This Cummins 3361 troubleshooting document is a fault-code diagnostic procedure for abnormal intake manifold pressure response on CM2250 engines. It explains the circuit description, fault conditions, VGT actuator checks, aftertreatment inspection, ECM calibration review, and INSITE™ clearing process.
Official Cummins 3361 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, and GX CM2250 as listed in the procedure tables |
| System/Group | Intake Manifold 1 Pressure Circuit / DTCs |
| Publication no. | 4022250; 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 08-Dec-2010 |
| Pages | 14 |
| 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
- 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 VGT actuator.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
The extract identifies this procedure for Cummins ISX11.9 CM2250, ISX15 CM2250, and GX CM2250 engine applications in the associated procedure table. The opening circuit section labels the fault as “ISX11.9 CM2250/ISX15 CM2250 – Intake Manifold 1 Pressure Circuit,” and the diagnostic concerns Fault Code 3361, SPN 102, FMI 10/10. For official manufacturer resources, visit Cummins official website.
Who needs this Cummins 3361 troubleshooting manual
Workshop technicians need this Cummins 3361 troubleshooting manual when an amber CHECK ENGINE lamp or MIL is tied to Intake Manifold 1 Pressure – Abnormal Rate of Change. It is useful for mechanics checking a slow VGT actuator response, high exhaust restriction, aftertreatment damage, wiring connector condition, or ECM calibration level.
The procedure states that the ECM supplies a 5 volt circuit and sensor return to the intake manifold pressure sensor, then monitors the signal voltage to evaluate turbocharger performance. It lists possible reduced engine performance as the effect of Fault Code 3361 and notes that the diagnostic runs continuously when the engine is running. The guided checks use INSITE™ electronic service tool to confirm active fault codes, review related Fault Code 1938 or 2636, and verify anti-tampering sensitivity level before mechanical inspection.
Later steps cover VGT actuator connector pins, actuator drive gear damage, turbocharger shaft movement, sector gear gauge requirements, and output gear calibration. The document warns not to use pliers or other tools to rotate the VGT actuator gear because damage can occur. If the VGT actuator gear does not move when connected to the engine wiring harness, the procedure directs repeated disconnect and reconnect checks, manual rotation by hand, and replacement when required.
After the VGT checks, the procedure directs an aftertreatment initial check to test for a malfunctioning diesel particulate filter and progressive damage. The final steps review ECM Calibration Revision History, compare ECM code and revision number, calibrate if required, then operate the engine under the stated clearing conditions so the fault can become inactive.
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