Cummins printed this book as bulletin 4021416 in April 2014. It is the factory troubleshooting and repair manual for CM850-controlled ISB, ISBe, QSB, ISC, QSC8.3, ISL, ISLe and QSL9 engines, with four volumes in one PDF.
An engine that sits with an amber lamp on loses you hours. Each fault code tree gives you the circuit description, component location and step-by-step checks, so you test the circuit instead of throwing sensors at it. Group 19 covers sensor and switch circuits, connector and pin repair, NOx sensors, the DEF dosing unit and the ECM.
Wiring diagrams come as separate bulletins listed in Service Literature, and rebuild procedures are in the engine shop manual. Print the Group 19 torque table and the sensor resistance charts from the Specifications section and keep them at the engine while you work.
What's Inside This Cummins ISB, ISC, ISL, QSB, QSC, QSL9 Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 1-25 | How to Use the Manual, Symbols, General Safety Instructions, Welding on a Vehicle, General Repair and Cleaning Instructions, Acronyms and Abbreviations |
| Engine and System Identification | 26-65 | Engine Dataplate, ECM Dataplate, Engine Serial Number (ESN), Control Parts List (CPL), Engine Diagrams and Views |
| Familiarization | 66-89 | Electronic Controlled Fuel System, Diagnostic Fault Codes, Engine Protection System, Fault Code Snapshot Data, Insite Electronic Service Tool, Service Tools and Hardware Overview |
| Troubleshooting Fault Codes (Volumes 1-4) | 90-2617 | Fault Code Troubleshooting Trees, Circuit Descriptions, Component Location, Shop Talk, Clearing Inactive Fault Codes with Insite |
| Troubleshooting Symptoms | 2618-2635 | Symptom Charts: Fault Code Lamps, Engine Fan, Engine Will Not Shut Off, PTO or Cruise Control, Intake Manifold Air Temperature, Air Shutoff Valve, Communication Error |
| Troubleshooting Symptoms (New Format) | 2636-2871 | Performance Symptom Trees: Low Power, Will Not Reach Rated Speed, Low Boost, Excessive Vibration, Fuel Leakage Isolation Tests |
| Electronic Controls - Group 19 | 2872-3211 | Sensor and Switch Circuits, Resistance and Short Circuit Checks, Connector and Pin Replacement, Aftertreatment DEF Dosing Unit, NOx Sensors, ECM |
| Service Literature | 3212-3217 | Additional Service Literature, Separate Wiring Diagram Bulletins, Customized Parts Catalog |
| Specifications | 3218-3274 | Group 19 Torque Values, Sensor Resistance and Pressure Tables, J1939 Termination Resistance, Fault Code Information Tables, Valve Lash |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Barometric air pressure sensor torque | 9 N•m [80 in-lb] | p. 3221 |
| Exhaust gas temperature sensor torque | 30 N•m [22 ft-lb] | p. 3221 |
| Engine coolant temperature sensor torque | 23 N•m [17 ft-lb] | p. 3221 |
| ECM mounting capscrews torque | 18 N•m [159 in-lb] | p. 3221 |
| ECM 60-pin connector torque | 3 N•m [27 in-lb] | p. 3221 |
| Intake manifold air temperature sensor torque | 23 N•m [17 ft-lb] | p. 3221 |
| Intake manifold pressure sensor torque | 23 N•m [17 ft-lb] | p. 3222 |
| Engine oil pressure sensor torque | 23 N•m [17 ft-lb] | p. 3222 |
| Rail fuel pressure sensor torque | 70 N•m [52 ft-lb] | p. 3222 |
| Camshaft position sensor torque | 10 N•m [89 in-lb] | p. 3223 |
| Crankshaft position sensor torque | 25 N•m [221 in-lb] | p. 3223 |
| NOx sensor installation torque | 50 N•m [37 ft-lb] | p. 3226 |
| J1939 termination resistance | 110 to 130 Ohms | p. 3241 |
| Fuel pump actuator (EFC) resistance | 2.0 to 4.5 Ohms | p. 3241 |
| Rail fuel pressure sensor in-range check | 0 ±40 bar [0 ±580 psi] | p. 2133 |
| Intake valve lash operating limits | 0.152 to 0.381 mm [0.006 to 0.015 in] | p. 3249 |
Cummins ISB, ISC, ISL, QSB, QSC, QSL9 Common Problems This Manual Covers
Amber lamp with Fault Code 418, white smoke, loss of power or hard starting
Fault Code 418 means the water in fuel indicator has detected water in the fuel filter, and the book lists possible white smoke, loss of power or hard starting as the effect. Its fault code tree walks you through the checks, then clear the inactive code with INSITE once the repair is done.
Manual Section: Troubleshooting Fault Codes (Volumes 1-4) p. 924Foamy fuel in the clear test line, hard starting or rough running
A few bubbles in the clear line during the air in fuel test are expected. A foamy appearance means a leak that lets air in, an inlet restriction severe enough to cause cavitation, or a system that is not yet primed. The fault code tree then has you check fuel inlet restriction before hunting for the air source.
Manual Section: Troubleshooting Fault Codes (Volumes 1-4) p. 1945EGR temperature high fault codes
Check the coolant level before you condemn the EGR cooler or a sensor. Low engine coolant makes flow through the engine and EGR cooler erratic, and that drives EGR temperatures up. The fault code tree asks for the coolant level first and sends you to replenish the cooling system if it is low.
Manual Section: Troubleshooting Fault Codes (Volumes 1-4) p. 2575Several sensor fault codes active at once
When several sensor codes go active together, suspect the 5 volt supply or ground circuit they share before you blame any one sensor. Group 19 covers the resistance and short circuit checks, plus connector and pin replacement when a terminal turns out to be the problem.
Manual Section: Electronic Controls - Group 19 p. 3123Frequently Asked Questions
How do I clear inactive fault codes on a CM850 engine?
Use the INSITE electronic service tool. The manual explains that the Reset All Faults command clears both active and inactive faults, and the fault code trees end with a step to clear the inactive code once the repair is done. p. 2518
What are the sensor torque values for the Cummins ISB, ISC, ISL, QSB, QSC, QSL9?
Exhaust gas temperature sensor 30 N•m [22 ft-lb]. Coolant temperature and oil pressure sensors 23 N•m [17 ft-lb] each. Rail fuel pressure sensor 70 N•m [52 ft-lb]. Crankshaft position 25 N•m [221 in-lb], camshaft position 10 N•m [89 in-lb], barometric pressure 9 N•m [80 in-lb]. The ECM 60-pin connector takes only 3 N•m [27 in-lb]. p. 3221
How do I troubleshoot rail fuel pressure faults?
The fault code tree has you check the rail fuel pressure sensor first: it must read in range, 0 ±40 bar [0 ±580 psi]. From there the same tree moves on to the low pressure fuel system, air in the fuel and lift pump fuel pressure. p. 2133
Do ISB/QSB engines need valve lash adjustment?
On ISB/QSB engines with the no-adjust overhead, lash adjustment is not required for normal service during the first 241,402 km [150,000 mi]. The Specifications section gives the limits the valve train operates acceptably within, for example 0.152 to 0.381 mm [0.006 to 0.015 in] intake valve lash. p. 3249
Does this book include wiring diagrams?
No. Cummins publishes the wiring diagrams as separate bulletins, and the Service Literature section lists them. This book gives you the circuit descriptions, the resistance and short circuit checks, and connector repair. Get the wiring diagram bulletin for your engine to go with it. p. 3214
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