Repair and Diagnosis
- A L L Diagnostic Trouble Codes ( DTC )
- Relays and Modules
- Relays and Modules - Body and Frame
- Relays and Modules - Cruise Control
- Relays and Modules - Engine
- Relays and Modules - Instrument Panel
- Relays and Modules - Lighting and Horns
- Relays and Modules - Powertrain Management
- Relays and Modules - Starting and Charging
- Relays and Modules - Windows and Glass
- Relays and Modules - Wiper and Washer Systems
- 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 - Computers and Control Systems
- Absolute Pressure Sensor
- Air Flow Meter/Sensor
- Barometric Pressure Sensor
- Barometric Pressure Switch
- Camshaft Position Sensor
- Coolant Temperature Sensor/Switch (For Computer)
- Crankshaft Position Sensor
- EGR Valve Position Sensor
- Air Temperature Sensor ( Ambient / Intake )
- Knock Sensor
- Manifold Pressure/Vacuum Sensor
- Oxygen Sensor
- Throttle Full Close Switch
- Throttle Position Sensor
- Vehicle Speed Sensor
- Sensors and Switches - Emission Control Systems
- Sensors and Switches - Fuel Delivery and Air Induction
- Sensors and Switches - Ignition System
- Sensors and Switches - Computers and Control Systems
- Sensors and Switches - Starting and Charging
- Sensors and Switches - Windows and Glass
- Sensors and Switches - Wiper and Washer Systems
- Maintenance
- Alignment
- Tune-up and Engine Performance Checks
- Fuel Pressure
- Idle Speed
- Fuel Filter
- Firing Order
- Ignition Timing
- Ignition Cable
- Distributor
- Spark Plug
- Valve Clearance
- Service Precautions
- Technical Service Bulletins
- Drive Belt
- Filters
- Hoses
- Fluids
- Brake Bleeding
- Fuses and Circuit Breakers
- Service Reminder Indicators
- Wheels and Tires
- Service Intervals
- Severe Service Defined
- Routine Service
- Normal Service
- 7500 MI or 12000 KM
- 15000 MI or 24000 KM
- 22500 MI or 36000 KM
- 30000 MI or 48000 KM
- 37500 MI or 60000 KM
- 45000 MI or 72000 KM
- 52500 MI or 84000 KM
- 60000 MI or 96000 KM
- 67500 MI or 108000 KM
- 75000 MI or 120000 KM
- 82500 MI or 132000 KM
- 90000 MI or 144000 KM
- 97500 MI or 156000 KM
- 105000 MI or 168000 KM
- 112500 MI or 180000 KM
- 120000 MI or 192000 KM
- Severe Service
- 3000 MI or 4800 KM
- 6000 MI or 9600 KM
- 9000 MI or 14400 KM
- 12000 MI or 19200 KM
- 15000 MI or 24000 KM
- 18000 MI or 28800 KM
- 21000 MI or 33600 KM
- 24000 MI or 38400 KM
- 27000 MI or 43200 KM
- 30000 MI or 48000 KM
- 33000 MI or 52800 KM
- 36000 MI or 57600 KM
- 39000 MI or 62400 KM
- 42000 MI or 67200 KM
- 45000 MI or 72000 KM
- 48000 MI or 76800 KM
- 51000 MI or 81600 KM
- 54000 MI or 86400 KM
- 57000 MI or 91200 KM
- 60000 MI or 96000 KM
- 63000 MI or 100800 KM
- 66000 MI or 105600 KM
- 69000 MI or 110400 KM
- 72000 MI or 115200 KM
- 75000 MI or 120000 KM
- 78000 MI or 124800 KM
- 81000 MI or 129600 KM
- 84000 MI or 134400 KM
- 87000 MI or 139200 KM
- 90000 MI or 144000 KM
- 93000 MI or 148800 KM
- 96000 MI or 153600 KM
- 99000 MI or 158400 KM
- 102000 MI or 163200 KM
- 105000 MI or 168000 KM
- 108000 MI or 172800 KM
- 111000 MI or 177600 KM
- 114000 MI or 182400 KM
- 117000 MI or 187200 KM
- 120000 MI or 192000 KM
- Service and Repair
- Technical Service Bulletins
- Engine, Cooling and Exhaust
- Engine
- 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
