This Cummins ISB fault 442 document is a diagnostic procedure for Battery 1 Voltage above normal operational range on CM2150 engines. It explains the unswitched battery supply circuit, ECM power inputs, conditions for setting and clearing the code, and guided checks using INSITE™. The file is a 7-page English PDF for workshop reference.
Official Cummins ISB fault 442 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; Unswitched Battery Supply Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 7 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- 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 equipment battery system.
- Guided Step 3 – Clear the fault codes.
Applicable truck models
This document applies to Cummins ISB6.7 CM2150 engines from the 2007-09 group and specifically covers Fault Code 442, PID P168, SPN 168, and FMI 0/16. The extract also names ISB, ISC, and ISL with CM2150 in relation to the unswitched battery supply circuit. The ECM is described as being on the intake side of the engine and connected to the battery through the OEM harness, while battery location varies by OEM. For manufacturer information, visit Cummins official website.
Who needs this Cummins ISB fault 442 manual
Workshop owners, diesel mechanics, and electrical diagnostic technicians need this Cummins ISB fault 442 manual when an amber lamp is present and the ECM reports Battery 1 Voltage above the maximum system voltage level. It is useful for checking whether the fault comes from an overcharging alternator or regulator, batteries connected in series instead of parallel, incorrect jump-starting, or OEM wiring issues.
The procedure directs the technician to read fault codes with the INSITE™ electronic service tool, check battery voltage at ECM battery SUPPLY (+) pins to engine block ground, verify the alternator charging rate with an OEM ammeter or installed ammeter, and then disable and clear inactive fault codes. The stated diagnostic limit is that the ECM detects main battery supply voltage greater than 36-VDC, with repair paths referring to the OEM troubleshooting and repair manual where battery system installation, alternator repair, regulator replacement, or alternator wiring repair is required.
Full PDF available in the DiagTechPro manuals library, free account required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Cummins Calterm Version 5.16 – Advanced ECM Control and Precision Tuning for Cummins Engines
Cummins INSITE 9.3 – The Essential Diagnostic Tool for Cummins Engines
Cummins InCal CE – The Calibration and Configuration Tool for Cummins Engines
