This fan control fault DTCs document is a 13-page troubleshooting procedure for Fault Code 245 on CM2150 engine applications. It explains the fan control circuit, the conditions that set the fault, and the guided checks for the solenoid, ECM connector, and OEM harness.
Official fan control fault DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC and ISL with CM2150 |
| System/Group | DTCs; Fan Control Circuit |
| Publication no. | Not shown |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 245
- 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 codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines in the 2007-09 coverage group. The extract also identifies the procedure as “ISB, ISC and ISL with CM2150 – Fan Control Circuit,” so it is relevant where the vehicle uses the CM2150 fan control circuit and the OEM fan solenoid configuration matches the tested system. The component location varies by OEM, and the document directs users to the appropriate OEM troubleshooting and repair manual for locating the control solenoid and checking OEM-specific wiring. Manufacturer information is available at Cummins official website.
Who needs this fan control fault DTCs manual
Workshop technicians need this procedure when Fault Code 245 is active with an amber CHECK ENGINE light and a fan that may stay on continuously or not run at all. It is useful for mechanics using INSITE™ electronic service tool and a multimeter to confirm whether the problem is in the fan control solenoid, connector pins, ECM connection, or OEM harness.
The diagnostic covers a PWM fan control circuit used with variable speed and ON/OFF fan types. It states that the ECM logs Fault Code 245 when it commands 12 or 24 VDC to the fan control solenoid but detects lower voltage on the fan control signal circuit, commonly indicating a short to ground in the harness or solenoid. The checks include connector inspection for corrosion, bent pins, moisture, damaged seals, wire insulation damage, and broken locking tabs. Electrical tests include resistance between SIGNAL and RETURN pins, pin-to-ground short checks, supply voltage checks greater than 5 VDC, and OEM harness resistance checks greater than 100k ohms. The final steps verify inactive status with INSITE™, disable the fault using the coolant temperature sensor procedure described in the file, and clear inactive fault codes after repair.
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