- Fuel Pressure
- Idle Speed
- Fuel Filter
- Firing Order
- Ignition Timing
- Ignition Cable
- Distributor
- Spark Plug
- Valve Clearance
- Service Precautions
- Technical Service Bulletins
- Water Pump
- Application and ID
- Service and Repair
- Specifications
- Technical Service Bulletins
- Cooling System
- Coolant
- Coolant Level Sensor
- Coolant Reservoir
- Radiator Cooling Fan
- Engine - Coolant Temperature Sensor/Switch
- Heater Core
- Heater Hose
- Lamps and Indicators - Cooling System
- Sensors and Switches - Cooling System
- Temperature Gauge
- Temperature Warning Lamp/Indicator
- Thermostat
- Water Pump
- Specifications
- Technical Service Bulletins
- Exhaust System
- Engine
- Powertrain Management
- Relays and Modules - Powertrain Management
- Sensors and Switches - Powertrain Management
- Sensors and Switches - Computers and Control Systems
- Absolute Pressure Sensor
- Air Flow Meter/Sensor
- Barometric Pressure Sensor
- Barometric Pressure Switch
- Camshaft Position Sensor
- Coolant Temperature Sensor/Switch (For Computer)
- Crankshaft Position Sensor
- EGR Valve Position Sensor
- Air Temperature Sensor ( Ambient / Intake )
- Knock Sensor
- Manifold Pressure/Vacuum Sensor
- Oxygen Sensor
- Throttle Full Close Switch
- Throttle Position Sensor
- Vehicle Speed Sensor
- Sensors and Switches - Emission Control Systems
- Sensors and Switches - Fuel Delivery and Air Induction
- Sensors and Switches - Ignition System
- Sensors and Switches - Computers and Control Systems
- Tune-up and Engine Performance Checks
- Fuel Pressure
- Idle Speed
- Fuel Filter
- Firing Order
- Ignition Timing
- Ignition Cable
- Distributor
- Spark Plug
- Valve Clearance
- Service Precautions
- Technical Service Bulletins
- Computers and Control Systems
- Absolute Pressure Sensor
- Air Flow Meter/Sensor
- Air Temperature Sensor ( Ambient / Intake )
- Barometric Pressure Sensor
- Barometric Pressure Switch
- Camshaft Position Sensor
- Coolant Temperature Sensor/Switch (For Computer)
- Crankshaft Position Sensor
- EGR Valve Position Sensor
- Engine Control Module
- Feedback Control Solenoid
- Idle Speed/Throttle Actuator - Mechanical
- Idle Up Control Valve
- Knock Sensor
- Main Relay (Computer/Fuel System)
- Malfunction Indicator Lamp
- Manifold Pressure/Vacuum Sensor
- Oxygen Sensor
- Relays and Modules - Computers and Control Systems
- Sensors and Switches - Computers and Control Systems
- Absolute Pressure Sensor
- Air Flow Meter/Sensor
- Barometric Pressure Sensor
- Barometric Pressure Switch
- Camshaft Position Sensor
- Coolant Temperature Sensor/Switch (For Computer)
- Crankshaft Position Sensor
- EGR Valve Position Sensor
- Air Temperature Sensor ( Ambient / Intake )
- Knock Sensor
- Manifold Pressure/Vacuum Sensor
- Oxygen Sensor
- Throttle Full Close Switch
- Throttle Position Sensor
- Vehicle Speed Sensor
- Throttle Full Close Switch
- Throttle Position Sensor
- Vehicle Speed Sensor
- Description and Operation
- Testing and Inspection
- Initial Inspection and Diagnostic Overview
- Reading and Clearing Diagnostic Trouble Codes
- Reading Diagnostic Trouble Codes
- Quick Test Appendix (Detailed Testing Instructions)
- Quick Tests
- 1.0 - Visual Check & Vehicle Preparation
- 2.0 - Equipment Hook-Up
- 3.0 - Key On Engine Off Self Test
