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Check Engine Light Tips

1. The Check Engine light tells you the computer found a problem with your vehicle's running condition.

2. If the vehicle is driving OK, a Check Engine light is not a reason to pull over. But get the problem fixed soon.

3. In testing areas, you will fail your emissions test if the Check Engine light is on.

4. Fuel economy generally suffers when the Check Engine light is on.

5. An extended warranty covers emissions-related components that can trigger the Check Engine light. More information is at: epa.gov/obd/warranties.htm.

6. When the Check Engine light is on, one or more "trouble code(s)" are stored in the computer.

7. You can read and erase trouble codes using inexpensive code-reader tools from auto-parts stores; the tools are very easy to use.

8. The problems identified by the codes are frequently easy to fix (such as a loose gas cap), but some are complex, requiring professional diagnosis.

9. A trouble code indicates a circuit where the problem was identified, not necessarily the component itself. Diagnosis is often necessary.

10. The Haynes OBD-II Techbook (Book #10206) is your source for late-model code information. If you have a 1995 or earlier model, get Book #10205. Both books can be found in the Techbook section of this site.

 

 
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FAQ Categories
*Common Questions
*Technical Questions




Common Questions
* What is this site about?
* Where do I go to find a Haynes manual for my vehicle?
* Why can't I find a manual for my vehicle?
* How long does it take to produce a Haynes manual?
* Do you publish your manuals on CD-Rom?
* Do you sell wiring diagrams separately?

Technical Questions
* What is a “complete teardown and rebuild”?
* I am having difficulty following the procedure in your book – what should I do?
* Why does the Contents table send me to the wrong page in the manual?
* What are Ft-lbs. and In-lbs. in the torque tables?
* Is all the equipment on my vehicle covered in the manual?
* Does the manual cover the task I will be doing?




Common Questions
Q: What is this site about?
A: This site is about Haynes and its automobile and motorcycle repair manuals. We hope you will learn about our wide assortment of books on this site and then visit your local auto parts retailer to make your purchase (or order your specific book from the counter represenative if its not in stock). Haynes manuals are here to help you save money when you do it yourself and feel good about the job you did!!


Q: Where do I go to find a Haynes manual for my vehicle?
A: We've made it easy to search for a manual for your specific vehicle on the new Haynes site. You will find a "Vehicle Search" area on the top part of the site pages where you can simply enter your vehicle "Year", the "Make" and "Model" to find out if we have a specific book for your needs.


Q: Why can't I find a manual for my vehicle?
A: Two possible reasons: either it's too new, or the model range doesn't have enough vehicles. We don't normally produce manuals for vehicles less than two years old. And we can't consider doing a manual until there are enough vehicles on the road for us to cover the costs of developing one of our books(including the complete teardown and rebuild costs that we do before every book, and the time/ money to author and print the books).


Q: How long does it take to produce a Haynes manual?
A: From the time a vehicle arrives in our workshop to the time the manual is available is about 5 months. Writing a manual takes a team of technical authors roughly 3 months working with our Haynes mechanic during the vehicle teardown and rebuild, followed by production and printing prior to distribution to retail locations.


Q: Do you publish your manuals on CD-Rom?
A: While the world is moving in an electronic way in most areas, there are times when it makes sense to do things by the established method. Using a book while you are working on your vehicle is one of those cases. Through consumer research, we have found that most people still prefer to take our Haynes manual and place it near them while they are working on their car, truck or motorcycle. They can refer directly to our procedures and photos for the job at hand and they can go back and forth between sections of the book too for a related area. And, a dirty thumbprint on a book isn't much of a problem compared to dirty hands and footprints walking back and forth to a desk computer. Of course, we will continue to monitor the trends through research to see if this changes over time.


Q: Do you sell wiring diagrams separately?
A: No. Every Haynes manual includes a set of wiring diagrams covering the most frequently required circuits. If, after buying a manual, you find that it does not contain the diagram you need, contact Haynes technical support and we will try to help.


Technical Questions
Q: What is a “complete teardown and rebuild”?
A: From the very beginning, Haynes realized the best way to understand a vehicle and write repair procedures was to bring the vehicle into our workshop and actually take it apart – the way you would at home. To do this, we have purchased and disassembled countless vehicles – more than one for every book published. This process allows us to verify the procedures we put into the manual and provide the reader with hundreds of photographs. With mechanics and authors working together on each project, we discover new, simpler methods and work-arounds to avoid using special tools. While the number of parts removed varies from project to project, the teardown is always to the extent necessary to provide the new photographs and develop the new methods required for the manual.


Q: I am having difficulty following the procedure in your book – what should I do?
A: Send us an email: research@haynes.com. We attempt to answer all emails by the next business day. Please let us help you if you’re at all uncertain about what you’re doing.


Q: Why does the Contents table send me to the wrong page in the manual?
A: All Haynes repair manuals have numbered Sections within each Chapter. The Contents refers to these Section numbers, NOT the page numbers. So Section 5 might be on Page 3.


Q: What are Ft-lbs. and In-lbs. in the torque tables?
A: When it is necessary to specify a torque value for a particular fastener, Haynes will provide it in either foot-pounds (ft-lbs.) or inch-pounds (in-lbs.). One foot-pound of torque is equivalent to 12 inch-pounds of torque. Torque values below approximately 15 ft-lbs. are expressed in inch-pounds, since most foot-pound torque wrenches are not accurate at these smaller values.


