John Deere Tractor 6215, 6415, 6615, 6715 Diagnostic & Test Service Manual A Brief Introduction to the John Deere Tractor 6215 Power and Performance The John Deere Tractor 6215 boasts exceptional power and performance that make it a standout choice among modern tractors. With its robust engine and superior torque, it can tackle a wide range of tasks, from plowing and tilling to hauling heavy loads. This machine ensures that you get the job done efficiently and with precision, ultimately leading to increased productivity on your farm. Cutting-Edge Technology One of the key features that sets the John Deere Tractor 6215 apart is its integration of cutting-edge technology. Equipped with advanced GPS systems, it enables precise and efficient navigation across your fields, resulting in reduced overlap and less fuel consumption. This not only saves you time but also contributes to cost savings in the long run.

1. John Deere Agriculture
6215, 6415, 6615, 6715 Tractors - Operation &
Tests, Diagnosis
6415, 6615, 6715, 6215 (SN: 000000-398790,
398791- )
DIAGNOSIS AND TESTS SERVICE
MANUAL
tm4648, May 2009

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tm4648-DIAGNOSIS AND TESTS SERVICE MANUAL
tm4648-DIAGNOSIS AND TESTS SERVICE MANUAL
(g) by Belgreen
Table of contents
FOREWORD
VERSION DATE
Section 210 - GENERAL INFORMATION
Group 05 - Safety Measures
Group 15 - General References
Section 211 - DIAGNOSTIC CODES
Group BCU - BCU Diagnostic Trouble Codes
Group ECU - ECU Diagnostic Trouble Codes
Section 212 - OBSERVABLE SYMPTOMS
Group 20 - Engine
Group 40 - Electrical System
Group 50 - SyncroPlus™ Transmission
Group 51 - PowrReverser™ Transmission
Group 55 - PowrQuad™ Transmission
Group 60 - Steering and Brakes
Group 90 - Operator′s Cab
Section 213 - SYSTEM DIAGNOSTICS
Group 45 - Electronics
Section 220 - ENGINE
Group 10 - Functional Tests
Group 15 - Tests and Adjustments
Section 230 - FUEL, AIR INTAKE AND COOLING SYSTEMS
Group 15 - Tests and Adjustments
Group 20 - Theory of Operation
Section 240 - ELECTRICAL SYSTEM
Group 10 - Sub-System Diagnostics (Cab)
Group 10A - Sub-System Diagnostics (Open Operator′s Station)
Group 15 - Component Testing
Group 25 - Functional Schematics (Cab)
Group 25A - Functional Schematics (Open Operator′s Station)
Group 26 - Wiring Harnesses, Survey
Group 26A - Wiring Harnesses
Group 26B - Wiring Harnesses from Serial Number 398656
Section 245 - ELECTRONIC CONTROL UNITS
Group 05 - Operation and General Information on Diagnostics
Group 10 - Data BUS Systems, Diagnosis
Group 20 - Data BUS Systems
Group BCU - BCU - Basic Control Unit
Group ECU - ECU - Engine control unit
Section 250 - SYNCROPLUS™ TRANSMISSION
Group 05 - Preliminary Checks
Group 10 - Functional Tests
Group 15 - Tests and Adjustments
Group 20 - Theory of Operation
Section 251 - POWRREVERSER™ TRANSMISSION
Group 10 - Functional Tests
Group 15 - Tests and Settings
Group 20 - Theory of Operation

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tm4648-DIAGNOSIS AND TESTS SERVICE MANUAL
tm4648-DIAGNOSIS AND TESTS SERVICE MANUAL
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Section 255 - POWRQUAD™ AND RANGE TRANSMISSION
Group 10 - Functional Tests
Group 15 - Tests and Settings
Group 20 - Theory of Operation
Section 256 - POWER TRAIN (WITHOUT TRANSMISSION)
Group 10 - Functional Tests
Group 15 - Tests and Adjustments
Group 20 - Theory of Operation
Section 260 - STEERING AND BRAKES
Group 05 - Introductory Checks
Group 10 - Operational Check-Out
Group 15 - Tests and Adjustments
Group 20 - Theory of Operation
Section 270 - HYDRAVANTAGE™ HYDRAULIC SYSTEM
Group 10 - Operational Check-Out
Group 15 - Tests and Adjustments
Group 20 - Theory of Operation
Section 290 - OPERATOR′S CAB
Group 10 - Operational Check-Out
Group 15 - Tests and Adjustments
Group 20 - Theory of Operation
Section 299 - SPECIAL TOOLS
Group 05 - Special Tools (Dealer-Fabricated)
Group 10 - Special Tools and Test Equipment

