Cummins ISB, QSB, ISC, QSC, ISL, QSL CM850 Electronic Troubleshooting Manual

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Covers: Cummins ISB, ISBe2, ISBe3, ISBe4, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL, ISLe3, ISLe4, and QSL9 CM850 Electronic Control System
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This manual covers Cummins CM850 electronic control system troubleshooting and repair. Complete 4 volume set dated 2014. See appropriate engine manual for mechanical troubleshooting & repair.

Topics:

Introduction

Engine and System Identification
Engine Identification
Engine Diagrams

Familiarization
Electronic Controlled Fuel System
Service Tools and Hardware – Overview

Troubleshooting Fault Codes
Exhaust Gas Pressure Sensor Number 1 Circuit – Voltage Above Normal, or Shorted to High Source
Exhaust Gas Pressure Sensor Number 1 Circuit – Voltage Below Normal, or Shorted to Low Source
Exhaust Gas Pressure Sensor Number 1 Circuit – Data Erratic, Intermittent, or Incorrect
Exhaust Gas Temperature Sensor Number 1 Circuit – Data Erratic, Intermittent, or Incorrect
Exhaust Gas Temperature Sensor Number 1 Circuit – Voltage Below Normal, or Shorted to Low Source
Exhaust Gas Temperature Sensor Number 1 Circuit – Voltage Above Normal, or Shorted to High Source
Engine Control Module Critical Internal Failure – Bad Intelligent Device or Component
Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signals – Data Erratic, Intermittent, or Incorrect
Intake Manifold Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
Intake Manifold Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Intake Manifold One Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
Accelerator Pedal or Lever Position Sensor Circuit – Shorted High
Accelerator Pedal or Lever Position Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Above Normal, or Shorted to High Source
Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Below Normal, or Shorted to Low Source
Oil Pressure Sensor Choice
Oil Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
Oil Pressure Low Choice
Oil Pressure Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
Coolant Temperature Sensor Circuit Choice
Engine Coolant Temperature 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source
Engine Coolant Temperature 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source
Engine Coolant Temperature 1 Sensor Circuit Choice
Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Engine Coolant Temperature Choice
Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level
Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level
Accelerator Pedal or Lever Position 1 Sensor Circuit Frequency – Data Valid but Below Normal Operational Range – Most Severe Level
Accelerator Pedal or Lever Position Sensor One – Data Valid but Above Normal Operational Range – Most Severe level
Engine Coolant Temperature Choice
Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Most Severe Level
Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Most Severe Level
Intake Manifold Air Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
Intake Manifold Air Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Intake Manifold 1 Temperature Choice
Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Most Severe Level
Engine Coolant Temperature 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source
Sensor Supply Voltage Number 2 Circuit Choice
Sensor Supply Voltage Number 2 Circuit – Voltage Below Normal or Shorted to Low Source
Sensor Supply 2 Circuit – Voltage Below Normal, or Shorted to Low Source
Coolant Level Sensor 1 Circuit – Choice
Coolant Level Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source
Coolant Level Sensor 1 Circuit – Choice
Coolant Level Sensor 1 Circuit – Voltage Below Normal or Shorted to Low Source
Coolant Level Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
Barometric Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
