Repair and Diagnosis
- A L L Diagnostic Trouble Codes ( DTC )
- Relays and Modules
- Relays and Modules - Accessories and Optional Equipment
- Relays and Modules - Body and Frame
- Relays and Modules - Brakes and Traction Control
- Relays and Modules - Cooling System
- Relays and Modules - Engine
- Relays and Modules - Instrument Panel
- Relays and Modules - Lighting and Horns
- Relays and Modules - Power and Ground Distribution
- Relays and Modules - Powertrain Management
- Relays and Modules - Restraints and Safety Systems
- Relays and Modules - Steering and Suspension
- Sensors and Switches
- Sensors and Switches - Accessories and Optional Equipment
- Sensors and Switches - Body and Frame
- Sensors and Switches - Brakes and Traction Control
- Sensors and Switches - Cooling System
- Sensors and Switches - Cruise Control
- Sensors and Switches - Engine
- Sensors and Switches - HVAC
- Sensors and Switches - Instrument Panel
- Sensors and Switches - Lighting and Horns
- Sensors and Switches - Powertrain Management
- Sensors and Switches - Restraints and Safety Systems
- Sensors and Switches - Starting and Charging
- Sensors and Switches - Steering and Suspension
- Maintenance
- Alignment
- Tune-up and Engine Performance Checks
- Timing Component Alignment Marks
- Drive Belt
- Filters
- Hoses
- Fluids
- Brake Bleeding
- Air Bag(s) Arming and Disarming
- Fuses and Circuit Breakers
- Service Reminder Indicators
- Wheels and Tires
- Jump Starting
- Application and ID
Description and Operation- Service Intervals
Locations
Service and Repair
Specifications
Technical Service Bulletins
- Engine, Cooling and Exhaust
- Engine
- Actuators and Solenoids - Engine
- Compression Check
- Camshaft, Lifters and Push Rods
- Cylinder Block Assembly
- Cylinder Head Assembly
- Drive Belts, Mounts, Brackets and Accessories
- Engine Lubrication
- Intake Manifold
- Lamps and Indicators - Engine
- Relays and Modules - Engine
- Seals and Gaskets
- Sensors and Switches - Engine
- Timing Components
- Tune-up and Engine Performance Checks
- Water Pump
Service Precautions- Specifications
- Technical Service Bulletins
- Cooling System
- Auxiliary Water Pump
- Coolant
- Coolant Level Sensor
- Coolant Line/Hose
- Coolant Reservoir
- Radiator Cooling Fan
- Engine - Coolant Temperature Sensor/Switch
- Fan Shroud
- Heater Control Valve
- Heater Core
- Lamps and Indicators - Cooling System
- Radiator
- Radiator Cap
- Relays and Modules - Cooling System
- Sensors and Switches - Cooling System
- Temperature Gauge
- Thermostat
- Water Pump
- Service Precautions
- Description and Operation
Testing and Inspection- Service and Repair
- Specifications
- Technical Service Bulletins
Tools and Equipment
- Exhaust System
- Technical Service Bulletins
- Engine
- Powertrain Management
- Relays and Modules - Powertrain Management
- Sensors and Switches - Powertrain Management
- Tune-up and Engine Performance Checks
- Computers and Control Systems
- Air Flow Meter/Sensor
- Camshaft Position Sensor
- Central Electronics Box
- Coolant Temperature Sensor/Switch (For Computer)
- Data Link Connector
- Electronic Throttle Actuator
- Engine Control Module
- Fuel Tank Pressure Sensor
- Idle/Throttle Speed Control Unit
- Information Bus
- Knock Sensor
- Main Relay (Computer/Fuel System)
- Oil Level Sensor For ECM
- Oil Pressure Sensor
- Relays and Modules - Computers and Control Systems
- Sensors and Switches - Computers and Control Systems
- Throttle Position Sensor
- Variable Valve Timing Actuator
- Variable Valve Timing Control Module
- Variable Valve Timing Solenoid
