This Cummins aftertreatment doser document is a troubleshooting procedure for Fault Code 1977 on the aftertreatment fuel injector circuit. It explains the circuit description, fault effects, diagnostic conditions, connector and resistance checks, harness tests, ECM calibration review, and fault clearing with INSITE™ electronic service tool.
Official Cummins aftertreatment doser document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, GX CM2250; file group listed as ISB6.7 CM2250 (2010-12) / DTCs |
| System/Group | Aftertreatment Fuel Injector Circuit; DTCs; Fault Code 1977 |
| Publication no. | Associated bulletin numbers 4022250 and 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010 and 27-Dec-2010 |
| Pages | 15 |
| File size | 0.3 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 1977 – Aftertreatment Doser Circuit – Current Below Normal or Open Circuit
- 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 fuel injector and circuit
- Guided Step 3 – Check the ECM and engine harness
- 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 engines, with the file grouping also referencing ISB6.7 CM2250 (2010-12) DTCs. The fault concerns the aftertreatment fuel injector installed in the exhaust system in the turbocharger outlet flange, where the ECM controls injection using a pulse width modulated signal. See the manufacturer source at Cummins official website.
Who needs this Cummins aftertreatment doser manual
Workshop owners, diesel mechanics, and diagnostic technicians use this Cummins aftertreatment doser manual when Fault Code 1977 is active or inactive and active diesel particulate filter regeneration is disabled. It is most useful when checking an open circuit, short to ground, short to voltage source, high resistance, low solenoid resistance, damaged connector pins, wiring harness faults, ECM issues, or calibration status.
The guided procedure gives measured decision points rather than general advice. It lists aftertreatment fuel injector resistance of .5 to 2.0 ohms, harness circuit resistance under 10 ohms, and short-circuit checks greater than 100k ohms where shown in the diagnostic steps. The document also references Procedure 011-042 for the aftertreatment fuel injector, Procedure 019-031 for the Electronic Control Module, Procedure 019-032 for ECM Calibration Code, Procedure 019-043 for Engine Wiring Harness, Procedure 019-360 for resistance measurement techniques, and Procedure 019-361 for general inspection techniques.
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