Barometric Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Sensor Supply Voltage Number 2 Circuit Choice
Sensor Supply Voltage Number 2 Circuit – Voltage Above Normal or Shorted to High Source
Sensor Supply 2 Circuit – Voltage Above Normal or Shorted to High Source
Engine Crankshaft Speed/Position Choice
Engine Crankshaft Speed/Position – Data Valid but Above Normal Operational Range – Most Severe Level
Engine Crankshaft Speed/Position – Data Valid but Above Normal Operational Range – Most Severe Level
Coolant Level Low – Data Valid but Below Normal Operational Range – Most Severe Level
External Speed Command Input (Multiple Unit Synchronization
Sensor Supply 3 Circuit – Voltage Below Normal, or Shorted to Low Source
Vehicle Speed Sensor Circuit – Data Erratic, Intermittent, or Incorrect
Vehicle Speed Sensor Circuit Tampering Has Been Detected – Abnormal Rate of Change
Fan Control Circuit – Voltage Below Normal or Shorted to Low Source
Engine Oil Level – Data Valid But Below Normal Operational Range – Most Severe Level
Injector Metering Rail 1 Pressure – Data Erratic, Intermittent, or Incorrect
Antitheft Password Valid Indicator – Data Erratic, Intermittent, or Incorrect
High Fuel Pressure Solenoid Valve Circuit Choice
High Fuel Pressure Solenoid Valve Circuit – Voltage Below Normal or Shorted to Low Source
High Fuel Pressure Solenoid Valve Circuit Choice
High Fuel Pressure Solenoid Valve Circuit – Voltage Above Normal or Shorted to High Source
Fuel Pumping Element Number 1 (Front
Fault Pump Pressurizing Assembly 1 – Mechanical System Not Responding Properly or Out of Adjustment
Engine Speed/Position Sensor (Crankshaft
SAE J1939 Multiplexing PGN Timeout Error – Abnormal Update Rate
SAE J1939 Multiplexing Configuration Error – Out of Calibration
SAE J1939 Multiplexing Accelerator Pedal or Lever Sensor System Error – Received Network Data Error
SAE J1939 Multiplexing Remote Accelerator Pedal or Lever Data Error – Received Network Data Error
Proprietary Datalink Error (/Vehicle Datalink
Auxiliary Temperature Sensor Input 1 – Special Instructions
Auxiliary Temperature Sensor Input 1 – Voltage Above Normal, or Shorted to High Source
Auxiliary Temperature Sensor Input 1 Circuit – Voltage Below Normal, or Shorted to Low Source
Barometric Pressure – Data Erratic, Intermittent, or Incorrect
Auxiliary Pressure Sensor Input 1 – Special Instructions
Auxiliary Pressure Sensor Input 1 – Special Instructions
Crankcase Pressure – Data Above Normal Operational Range – Severe Level
Auxiliary Pressure Sensor Input 1 Circuit – Voltage Above Normal, or Shorted to High Source
Auxiliary Pressure Sensor Input 1 Circuit – Voltage Below Normal, or Shorted to Low Source
Real Time Clock Power Interrupt – Data Erratic, Intermittent, or Incorrect
Injector Solenoid Driver Cylinder Circuit – Current Below Normal, or Open Circuit
Engine Coolant Temperature – Data Erratic, Intermittent, or Incorrect
Engine Control Module Data Lost – Data Erratic, Intermittent, or Incorrect
Electronic Calibration Code Incompatibility – Out of Calibration
Engine Control Module Warning Internal Hardware Failure – Bad Intelligent Device or Component
Injector Power Supply – Bad Intelligent Device or Component
Sensor Supply Voltage Number 1 Circuit – Voltage Below Normal or Shorted to Low Source
Sensor Supply Voltage Number 1 Circuit – Voltage Above Normal or Shorted to High Source
Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit – Voltage Above Normal or Shorted to High Source
SAE J1587/J1922 Data Link – Can Not Transmit
Engine Oil Rifle Pressure – Data Valid but Below Normal Operational Range – Most Severe Level
Water-In-Fuel Indicator Choice
Water-In-Fuel Indicator – Data Valid but Above Normal Operational Range – Least Severe Level
Water-In-Fuel Indicator – Data Valid but Above Normal Operational Range – Least Severe Level
SAE J1939 Data Link – Cannot Transmit
SAE J1939 Datalink – Abnormal Update Rate
Water-In-Fuel Sensor Circuit – Voltage Above Normal or Shorted to High Source