- Description and Operation
- Air Intake System
- Cruise Control Operation
- EDR Safety Concept
- EDR Throttle Position Feedback Signals
- Engine Throttle Control (EDR)
- Engine Torque Calculation
- Idle Control System - ZWD 5
- Introduction - DME MS S52 Engine Management System
- Note on: Schematics, Control Units, Switches, Relays
- Input Signals/Components
- Power Supply and Grounds
- Camshaft Position Sensors
- Crankshaft Position Sensor
- Hot Film Air Mass Sensor
- Intake Air Temperature
- Engine Coolant Temperature Sensor
- Oil Temperature/Level Sensor
- Throttle Progression Switch
- Power Transmission Switch
- Oxygen Sensors
- Knock Sensors
- Catalytic Converter Temperature Monitoring
- Integrated Ambient Barometric Pressure Sensor
- Outputs
- Main Relay Control
- Fuel Pump Relay
- Non Return Fuel Rail System
- E Box Fan Control
- Secondary Air Injection
- Auxiliary Fan Control
- Vanos Solenoid Control
- Oil Sump Changeover Valves
- Injector Control
- Ignition Coil Triggering
- Oxygen Sensor Heating
- Idle Control Valve
- Purge Control Valve
- DM-TL (Diagnosis Module - Tank Leakage)
- Secondary Air Injection
- Throttle Position Sensor (PWG)
- Testing and Inspection
- Technical Service Bulletins
- Emission Control Systems
- Fuel Delivery and Air Induction
- Fuel Pressure
- Idle Speed
- Accelerator Pedal
- Air Cleaner Housing
- Air Flow Meter/Sensor
- Fuel
- Fuel Filler Cap
- Fuel Filter
- Fuel Injector
- Fuel Pressure Regulator
- Fuel Pump
- Fuel Rail
- Fuel Return Line
- Fuel Supply Line
- Fuel Tank
- Fuel Tank Unit
- Idle/Throttle Speed Control Unit
- Intake Air Duct
- Intake Air Plenum
- Main Relay (Computer/Fuel System)
- Relays and Modules - Fuel Delivery and Air Induction
- Sensors and Switches - Fuel Delivery and Air Induction
- Throttle Body
- Throttle Cable/Linkage
- Throttle Position Sensor
- Service Precautions
- Description and Operation
Adjustments- Technical Service Bulletins
- Tools and Equipment
- Ignition System
- Transmission Control Systems
- PROM - Programmable Read Only Memory
- Description and Operation
- Technical Service Bulletins
- Transmission and Drivetrain
- Automatic Transmission/Transaxle
- Automatically Shifted Manual Transmission/Transaxle
- Clutch
- Differential Assembly
- Drive Axles, Bearings and Joints
- Drive/Propeller Shafts, Bearings and Joints
- Flex Plate
- Flywheel
- Manual Transmission/Transaxle
- Transmission Control Systems
- Description and Operation
- Specifications
- Technical Service Bulletins
- Tools and Equipment
- Brakes and Traction Control
- Antilock Brakes / Traction Control Systems
- Brake Bleeding
- Brake Pedal Assy
- Disc Brake System
- Hydraulic System
- Parking Brake System
- Power Brake Assist
- Relays and Modules - Brakes and Traction Control
- Sensors and Switches - Brakes and Traction Control
- Description and Operation
- Testing and Inspection
- Specifications
- Starting and Charging
- Sensors and Switches - Starting and Charging
- Battery
- Charging System
- Starting System
- Power and Ground Distribution
- Fuse Block
- Power Distribution Module
- Relays and Modules - Power and Ground Distribution
- Wiring Harness
- Application and ID
- Description and Operation
- Service and Repair
- Specifications
- Technical Service Bulletins
- Service and Repair
- Specifications
- Technical Service Bulletins
- Power and Ground Distribution
- Fuse Block
- Power Distribution Module
- Relays and Modules - Power and Ground Distribution
- Wiring Harness
- Application and ID
- Description and Operation
- Service and Repair
- Specifications
- Technical Service Bulletins
- Steering and Suspension