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tm4648-DIAGNOSIS AND TESTS SERVICE MANUAL
tm4648-DIAGNOSIS AND TESTS SERVICE MANUAL
(g) by Belgreen
Foreword
This “Operation and Tests and Diagnostics” manual applies to the following tractor types:
6215, 6415, 6615 and 6715
The manual is written for experienced technicians. Essential tools required in performing
certain service work are identified in this manual and are recommended for use.
Live with safety: Read the safety messages in the introduction of this manual and the
cautions presented throughout the text of the manual. This is the safety-alert symbol.
This is the safety-alert symbol. When you see this symbol on your machine or in this
manual, be alert to the potential for personal injury.
Technical Manuals are concise guides for specific machines. They are on-the-job guides
containing only the vital information needed for diagnosis, analysis, testing, and repair.
Fundamental service information is available from other sources covering basic theory of
operation, fundamentals of troubleshooting, general maintenance, and basic type of failures
and their causes.

6. GENERAL INFORMATION
<- Go to Global Table of contents tm4648-DIAGNOSIS AND TESTS SERVICE MANUAL
(g) by Belgreen
Version date
01 July 2006

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tm4648-DIAGNOSIS AND TESTS SERVICE MANUAL
tm4648-DIAGNOSIS AND TESTS SERVICE MANUAL
(g) by Belgreen
Section 210 - GENERAL INFORMATION
Table of contents
Group 05 - Safety Measures .................................................................................................... 1
Recognize Safety Information ................................................................................................ 1
”Important” Information ......................................................................................................... 1
”Note” Information ................................................................................................................. 1
Prevent Machine Runaway ..................................................................................................... 1
Handle Fluids Safely-Avoid Fires ............................................................................................ 2
Prevent Battery Explosions .................................................................................................... 3
Prepare for Emergencies ........................................................................................................ 3
Prevent Acid Burns ................................................................................................................. 4
Avoid High-Pressure Fluids ..................................................................................................... 5
Service Cooling System Safely ............................................................................................... 5
Remove Paint Before Welding or Heating .............................................................................. 6
Avoid Heating Near Pressurized Fluid Lines ........................................................................... 7
Work In Ventilated Area ......................................................................................................... 7
Wear Protective Clothing ....................................................................................................... 8
Practice Safe Maintenance ..................................................................................................... 9
Park Machine Safely ............................................................................................................. 10
Use Proper Lifting Equipment ............................................................................................... 10
Construct Dealer-Made Tools Safely .................................................................................... 11
Support Machine Properly .................................................................................................... 11
Work in Clean Area .............................................................................................................. 12
Illuminate Work Area Safely ................................................................................................. 13
Service Machines Safely ....................................................................................................... 13
Use Proper Tools .................................................................................................................. 14
Service Tires Safely .............................................................................................................. 14
Service Front-Wheel Drive Tractor Safely ............................................................................ 16
Safety Information - Air Brake System ................................................................................. 16
Avoid Eye Contact With Radar ............................................................................................. 17
Keep ROPS Installed Properly ............................................................................................... 18
Replace Safety Signs ............................................................................................................ 18
Dispose of Waste Properly ................................................................................................... 19
Live With Safety ................................................................................................................... 20
Safety Measures on Electronic Control Units ........................................................................ 20
Group 15 - General References ............................................................................................. 22
Reference 210-15-001, General References - Summary ...................................................... 22
Reference 210-15-010, Unified Inch Bolt and Cap Screw Torque Values ............................. 23
Reference 210-15-015, Metric Bolt and Cap Screw Torque Values ...................................... 25
210-15-020, Hydraulic System Inch Fitting Torques ............................................................ 27
210-15-025, Hydraulic System Metric Fitting Torques ......................................................... 28
210-15-030, Component Identification Table ....................................................................... 29
Reference 210-15-035, How to Read a Functional Schematic .............................................. 30
210-15-040, How to Read a Diagnostic Schematic .............................................................. 30
210-15-042, Wire Numbers and Color Codes ....................................................................... 33
210-15-045, Schematic, Wiring and Harness Symbols ......................................................... 34
Reference 210-15-046, Troubleshooting Unsolved Problems ............................................... 36
210-15-050, Visual Check of the Electrical System .............................................................. 37

