John Deere 204L 304L Compact 4WD Loader Operation And Test Technical Manual TM14271X19 2022

Description

Contents:
Introduction
Foreword
Manual Identification—READ THIS FIRST!
Contents
General Information
Safety Information
Recognize Safety Information
Follow Safety Instructions
Operate Only If Qualified
Wear Protective Equipment
Protect Against Noise
Avoid Unauthorized Machine Modifications
Inspect Machine
Stay Clear of Moving Parts
Avoid High-Pressure Fluids
Avoid High-Pressure Oils
Work In Ventilated Area
Avoid Static Electricity Risk When Refueling
High Debris Applications
Prevent Fires, Clean Debris From Machine
In Case of Machine Fire
Prevent Battery Explosions
Handle Chemical Products Safely
Handle Starting Fluid Safely
Decommissioning — Proper Recycling and Disposal of Fluids and Components
Exhaust Filter Ash Handling and Disposal
Prepare for Emergencies
Clean Debris from Machine
Add Cab Guarding for Special Uses
Use Steps and Handholds Correctly
Start Only From Operator′s Seat
Use and Maintain Seat Belt
Prevent Unintended Machine Movement
Avoid Work Site Hazards
Use Special Care When Operating Loader
Keep Riders Off Machine
Avoid Backover Accidents
Avoid Machine Tip Over and Machine Damage
Avoid Power Lines
Operating on Slopes
Operating or Traveling On Public Roads
Inspect and Maintain ROPS
Travel Safely
Prevent Acid Burns
Add and Operate Attachments Safely
Park and Prepare for Service Safely
Service Machines Safely
Service Cooling System Safely
Remove Paint Before Welding or Heating
Make Welding Repairs Safely
Drive Metal Pins Safely
Service Tires Safely
Use Proper Lifting Equipment
Clean Exhaust Filter Safely
Diagnostic Trouble Codes (DTC)
Engine Control Unit (ECU) Diagnostic Trouble Codes
Engine Control Unit (ECU) Diagnostic Trouble Codes
Accelerator Sensor 3 Error (Foot Pedal in Open Position)
Accelerator Sensor 3 Error (Foot Pedal in Closed Position)
Accelerator Sensor 2 Error (High Voltage)
Accelerator Sensor 2 Error (Low Voltage)
Accelerator Sensor 3 Error (High Voltage)
Accelerator Sensor 3 Error (Low Voltage)
Pulse Sensor Error (Pulse Communication)
Intake Throttle Opening Sensor Fault (High Voltage)
Intake Throttle Opening Sensor Fault (Low Voltage)
Acceleration Sensor 1 Fault (High Voltage)
Acceleration Sensor 1 Fault (Low Voltage)
Low Oil Pressure Fault Alarm
Oil Pressure Switch Open Circuit
Exhaust Gas Recirculation (EGR) Low Pressure Side Sensor Fault (High Voltage)
Exhaust Gas Recirculation (EGR) Low Pressure Side Sensor Fault (Low Voltage)
Exhaust Gas Recirculation (EGR) Low Pressure Side Sensor Fault (Detected Value Error)
Exhaust Gas Recirculation (EGR) Low Pressure Side Sensor (Abnormal Learning Value)
Intake Air Temperature Sensor Fault (High Voltage)
Intake Air Temperature Sensor Fault (Low Voltage)
Intake Air Temperature Sensor Fault (Detected Value Error)
Atmospheric Pressure Sensor Fault (High Voltage)
Atmospheric Pressure Sensor Fault (Low Voltage)
Atmospheric Pressure Sensor Characteristic Fault
Cooling Water Temperature Sensor Temperature Abnormal High (Overheat)
Cooling Water Temperature Sensor Fault (High Voltage)
Cooling Water Temperature Sensor Fault (Low Voltage)
Cooling Water Temperature Sensor Fault (Detected Value Error)
Actual Rail Pressure Rise Error
Rail Pressure Sensor Fault (High Voltage)
Rail Pressure Sensor Fault (Low Voltage)
Rail Pressure Deviation Error During the Actual Rail Pressure Rise
Pressure Limit Valve (PLV) Open Valve
Rail Pressure Deviation Error During the Actual Rail Pressure Drop
Charge Alarm
Charge Switch Open Circuit
New Air Temperature Sensor Fault (High Voltage)
New Air Temperature Sensor Fault (Low Voltage)
