This Cummins Fault Code 364 document is a troubleshooting manual for an ECM to pump communications error on the VP44 fuel pump circuit. It explains how the ECM and pump controller exchange fueling, timing, and pump status messages, and what to check when the datalink is lost.
Official Cummins Fault Code 364 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; VP44 Fuel Pump Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown |
| Pages | 6 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 364
- PID: P1689, S233
- SPN: 1077
- FMI: 9
- ELECTRONIC CONTROL MODULE (ECM) TO PUMP COMMUNICATIONS ERROR
- VP44 Fuel Pump Circuit
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: Check whether the fault code is active at engine start-up
- Step 2A: Measure supply voltage at pin 7 of the VP44 fuel pump harness connector
- Step 3A: Check VP44 connector pins using inspection tool, Part Number 3164980
- Step 4A: Install the VP44 fuel pump diagnostic tool, Part Number 3163834
- Step 5A: Remove alternator belt and check whether the fault returns
- Step 6A: Inspect ECM, fuel pump, connector pins, fuses, relay, and harness condition
- Step 7A to 7F: Check VP44 power, ground, datalink open circuit, short to ground, and pin-to-pin short
- Step 8A: Unplug the fuel lift pump and check whether the fault goes inactive
- Step 9A: Disable the fault code, road-test for 30 minutes, and verify repair
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) diagnostic troubleshooting for DTCs involving the VP44 fuel pump circuit. The extract identifies Fault Code 364, PID P1689 and S233, SPN 1077, and FMI 9, with checks for the ECM, VP44 fuel pump, engine harness, fuses, relay, battery connections, charging system, and fuel lift pump. See the manufacturer website at Cummins official site.
Who needs this Cummins Fault Code 364 manual
Workshop owners, diesel mechanics, and diagnostic technicians use this Fault Code 364 PDF when an ISB CM550 engine reports an ECM to pump communications error. The procedure supports circuit testing before replacing the VP44 injection pump, including voltage, resistance, connector inspection, load testing, and final road-test verification.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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