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tm4648-DIAGNOSIS AND TESTS SERVICE MANUAL
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Types of fault ....................................................................................................................... 38
Reference 210-15-060, Seven Step Electrical Test Procedure ............................................. 43 210-
15-065, Hydraulic System - Circuit Symbols ................................................................. 44

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 1
Group 05 - Safety Measures
”Note” Information
”Important” Information
Prevent Machine Runaway
Recognize Safety Information
This is a safety-alert symbol. When you see this symbol on your machine or in this manual, be
alert to the potential for personal injury.
Follow recommended precautions and safe operating practices.
Information marked as IMPORTANT points out problems that may lead to machine damage.
By following the directions given, these problems can be avoided.
When marked with NOTE the information given is more detailed or contains restrictions to
directions given previously. On the other hand useful information may be given belonging to
certain instructions without being directly connected to them.

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 2
When you work around fuel, do not smoke or work near heaters or other fire hazards.
Store flammable fluids away from fire hazards. Do not incinerate or puncture pressurized
containers.
Make sure machine is clean of trash, grease, and debris.
Avoid possible injury or death from machinery runaway.
Do not start engine by shorting across starter terminals. Machine will start in gear if normal
circuitry is bypassed.
NEVER start engine while standing on ground. Start engine only from operator’s seat, with
transmission in neutral or park.
Handle Fluids Safely-Avoid Fires

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Be prepared if a fire starts.
Do not store oily rags; they can ignite and burn spontaneously.
Keep sparks, lighted matches, and open flame away from the top of battery. Battery gas can
explode.
Never check battery charge by placing a metal object across the posts. Use a volt-meter or
hydrometer.
Do not charge a frozen battery; it may explode. Warm battery to 16°C (60°F).
Prepare for Emergencies
Prevent Battery Explosions

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Sulfuric acid in battery electrolyte is poisonous. It is strong enough to burn skin, eat holes in
clothing, and cause blindness if splashed into eyes.
Avoid the hazard by:
1.Filling batteries in a well-ventilated area.
2.Wearing eye protection and rubber gloves.
Keep a first aid kit and fire extinguisher handy.
Keep emergency numbers for doctors, ambulance service, hospital, and fire department near
your telephone.
Prevent Acid Burns

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3.Avoiding breathing fumes when electrolyte is added.
4.Avoiding spilling or dripping electrolyte.
5.Use proper jump start procedure.
If you spill acid on yourself:
1.Flush your skin with water.
2.Apply baking soda or lime to help neutralize the acid.
3.Flush your eyes with water for 15-30 minutes. Get medical attention immediately.
If acid is swallowed:
1.Do not induce vomiting.
2.Drink large amounts of water or milk, but do not exceed 2 L (2 quarts).
3.Get medical attention immediately.
Escaping fluid under pressure can penetrate the skin causing serious injury.
Avoid the hazard by relieving pressure before disconnecting hydraulic or other lines. Tighten
all connections before applying pressure.
Search for leaks with a piece of cardboard. Protect hands and body from high pressure fluids. If
an accident occurs, see a doctor immediately. Any fluid injected into the skin must be
surgically removed within a few hours or gangrene may result. Doctors unfamiliar with this
type of injury should reference a knowledgeable medical source. Such information is
available from Deere & Company Medical Department in Moline, Illinois, U.S.A.
Avoid High-Pressure Fluids

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Service Cooling System Safely
Remove Paint Before Welding or Heating
Avoid potentially toxic fumes and dust.
Hazardous fumes can be generated when paint is heated by welding, soldering, or using a
torch.
Remove paint before heating:
Explosive release of fluids from pressurized cooling system can cause serious burns.
Shut off engine. Only remove filler cap when cool enough to touch with bare hands. Slowly
loosen cap to first stop to relieve pressure before removing completely.