- Alignment
- Relays and Modules - Steering and Suspension
- Sensors and Switches - Steering and Suspension
- Steering
- Front Steering Knuckle
- Power Steering
- Sensors and Switches - Steering
- Steering Angle Sensor
- Steering Column
- Steering Gear
- Steering Wheel
- Tie Rod
- Technical Service Bulletins
- Tools and Equipment
- Suspension
- Ball Joint
- Control Arm
- Cross-Member
- Front Steering Knuckle
- Sensors and Switches - Suspension
- Stabilizer Bar
- Suspension Control ( Automatic - Electronic )
- Suspension Spring ( Coil / Leaf )
- Suspension Strut / Shock Absorber
- Trailing Arm
- Wheel Bearing
- Wheel Hub
- Testing and Inspection
- Service and Repair
- Tools and Equipment
- Wheels and Tires
- Service Precautions
- Testing and Inspection
- Service and Repair
- Technical Service Bulletins
- Tools and Equipment
- Heating and Air Conditioning
- Air Door
- Auxiliary Water Pump
- Blower Motor
- Blower Motor Switch
- Cabin Air Filter / Purifier
- Compressor HVAC
- Condenser HVAC
- Condenser Fan
- Control Assembly
- Evaporator Core
- Evaporator Drain Tube
- Evaporator Temperature Sensor / Switch
- Expansion Valve
- Heater Control Valve
- Heater Core
- Receiver Dryer
- Refrigerant
- Refrigerant Oil
- Refrigerant Pressure Sensor / Switch
- Sensors and Switches - HVAC
- Solar Sensor
- Service Precautions
- Description and Operation
- Testing and Inspection
- Service and Repair
- Specifications
- Technical Service Bulletins
- Tools and Equipment
- Adapter
- Adapter Lead
- Clamping Pliers
- Fixture
- Holder
- Installation Drift
- Installation Sleeve
- Leak Detectors
- Pin Wrench
- Precision Spring Balance
- Puller - I
- Puller - II
- Puller - III
- Puller - IV
- Recommended Refrigerant Equipment
- Release and Installation Aid
- Release Hook
- Set of Sealing Adapters
- Special Pliers
- Spray Unit
- Spray Unit - I
- Spray Unit - II
- Spray Unit - III
- Temperature Sensing Equipment
- Test Lead
- V-Adapter Lead, 2-Pin
- Restraints and Safety Systems
- Repairs and Inspections Required After a Collision
- Air Bag Systems
- Relays and Modules - Restraints and Safety Systems
- Seat Belt Systems
- Sensors and Switches - Restraints and Safety Systems
- Service Precautions
- Description and Operation
- Testing and Inspection
- Service and Repair
- Specifications
- Technical Service Bulletins
- Tools and Equipment
- Accessories and Optional Equipment
- Antenna
- Antitheft and Alarm Systems
- Cellular Phone
- Central Control Module
- Collision Avoidance and Parking Assist Systems
- Driver/Vehicle Information Display
- Entertainment Systems
- Garage Door Opener Transmitter
- Global Positioning System
- Global Positioning System Module
- Description and Operation
- Service and Repair
- Replacing Antenna For Global Positioning System (Gps)
- Removing/Replacing Navigation Computer With CD-Drive
- Removing/Replacing Antenna of Global Positioning System (Gps)
- Removing and Installing Magnetic Field Sensor
- Replacing Receiver Module (Gps) (Touring)
- Replacing Antenna of Global Positioning System (Gps) (Touring)
- Technical Service Bulletins
- Memory Positioning Systems
- Navigation System
- Night Vision System
- Radio, Stereo, and Compact Disc
- Relays and Modules - Accessories and Optional Equipment
- Sensors and Switches - Accessories and Optional Equipment
- Trip Computer
- Technical Service Bulletins
- Body and Frame
- Air Bag(s) Arming and Disarming
- Repairs and Inspections Required After a Collision
- Bumper
- Cowl
- Doors, Hood and Trunk
- Exterior Moulding / Trim
- Fender
- Frame
- Grille
- Interior Moulding / Trim