Water-In-Fuel Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Idle Validation Switch Circuit Choice
Accelerator Pedal or Lever Idle Validation Circuit – Data Erratic, Intermittent, or Incorrect
Accelerator Pedal or Lever Idle Validation Circuit – Out of Calibration
Intake Manifold Pressure Sensor Circuit – Data Incorrect
Power Supply Lost With Ignition On – Data Erratic, Intermittent or Incorrect
Oil Pressure Switch Sensor Circuit – Data Erratic, Intermittent or Incorrect
Intake Manifold 1 Temperature – Data Erratic, Intermittent, or Incorrect
Battery 1 Voltage – Data Valid but Below Normal Operational Range – Moderately Severe Level
Battery 1 Voltage – Data Valid but Below Normal Operational Range – Moderately Severe Level
Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit – Voltage Below Normal or Shorted to Low Source
Fuel Pressure High Choice
Injector Metering Rail Number 1 Pressure – Data Valid But Above Normal Operating Range – Most Severe Level
Injector Metering Rail Number 1 Pressure – Data Valid But Above Normal Operating Range – Most Severe Level
Injector Metering Rail Number 1 Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
Injector Metering Rail Number 1 Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Engine Oil Level – Data Valid But Below Normal Operational Range – Least Severe Level
Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level
Multiple Unit Synchronization Switch – Data Erratic, Intermittent, or Incorrect
Engine Oil Level Sensor Circuit – Voltage Above Normal, or Shorted to High Source
Engine Oil Level Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
Auxiliary Intermediate (PTO
Auxiliary Input/Out Two Circuit Voltage Above Normal or Shorted to High Source
Auxiliary Alternate Torque Validation Switch – Data Erratic, Intermittent, or Incorrect
Auxiliary Input/Output Three Circuit – Voltage Above Normal, or Shorted to High Source
Turbocharger 1 Wastegate Control – Mechanical System Not Responding Properly or Out of Adjustment
Idle Validation Switch Circuit Choice
Accelerator Pedal or Lever Idle Validation Circuit – Voltage Below Normal or Shorted to Low Source
Accelerator Pedal or Lever Idle Validation Circuit – Voltage Below Normal or Shorted to Low Source
Accelerator Pedal or Lever Idle Validation Circuit – Voltage Below Normal or Shorted to Low Source
Injector Metering Rail One Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
Injector Metering Rail 1 Pressure – Data Erratic, Intermittent, or Incorrect
Fuel Pump Delivery Pressure Low Choice
Fuel Pump Delivery Pressure Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
Injector Metering Rail 1 Pressure – Data Valid but Below Normal Operational Range – Moderately Severe Level
Starter Relay Circuit – Voltage Above Normal or Shorted to High Source
Starter Relay Circuit – Voltage Below Normal or Shorted to Low Source
Turbocharger Number 1 Speed High Choice
Turbocharger Number 1 Speed High – Warning Level
Turbocharger Number 1 Speed High – Data Valid but Above Normal Operational Range – Moderately Severe Level
Electrical Charging System Voltage High – Data Valid but Above Normal Operational Range – Moderately Severe Level
Electrical Charging System Voltage Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
Electrical Charging System Voltage Low – Data Valid but Below Normal Operational Range – Most Severe Level
Auxiliary Commanded Dual Output Shutdown – Special Instructions
Change Lubricating Oil and Filter – Condition Exists
Turbocharger Speed Sensor Choice
Turbocharger Speed Sensor – Below Normal Operating Range
Turbocharger Number 1 Speed Low – Data Valid but Below Normal Operating Range – Moderately Severe Level
Engine Oil Level – Data Valid But Above Normal Operational Range – Most Severe Level
Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect
Turbocharger Number 1 Compressor Inlet Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
Turbocharger Number 1 Compressor Inlet Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Engine Speed/Position Sensors Choice
