This Cummins 2555 troubleshooting manual covers Fault Code 2555 for the engine intake air heater 1 circuit. It explains the voltage above normal or shorted to high source condition, the amber lamp response, INSITE™ checks, relay circuit tests, OEM harness tests, ECM calibration review, and fault clearing steps.
Official Cummins 2555 troubleshooting manual document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISC8.3 and ISL9 CM2250 in the fault title and associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Intake Air Heater 1 Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 20-Jul-2010 |
| Pages | 15 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 2555
- 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 intake air heater relay and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2250 fault diagnostics for SPN 729 FMI 3, where high voltage is detected at the intake air heater signal circuit. The extract also names ISC8.3 and ISL9 CM2250 in the intake air heater 1 circuit heading, and the associated procedures table lists related ECM and ECM calibration references for ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISB6.7, ISD4.5, ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The procedure is centered on the intake air heater relay signal and return circuits, including 12 volt systems with two relays and 24 volt systems with one relay. Official manufacturer information is available from Cummins.
Who needs this Cummins 2555 troubleshooting manual
Workshop owners, diesel mechanics, and electrical diagnostic technicians need this document when an ISB6.7 CM2250 logs Fault Code 2555 and the intake air heater can be on or off all the time. The Cummins 2555 troubleshooting manual is useful for checking inactive faults, inspecting relay and ECM connector pins, measuring resistance below 10 ohms, checking diagnostic voltage above 3.75-VDC, testing for shorts above 100k ohms, reviewing ECM calibration, and clearing the code with INSITE™.
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