- 3.1 - Key On Engine Off Self Test
- 3.1 (Codes), 4.0 - Key-On, Engine-Off Self-Test
- 5.0 - Engine Running Self-Test
- 5.1 - Engine Running Self-Test
- 6.0, 6.1 and 6.2 - Continuous Test
- 6.3 - Continuous Monitor Mode (Wiggle Test) (Codes)
- 7.0 - Diagnosis By Symptom
- Clearing Diagnostic Trouble Codes
- Reading Diagnostic Trouble Codes
- Diagnostic Trouble Code Tests and Associated Procedures
- Pinpoint Tests
- A - No Start Test
- B - Vehicle Battery
- C - Reference Voltage
- DA - Vane Air Temperature Sensor (VAT)
- DB - Air Charge Temperature Sensor (ACT)
- DC - Barometric Pressure Sensor (BP)
- DD - EGR Valve Position Sensor (EVP)
- DE - Engine Coolant Temperature Sensor (ECT)
- DF - Manifold Absolute Pressure (MAP)/Barometric Pressure (BP)
- DG - Knock Sensor
- DH - Throttle Position (TP) Sensor
- DK - Vane Air Flow Sensor (VAF)
- DL - EGR Valve Position
- FA - Neutral Drive Switch A/C Input
- FB - Idle Tracking Switch
- FC - Vehicle (Key) Power
- HA - Fuel Control (EFI)
- HB - Fuel Control (FBC)
- HC - Fuel Control
- J - Fuel Pump Circuit
- KA - EGR On/Off Control
- KC - Air Management System
- KD - Canister Purge (CANP) Solenoid
- KE - Idle Speed Control
- KF - Idle Speed Control (DC Motor Control)
- KG - Idle Speed Control Throttle Kicker
- KJ - Variable Voltage Choke
- KK - Temperature Compensated Pump
- KL - Shift Indicator Light (SIL)
- KM - WOT A/C Cut-Off (WAC) A/C Demand
- KN - Turbo Boost
- KP - Exhaust Heat Control
- KR - WOT A/C Cutoff (WAC)
- KS - Air Management System
- KT - Idle Speed Control (Throttle Kicker)
- M - Dynamic Response Test
- N - Ignition Diagnostic Monitor (IDM)
- P - Spark Timing Check
- Q - No Codes/Codes Not Listed
- UA - Output Circuit Check (Thermactor) 1984
- UC - Output Circuit Check (EGRV/EGRC) 1984
- UE - Output Circuit Check (Canister Purge) 1984
- UG - Output Circuit Check - Temp. Compensated Fuel Pump
- UH - Output Circuit Check - Variable Voltage Choke (VVC) 1984
- UJ - Output Circuit Check - WOT A/C Cut-Off 1984
- UK-Output Circuit Check - Idle Speed Control (Throttle Kicker)
- UL - Output Circuit Check - Exhaust Heat Control 1984
- Y - Erratic Ignition
- Locations
- Diagrams
- Technical Service Bulletins
- Tools and Equipment
- Emission Control Systems
- Air Injection
- Air Injection Vacuum Control Solenoid Valve
- Air Diverter Solenoid
- Air Diverter Valve
- Air Injection Bypass Valve
- Air Injection Check Valve
- Air Injection Control Valve
- Air Injection Filter
- Air Injection Hose/Tube
- Air Injection Manifold
- Air Injection Pump
- Air Injection Pump Relay
- Air Injection Relief Valve
- Pulsed Secondary Air Injection
- Thermal Vacuum Valve
- Testing and Inspection
- Diagrams
- Technical Service Bulletins
- Catalytic Converter
- Early Fuel Evaporation ( EFE )
- Evaporative Emissions System
- Exhaust Gas Recirculation
- Positive Crankcase Ventilation
- Relays and Modules - Emission Control Systems
- Sensors and Switches - Emission Control Systems
- Thermostatic Air Cleaner
- Vacuum Restrictor
- Application and ID
- Description and Operation
- Testing and Inspection
- Locations
- Diagrams
- Diagram Information and Instructions
- Electrical Diagrams
- Vacuum and Vapor Hose Diagrams
- EEC-IV Vacuum Hose Routing
- Fig. 37 Calib. Code 3-22D-R00 Calif.