Exhaust Air Temperature Sensor Fault (High Voltage)
Exhaust Air Temperature Sensor Fault (Low Voltage)
Exhaust Air Temperature Sensor Fault (Detected Value Error)
Fuel Temperature Sensor Temperature Abnormal High
Fuel Temperature Sensor Fault (High Voltage)
Fuel Temperature Sensor Fault (Low Voltage)
Overspeed
VI (CAN Message) Reception Data Fault
VI (CAN Message) Reception Time Out
Exhaust Gas Recirculation (EGR) Gas Temperature Sensor Fault (High Voltage)
Exhaust Gas Recirculation (EGR) Gas Temperature Sensor Fault (Low Voltage)
Exhaust Gas Recirculation (EGR) Gas Temperature Sensor Fault (Detected Value Error)
EEPROM Memory Deletion Error
High Pressure Pump Drive Circuit (High Side VB Short Circuit)
High Pressure Pump Drive Circuit (Open Circuit)
High Pressure Pump Drive Circuit (High Side Ground Short Circuit)
Injector 1 Short Circuit (4TNV)
Injector 1 Open Circuit (Inherent Location of the Injector) (4TNV)
Injector 1 Coil Short Circuit (4TNV)
Injector 4 Short Circuit
Injector 4 Open Circuit (Inherent Location of the Injector)
Injector 4 Coil Short Circuit
Injector 2 Short Circuit
Injector 2 Open Circuit (Inherent Location of the Injector)
Injector 2 Coil Short Circuit
Injector 3 Short Circuit
Injector 3 Open Circuit (Inherent Location of the Injector)
Injector 3 Coil Short Circuit
Exhaust Gas Recirculation (EGR) High Pressure Side Sensor Fault (High Voltage)
Exhaust Gas Recirculation (EGR) High Pressure Side Sensor Fault (Low Voltage)
Exhaust Gas Recirculation (EGR) High Pressure Side Sensor Fault (Detected Value Error)
Exhaust Gas Recirculation (EGR) High Pressure Side Sensor (Abnormal Learning Value)
Engine Start Relay (K02) Early Opening
Engine Start Relay (K02) Contact Stuck
Exhaust Gas Recirculation (EGR) High Voltage Malfunction
Exhaust Gas Recirculation (EGR) Low Voltage Malfunction
Exhaust Gas Recirculation (EGR) Feedback Malfunction
Exhaust Gas Recirculation (EGR) Data Error
Open Circuit Between the Exhaust Gas Recirculation (EGR) Motor Coils
Injector Drive Circuit (Bank1) Short Circuit
Injector Drive Circuit (Bank2) Short Circuit
Power Short Circuit of Throttle Valve Drive H Bridge Output 1
Ground Short Circuit of Throttle Valve Drive H Bridge Output 1
No Load of Throttle Valve Drive H Bridge Circuit
Overload On The Drive H Bridge Circuit of Throttle Valve
VB Power Short Circuit of Throttle Valve Drive H Bridge Output 2
Ground Short Circuit of Throttle Valve Drive H Bridge Output 2
DPF Inlet Temperature Sensor Temperature Abnormal High
DPF Inlet Temperature Sensor Fault (High Voltage)
DPF Inlet Temperature Sensor Fault (Low Voltage)
DPF Inlet Temperature Sensor Fault (Detected Value Error)
DPF Intermediate Temperature Sensor Temperature Abnormal High (Post-Injection Error)
DPF Intermediate Temperature Sensor Temperature Abnormal Low Temperature
DPF Intermediate Temperature Sensor Fault (High Voltage)
DPF Intermediate Temperature Sensor Fault (Low Voltage)
DPF Intermediate Temperature Sensor Fault (Detected Value Error)
DPF Differential Pressure Sensor Differential Pressure Abnormal High
DPF Differential Pressure Sensor Fault (High Voltage)
DPF Differential Pressure Sensor Fault (Low Voltage)
DPF Differential Pressure Sensor (Abnormal Learning Value)
DPF High Pressure Side Sensor Fault (High Voltage)
DPF High Pressure Side Sensor Fault (Low Voltage)
DPF High Pressure Side Sensor Fault (Detected Value Error)
DPF Reset Regeneration Prohibited
Backup Mode
DPF OP Interface Recovery Regeneration Prohibition
DPF OP Interface Recovery Regeneration Error
Ash Cleaning Request 2
Ash Cleaning Request 1
Injector Drive IC Error
Exhaust Filter Fault (Detected Value Error)