Engine Speed Sensor/Position Camshaft and Crankshaft Misalignment – Mechanical System Not Responding Properly or Out of Adjustment
Engine Speed Sensor/Position Camshaft and Crankshaft Misalignment – Mechanical System Not Responding Properly or Out of Adjustment
Electronic Control Module Data Lost – Condition Exists
Engine Speed Sensor (Camshaft
Auxiliary Equipment Sensor Input Number 3 ( Switch
Adaptive Cruise Control – Error
Cylinder Power Imbalance Detected
EGR Valve Position – Data Erratic, Intermittent, or Incorrect
VGT Position Sensor – Data Erratic, Intermittent, or Incorrect
Power Lost Without Ignition Off Choice
Power Lost Without Ignition Off – Data Erratic, Intermittent or Incorrect
Power Lost Without Ignition Off – Data Erratic, Intermittent or Incorrect
Injector Solenoid Driver Cylinder 1 – Mechanical System Not Responding Properly or Out of Adjustment
Injector Solenoid Driver Cylinder 2 – Mechanical System Not Responding Properly or Out of Adjustment
Injector Solenoid Driver Cylinder 3 – Mechanical System Not Responding Properly or Out of Adjustment
Injector Solenoid Driver Cylinder 4 – Mechanical System Not Responding Properly or Out of Adjustment
Injector Solenoid Driver Cylinder 5 – Mechanical System Not Responding Properly or Out of Adjustment
Injector Solenoid Driver Cylinder 6 – Mechanical System Not Responding Properly or Out of Adjustment
EGR Valve Position – Data Erratic, Intermittent, or Incorrect
VGT Position Sensor – Data Erratic, Intermittent, or Incorrect
Accelerator Pedal or Lever Position Sensor 2 Circuit – Voltage Above Normal or Shorted to High Source
Accelerator Pedal or Lever Position Sensor 2 Circuit – Voltage Below Normal or Shorted to Low Source
Accelerator Pedal or Lever Position Sensor 1 and 2 – Data Erratic, Intermittent, or Incorrect
Komnet Datalink Cannot Transmit – Data Erratic, Intermittent, or Incorrect
Auxiliary Equipment Sensor Input Number 3 ( Switch
Engine Misfire Cylinder 1 – Condition Exists
Engine Misfire Cylinder 2 – Condition Exists
Engine Misfire Cylinder 3 – Condition Exists
Engine Misfire Cylinder 4 – Condition Exists
Engine Misfire Cylinder 5 – Condition Exists
Engine Misfire Cylinder 6 – Condition Exists
Catalyst Inlet Temperature Sensor Swapped with Outlet – Condition Exists
Catalyst Missing – Condition Exists
Exhaust Gas Temperature 1 Circuit – Voltage Below Normal, or Shorted to Low Source
Exhaust Gas Temperature Circuit 1 – Voltage Above Normal, or Shorted to Low Source
Exhaust Gas Temperature 1 – Data Erratic, Intermittent, or Incorrect
Catalyst Tank Level Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
Catalyst Tank Level Sensor Circuit – Voltage Above Normal, or Shorted to High Source
Catalyst Tank Level – Data Valid but Below Normal Operational Range – Moderately Severe Level.
Catalyst Tank Level – Data Erratic, Intermittent, or Incorrect
Exhaust Gas Temperature 2 Circuit – Voltage Below Normal, or Shorted to Low Source
Exhaust Gas Temperature 2 Circuit – Voltage Above Normal, or Shorted to Low Source
Exhaust Gas Temperature 2 – Data Erratic, Intermittent, or Incorrect
Catalyst Tank Temperature – Voltage Below Normal, or Shorted to Low Source
Catalyst Tank Temperature – Voltage Above Normal, or Shorted to High Source
Catalyst Tank Temperature – Data Erratic, Intermittent, or Incorrect
Dosing Control Unit – Bad Intelligent Device or Component
Catalyst Reagent Dosing Unit Input Lines – Condition Exists
Catalyst Tank Heater Circuit – Voltage Above Normal, or Shorted to High Source
Catalyst Tank Heater Circuit – Voltage Above Normal, or Shorted to High Source
Catalyst Over Temperature – Data Valid but Above Normal Operational Range – Most Severe Level
Real-Time Clock Power Interrupt – Data Erratic, Intermittent or Incorrect
Aftertreatment Outlet NOx Sensor – Voltage Below Normal or Shorted to Low Source
Aftertreatment Outlet NOx Sensor – Data Erratic, Intermittent, or Incorrect
Aftertreatment #1 Air Enable Actuator – Voltage Above Normal, or Shorted to High Source