- Fig. 38 Calib. Code 4-21A-R02 Federal
- Fig. 39 Calib. Code 4-21A-R15 Federal
- Fig. 40 Calib. Code 4-21P-R12 Calif.
- Fig. 41 Calib. Code 4-22A-R13 Calif.
- Fig. 42 Calib. Code 4-22B-R00 Exc. Calif.
- Fig. 43 Calib. Code 4-22C-R00 Exc. Calif.
- Fig. 44 Calib. Code 4-22D-R00 Exc. Calif.
- Fig. 45 Calib. Code 4-22D-R10 Exc. Calif.
- Fig. 46 Calib. Code 4-22F-R00 Exc. Calif.
- Fig. 47 Calib. Code 4-22F-R10 Calif.
- Fig. 48 Calib. Code 4-22Q-R00 Exc. Calif.
- Fig. 49 Calib. Code 4-22Q-R00 Calif.
- Technical Service Bulletins
- Air Injection
- Fuel Delivery and Air Induction
- Fuel Pressure
- Fuel Pressure Release
- Idle Speed
- Air Flow Meter/Sensor
- Carburetor
- Fuel
- Fuel Filter
- Fuel Flow Sensor
- Fuel Hose Clamp
- Fuel Injector
- Fuel Pump
- Fuel Return Line
- Fuel Supply Line
- Fuel Tank
- Idle Speed/Throttle Actuator - Mechanical
- Idle Up Control Valve
- Idle/Altitude Compensator (Non Comp. Controlled)
- Inertia Fuel Shutoff Switch
- Intake Air Heater
- Main Relay (Computer/Fuel System)
- Relays and Modules - Fuel Delivery and Air Induction
- Sensors and Switches - Fuel Delivery and Air Induction
- Throttle Body
- Throttle Full Close Switch
- Throttle Position Sensor
- Service Precautions
- Application and ID
- Description and Operation
- Service and Repair
- Diagrams
- Technical Service Bulletins
- Ignition System
- Firing Order
- Ignition Timing
- Ignition Ballast Resistor
- Camshaft Position Sensor
- Ignition Coil Wire
- Crankshaft Position Sensor
- Distributor
- Hall Effect Sensor
- Ignition Cable
- Ignition Coil
- Ignition Control Module
- Ignition Timing Connector
- Knock Sensor
- Pick-Up Coil
- Relays and Modules - Ignition System
- Sensors and Switches - Ignition System
- Spark Plug
- Vacuum Restrictor
- Service Precautions
- Description and Operation
- Testing and Inspection
- Flow of Diagnosis
- Component Tests and General Diagnostics
- Intermittent Diagnostic Procedures
- Primary Circuit Tests
- DS II
- Test 1, Start Circuit
- Test 2, Run Circuit
- Test 3, Module Voltage
- Test 4, Ballast Resistor
- Test 5, Supply Voltage Circuit
- Test 6, Ignition Coil Supply Voltage
- Test 7, Distributor Stator Assembly & Wiring Harness
- Test 8, Ignition Module to Stator Assembly Wiring Harness
- Test 9, Ignition Coil Secondary Resistance
- Test 10, Module to Coil Wire
- Test 11, Distributor Stator Assembly
- Test 12, Ignition Coil Primary Resistance
- Test 13, Primary Circuit
- Test 14, Ground Circuit
- Test 15, Distributor Ground Circuit
- TFI IV
- Test 1, Ignition Coil Secondary Voltage (Crank Mode)
- Test 2, Ignition Coil Secondary Voltage (Run Mode)
- Test 3, Wiring Harness
- Test 4 & 5, Stator
- Test 6, TFI Module
- Test 7, Ignition Coil Primary Resistance
- Test 8, Ignition Coil Secondary Resistance
- Test 9, EEC-IV -- TFI-IV
- Test 10, Ignition Coil Supply Voltage
- Test 11, Wiring Harness
- DS II
- Secondary Circuit Tests
- Diagrams
- Specifications
- Technical Service Bulletins
- Tools and Equipment
- Transmission Control Systems
- Application and ID
- Diagrams
- Technical Service Bulletins
- Transmission and Drivetrain
- Automatic Transmission/Transaxle
- Clutch
- Differential Assembly
- Drive Axles, Bearings and Joints
- Drive/Propeller Shafts, Bearings and Joints
- Flywheel
