This Cummins 3133 fault code document is a troubleshooting procedure for the aftertreatment diesel particulate filter outlet pressure sensor circuit. It explains the voltage-above-normal or short-to-high-source condition, the ECM response, and the diagnostic checks used with INSITE™ electronic service tool.
Official Cummins 3133 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 in the associated procedures table. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel particulate filter outlet pressure sensor circuit. |
| Publication no. | Not stated in the extract. Associated bulletin numbers include 4022254, 4022257, 4022250, 2883445, 4022256, and 4022255. |
| Year/Revision | Unknown; extract shows Last Modified: 11-Jun-2010 and 04-Jan-2011. |
| Pages | 15 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 3133 – Aftertreatment Diesel Particulate Filter Outlet Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
- 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 aftertreatment diesel particulate filter outlet pressure sensor and circuit
- Guided Step 3 – Check the ECM and OEM harness
- Guided Step 4B – Disable the fault code
Applicable truck models
This file applies to Cummins CM2250 engine diagnostic coverage shown in the extract, including ISB6.7 CM2250 and associated references for ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The component location note states that the aftertreatment diesel particulate filter outlet pressure sensor is mounted on the diesel particulate filter, with exact aftertreatment system location supplied by the OEM service manual. For manufacturer information, visit the Cummins official website.
Who needs this Cummins 3133 fault code manual
This manual is for diesel technicians, fleet maintenance staff, and workshop owners diagnosing an active or inactive aftertreatment diesel particulate filter outlet pressure sensor circuit fault. It is useful when checking Fault Code 3133, Fault Code 1695, Fault Code 3134, sensor supply voltage, return circuits, ECM connector pins, OEM harness opens, and pin-to-pin shorts.
The procedure states that the ECM supplies 5 volts and ground to the sensor, and the signal voltage changes with pressure at the diesel particulate filter outlet. Fault Code 3133 sets when the ECM detects the outlet pressure signal voltage greater than 4.75-VDC for more than 2 seconds. The documented effects include the amber CHECK ENGINE lamp or MIL, disabled active and stationary regeneration, closed EGR valve, and possible torque reduction if the engine is operated for an extended period with the fault active.
The guided checks cover connector condition, moisture, corrosion, bent pins, pushed-back pins, damaged seals, wire insulation damage, and connector lock damage. Electrical checks include 4.75 to 5.25-VDC supply measurement, less than 10 ohms for an OEM harness return circuit continuity check, and greater than 100k ohms for pin-to-pin short circuit checks on signal and supply wiring. The final steps include checking ECM calibration code information in INSITE™ and operating the engine under the stated clearing conditions.
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