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Flammable spray can be generated by heating near pressurized fluid lines, resulting in
severe burns to yourself and bystanders. Do not heat by welding, soldering, or using a torch
near pressurized fluid lines or other flammable materials. Pressurized lines can accidentally
burst when heat goes beyond the immediate flame area.
Remove paint a minimum of 100 mm (4 in.) from area to be affected by heating. If paint
cannot be removed, wear an approved respirator before heating or welding.
If you sand or grind paint, avoid breathing the dust. Wear an approved respirator.
If you use solvent or paint stripper, remove stripper with soap and water before
welding. Remove solvent or paint stripper containers and other flammable material
from area. Allow fumes to disperse at least 15 minutes before welding or heating.
Do not use a chlorinated solvent in areas where welding will take place.
Do all work in an area that is well ventilated to carry toxic fumes and dust away.
Dispose of paint and solvent properly.
Work In Ventilated Area
Avoid Heating Near Pressurized Fluid Lines

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 8
Wear close fitting clothing and safety equipment appropriate to the job.
Engine exhaust fumes can cause sickness or death. If it is necessary to run an engine in an
enclosed area, remove the exhaust fumes from the area with an exhaust pipe extension.
If you do not have an exhaust pipe extension, open the doors and get outside air into the
area
Wear Protective Clothing

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 9
Prolonged exposure to loud noise can cause impairment or loss of hearing.
Wear a suitable hearing protective device such as earmuffs or earplugs to protect against
objectionable or uncomfortable loud noises.
Operating equipment safely requires the full attention of the operator. Do not wear radio or
music headphones while operating machine.
Understand service procedure before doing work. Keep area clean and dry.
Never lubricate, service, or adjust machine while it is moving. Keep hands, feet , and clothing
from power-driven parts. Disengage all power and operate controls to relieve pressure. Lower
Practice Safe Maintenance

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 10
Before working on the machine:
Lower all equipment to the ground.
Stop the engine and remove the key.
Disconnect the battery ground strap.
Hang a "DO NOT OPERATE" tag in operator station.
equipment to the ground. Stop the engine. Remove the key. Allow machine to cool.
Securely support any machine elements that must be raised for service work.
Keep all parts in good condition and properly installed. Fix damage immediately. Replace
worn or broken parts. Remove any buildup of grease, oil, or debris.
On self-propelled equipment, disconnect battery ground cable (-) before making adjustments
on electrical systems or welding on machine.
On towed implements, disconnect wiring harnesses from tractor before servicing electrical
system components or welding on machine.
Park Machine Safely
Use Proper Lifting Equipment

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 11
Lifting heavy components incorrectly can cause severe injury or machine damage.
Follow recommended procedure for removal and installation of components in the manual.
Faulty or broken tools can result in serious injury. When constructing tools, use proper,
quality materials, and good workmanship.
Do not weld tools unless you have the proper equipment and experience to perform the job.
Support Machine Properly
Construct Dealer-Made Tools Safely

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 12
Before starting a job:
Clean work area and machine.
Always lower the attachment or implement to the ground before you work on the machine. If the
work requires that the machine or attachment be lifted, provide secure support for them. If left
in a raised position, hydraulically supported devices can settle or leak down.
Do not support the machine on cinder blocks, hollow tiles, or props that may crumble under
continuous load. Do not work under a machine that is supported solely by a jack. Follow
recommended procedures in this manual.
When implements or attachments are used with a machine, always follow safety precautions
listed in the implement or attachment operator′s manual.
Work in Clean Area

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 13
Make sure you have all necessary tools to do your job.
Have the right parts on hand.
Read all instructions thoroughly; do not attempt shortcuts.
Illuminate your work area adequately but safely. Use a portable safety light for working inside
or under the machine. Make sure the bulb is enclosed by a wire cage. The hot filament of an
accidentally broken bulb can ignite spilled fuel or oil.
Tie long hair behind your head. Do not wear a necktie, scarf, loose clothing, or necklace when you
work near machine tools or moving parts. If these items were to get caught, severe injury could
result.
Service Machines Safely
Illuminate Work Area Safely

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Remove rings and other jewelry to prevent electrical shorts and entanglement in moving
parts.
Use tools appropriate to the work. Makeshift tools and procedures can create safety hazards.
Use power tools only to loosen threaded parts and fasteners.
For loosening and tightening hardware, use the correct size tools. DO NOT use U.S.
measurement tools on metric fasteners. Avoid bodily injury caused by slipping wrenches.
Use only service parts meeting John Deere specifications.
Use Proper Tools
Service Tires Safely

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 15
Explosive separation of a tire and rim parts can cause serious injury or death.
Do not attempt to mount a tire unless you have the proper equipment and experience to
perform the job.
Always maintain the correct tire pressure. Do not inflate the tires above the recommended
pressure. Never weld or heat a wheel and tire assembly. The heat can cause an increase in
air pressure resulting in a tire explosion. Welding can structurally weaken or deform the
wheel.
When inflating tires, use a clip-on chuck and extension hose long enough to allow you to
stand to one side and NOT in front of or over the tire assembly. Use a safety cage if available.
Check wheels for low pressure, cuts, bubbles, damaged rims or missing lug bolts and nuts.

