This Cummins CM550 376 document is a 2-page diagnostic procedure for Fault Code 376, PID P1691, covering VP44 fuel pump RPM and fuel error checks. It explains the rationality check between the engine electronic control module and the VP44 fuel pump control module, then gives step-based troubleshooting for active or inactive faults.
Official Cummins CM550 376 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; VP44 Fuel Pump |
| Publication no. | Fault Code 376; PID P1691 |
| Year/Revision | Unknown |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 376
- PID: P1691
- VP44 FUEL PUMP RPM AND FUEL ERROR
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Turn key switch ON and check to see if the fault code is active at engine start-up
- Step 2A) Turn key switch OFF and recalibrate the ECM with updated calibration code
- Step 3A) Turn key switch OFF and check for air in the fuel lines
- Step 4A) Turn key switch ON and compare rpm readings from different sources
- Step 5A) Connect all components, disable the fault code, road-test for 30 minutes, and verify Fault Code 376 is inactive
- Step 5B) Clear the inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) engine diagnostic work involving Fault Code 376, PID P1691, and the VP44 Fuel Pump. The extract identifies logic contained in the ECM and the VP44 fuel pump control module, with rpm comparison using a handheld tachometer and diagnostic tool monitor readings. For official manufacturer information, visit Cummins.
Who needs this Cummins CM550 376 manual
Mechanics, fleet technicians, and workshop owners need this VP44 fault code manual when diagnosing VP44 fuel pump RPM and fuel error complaints on covered ISB CM550 engines. It is useful when checking whether Fault Code 376 is active at start-up, recalibrating the ECM with updated calibration code, removing air from fuel lines, comparing tachometer rpm to VP44 fuel engine speed sensor readings, and confirming the repair with a 30-minute road test.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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