This control fault DTCs document is a troubleshooting procedure for Fault Code 245 on CM2250 engine fan control circuits. It explains the circuit description, fault conditions, diagnostic checks, repair decisions, ECM calibration review, and fault clearing steps for a 15-page Cummins PDF.
Official control fault DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, with associated coverage shown for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, and other listed Cummins platforms |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Fan Control Circuit |
| Publication no. | Bulletin Number 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 03-Jan-2011 |
| Pages | 15 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 245 – Fan Control Circuit – Voltage Below Normal or Shorted to Low Source
- 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
- 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 – Check ECM calibration and clear fault codes
Applicable truck models
The extract identifies this procedure for ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 fan control circuits, with associated procedure references also listing ISF2.8 CM2220 E, ISF3.8 CM2220 AN, ISB4.5, ISB6.7, ISD4.5, ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, ISM11 CM876 SN, ISZ13 CM2150, GX CM2250, QSL9 CM2250, and QSB6.7 CM2250. Component location is OEM-dependent, so the document directs users to the appropriate OEM service manual for fan control solenoid location and vehicle wiring details. See the manufacturer at Cummins official website.
Who needs this control fault DTCs manual
Workshop technicians need this control fault DTCs manual when diagnosing an amber CHECK ENGINE lamp with Fault Code 245, PID S33, SPN 647, FMI 4/4, where low signal voltage is detected at the fan control circuit when commanded ON. It is useful for checking whether the fan may stay on continuously or not run at all, and for following INSITE™ electronic service tool steps without guessing.
The procedure describes a PWM fan control circuit that supports variable speed and ON/OFF fan types. It notes that OEMs may wire the solenoid return to the ECM or to engine block or chassis ground, and that INSITE™ can identify the fan type and fan control logic setting. The troubleshooting flow includes inspection for loose, corroded, bent, broken, pushed-back, expanded, wet, dirty, or damaged connector pins; resistance checks at the fan control solenoid; pin-to-ground and pin-to-pin short checks; OEM harness inspection; ECM connector checks; calibration revision review; and clearing or disabling the fault code after repair validation. Full PDF available in the DiagTechPro manuals library, free account required to download.
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