This Cummins ISB6.7 297 document covers Fault Code 297 diagnostics for an auxiliary pressure sensor input circuit with voltage above normal or shorted to a high source. It outlines the circuit description, OEM sensor location notes, possible causes, INSITE™ checks, connector inspections, harness resistance tests, and final fault-code clearing steps.
Official Cummins ISB6.7 297 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also identifies FAULT CODE 297 (QSB3.3) |
| System/Group | DTCs; Auxiliary Pressure Sensor Input 1 Circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 14 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Shop Talk
- FAULT CODE 297 (QSB3.3)
- Auxiliary Pressure Sensor Input 1 Circuit – Voltage Above Normal or Shorted to High Source
- 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 4 – Clear the fault code.
Applicable truck models
This file applies to Cummins engines and OEM installations where a pressure sensor input is wired to the Cummins electronic control module and the ECM calibration recognizes that input. The file information lists ISB6.7 CM2150 (2007-09), while the extracted diagnostic heading states FAULT CODE 297 (QSB3.3), so users should confirm engine family, OEM wiring, and calibration in QuickServe® Online before applying the procedure. Reference the manufacturer through Cummins official website.
Who needs this Cummins ISB6.7 297 manual
This Cummins ISB6.7 297 manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing an amber-lamp Fault Code 297 with INSITE™ electronic service tool and a multimeter. It is most useful when checking sensor supply voltage, return-circuit continuity, connector condition, ECM connector pins, and OEM harness shorts.
The diagnostic routine starts by checking for sensor supply or multiple fault codes, including Fault Code 386, then moves to the OEM pressure sensor connector. It describes inspection points such as loose connectors, corroded pins, bent or broken pins, pushed-back or expanded pins, moisture, missing seals, debris, wire insulation damage, broken connector shells, and damaged locking tabs. The circuit response check expects Fault Code 298 active and Fault Code 297 inactive after the sensor is disconnected and the keyswitch is on. Voltage between the OEM Pressure +5 volt SUPPLY pin and OEM pressure RETURN pin is specified as 4.75 to 5.25 VDC.
For harness diagnosis, the procedure disconnects the OEM harness from the ECM connector and the OEM pressure sensor from the harness. It checks the return circuit for less than 10 ohms, then checks for pin-to-pin shorts with resistance greater than 100K ohms. If the harness and connectors pass but Fault Code 297 remains active, the document directs the technician to call for authorization before ECM replacement. The final steps start the engine, idle it for 1 minute, verify the code is inactive, and clear inactive fault codes with INSITE™.
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