Exhaust Gas Recirculation (EGR) High Temperature Thermistor Malfunction
Exhaust Gas Recirculation (EGR) Low Temperature Thermistor Malfunction
Start Assist Relay Interrupted
Startup Assist Relay Ground Interrupted
Air Cleaner Clogged Alarm
Oil/Water Separator Alarm
Crank Speed Sensor
No Crank Signal
Cam Signal Malfunction
No Cam Signal
Angle Offset Error
Exhaust Throttle (MPU fault)
SCV (MPROP) High Pressure Pump Drive Circuit (Low Side VB Short Circuit)
High Pressure Pump Drive Circuit (Low Side Ground Short Circuit)
High Pressure Pump Drive Circuit (Drive Current) (High Level)
High Pressure Pump Drive Circuit (Pump Overload Error)
Overaccumulation (Method C)
Overaccumulation (Method P)
Regeneration Defect (Stationary Regeneration Error)
EEPROM Memory Read Error
Regeneration Defect (Stationary Regeneration Not Performed)
EEPROM Memory Write Error
Short Circuit Between the Exhaust Gas Recirculation (EGR) Motor Coils
Exhaust Gas Recirculation (EGR) Position Sensor Malfunction
Exhaust Gas Recirculation (EGR) Valve Stuck Open Malfunction
Exhaust Gas Recirculation (EGR) Valve Initialization Malfunction
CY146 SPI Communication Error
Excessive Supply 1 Voltage Error
Insufficient Supply 1 Voltage Error
Sensor Supply Voltage Error 1
Sensor Supply Voltage Error 2
Sensor Supply Voltage Error 3
TSC1 (CAN Message) Reception Time Out Error (SA1)
TSC1 (CAN Message) Reception Time Out Error
Y_ECR1 (CAN Message) Reception Time Out Error
Y_EC (CAN Message) Reception Time Out Error
Y_RSS (CAN Message) Reception Time Out
VH (CAN Message) Reception Time Out
Y_ECM3 (CAN Message) Reception Time Out
Y_ETCP1 (CAN Message) Reception Time Out Error
CAN1 (For EGR) Reception Time Out Error
Exhaust Throttle (CAN Message From the Exhaust Throttle Time Out)
Exhaust Gas Recirculation (EGR) Valve Target Value Out of Range
EBC1 (CAN Message) Reception Time Out
Y_DPFIF (CAN Message) Reception Time Out
Dual Accelerator Sensor (Open Position) Error
Dual Accelerator Sensor (Closed Position) Error
Actuator Drive Circuit 1 Short to Ground
Exhaust Throttle (Voltage Error)
Exhaust Throttle (Motor Error)
Exhaust Throttle (Sensor System Error)
Exhaust Throttle (MPU Error)
Exhaust Throttle (PCB Error)
Exhaust Throttle (CAN Error)
Actuator Drive Circuit 2 Ground Short Circuit
No Signal on Both Crank and Cam Speed Sensor
Rail Pressure Error (Operation Time Error During RPS Limp Home)
IQA Corrected Injection Amount For Injector 1 Error
IQA Corrected Injection Amount For Injector 2 Error
IQA Corrected Injection Amount For Injector 3 Error
IQA Corrected Injection Amount For Injector 4 Error
Rail Pressure Error (Controlled Rail Pressure Error After PLV Valve Opening)
Rail Pressure Error (The Number of Times the PLV Valve Opens Error)
Rail Pressure Error (The Time of PLV Valve Opening Error)
Engine Control Unit (ECU) Internal Error (Actuator Drive Circuit 3 Short to Ground)
Engine Control Unit (ECU) Internal Error (AD Converter Error 1)
Engine Control Unit (ECU) Internal Error (AD Converter Error 2)
Engine Control Unit (ECU) Internal Error (External Monitoring IC And CPU Error 1)
Engine Control Unit (ECU) Internal Error (External Monitoring IC And CPU Error 2)
Engine Control Unit (ECU) Internal Error (ROM Error)
Engine Control Unit (ECU) Internal Error (Shutoff Path Error 1)
Engine Control Unit (ECU) Internal Error (Shutoff Path Error 2)
Engine Control Unit (ECU) Internal Error (Shutoff Path Error 3)
Engine Control Unit (ECU) Internal Error (Shutoff Path Error 4)
Engine Control Unit (ECU) Internal Error (Shutoff Path Error 5)
Engine Control Unit (ECU) Internal Error (Shutoff Path Error 6)
Engine Control Unit (ECU) Internal Error (Shutoff Path Error 7)
