This Cummins ISB fault 452 document is a troubleshooting procedure for the injector metering rail number 1 pressure sensor circuit on CM2150 engines. It covers the fuel rail pressure sensor circuit, ECM checks, INSITE™ fault-code verification, calibration review, and fault clearing steps for Code 452.
Official Cummins ISB fault 452 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB with CM2150; ISB6.7 CM2150 (2007-09) group reference |
| System/Group | DTCs; Fuel Rail Pressure Sensor Circuit |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 15 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Fault Code 452: Injector Metering Rail Number 1 Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
- 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
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the rail fuel pressure sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins ISB engines with CM2150 control, including the ISB6.7 CM2150 (2007-09) DTC group shown in the file information. The extract also references ISC and ISL with CM2150 for the same fuel rail pressure sensor circuit, but the listed coverage for this library item is Cummins ISB6.7 CM2150. For manufacturer information, visit Cummins official website.
Who needs this Cummins ISB fault 452 manual
Workshop owners, diesel technicians, and fleet mechanics use this manual when diagnosing an amber CHECK ENGINE light, power or speed derate, and SPN 157 FMI 4 related to low signal voltage at the rail fuel pressure sensor circuit.
The procedure explains how the ECM supplies 5 volts and sensor return, how the fuel rail pressure sensor signal changes with rail pressure, and how to inspect connectors for loose pins, corrosion, moisture, damaged seals, dirt, broken shells, insulation damage, and locking-tab issues. It also lists checks using INSITE™ electronic service tool, including Fault Code 187 sensor supply checks, inactive Fault Code 452 verification, circuit response checks involving Fault Code 451, and 4.75 to 5.25-VDC supply and return testing. Later steps cover ECM and engine harness connector inspection, possible engine harness repair or replacement, ECM replacement authorization, ECM calibration revision review through QuickServe™ Online, and clearing inactive fault codes after operating the engine under the stated clearing conditions.
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