This Cummins Fault 369 document is a 6-page troubleshooting PDF for a VP44 fuel pump to engine synchronization pulse not recognized condition. It explains the engine synchronization error circuit, the VP44 controller signal logic, likely wiring and grounding causes, and the step-by-step checks needed before clearing the fault.
Official Cummins Fault 369 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; VP44 fuel pump to engine synchronization pulse not recognized; Engine Synchronization Error Circuit |
| Publication no. | Not stated |
| Year/Revision | unknown; Copywrite 2017 shown in file extract |
| Pages | 6 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 369
- PID: P1690
- SPN: 1078
- FMI: 2
- VP44 FUEL PUMP TO ENGINE SYNCHRONIZATION PULSE NOT RECOGNIZED
- Engine Synchronization Error Circuit
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: Read fault codes using the diagnostic tool and check whether the fault is active at engine start-up
- Step 2A: Measure VP44 fuel pump supply voltage while cranking the engine
- Step 3A: Inspect VP44 connector pins using inspection tool, Part Number 3164980
- Step 4A: Check VP44 pump controller circuit resistance from pin 7 to pin 8
- Step 5A: Inspect and clean engine harness, fuel pump, ECM connector pins, fuses, and relay
- Step 6A through 6C: Check for open circuit, short circuit to ground, and short circuit from pin to pin
- Step 7A through 7B: Inspect engine speed sensor and check signal using breakout cable, Part Number 3824775
- Step 8A through 8E: Inspect engine, battery, chassis grounds, OEM power distribution, alternator, lift pump, and accessory electrical noise
- Step 9A through 9B: Disable, road-test, verify inactive status, and clear inactive fault codes
Applicable truck models
This file covers Cummins ISB CM550 (1990-94) diagnostic trouble code information for engines using the VP44 fuel pump and the engine speed/position sensor located on the fuel-pump side of the block, behind the starter. It applies to the fault condition where the VP44 pump controller does not recognize the engine synchronization reference pulse within the defined window, including checks for OEM wiring, grounding issues, loose or shorted wires, and electrical noise. For manufacturer information, visit Cummins official website.
Who needs this Cummins Fault 369 manual
Mechanics, diesel electrical specialists, and workshop owners need this manual when diagnosing active or logged Fault Code 369 on ISB CM550 applications. It is useful when verifying VP44 supply voltage, pump controller resistance, ECM-to-pump harness continuity, engine speed sensor signal, chassis grounds, lift pump interference, alternator-related noise, and final road-test confirmation.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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