This Cummins VP44 fault document is a 4-page troubleshooting sheet for Cummins Fault Code 372 on the ISB CM550 engine group. It covers the Idle Select High/Low fuel pump circuit, including diagnostic checks for the VP44 fuel pump, ECM connectors, engine harness, fuses, relay, voltage, resistance, opens, shorts, and final fault-code clearing.
Official Cummins VP44 fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Fault Code 372; Idle Select High/Low fuel pump circuit |
| Publication no. | Not specified in the extract |
| Year/Revision | Unknown |
| Pages | 4 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 372
- PID: P1283, S233
- SPN: 1077
- FMI: 11
- Idle Select High/Low
- 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 to the VP44 fuel pump while cranking
- Step 2B: check the idle speed select circuit resistance
- Step 3A: install VP44 fuel pump diagnostic tool, Part Number 3163834
- Step 4A: inspect engine harness, fuel pump, ECM connector pins, fuses, and relay
- Step 5A: check for an open circuit
- Step 5B: check for a short circuit from pin to pin
- Step 5C: check for a short circuit to ground
- Step 6A: disable the fault code and verify Fault Code 372 is inactive
- Step 6B: clear inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 engines in the 1990-94 group, as identified in the document metadata. The extract does not list specific truck makes or chassis models, so application should be confirmed by the engine control system, VP44 fuel pump, and active Cummins Fault Code 372 before using the procedure. For current manufacturer information, visit Cummins official website.
Who needs this Cummins VP44 fault manual
Workshop technicians, diesel mechanics, and fleet maintenance staff need this Cummins VP44 fault manual when diagnosing a limp-home acceleration complaint related to the Idle Select High/Low circuit. The procedure supports checks of battery voltage during cranking, 5k to 7k ohms resistance at the pump pins, connector damage, harness continuity, pin-to-pin shorts, shorts to engine block ground, and final verification with a diagnostic tool.
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