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

Covers: Cummins ISB, ISBe2, ISBe3, ISBe4, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL, ISLe3, ISLe4, and QSL9 CM850 Electronic Control System
Pages: 3,274
Format: PDF
File size: 52mb
Works with: Windows/Mac/Tablet/Smartphone

Download the Cummins CM850 electronic control system troubleshooting manual in a high resolution PDF format. Dated 2014, this 4-volume, 3,000+ page manual covers detailed OEM fault code and symptom troubleshooting procedures for CM850 ECM electronics.

For mechanical troubleshooting and repair instructions, refer to the appropriate engine manual (sold separately).

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

• 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