Engine Control Unit (ECU) Internal Error (Shutoff Path Error 8)
Engine Control Unit (ECU) Internal Error (Shutoff Path Error 9)
Engine Control Unit (ECU) Internal Error (Shutoff Path Error 10)
Engine Control Unit (ECU) Internal Error (Recognition Error of Engine Speed)
Rail Pressure Error (The Actual Rail Pressure is Too High During PRV Limp Home)
Rail Pressure Error (Injector B/F Temperature Error During PLV4 Limp Home)
Monitor Display Diagnostic Trouble Codes
Monitor Display Diagnostic Trouble Codes
Central Control Unit (CCU) Diagnostic Trouble Codes
Engine Throttle Pedal Position Signal 2 Circuit Fault
Engine Throttle Pedal Position Signal 1 Circuit Fault
Engine Throttle Pedal Position Fault
Unswitched Power Voltage High
Unswitched Power Voltage Low
Engine Speed Data Incorrect
CCU Internal Error
CCU Fault
Controller CAN 0 Fault
Hydrostatic Drive Pump Forward Solenoid Circuit Fault
Hydrostatic Drive Pump Forward Solenoid
CCU CAN Fault
CAN Comm Lost For ECU
Auxiliary Circuit Fault
Auxiliary Fault
CCU Sensor Supply Circuit Fault
Hydrostatic Drive Pump Reverse Solenoid Circuit Fault
Hydrostatic Drive Pump Reverse Solenoid Fault
FNR Reverse Circuit Fault
FNR Forward Circuit Fault
Creep Control Solenoid Circuit Fault
Creep Control Solenoid Fault
CCU Temperature
Park Brake Solenoid Circuit Fault
Park Brake Circuit Fault
FNR Selector Fault
Creep Control Potentiometer Circuit Fault
Creep Control Potentiometer Fault
Hydrostatic Drive Pump Direction Solenoid Circuit Fault
Hydrostatic Drive Pump Direction Solenoid Fault
Third Function Proportional B Circuit Fault
Third Function Proportional A Circuit Fault
Operational Checkout Procedure
Operational Checkout Procedure
Operational Checkout
Engine
Theory of Operation
Yanmar Engine
System Diagrams
Engine Cooling System Component Location
Engine Intake and Exhaust System Component Location
Diagnostic Information
Adjustments
Service Filter Cleaning
Tests
Engine Idle Speeds Check
Electrical System
Power Circuit Theory of Operation
Unswitched Power Distribution
Switched Power Distribution
Start and Charge Circuits Theory of Operation
Unswitched Power
Switched Power
Start Circuit Operation
Charge Circuit Operation
Cold Start Aid Circuit Theory of Operation
Controller Area Network (CAN) Theory of Operation
Park Brake Release Circuit Theory of Operation
(S.N. —56790)
(S.N. 52511), (S.N. 52710), (S.N. 56148), (S.N. 56167), (S.N. 56791— )
Forward, Reverse, Speed Range, and Backup Alarm Circuits Theory of Operation
Working Hydraulics Lockout Circuit Theory of Operation
Working Hydraulics Lockout Operation
Third Function Circuit Theory of Operation
Ride Control Circuit Theory of Operation
Hazard and Turn Lights Circuits Theory of Operation
Headlights, Marker Lights, and Horn Circuits Theory of Operation—Canopy
Headlights, Marker Lights, and Horn Circuits Theory of Operation—Cab
Quik-Tatch™ Circuit Theory of Operation
Air Conditioner Circuit Theory of Operation
Central Control Unit (CCU) Circuit Theory of Operation (S.N. 52511), (S.N. 52710), (S.N. 56148), (S.N. 56167), (S.N. 56791— )
Electrical Diagram Information
Electrical Schematic Symbols
Fuse and Relay Specifications
(S.N 52511), (S.N. 52710), (S.N. 56148), (S.N. 56167), (S.N. 56791— )
System Functional Schematic, Component Location, and Wiring Diagram Master Legend—Cab
System Functional Schematic—Cab
System Functional Schematic, Component Location, and Wiring Diagram Master Legend—Canopy
System Functional Schematic—Canopy
Engine Harness (W6) Component Location
Engine Harness (W6) Wiring Diagram
Loader/Rear Frame Harness (W7) Component Location
