Cummins CM850 Electronic Control System Troubleshooting and Repair Manual, Volume 4: ISB, QSB, ISC, QSC8.3, ISL & QSL9

This is Volume 4 of the Cummins troubleshooting and repair manual for engines with the CM850 control module. It covers the ISB, ISBe2, ISBe3, ISBe4, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL, ISLe3, ISLe4 and QSL9.

It includes fault code diagnosis and symptom-based troubleshooting, CM850 ECM pinouts and sensor circuits, diagnostic steps for the fuel system, sensors and actuators, component tests, and wiring and connector repair.

What the manual covers

• Fault code diagnosis and symptom-based troubleshooting
• CM850 ECM pinouts and sensor circuits
• Fuel system, sensor and actuator diagnostics
• Wiring and connector repair
• Component testing

Compatibility

• Models: ISB, ISBe2, ISBe3, ISBe4, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL, ISLe3, ISLe4, QSL9
• Control module: CM850
• Volume: Volume 4 of a multi-volume set
• Manual type: Electronic control system troubleshooting and repair

Before you buy

This listing is for Volume 4 only. If you're chasing a specific fault code, email us first and we'll check whether it's in this volume.

Your engine's dataplate shows the engine model, the engine serial number (ESN) and the CPL number. Compare those with the models above. If you're not sure, email us the dataplate details and we'll check for you.

File format

PDF download. Nothing is shipped. Opens on a computer, tablet or phone.

We're an independent seller and are not affiliated with or endorsed by Cummins. Brand and model names are used only to identify the engines this manual covers.