This Cummins fault code 298 document is a troubleshooting procedure for the Auxiliary Pressure Sensor Input 1 Circuit voltage below normal or shorted to low source condition. It explains the circuit description, possible causes, guided diagnostic steps, INSITE™ checks, connector inspection, voltage checks, resistance checks, and fault clearing actions. The file is a 15-page PDF intended for service work on covered Cummins electronic engine applications.
Official Cummins fault code 298 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also identifies FAULT CODE 298 (QSC3.3) |
| System/Group | DTCs; Auxiliary Pressure Sensor Input 1 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
- Component Location
- Shop Talk
- FAULT CODE 298 (QSC3.3)
- Possible causes of this fault code
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the OEM pressure sensor and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4B – Clear the fault codes.
Applicable truck models
This PDF applies to Cummins electronic engine installations where the OEM has wired a pressure sensor input to the ECM and the calibration is created to recognize that input. The file information lists Cummins ISB6.7 CM2150 (2007-09), while the extracted procedure title also names FAULT CODE 298 (QSC3.3); the OEM pressure sensor location varies by application, so the OEM troubleshooting and repair manual is still required for sensor location and connector identification. For manufacturer service information and support, visit Cummins official website.
Who needs this Cummins fault code 298 manual
Workshop owners, diesel mechanics, and electrical diagnostic technicians need this Cummins fault code 298 manual when an amber lamp and SPN 1388 FMI 4 point to low signal voltage or an open circuit in the OEM pressure circuit. It is useful when checking Fault Code 352, verifying 4.75 to 5.25 VDC sensor supply, testing circuit response with INSITE™ electronic service tool, and deciding whether the issue is a sensor, connector, OEM harness, or ECM concern.
The troubleshooting sequence focuses on practical shop checks. It instructs the technician to inspect loose connectors, corroded pins, bent or broken pins, pushed back or expanded pins, moisture, damaged seals, dirt, wire insulation damage, broken connector shells, and damaged locking tabs. It also covers resistance measurements for open RETURN and SIGNAL circuits, pin-to-pin shorts, and pin-to-ground shorts, with expected values of less than 10 ohms for continuity and greater than 100K ohms for short checks. Repair direction in the extract points to OEM Wiring Harness Procedure 019-071, Component Connector and Pin Inspection Procedure 019-361, Resistance Measurements Using a Multimeter Procedure 019-360, ECM Calibration Code Procedure 019-032, and Electronic Control Module Procedure 019-031 when authorization is required.
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