This Cummins fan control fault manual covers Fault Code 2377 diagnostics for the fan control circuit on Cummins ISB6.7 CM2150 engines. It explains the circuit description, code reason, fault effects, inspection checks, resistance tests, OEM harness checks, ECM checks, and clearing steps for Code 2377.pdf.
Official Cummins fan control fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL fan control circuit coverage |
| System/Group | DTCs; fan control circuit; Fault Code 2377 |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 14 |
| 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
- 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 fan control solenoid and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This document applies to Cummins ISB6.7 CM2150 (2007-09) engines in the DTCs group, with the extract also identifying ISB, ISC, and ISL fan control circuit diagnostics. The fan clutch solenoid location and parts of the fan control circuit vary by OEM, so the procedure directs technicians to use the appropriate OEM service literature, circuit diagram, or wiring diagram for connector pin identification and return-wire configuration. For official manufacturer information, visit Cummins official website.
Who needs this Cummins fan control fault manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins fan control fault manual when diagnosing an amber CHECK ENGINE light with SPN 647 FMI 3/3, where the fan may stay on continuously or not run at all. The procedure supports practical checks with INSITE™ electronic service tool and a multimeter before ECM replacement is considered.
The fault overview states that the ECM monitors voltage on the fan control circuit and expects approximately 0-VDC when the fan signal is commanded low. If high voltage is detected while the PWM signal is off, Fault Code 2377 is recorded. The diagnostic sections cover inactive code checks, fan control solenoid connector inspection, solenoid resistance below 10k ohms, diagnostic supply voltage above 5.0-VDC, return circuit resistance below 10 ohms, OEM harness continuity, and pin-to-pin short checks above 100k ohms. Repair actions include cleaning connector pins, repairing damaged harness wiring, replacing the fan control solenoid, repairing the OEM harness, or contacting a Cummins® Authorized Repair Location if all steps have been completed and checked again.
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