- Carpet
- Console
- Dashboard / Instrument Panel
- Air Bag(s) Arming and Disarming
- Service and Repair
- 51 45 030 Removing And Installing Trim For Instrument Panel (Lower Section)
- 51 45 031 Replacing Trim For Instrument Panel (lower section)
- 51 45 050 Removing And Installing Trim For Upper Section Of Instrument Panel
- 51 45 051 Replacing Trim For Upper Section Of Instrument Panel
- 51 45 130 Removing And Installing/Replacing Speaker Cover On Left
- 51 45 135 Removing And Installing/Replacing Speaker Cover On Right
- 51 45 185 Removing And Installing/Replacing Trim For Pedal Assembly
- 51 45 265 Replacing Instrument Cluster Trim Panel
- 51 45... Removing And Installing Trim Panel For Speaker On Left
- 51 45... Removing And Installing/Replacing Left Knee Protection
- Technical Service Bulletins
- Glove Compartment
- Headliner
- Scuff Plate
- Sun Visor
- Trim Panel
- Utility Storage Compartment
- Locks
- Mirrors
- Paint, Striping and Decals
- Relays and Modules - Body and Frame
- Roll Bar
- Roof and Associated Components
- Convertible Top
- Convertible Top Canvas
- Convertible Top Deck Lid Components
- Convertible Top Hydraulic Control Unit
- Convertible Top Hydraulic Cylinder
- Convertible Top Hydraulic Fluid
- Convertible Top Hydraulic Hose
- Convertible Top Latch
- Convertible Top Switch
- Testing and Inspection
- Adjustments
- Locations
- Service and Repair
- Specifications
- Technical Service Bulletins
- Hard Top
- Sunroof / Moonroof
- Technical Service Bulletins
- Convertible Top
- Seats
- Memory Positioning Systems
- Power Seat Motor
- Power Seat Switch
- Seat Temperature Switch
- Service and Repair
- Additional Work In Event of Faulty Longitudinal Adjustment Drive
- Removing and Installing/Replacing Gearing For Longitudinal Seat Adjustment on Left and Right on Front Seat
- Removing and Installing Left or Right Front Seat
- Removing and Installing/Replacing Outer Cover on Left or Right Front Door
- Removing and Installing or Replacing Front Left or Right Headrest
- Removing and Installing/Replacing Rear Panel on Left or Right Front Seat Backrest
- Specifications
- Technical Service Bulletins
- Sensors and Switches - Body and Frame
- Sound Proofing / Insulation
- Spoilers, Flaps, and Air Dams
- Unibody
- Weatherstrip
- Service Precautions
- Description and Operation
- Specifications
- 51 11 Front Bumper
- 51 12 Rear Bumper
- 51 16 Mirrors, Finishers, Ashtrays, Consoles
- 51 23 Hood/Bonnet Locks
- 51 71 Seals and Loose Body Parts
- 52 10 Front Seat
- 54 21 Hard Top
- 54 31 Convertible Top, Frame and Actuation (Mechanical Components)
- 54 34 Motor-Driven Convertible Top (Hydraulic Components)
- 54 61 Rollover Protection System, Fixed
- 72 11 Seat Belts
- Technical Service Bulletins
- Cruise Control
- Instrument Panel, Gauges and Warning Indicators
- Air Bag Deactivation Indicator
- Clock
- Dashboard / Instrument Panel
- Air Bag(s) Arming and Disarming
- Service and Repair
- 51 45 030 Removing And Installing Trim For Instrument Panel (Lower Section)
- 51 45 031 Replacing Trim For Instrument Panel (lower section)
- 51 45 050 Removing And Installing Trim For Upper Section Of Instrument Panel
- 51 45 051 Replacing Trim For Upper Section Of Instrument Panel
- 51 45 130 Removing And Installing/Replacing Speaker Cover On Left
- 51 45 135 Removing And Installing/Replacing Speaker Cover On Right
- 51 45 185 Removing And Installing/Replacing Trim For Pedal Assembly
- 51 45 265 Replacing Instrument Cluster Trim Panel
- 51 45... Removing And Installing Trim Panel For Speaker On Left
- 51 45... Removing And Installing/Replacing Left Knee Protection
