This document is a Cummins fault code 3733 troubleshooting procedure for the crankcase breather filter heater circuit. It explains the voltage above normal or shorted to high source condition, the amber CHECK ENGINE lamp response, and the guided diagnostic checks used with INSITE™ electronic service tool. The file is a 12-page PDF for workshop use when diagnosing this circuit fault.
Official Cummins fault code 3733 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250 and ISX15 CM2250 as shown in the procedure extract; file listing also references ISB6.7 CM2250 (2010-12) / DTCs. |
| System/Group | Crankcase Breather Filter Heater Circuit; DTCs |
| Publication no. | Associated procedure bulletin numbers shown: 4022250 for ISX15 CM2250 and 2883445 for ISX11.9 CM2250. |
| Year/Revision | Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 12 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- FAULT CODE 3733 – Crankcase Breather Filter Heater Circuit – Voltage Above Normal, or Shorted to High Source
- 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 crankcase breather heater and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This procedure applies to Cummins ISX11.9 CM2250 and ISX15 CM2250 engine coverage shown in the document extract, with associated references for the Electronic Control Module, ECM Calibration Code, and Engine Wiring Harness. The file listing identifies the library group as Cummins ISB6.7 CM2250 (2010-12) / DTCs, but the extracted troubleshooting pages name ISX11.9 CM2250 and ISX15 CM2250 for this crankcase breather heater circuit. For manufacturer information, visit Cummins official website.
Who needs this Cummins fault code 3733 manual
Mechanics, electrical diagnosticians, fleet maintenance staff, and workshop owners need this manual when an amber CHECK ENGINE lamp is linked to high signal voltage at the crankcase breather heater circuit. It supports inspection of connector pins, heater resistance, supply and return circuit continuity, pin-to-pin shorts, ECM calibration status, and final fault clearing with INSITE™ electronic service tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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