- Manual Transmission/Transaxle
- Transmission Control Systems
- Technical Service Bulletins
- Tools and Equipment
- Brakes and Traction Control
- Starting and Charging
- Sensors and Switches - Starting and Charging
- Relays and Modules - Starting and Charging
- Battery
- Charging System
- Starting System
- Power and Ground Distribution
- Technical Service Bulletins
- Power and Ground Distribution
- Steering and Suspension
- Heating and Air Conditioning
- Accumulator HVAC
- Air Door
- Air Duct
- Blower Motor
- Blower Motor Resistor
- Blower Motor Switch
- Cabin Temperature Sensor / Switch
- Compressor HVAC
- Condenser HVAC
- Control Assembly
- Coolant Temperature Sensor / Switch HVAC
- Coupler HVAC
- Evaporator Case
- Evaporator Core
- Expansion Valve
- Heater Core
- Heater Core Case
- Heater Hose
- Hose/Line HVAC
- Receiver Dryer
- Refrigerant
- Refrigerant Oil
- Refrigerant Pressure Sensor / Switch
- Sensors and Switches - HVAC
- Service Port HVAC
- Vacuum Controller
- Vacuum Reservoir HVAC
- Vacuum Solenoid Valve HVAC
- Service Precautions
- Description and Operation
- Testing and Inspection
- Flow of Diagnosis
- Initial Inspection and Diagnostic Overview
- Symptom Related Diagnostic Procedures
- Electronic Climate Control
- Air Comes Out Defroster Outlet In Any Selector Lever Position
- Air Flow Changes Direction When Vehicle Is Accelerated
- All Function Selector Valve Positions Leak
- Blower Does Not Operate
- Hissing ATC Vacuum System or Control Assembly Selector Valve
- Insufficient, Erratic, Or No Heat Or Defrost
- Some Temperature Control Lever Positions Leak
- Too Much Heat
- Manual Climate Control
- Electronic Climate Control
- Component Tests and General Diagnostics
- Service and Repair
- Diagrams
- Technical Service Bulletins
- Tools and Equipment
- Restraints and Safety Systems
- Accessories and Optional Equipment
- Antenna
- Antitheft and Alarm Systems
- Driver/Vehicle Information Display
- Radio, Stereo, and Compact Disc
- Sensors and Switches - Accessories and Optional Equipment
- Towing / Trailer System
- Trailer Connector
- Trip Computer
- Diagrams
- Technical Service Bulletins
- Body and Frame
- Bumper
- Doors, Hood and Trunk
- Interior Moulding / Trim
- Locks
- Paint, Striping and Decals
- Relays and Modules - Body and Frame
- Seats
- Sensors and Switches - Body and Frame
- Weatherstrip
- Technical Service Bulletins
- Cruise Control
- Brake Switch (Cruise Control)
- Clutch Switch
- Cruise Control Module
- Cruise Control Servo
- Cruise Control Servo Cable
- Cruise Control Switch
- Cruise Control Vacuum Vent Solenoid
- Relays and Modules - Cruise Control
- Sensors and Switches - Cruise Control
- Vacuum Vent Valve
- Vehicle Speed Sensor/Transducer - Cruise Control
- Description and Operation
- Testing and Inspection
- Diagrams
- Technical Service Bulletins
- Instrument Panel, Gauges and Warning Indicators
- Ammeter Gauge
- Audible Warning Device
- Charge Lamp/Indicator
- Cigarette Lighter
- Clock
- Driver/Vehicle Information Display
- Fuel Distance/Mileage Module
- Fuel Gauge
- Fuel Gauge Sender
- Instrument Cluster / Carrier
- Key Reminder Switch
- Low Fuel Lamp/Indicator
- Malfunction Indicator Lamp
- Odometer
- Oil Level Warning Indicator
- Oil Level Warning Indicator Relay
- Oil Pressure Gauge