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 16
Safety Information - Air Brake System
Service Front-Wheel Drive Tractor Safely
When servicing front-wheel drive tractor with the rear wheels supported off the ground and
rotating wheels by engine power, always support front wheels in a similar manner. Loss of
electrical power or transmission/ hydraulic system pressure will engage the front driving
wheels, pulling the rear wheels off the support if front wheels are not raised. Under these
conditions, front drive wheels can engage even with switch in disengaged position.

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 17
CAUTION:
Compressed air tank is pressurized!
Always relieve pressure before working on the air brake system. Do not carry out any welding
jobs on the air brake system.
Avoid Eye Contact With Radar

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 18
Radar ground speed sensor emits a very low intensity microwave signal. It will not cause any
ill effects during normal use. Although intensity is low, DO NOT look directly into face of
sensor while in operation, to avoid any possible eye damage.
Make certain all parts are reinstalled correctly if the roll-over protective structure (ROPS) is
loosened or removed for any reason. Tighten mounting bolts to proper torque.
The protection offered by ROPS will be impaired if ROPS is subjected to structural damage, is
involved in an overturn incident, or is in any way altered by welding, bending, drilling, or
cutting. A damaged ROPS should be replaced, not reused.
Keep ROPS Installed Properly

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 19
Replace Safety Signs
Dispose of Waste Properly
Replace missing or damaged safety signs. See the machine operator’s manual for correct
safety sign placement.
Improperly disposing of waste can threaten the environment and ecology. Potentially harmful
waste used with John Deere equipment include such items as oil, fuel, coolant, brake fluid,
filters, and batteries.
Use leakproof containers when draining fluids. Do not use food or beverage containers that
may mislead someone into drinking from them.
Do not pour waste onto the ground, down a drain, or into any water source.

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Section 210 - GENERAL INFORMATION Group 05: Safety Measures
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Section 210 page 20
Before returning machine to customer, make sure machine is functioning properly, especially the
safety systems. Install all guards and shields.
Air conditioning refrigerants escaping into the air can damage the Earth’s atmosphere.
Government regulations may require a certified air conditioning service center to recover and
recycle used air conditioning refrigerants.
Inquire on the proper way to recycle or dispose of waste from your local environmental or
recycling center, or from your John Deere dealer.
Live With Safety
Safety Measures on Electronic Control Units

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Section 210 - GENERAL INFORMATION Group 15: General References
tm4648-DIAGNOSIS AND TESTS
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Section 210 page 21
CAUTION:
Always engage the park lock when performing tests with the engine
running.
IMPORTANT:
Do not use a test lamp on any control unit. Only use a multimeter
(JT05791A).
IMPORTANT:
To protect electronic circuits, disconnect the battery and alternator before
performing any welding on the tractor.
CAUTION:
Before installing test equipment on tractor, always shut off the engine and
turn the key switch “OFF”.
CAUTION:
When testing is performed with the engine running, there is a risk of injury
from rotating parts.

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Section 210 - GENERAL INFORMATION Group 15: General References
tm4648-DIAGNOSIS AND TESTS
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Section 210 page 22
Group 15 - General References
Reference 210-15-001, General References -
Summary
The following list contains additional references which may be helpful when diagnosing the
machine.
General Information
Reference 210-15-010 , Unified Inch Bolt and Cap Screw Torque Values
Reference 210-15-015 , Metric Bolt and Cap Screw Torque Values
Reference 210-15-020 , Hydraulic System Inch Fitting Torques
Reference 210-15-025 , Hydraulic System Metric Fitting Torques
Electrical System
Reference 210-15-030, Component identification table
Reference 210-15-035, How to read a functional schematic
Reference 210-15-040, How to read a diagnostic schematic
Reference 210-15-042, Wire numbers and color codes
Reference 210-15-045, Schematic, wiring and harness symbols
Reference 210-15-050, Electrical system visual check
Reference 210-15-055, Electrical circuit malfunctions
Reference 210-15-060, Seven-step electrical test procedure
Hydraulics
Reference 210-15-065 , Hydraulic circuit symbols