- Technical Service Bulletins
- Driver/Vehicle Information Display
- Fuel Gauge
- Instrument Cluster / Carrier
- Low Tire Pressure Indicator
- Maintenance Required Lamp/Indicator
- Odometer
- Oil Level Warning Indicator
- Oil Pressure Sender
- Outside Temperature Display
- Relays and Modules - Instrument Panel
- Sensors and Switches - Instrument Panel
- Speedometer Head
- Speedometer Module
- Temperature Gauge
- Tire Monitoring System
- Service and Repair
- Specifications
- Technical Service Bulletins
- Lighting and Horns
- Ambient Light Sensor
- Backup Lamp
- Brake Lamp
- Brake Light Switch
- Center Mounted Brake Lamp
- Courtesy Lamp
- Dome Lamp
- Fog/Driving Lamp
- Hazard Warning Lamps
- Headlamp
- Horn
- License Plate Lamp
- Marker Lamp
- Parking Lamp
- Rain / Fog Sensor
- Relays and Modules - Lighting and Horns
- Sensors and Switches - Lighting and Horns
- Tail Lamp
- Trunk Lamp
- Turn Signals
- Combination Switch
- Turn Signal Switch
- Service and Repair
- Removing and Installing Front Left or Right Turn Signal Flasher
- Removing /Installing Front Auxiliary Turn Indicator Light
- Removing Light Module For Left Additional Turn Signal Lamp
- Removing Light Module For Right Additional Turn Signal Lamp
- Replacing Reflector Left Auxiliary Turn Indicator Light
- Replacing Reflector Right Auxiliary Turn Indicator Light
- Specifications
- Underhood Lamp
- Vanity Lamp
- Service Precautions
- Testing and Inspection
- Adjustments
- Service and Repair
- Specifications
- Technical Service Bulletins
- Tools and Equipment
- Windows and Glass
- Wiper and Washer Systems
- Application and ID
Diagrams- Specifications
- Electrical Specifications
- Mechanical Specifications
- Accelerator Pedal
- Alignment
- Axle Nut
- Backup Lamp
- Body and Frame
- System Specifications
- 51 11 Front Bumper
- 51 12 Rear Bumper
- 51 16 Mirrors, Finishers, Ashtrays, Consoles
- 51 23 Hood/Bonnet Locks
- 51 71 Seals and Loose Body Parts
- 52 10 Front Seat
- 54 21 Hard Top
- 54 31 Convertible Top, Frame and Actuation (Mechanical Components)
- 54 34 Motor-Driven Convertible Top (Hydraulic Components)
- 54 61 Rollover Protection System, Fixed
- 72 11 Seat Belts
- Convertible Top
- Front Bumper
- Front Door
- Hard Top
- Hood
- Mirrors
- Rear Bumper
- Roll Bar
- Seats
- Weatherstrip
- System Specifications
- Brakes and Traction Control
- System Specifications
- Brake Caliper
- Brake Fluid Pressure Sensor/Switch
- Brake Fluid Pump
- Brake Hose/Line
- Brake Master Cylinder
- Brake Pad
- Brake Pedal Assy
- Brake Rotor/Disc
- Electronic Brake Control Module
- Hydraulic Assembly, Traction Control
- Parking Brake Lever
- Vacuum Brake Booster
- Wheel Speed Sensor
- Yaw Rate Sensor
- Control Arm
- Cooling System
- Distributor, Ignition
- Engine
- System Specifications
- Camshaft, Lifters and Push Rods
- Cylinder Block Assembly
- Cylinder Head Assembly
- Cylinder Head Gasket
- Intake Manifold
- Oil Pump, Engine
- Timing Components
- Engine Control Module
- Exhaust System
- Firing Order
- Fuel Filter
- Fuel Injector
- Fuel Pump
- Fuel Tank
- Heating and Air Conditioning
- Idle Speed
- Ignition Coil
- Instrument Panel, Gauges and Warning Indicators
- Radio, Stereo, and Compact Disc
- Restraints and Safety Systems
- Spark Plug
- Starting and Charging
- Suspension Strut / Shock Absorber
- Throttle Body
- Trailing Arm
- Transmission and Drivetrain
- Wheel Bearing
- Wheel Stud / Lug Nut
- Wiper and Washer Systems
- Pressure, Vacuum and Temperature Specifications
- Capacity Specifications
- Fluid Type Specifications
- Technical Service Bulletins