Loader/Rear Frame Harness (W7) Wiring Diagram
Cab Harness (W8) Component Location
Cab Harness (W8) Wiring Diagram
Canopy Harness (W9) Component Location
Canopy Harness (W9) Wiring Diagram
Service ADVISOR™ Harness (W11) Component Location
Service ADVISOR™ Harness (W11) Wiring Diagram
Quik-Tatch™ Harness (W12) Component Location
Quik-Tatch™ Harness (W12) Wiring Diagram
Quik-Tatch™ Extension Harness (W13) Component Location
Quik-Tatch™ Extension Harness (W13) Wiring Diagram
Electrohydraulic (EH) Harness (W14) Component Location—Cab Machines Only (S.N. —56790)
Electrohydraulic (EH) Harness (W14) Wiring Diagram—Cab Machines Only (S.N. —56790)
Electrohydraulic (EH) Control Harness (W15) Component Location—Cab Machines Only (S.N. —56790)
Electrohydraulic (EH) Control Harness (W15) Wiring Diagram—Cab Machines Only (S.N. —56790)
Ride Control Harness (W16) Component Location—Cab Machines Only
Ride Control Harness (W16) Wiring Diagram—Cab Machines Only
Ride Control Extension Harness (W17) Component Location
Ride Control Extension Harness (W17) Wiring Diagram
3rd Function Continuous Flow Harness (W18) Component Location—Cab Machines Only (S.N. 52511), (S.N. 52710), (S.N. 56148), (S.N. 56167), (S.N. 56791— )
3rd Function Continuous Flow Harness (W18) Wiring Diagram—Cab Machines Only (S.N. 52511), (S.N. 52710), (S.N. 56148), (S.N. 56167), (S.N. 56791— )
Service ADVISOR™ Diagnostic Application
Service ADVISOR™ Connection Procedure
Reading Diagnostic Trouble Codes With Service ADVISOR™ Diagnostic Application
Intermittent Diagnostic Trouble Code (DTC) Diagnostics
Diagnostic Trouble Code Designations
Electrical Component Specifications
Setting Service Hours in Monitor Display
Controller Area Network (CAN) Circuit Test
Alternator Test
Wire Harness Test
Engine Control Unit (ECU) Replacement Calibration
Fuel Pump Replacement Calibration
Yanmar Display Calibration Values Test
Engine Speed Control Pedal Sensor Test
Sensor Circuit Check
Return-to-Dig Adjustment
Connector Terminal Test
Power Train
Theory Of Operation
Power Train Operation
Hydrostatic Transmission Operation—Neutral
Hydrostatic Transmission Operation—Forward (Low Speed)
Hydrostatic Pump
Hydrostatic Motor
Hydrostatic Transmission Operation—Forward (High Speed)
Hydrostatic Transmission Operation—Reverse (Low Speed)
Hydrostatic Pump Operation
Hydrostatic Pump Swash Plate Operation
Hydrostatic Pump Control Operation—Reverse (Engine Speed at Less Than Fast Idle)
Hydrostatic Pump Control Operation—Forward (Engine Speed at Fast Idle)
High-Pressure Relief Valve Operation
Pressure Relief Valve
Make-Up Check Valve
Hydrostatic Motor Operation—Neutral
Hydrostatic Motor Operation—Reverse (Low Speed)
Hydrostatic Motor Operation—Forward (High Speed)
Gear Case Operation
Inching Valve Operation
Brake Valve Operation
Service and Park Brake Operation
Service Brakes
Park Brake
Park Brake Release Solenoid Valve Operation
Creep Control Valve Operation
Differential Limited Slip Operation
Power Train Component Location
Service and Park Brake System Component Location
Hydrostatic Transmission Schematic
Service Brake and Park Brake System Schematic
Machine Does Not Move
Machine Does Not Move at Low Idle
Machine Moves in One Direction Only
Machine Drives Erratically
Machine Moves in Wrong Direction
Cannot Find or Hold Neutral
Hydraulic Oil Overheats
Lack of Power or Sluggish
Foaming Oil
Machine Vibrates
Differential Low on Oil
Excessive Differential and/or Axle Noise
Oil Seeping From Outer Axle Seal
Axle Overheats
Excessive Driveline Vibration or Noise
Park Brake Will Not Hold
Park Brake Overheats
Park Brake Indicator in Monitor Does Not Come ON When Park Brake Applied
