fault code 442 DTCs is a troubleshooting document for the ISB CM550 unswitched battery supply circuit. It explains the ECM battery input circuit, related fuses, battery return wiring, connector checks, alternator inspection, and final fault-code clearing steps. The file is a 3-page PDF intended for diagnostic use on the covered Cummins engine platform.
Official fault code 442 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; unswitched battery supply circuit |
| Publication no. | Not specified in the extract |
| Year/Revision | Unknown; source page marked Copywrite 2017 |
| Pages | 3 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 442
- PID: P168
- SPN: 168
- FMI: 0
- UNSWITCHED BATTERY SUPPLY CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Turn key switch OFF and disconnect all aftermarket devices from the battery supply circuit.
- Step 1B) Turn key switch OFF and disconnect all aftermarket devices from the battery supply circuit.
- Step 1C) Turn key switch OFF and inspect the alternator for normal operation.
- Step 2A) Connect all components. Turn key switch ON and disable the fault code.
- Step 2B) Connect all components, turn key switch ON and clear inactive fault codes using the diagnostic tool.
Applicable truck models
This document covers Cummins ISB CM550 (1990-94) diagnostic trouble code information for Fault Code 442, PID P168, SPN 168, FMI 0. The extract identifies the ECM, engine harness, battery supply circuit, 23-pin Deutsch connector, 23-pin OEM connector, battery positive and return wiring, in-line 10-amp fuses, 7.5-amp fuses, and alternator operation, but it does not list a specific truck make or chassis model. Battery location is stated to vary by original equipment manufacturer, and the document directs users to the OEM manual for battery location details. For manufacturer information, see the Cummins official website.
Who needs this fault code 442 DTCs manual
Mechanics, diesel technicians, and workshop owners need this manual when diagnosing an active or inactive unswitched battery supply circuit fault on the covered ISB CM550 engine control system. It is most useful when checking battery voltage, battery ground resistance, fuse sizing, aftermarket battery-circuit devices, alternator function, and remaining active fault codes with a diagnostic tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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