This Cummins 368 troubleshooting document is a 4-page diagnostic procedure for Fault Code 368 on ISB CM550 applications. It identifies the fault as VP44 fuel pump cannot reach commanded timing and gives step-by-step checks for fuel restriction, fuel pressure, air in fuel, return plumbing, gear timing, and final road-test verification.
Official Cummins 368 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; VP44 Fuel Pump Circuit |
| Publication no. | Not stated in extract |
| Year/Revision | Unknown |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 368
- PID: P0216, S254
- SPN: 1078
- FMI: 8
- VP44 fuel pump can not reach commanded timing
- VP44 Fuel Pump Circuit
- Description
- Component Location
- Troubleshooting Steps
- Step 1A: check whether Fault Code 368 is active at engine start-up
- Step 2A through 2E: lift pump inlet restriction, fuel filter inlet pressure, air in fuel, fuel volume, and lift pump voltage supply
- Step 3A through 3C: loaded engine checks for inlet restriction, air in fuel, and fuel pressure at the fuel filter outlet
- Step 4A: overflow valve inspection
- Step 5A: drain line pressure check
- Step 6A and 6B: fuel pump gear, gear key, timing marks, and key installation checks
- Step 7A and 7B: disable fault code, road-test, replace VP44 Injection Pump if required, and clear inactive fault codes
Applicable truck models
This file applies to Cummins ISB CM550 engines from the 1990-94 group where Fault Code 368 is logged for a VP44 fuel pump timing issue. The extract does not list specific truck makes or chassis models, so application should be confirmed by engine model, ECM group, and diagnostic code data. For manufacturer information, visit the Cummins official website.
Who needs this Cummins 368 troubleshooting manual
Workshop owners, diesel technicians, and mobile mechanics need this Cummins 368 troubleshooting manual when diagnosing VP44 timing faults, low-pressure fuel supply problems, return restrictions, or possible engine position pulse signal noise. The procedure is useful when a diagnostic tool shows SPN 1078 FMI 8 or PID P0216/S254 and the technician must decide whether to correct plumbing, lift pump supply, gear timing, or replace the VP44 Injection Pump.
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