This VP44 fault code DTCs document covers Fault Code 365 for the VP44 fuel pump circuit on Cummins ISB CM550 engines. It explains the low voltage out-of-range condition, the ECM relay power path, the fuel pump control module comparison of battery voltage to supply voltage, and the diagnostic checks shown in the PDF.
Official VP44 fault code DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; VP44 Fuel Pump Circuit |
| Publication no. | Not listed |
| Year/Revision | Unknown; extract shows Copywrite 2017 |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 365
- PID: S233
- SPN: 1077
- FMI: 4
- FUEL PUMP VOLTAGE OUT OF RANGE ERROR LOW
- VP44 Fuel Pump Circuit
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Connector and harness inspection
- Step 1B) VP44 supply resistance check
- Step 1C) VP44 controller ground circuit open-circuit check
- Step 2A) Battery voltage check during key-off and cranking
- Step 2B) Alternator output check
- Step 3A) Disable the fault code and verify inactive status
- Step 3B) Clear inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) coverage where Fault Code 365 is used for the VP44 Fuel Pump Circuit. The extract identifies the component location as internal to the VP44 pump and gives circuit checks at the ECM connector, VP44 connector, fuel pump control module connector, battery terminals, engine block ground, and alternator output; it does not name specific truck makes or chassis models. For current manufacturer information, see Cummins official site.
Who needs this VP44 fault code DTCs manual
Workshop technicians, diesel mechanics, and fleet repair owners need this fault code DTCs manual when diagnosing SPN 1077 FMI 4, fuel pump supply resistance, controller ground resistance, battery voltage under cranking, or alternator output before clearing inactive codes. It is useful when a shop needs the short step-by-step fault path instead of a full engine service manual.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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