This code 451 DTCs document is a troubleshooting PDF for the Injector Metering Rail 1 Pressure Sensor Circuit. It explains the high-voltage fault condition, ECM response, INSITE™ checks, connector inspections, circuit tests, calibration review, and fault clearing steps for the fuel rail pressure sensor circuit.
Official code 451 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated procedure coverage listing ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISD4.5, ISD6.7 CM2220, ISL8.9 CM2150, and ISZ13 CM2150 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Injector Metering Rail 1 Pressure Sensor Circuit |
| Publication no. | Not specified for the PDF; associated ISB6.7 CM2250 bulletin number 4022254 is listed |
| Year/Revision | Unknown; pages show Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 18 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- FAULT CODE 451
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Guided Step 1 – Check the fault codes.
- Guided Step 2C – Check the sensor supply voltage and return circuit.
- Guided Step 3A-1 – Check the ECM response.
- Guided Step 4B – Disable the fault code.
Applicable truck models
This file is centered on ISB6.7 CM2250 diagnostics for Fault Code 451, SPN 157 FMI 3, where the ECM detects fuel rail pressure signal voltage greater than 4.75-VDC for more than 3 seconds. The associated procedures table also references ECM, ECM Calibration Code, and Engine Wiring Harness procedures for multiple Cummins engine platforms, including ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. For manufacturer information, visit Cummins official website.
Who needs this code 451 DTCs manual
Workshop owners, diesel technicians, and fleet mechanics need this code 451 DTCs manual when diagnosing an amber CHECK ENGINE light, MIL behavior on OBD engines, derate complaints, disabled active or stationary regeneration, or EGR valve closure linked to the fuel rail pressure sensor circuit. The procedure supports checks for a short to high source, open signal wire, open 5 Volt supply wire, open return wire, malfunctioning sensor, malfunctioning ECM, dirty pins, corroded pins, bent pins, moisture, damaged connector seals, and harness faults.
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