Aftertreatment #1 Air Enable Actuator – Voltage Below Normal, or Shorted to Low Source
Catalyst Tank Level Sensor – Data Erratic, Intermittent, or Incorrect
Dosing Control Unit Datalink – Abnormal Update Rate
Catalyst Tank Heater Circuit – Data Valid But Below Normal Operating Range – Moderately Severe Level
Catalyst Tank Heater Circuit – Data Valid But Above Normal Operating Range – Moderately Severe Level
Auxiliary Temperature Sensor Input 1 Circuit – Root Cause Not Known
Exhaust Gas Temperature 1 – Data Valid but Above Normal Operational Range – Least Severe Level
Engine Misfire for Multiple Cylinders – Condition Exists
Intake Manifold 1 Temperature – Abnormal Rate of Change
Exhaust Gas Temperature 1 – Abnormal Rate of Change
Exhaust Gas Temperature 2 – Abnormal Rate of Change
Wheel-Based Vehicle Speed – Data Valid but Below Normal Operational Range – Moderately Severe Level
Injector Metering Rail 1 Pressure – Data Valid but Above Normal Operational Range – Most Severe Level
Engine Crankshaft Speed/Position – Data Valid but Above Normal Operational Range – Moderately Severe Level
Engine Brake Actuator Driver 1 Circuit – Voltage Below Normal, or Shorted to Low Source
Sensor Supply Voltage 4 Circuit – Voltage Above Normal or Shorted to High Source
Sensor Supply Voltage 4 Circuit – Voltage Below Normal or Shorted to Low Source
Auxiliary Equipment Sensor Input Engine Protection Critical-Special Instructions
Fuel Pump Delivery Pressure Low Choice
Fuel Pump Delivery Pressure Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
Fuel Pump Delivery Pressure Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
Fuel Pump Delivery Pressure High Choice
Fuel Pump Delivery Pressure High – Data Valid but Above Normal Operational Range – Moderately Severe Level
Fuel Pump Delivery Pressure High – Data Valid but Above Normal Operational Range – Moderately Severe Level
Engine Control Module Calibration Program Memory (RAM
Injector Metering Rail 1 Pressure – Data Valid but Below Normal Operational Range – Most Severe Level
Electric Lift Pump for Engine Fuel Supply Circuit – Voltage Above Normal or Shorted to High Source
Electric Lift Pump for Engine Fuel Supply Circuit – Voltage Below Normal or Shorted to Low Source
EGR Valve Position Sensor Circuit – Voltage Above Normal or shorted to High Source
EGR Valve Position Sensor Circuit – Voltage Below normal or Shorted to Low Source
EGR Valve Differential Pressure Sensor Circuit – Shorted High
EGR Valve Differential Pressure Sensor Circuit – Shorted Low
Fuel Inlet Meter Device – Data Valid but Above Normal Operational Range – Moderately Severe Level
Fuel Inlet Meter Device Flow Demand Lower Than Expected – Data Valid but Below Normal Operational Range – Moderately Severe Level
Fueling Actuator Number 1 Circuit Error Conditions Exists
Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect
Backup Engine Speed/Position Sensor Number 2 – Data Erratic, Intermittent, or Incorrect
Turbocharger Speed Choice
Turbocharger Speed – Invalid Rate of Change Detected
Turbocharger Speed Invalid Rate of Change detected – Abnormal Rate of Change
Exhaust Gas Temperature Choice
Exhaust Gas Temperature – Data Above Normal
Turbocharger Turbine Inlet Temperature (Calculated
Turbocharger Compressor Outlet Temperature Choice
Turbocharger Compressor Outlet Temperature – Data Above Normal
Turbocharger Compressor Outlet Air Temperature (Calculated
EGR Valve Failed Automatic Calibration Procedure
EGR Valve Control Circuit – Current Below Normal or Open Circuit
EGR Valve Control Circuit – Voltage Below Normal or Shorted to Low Source
EGR Valve Control Circuit – Voltage Above Normal or Shorted to High Source
EGR Valve Control Circuit – Current Above Normal or Grounded Circuit
EGR Valve Control – Mechanical System Not Responding Properly or Out of Adjustment
EGR Differential Pressure Sensor – Data Valid But Above Normal Operating Range – Moderately Severe Level
Engine Brake Actuator Circuit Number 1 – Voltage Below Normal or Shorted to Low Source