- Oil Pressure Sender
- Oil Pressure Warning Lamp/Indicator
- Parking Brake Warning Switch
- Relays and Modules - Instrument Panel
- Sensors and Switches - Instrument Panel
- Speedometer Cable
- Speedometer Head
- Temperature Gauge
- Temperature Sensor (Gauge)
- Temperature Warning Lamp/Indicator
- Vacuum Gauge/Economy Meter
- Volt Meter Gauge
- Testing and Inspection
- Diagrams
- Technical Service Bulletins
- Lighting and Horns
- Ambient Light Sensor
- Backup Lamp
- Brake Lamp
- Brake Light Switch
- Cornering Lamp
- Courtesy Lamp
- Hazard Warning Lamps
- Headlamp
- Horn
- Marker Lamp
- Parking Lamp
- Relays and Modules - Lighting and Horns
- Sensors and Switches - Lighting and Horns
- Trailer Lighting Relay
- Turn Signals
- Application and ID
- Diagrams
- Technical Service Bulletins
- Windows and Glass
- Wiper and Washer Systems
- Relays and Modules - Wiper and Washer Systems
- Sensors and Switches - Wiper and Washer Systems
- Washer Fluid Level Switch
- Windshield Washer Motor
- Windshield Washer Pump
- Windshield Washer Relay
- Windshield Washer Switch
- Wiper Blade
- Wiper Control Module
- Wiper Gear Box
- Wiper Motor
- Wiper Motor Timer
- Wiper Relay
- Wiper Switch
- Description and Operation
- Testing and Inspection
- Locations
- Diagrams
- Technical Service Bulletins
- Application and ID
- Locations
- Diagrams
- Diagram Information and Instructions
- Connector Views
- Electrical Diagrams
- Power and Ground Distribution
- Accessories and Optional Equipment
- Charging System
- Cruise Control
- Fuel Door
- Heated Glass Element
- Heating and Air Conditioning
- Instrument Panel, Gauges and Warning Indicators
- Lighting and Horns
- Power Locks
- Power Window Circuit Breaker
- Power Window Motor
- Power Window Relay
- Power Window Switch
- Powertrain Management
- Seats
- Starting System
- Trunk / Liftgate
- Wiper and Washer Systems
- Vacuum and Vapor Hose Diagrams
- Brakes and Traction Control
- Cruise Control
- Heating and Air Conditioning
- Powertrain Management
- System Diagram
- Emission Control Systems
- EEC-IV Vacuum Hose Routing
- Fig. 37 Calib. Code 3-22D-R00 Calif.
- Fig. 38 Calib. Code 4-21A-R02 Federal
- Fig. 39 Calib. Code 4-21A-R15 Federal
- Fig. 40 Calib. Code 4-21P-R12 Calif.
- Fig. 41 Calib. Code 4-22A-R13 Calif.
- Fig. 42 Calib. Code 4-22B-R00 Exc. Calif.
- Fig. 43 Calib. Code 4-22C-R00 Exc. Calif.
- Fig. 44 Calib. Code 4-22D-R00 Exc. Calif.
- Fig. 45 Calib. Code 4-22D-R10 Exc. Calif.
- Fig. 46 Calib. Code 4-22F-R00 Exc. Calif.
- Fig. 47 Calib. Code 4-22F-R10 Calif.
- Fig. 48 Calib. Code 4-22Q-R00 Exc. Calif.
- Fig. 49 Calib. Code 4-22Q-R00 Calif.
- Connectors
- Grounds
- Specifications
- Electrical Specifications
- Mechanical Specifications
- Alignment
- Automatic Transmission/Transaxle
- Brake Caliper
- Brake Master Cylinder
- Brake Rotor/Disc
- Compressor HVAC
- Differential Assembly
- Distributor, Ignition
- Engine
- Exhaust Manifold
- Firing Order
- Flywheel
- Fuel Pump
- Heater Hose
- Idle Speed
- Pick-Up Coil, Ignition
- Radiator Cooling Fan Temperature Sensor / Switch
- Spark Plug
- Wheel Cylinder
- Wheel Stud / Lug Nut
- Pressure, Vacuum and Temperature Specifications
- Capacity Specifications
- Fluid Type Specifications
- Technical Service Bulletins
- Diagnostic Trouble Codes