This Cummins fan clutch document is a 6-page troubleshooting PDF for Fault Code 245 on ISB CM550 engines. It identifies the engine fan clutch supply circuit fault, lists the related PID S033, SPN 647, and FMI 4 references, and gives step-by-step checks for the fan clutch solenoid, ECM wiring, OEM harness, and fault-code clearing.
Official Cummins fan clutch document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 |
| System/Group | ISB CM550 (1990-94) / DTCs; Engine Fan Clutch Supply Circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Unknown; copywrite 2017 shown on source pages |
| Pages | 6 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 245
- PID: S033
- SPN: 647
- FMI: 4
- Engine Fan Clutch Supply Circuit
- Description
- Component Location
- Troubleshooting Steps
- Step 1A: fan clutch or fan clutch relay inspection and current draw check
- Step 2A through Step 2D: engine harness and ECM connector inspection, open circuit check, short to ground check, and short between pins check
- Step 3A through Step 3D: OEM harness, 23-pin connector, fan clutch solenoid or relay inspection, open circuit check, short to ground check, and pin-to-pin short check
- Step 4A and Step 4B: disable the fault code, verify Fault Code 245 is inactive, and clear inactive fault codes
Applicable truck models
This file applies to Cummins ISB CM550 engine diagnostic coverage in the ISB CM550 (1990-94) DTC group. The extract does not name specific truck makes or chassis models, and it directs the technician to an original equipment manufacturer diagram for the fan clutch solenoid location. The procedure covers the fan clutch solenoid or relay circuit controlled by the ECM, including checks at pin 31 of the engine harness connector and pin N of the 23-pin OEM harness connector. For current manufacturer information, visit Cummins official website.
Who needs this Cummins fan clutch manual
Workshop owners, diesel mechanics, and diagnostic technicians need this Cummins fan clutch manual when Fault Code 245 is active or stored and the engine fan is suspected of having a supply circuit, connector, relay, solenoid, or harness fault. The document is useful when confirming less than 10 ohms continuity, more than 100k ohms isolation, correct diagnostic tool settings, and final inactive-code verification.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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