Engine Brake Actuator Circuit Number 2 – Voltage Below Normal or Shorted to Low Source
Engine Brake Actuator Circuit Number 1 – Voltage Above Normal or Shorted to High Source
Engine Brake Actuator Circuit Number 2 – Voltage Above Normal or Shorted to High Source
Exhaust Gas Pressure Sensor Circuit – Shorted High
Exhaust Gas Pressure Sensor Circuit – Shorted Low
Exhaust Gas Recirculation (EGR
Recirculation Exhaust Gas Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
Fan Control Circuit – Voltage Above Normal or Shorted to High Source
Turbocharger Position Sensor Circuit – Shorted High
Turbocharger Position Sensor Circuit – Shorted Low
Variable Geometry Turbocharger Actuator Circuit – Current Below Normal, or Open Circuit
VGT Actuator Choice
VGT Actuator – Voltage Below Normal or Shorted to Low Source
VGT Actuator Driver Circuit – Voltage Below Normal, or Shorted to Low Source
VGT Actuator Choice
VGT Actuator – Voltage Above Normal or Shorted to High Source
VGT Actuator Driver Circuit – Voltage Above Normal, or Shorted to High Source
Turbocharger Actuator Motor Circuit – Current Above Normal
Turbocharger Actuator Motor – Mechanical System Not Responding Properly
Variable Geometry Turbocharger Actuator Position Failed Automatic Calibration Procedure – Out of Calibration
Coolant Level – Data Valid But Below Normal Operational Range – Least Severe Level
Exhaust Pressure Sensor Circuit – Data Erratic, Intermittent, or Incorrect
Intake Air Heater Number 1 Circuit – Voltage Above Normal or Shorted to High Source
Intake Air Heater Number 1 Circuit – Voltage Below Normal or Shorted to Low Source
Auxiliary PWM Driver Number 1 – Voltage Above Normal or Shorted to High Source
Auxiliary PWM Driver Number 1 – Voltage Below Normal or Shorted to Low Source
Engine Coolant Temperature – Condition Exists
Aftertreatment Outlet NOx Sensor – Abnormal Update Rate
Aftertreatment Outlet NOx – Data Valid but Above Normal Operational Range – Least Severe Level
Aftertreatment Outlet NOx – Data Valid but Above Normal Operational Range – Most Severe Level
EGR Temperature – Data Valid But Above Normal Operating Range, Least Severe Level
EGR Temperature – Data Valid But Above Normal Operating Range, Moderately Severe Level
Engine Coolant Temperature High – Data Valid but Above Normal Operational Range – Least Severe Level
Intake Manifold Temperature High – Data Valid but Above Normal Operational Range – Least Severe Level
Intake Manifold Pressure Sensor Circuit – Data Erratic, Intermittent or Incorrect
Dosing Control Unit Temperature – Data Erratic, Intermittent, or Incorrect
EGR Valve Actuator Over Temperature (Calculated
Variable Geometry Turbocharger Actuator Over Temperature

Troubleshooting Symptoms
Troubleshooting Procedures and Techniques
Troubleshooting Symptoms Charts
Communication Error – Electronic Service Tool or Control Device
Engine Fan Does Not Operate or Operates Erratically
Engine Will Not Shut Off
Fault Code Warning Lamps Stay On (No Apparent Reason)
Fault Code Warning Lamps Do Not Illuminate
Intake Manifold Air Temperature Above Specification
Low Idle Adjust Switch Does Not Work
PTO or Cruise Control Does Not Operate
Air Shutoff Valve will not Activate
Air Shutoff Valve will not Deactivate

Troubleshooting Symptoms (New Format)
ECM – No Communication Troubleshooting Tree
Engine Performance Troubleshooting Tree – ISC, QSC, ISL, and QSL CM850
Engine Performance Troubleshooting Tree – ISB, ISBe, and QSB CM850 without EGR
Engine Performance Troubleshooting Tree – QSB5.9 Marine CM850
Engine Performance Troubleshooting Tree – QSC and QSL Marine CM850
Engine Performance Troubleshooting Tree – ISB, ISBe, and QSB CM850 with EGR
Fuel Economy Troubleshooting Tree

Electronic Engine Controls – Group 19
Service Tools
Barometric Air Pressure Sensor
Battery Ground Circuit
Clutch Pedal Position Switch
Clutch Pedal Position Switch Circuit
Exhaust Gas Temperature Sensor
Engine Coolant Level Sensor
Engine Coolant Temperature Sensor
Cruise Control or PTO ON/OFF Switch