- Tools and Equipment
- Engine Electrical Tools and Equipment
- Engine Speed Booster
- Repair Kit
- Removal Fork
- Lever
- Retaining Fixture
- Spark Plug Spanner Waf 17.5 mm
- Spark Plug Tool
- Pliers
- Torque Limiter 30 NM
- Adapter Set For 134-Pin Module Plug
- Multi-Channel Adapter (Mca)
- TDC Sensor
- Ignition Retard Simulator
- Socket Wrench Socket Waf 12
- Ring Spanner (Brace)
- Adjustment Pins
- Switching Unit
- Mixture Monitor (Integrator)
- Adapter Lead and Switching Unit
- Test Kit For EML
- Adapter - I
- Adapter - II
- Set of Adapters
- Adapter Lead
- Gauge For Pedal Position Sensor
- Socket Wrench Socket Waf 24
- 3/8" Extension Piece (2)
- EPROM Tools / ID Marking
- Set of Tools
- Control Unit Seal
- V-Adapter Lead, 40-Pin
- V-Adapter Lead, 81-Pin
- V-Adapter Lead, 9-Pin
- V-Adapter Lead, 10-Pin
- V-Adapter Lead, 23-Pin
- V-Adapter Lead, 4-Pin
- Test Adapter, 56-Pin
- Plug Adapter For Cng Wiring Harness
- Special Tools
- Multi Meter
- Car Electrical System Senders
- Service Interval Resetter (SIR)
- 20/15-Pin Adapter
- Set of Test Leads
- Adapter Lead
- Diagnosis Connector - Airbag
- Airbag Test Cable
- Airbag Reset
- Adapter
- Adapter Lead Zae/Mrs 3 (50-Pin)
- Releasing Tool Kit
- Extractor
- Removal Tool - I
- Adapter Lead - I
- Setting Cone
- Spanner
- Pliers - I
- V-Adapter Lead, 30-Pin
- V-Adapter Lead, 24-Pin
- Pliers - II
- Pin Wrench
- Assembly Gauge - I
- Assembly Gauge - II
- Set of Assembly Tools
- Releasing Tool - I
- Set of DIS Test Prods
- Test Cable For K-Jetronic
- Peripheral Box 26-Pin and Cables (8)
- Set of V-Adapter Leads (8 Leads)
- Set of Leads (6)
- Set of V-Adapter Leads (7 Leads)
- Set of V-Adapter Leads (2 Leads)
- Ignition Lead Adapter
- Bypass Connector
- Adapter - I
- V-Adapter Lead - I
- 2-Pin V-Adapter Lead (Jpt), Black
- Adapter - II
- Set of Cables For Electrical Seat Adjustment
- Adapter Lead - II
- Puller
- Adapter For Measuring Closed-Circuit Current - I
- Adapter For Measuring Closed-Circuit Current - II
- Battery Trickle Charger
- Tester and Set of Plug Adapters (8)
- V-Adapter Lead - II
- Bypass Switch
- Releasing Tool - II
- V-Adapter Lead, 54-Pin - I
- V-Adapter Lead, 54-Pin - II
- Test Leads For Ews 3
- V-Adapter Lad, 5-Pin
- V-Adapter Lead, 8-Pin - I
- V-Adapter Lead, 8-Pin - II
- Removal Tool - II
- Adapter Lead For OBD Socket
- V-Adapter Lead
- Measuring Box, 105-Pin, Complete
- Measuring Box, 60-Pin
- Set of Test Adapters, 88-Pin
- Set of Test Adapters, 83-Pin
- Set of Test Lead Extensions
- Terminal Box For Microswitch
- 20-Pin V-Adapter Lead (D 2.5), Black
- Set of 26-Pin V-Adapter Leads (Elo), Zero-Coded
- 18-Pin V-Adapter Lead (Elo), Zero-Coded
- 12-Pin V-Adapter Lead (Elo), Zero-Coded
- 20-Pin V-Adapter Lead (D 2.5), White
- 5-Pin V-Adapter Lead (D 2.5), Black
- Torx Socket T80 With Holder
- Set of V-Adapter Leads (6 Leads)
- Set of V-Adapter Leads (5 Leads) - I
- Set of V-Adapter Leads (5 Leads) - II
- V-Pin Adapter Lead, 6-Pin, Oval
- Universal Wiper Arm Puller
- Supplementary Kit D 1.5-D 2.5/Ela
- Elo Supplementary Kit
- Elo/Ela Supplementary Kit
- Setting Wrench
- Open Ring Wrench 13 A/F
- Additions to Repair Kit I
- Additions to Repair Kit II
- Additions to Repair Kit III
- Handbook
- Repair Kit IV For Vehicle Electrical System
- Drawer Bag Not Including Content
- Set of Tools For Repair Kit IV
- Repair Kits A - N
- Repair Kit
- Supplementary Kit (Engine Electrical System)
- Supplementary Kit (Body Electrical System)
- Repair Kit 0
- Repair Kit P
- Repair Kit Q
- Special Tools For Wiring Harness Repairs
- Engine Electrical Tools and Equipment
Diagnostic Trouble Codes