors, supply resistance, and ground circuit resistance
- Step 6A: inspect fuel pump solenoid wire leads
- Step 7A through 7F: inspect grounds, OEM power distribution, alternator, lift pump, key switch input, and accessory interference
- Step 8A through 8B: disable, road test, verify inactive code, and clear inactive fault codes
Applicable truck models
This file applies to Cummins ISB CM550 engines in the DTC group where Fault Code 517, PID P0252, is used for the VP44 fuel pump valve feedback error. The extract does not identify a truck make, chassis model, engine year, or vehicle application beyond ISB CM550 coverage and the VP44 fuel pump located on the backside of the gear housing. For manufacturer information, visit Cummins official website.
Who needs this Cummins 517 troubleshooting manual
Workshop technicians need this Cummins 517 troubleshooting manual when diagnosing an active or inactive Fault Code 517, especially where Fault Code 363, voltage feedback on a ground loop, electrical noise, or high fuel return line restriction may also be involved. It is useful for shops checking VP44 pump supply voltage, return pressure, connector condition, ECM and engine harness circuits, lift pump resistance, alternator output, and key switch input voltage before replacing parts.
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