This Code 1655 document covers Fault Code 1655 for an engine misfire condition detected on cylinder number 2. It explains the ECM misfire monitoring logic, amber lamp behavior, possible reduced engine performance, and the diagnostic path used to confirm or clear the fault.
Official Code 1655 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350, 2013-17 |
| System/Group | DTCs; Engine Misfire Cylinder 2 – Condition Exists |
| Publication no. | Fault Code: 1655; SPN: 1324; FMI: 11/31 |
| Year/Revision | Unknown; copyright 2017 in source extract |
| Pages | 5 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 1655
- PID; SPN: 1324; FMI: 11/31; LAMP: Amber
- ENGINE MISFIRE CYLINDER 2 – CONDITION EXISTS
- CIRCUIT DESCRIPTION
- COMPONENT LOCATION
- REASON
- EFFECT
- 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
- TROUBLESHOOTING STEPS
- Step 1A) Read the fault codes.
- Step 1B) Check for cylinder misfire.
- Step 2A) Perform the cylinder cutout test.
- Step 3A) Check if an ECM calibration update is available.
- Step 3B) Disable the fault code.
Applicable truck models
This file applies to Cummins ISB6.7 CM2350 engines in the 2013-17 coverage group where Fault Code 1655, SPN 1324, FMI 11/31 is used for Engine Misfire Cylinder 2 – Condition Exists. The extract does not identify a specific truck chassis, so use the engine and ECM calibration coverage rather than a vehicle model name when matching this PDF to a repair job. For manufacturer information, visit Cummins official website.
Who needs this Code 1655 manual
Mechanics, diesel diagnostic technicians, and workshop owners need this Code 1655 manual when a truck has an active or inactive 1655 fault, rough idle, smoke, engine stumble, low power, or a suspected cylinder 2 misfire. The procedure is useful for deciding whether to check fuel system faults first, run a cylinder cutout test, inspect injector and mechanical causes, or review ECM calibration revision history.
The PDF states that the ECM monitors engine speed as each injector fires and sets the fault when cylinder 2 contribution indicates a misfire. It lists possible causes such as valve lash out of specification, cylinder malfunction, valve malfunction, injector sealing washer issues, injector malfunction, cylinder head or gasket damage, extreme camshaft wear, and a mistimed air compressor. The repair flow also notes that inactive counts may be disregarded when no low power or misfire complaint exists, especially after an intermittent fuel system event such as air entering after a filter change. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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