This Cummins CM550 298 document covers Fault Code 298 for the OEM pressure sensor circuit on ISB CM550 applications. It explains the ECM use of OEM pressure input, the failed-low condition, connector checks, harness resistance tests, ECM response checks, and final fault-code clearing steps.
Official Cummins CM550 298 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; OEM Pressure Sensor Circuit |
| Year/Revision | Unknown |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 298
- PID: P223
- SPN: 1084
- FMI: 4
- OEM PRESSURE SENSOR CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: Inspect OEM harness and sensor connector pins
- Step 1B: Check the resistance of the OEM pressure sensor
- Step 2A: Inspect OEM harness and ECM connector pins
- Step 2B: Read the fault codes using the diagnostic tool
- Step 2C: Check for an open circuit in the OEM harness
- Step 2D: Check for a short circuit from the signal pin to all other pins
- Step 2E: Check for a short circuit to ground in the signal wire
- Step 3A: Check for appropriate ECM response
- Step 4A: Disable the fault code and verify Fault Code 298 is inactive
- Step 4B: Clear inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) diagnostic fault-code coverage where an OEM pressure sensor input is connected through the OEM harness and monitored by the ECM. The component location varies with the OEM, and the document directs users to the OEM manual for location and pressure sensor specifications. See the manufacturer information at Cummins official website.
Who needs this Cummins CM550 298 manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this fault code manual when Fault Code 298 is active or when checking an OEM pressure sensor circuit failed low. It supports pin inspection, resistance measurement, harness isolation, ECM response verification, and repair confirmation.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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