Park Brake Will Not Apply
Park Brake Will Not Release
Poor or No Service Brakes
Service Brakes Aggressive
Service Brakes Dragging
Service Brakes Chatter
Hydrostatic Motor Minimum Displacement Adjustment
Brake/Inching Pedal Linkage Adjustment
Service Brakes (Wet Disc) Inspection
Drum Brake Inspection
Before Performing Hydrostatic Transmission Tests
Neutral Charge Relief Valve Pressure Test and Adjustment
Hydrostatic Pump Begin Regulation Test and Adjustment
Hydrostatic Pump Performance (Timing) Test and Adjustment
High-Pressure Relief Valve Test and Adjustment
Hydrostatic Pump Pressure Override (POR) Valve Pressure Test and Adjustment
Hydrostatic Motor Begin Regulation of Displacement Control Valve Test and Adjustment
Hydrostatic Pump Isolation Procedure
Hydrostatic Adjusting Screws (With Tamper-Proof Caps)
Hydraulic System
Hydraulic System Operation
Hydraulic Pump Operation
Priority Valve Operation
Orbital Steering Circuit Operation
Orbital Steering Valve Operation
Steering Cylinder Relief Valve Operation
Loader Control Valve Operation
Loader Control Valve Operation—Boom Section
Loader Control Valve Operation—Bucket Section
Loader Control Valve Operation—Auxiliary Section
Loader System Relief Valve Operation
Loader Control Valve Circuit Relief Valve With Anticavitation Operation
Circuit Relief Valve Anticavitation Operation
Boom Lower Anticavitation Valve Operation
Ride Control Valve Operation
Hydraulic Enable Solenoid Operation
Return/Suction Filter Operation
Hydraulic System Schematic
Orbital Steering System Schematic
Loader Hydraulic System Component Location
Orbital Steering System Component Location
No Hydraulic Functions
Slow Hydraulic Functions
Noisy Hydraulic Pumps
Boom Float Function Does Not Work
One Hydraulic Function Does Not Work
Low Hydraulic Power
Function Drifts Down
Boom Down Does Not Work (Engine Off)
Oil Overheats
Function Drops Before Rising When Valve is Activated
Hydraulic Oil Foams
No Steering Functions
Constant Steering to Maintain Straight Travel
No Steering Function During Slow Steering Wheel Movement
Steering Wheel Turns With No Resistance and Causes No Frame Movement
Erratic Steering
Spongy or Soft Steering
Free Play at Steering Wheel
Steering Wheel Does Not Immediately Return to Neutral When Released
Orbital Steering Valve Locks Up
Abrupt Steering Wheel Oscillation
Steering Wheel Turns by Itself
Machine Turns in Opposite Direction
Machine Turns When Orbital Steering Valve Is in Neutral
Test
Hydraulic Oil Warm-Up Procedure
Hydraulic System Pressure Discharge Procedure
JT02156A Digital Pressure and Temperature Analyzer Kit Installation
Orbital Steering System Relief Valve Pressure Test
Steering Cylinder Leakage Test
Loader System Relief Valve Pressure Test
Loader Circuit Relief Valve Pressure Test
Ride Control System Relief Valve Pressure Test
Loader Cylinder Drift Test
Boom and Bucket Cylinder Leakage Test
Heating and Air Conditioning
Air Conditioning System Cycle of Operation
Air Conditioner and Heater Component Location
Air Conditioning System Does Not Operate
Air Conditioning System Does Not Cool Interior of Cab
Air Conditioning System Runs Constantly, Too Cold
Heating System Does Not Operate
Heating System Does Not Warm Interior of Cab
Interior Windows Continue to Fog
R134a Refrigerant Cautions and Proper Handling
R134a Oil Charge Capacity
R134a Refrigerant Charge Capacity
Heater and Air Conditioner Operational Checks
Air Conditioner Compressor Clutch Test
R134a Refrigerant Leak Test
R134a Refrigerant Hoses and Tubing Inspection
Air Conditioner High/Low-Pressure Switch Test
Air Conditioner Freeze Control Switch Test
Operating Pressure Diagnostic Chart