Cruise Control or PTO ON/OFF Switch Circuit
Cruise Control or PTO Set/Resume Select Switch
Cruise Control or PTO Set/Resume Select Switch Circuit
Diagnostic Test Mode Switch
Diagnostic Test Mode Switch Circuit
Electronic Control Module (ECM
ECM Calibration Code
Engine Brake ON/OFF Switch
Engine Brake ON/OFF Switch Circuit
Engine Brake Selector Switch
Engine Wiring Harness
Fan Clutch Circuit
Fault Lamp
Fault Lamp Circuit
Idle Adjust Switch
Idle Adjust Switch Circuit
Idle Validation Switch
Lubricating Oil Level Sensor
Intake Manifold Air Temperature Sensor
Intake Manifold Pressure Sensor
Internal Actuator Wiring Harness
Key Switch Battery Supply Circuit
Engine Oil Pressure Sensor
Wiring Harness
Programmable Features and Parameters Not Correct
Remote PTO Switch Circuit
Remote PTO Switch
Tachometer Circuit
Accelerator Pedal or Lever Position Sensor
Accelerator Pedal or Lever Position Sensor Circuit
Unswitched Battery Supply Circuit
Brake Pedal Position Switch
Brake Pedal Position Switch Circuit
Vehicle Speed Sensor, Digital Input
Vehicle Speed Sensor, Magnetic Pick Up
Vehicle Speed Sensor Circuit
Fuel Control Valve
Rail Fuel Pressure Sensor
Fuel Pump Actuator
Water In Fuel Sensor
Engine Brake Harness
Intake Manifold Pressure/Temperature Sensor
Data Link Circuit, SAE J1939
Data Link Circuit, SAE J1587
Exhaust Brake ON/OFF Switch
Exhaust Brake ON/OFF Switch Circuit
Ring Terminal
Fuse, Harness In-Line
Connector, Butt Splice
Weather Pak Connector Series
Metripack Connector Series
AMP Connector Series
Deutsch™ DRC Connector Series
Deutsch™ DT Connector Series
Deutsch™ DTM and DTP Connector Series
Deutsch™ HD10 Connector Series
Deutsch™ HDP20 and HD30 Connector Series
ITT Cannon Connector Series
AMP VP44 Connector Series
Packard Relay Connector
Ford™ Connector Series
D-Sub Miniature Connector
Bosch™ Actuator and Sensor Connector Series
Bosch™ ECM Injector Driver Connector Series
Bosch™ ECM Actuator and Sensor Connector Series
Bosch™ ECM Connector Series
Framatome Connector Series
Power Train Protection Switch
Power Train Protection Switch Circuit
Two-Speed Axle Switch
Two-Speed Axle Switch Circuit
Air Conditioning Pressure Switch
Air Conditioning Pressure Switch Circuit
Accelerator Interlock Switch
Accelerator Interlock Switch Circuit
Cab Switchable Governor Switch
Cab Switchable Governor Switch Circuit
Switched Maximum Operating Speed Switch
Switched Maximum Operating Speed Switch Circuit
Multi Unit Synchronization Switch
Multi Unit Synchronization Switch Circuit
Intermediate Speed Control 1 Switch
Alternate Torque Switch
Real-Time Clock Battery Backup Module
Tachograph Circuit
Engine Protection Override Switch
Engine Protection Override Switch Circuit
Fan Clutch Switch
Fan Clutch Switch Circuit
Remote Accelerator Switch
Remote Accelerator Switch Circuit
Engine Torque Limit Control Switch
Engine Torque Limit Control Switch Circuit
Multimeter Usage
Resistance Measurement Using a Multimeter and a Wiring Diagram
Component Connector and Pin Inspection
Inactive or Intermittent Fault Code
Camshaft Position Sensor
Crankshaft Position Sensor
EGR Differential Pressure Sensor
EGR Valve Position Sensor
EGR Valve Assembly Circuit
Exhaust Gas Pressure Sensor
EGR Temperature Sensor
Fan Control Switch
Fan Control Switch Circuit
Maximum Engine Speed Switch
Maximum Engine Speed Switch Circuit
Turbocharger Control Valve
Turbocharger Speed Sensor
Turbocharger Compressor Intake Air Temperature Sensor
Fuel Lift Pump
Pressure Sensor
Pressure Sensor Circuit
Temperature Sensor
Temperature Sensor Circuit
Turbocharger Position Sensor
Air Heater Control Relay Circuit
Transmission Shift Modulation Signal Circuit
Starter Lockout/Switched Outputs Relay Circuit
ECM ROM Boot
Engine Datalinks
Slow Idle Switch
Slow Idle Switch Circuit
Station Select Switch
Station Select Switch Circuit
Aftertreatment Diesel Exhaust Fluid Dosing Unit
Crankcase Pressure Sensor
Aftertreatment Outlet NOx Sensor
Bosch Aftertreatment DEF Controller Connector

Specifications

4021416