Q: Is all the equipment on my vehicle covered in the manual?
A: In most manuals, Haynes covers all popular sub-models, engine options and equipment installations. For example, a manual on a Ford Mustang would cover six-cylinder and V8 models, the GT sub-model, manual and automatic transmission and accessories such as ABS and air conditioning. However, sub-models with very limited production, such as an SVT Cobra, may not be included. Any exclusions will be specifically listed in the manual description.


Q: Does the manual cover the task I will be doing?
A: Haynes covers procedures a typical do-it-yourselfer is likely to perform at home, such as maintenance, tune-up and removal/installation of components. When special equipment and knowledge is required, such as with a wheel alignment or a transmission overhaul, the procedure may not be included. Check the Procedure List which follows for more details.


Here is a list of procedures that are generally covered in all Haynes automotive repair manuals. Some procedures may not apply to your vehicle, if the component listed is not installed:


Accelerator cable – removal and installation
Air cleaner assembly – removal and installation
Air conditioning accumulator – removal and installation
Air conditioning compressor – removal and installation
Air conditioning receiver/drier – removal and installation
Air filter – replacement
Alternator – removal and installation
Antenna (radio) – removal and installation
Axle – removal and installation
Axle bearing – replacement
Axle housing – removal and installation
Axleshaft – removal and installation
Balance shaft - removal and installation
Balljoints (suspension) – replacement
Battery – replacement and maintenance
Battery cables – replacement
Blower motor – removal and installation
Brake booster (power) – removal and installation
Brake caliper – removal and installation
Brake fluid level – check
Brake light bulb – replacement
Brake light switch – replacement
Brake master cylinder – removal and installation
Brake pad – replacement
Brake shoe – replacement
Brake system – bleeding
Brake wheel cylinder – replacement
Break-in (engine)
Bumpers – removal and installation
Camshaft cover – removal and installation
Camshaft(s) – replacement
Carburetor – removal and installation
Charging system – check
Chassis lubrication
Clutch components – removal, inspection and installation
Clutch hydraulic system – bleeding
Clutch master cylinder – removal and installation
Clutch release bearing – removal and installation
Clutch slave cylinder – removal and installation
Clutch start switch – replacement
Coil spring (suspension) – replacement
Compression test (engine)
Compressor (air conditioning) – removal and installation
Computer codes – checking (where special equipment is not required)
Computer codes – clearing (where special equipment is not required)
Condensor (air conditioning) – removal and installation
Condensor (ignition) – replacement
Control arm (suspension) – removal and installation
Coolant (antifreeze) – check
Coolant temperature sending unit – replacement
Coolant temperature sensor – replacement
Cooling system servicing (coolant change)
Courtesy light bulb – replacement
Crankshaft oil seals (front and rear) – replacement
CV Joint boot – replacement
Cylinder head – replacement
Dashboard trim panels – removal and installation
Differential – removal and installation (RWD models only)
Distributor – removal and installation
Dome light bulb – replacement
Door – removal and installation
Door handle – removal and installation
Door latch – removal and installation
Door lock cylinder – removal and installation
Door lock switch (power) – removal and installation
Door trim panel – removal and installation
Driveaxle – replacement
Driveaxle boot – replacement
Drivebelt – replacement
Driveplate – removal and installation
Driveshaft – removal and installation
Driveshaft universal joints – replacement
Dwell (ignition) – adjustment (models with points ignition)
Electronic Control Module (ECM) (computer) – replacement
Engine – removal and installation
Engine mounts – replacement
Evaporative Emissions (EVAP) system – component replacement
Exhaust Gas Recirculation (EGR) valve – replacement
Exhaust manifold – removal and installation
Exhaust system – component replacement
Fan (cooling system) – removal and installation
Fan (heating and A/C) – removal and installation
Fender (front) – removal and installation
Flexplate – removal and installation
Flywheel – removal and installation
Freon – recharging
Front main seal (engine) – replacement
Fuel injectors – replacement
Fuel level sending unit – removal and installation
Fuel lines – removal and installation
Fuel pressure – relieving
Fuel pressure regulator – removal and installation
Fuel pump – removal and installation
Fuel rail – replacement
Grille (radiator) – removal and installation
Hall Effect switch (ignition) – replacement
Hazard flasher – replacement
Headlight – replacement
Heater core – replacement
Hood – removal and installation
Hub and bearing (4WD models) – replacement
Idle Speed Control (ISC) motor – removal and installation
Ignition coil – removal and installation
Ignition key lock cylinder – replacement
Ignition module – replacement
Ignition pick-up coil – replacement
Ignition switch – replacement
Ignition system – checking
Ignition timing check (when a part of maintenance)
Instrument cluster – removal and installation
Intake Air Control (IAC) valve – removal and installation
Intake manifold – removal and installation
Intake plenum – removal and installation
Jacking
Leaf spring (suspension) – replacement
Lifters (engine) – removal and installation
Liftgate – removal and installation
Liftgate latch – removal and installation
Liftgate trim panel – removal and installation
MAF (Mass Airflow) sensor – replacement
MAP (Manifold Absolute Pressure) sensor – replacement
Neutral Start Switch – replacement
OBD-II codes – checking
Oil change (engine)
Oil filter (engine) – replacement
Oil level (engine) – check
Oil pan – removal and installation
Oil pump – removal and installation
Parking brake – adjustment
Pilot bearing (clutch) – replacement
Pinion seal (differential) – replacement
Points (ignition) replacement
Power door lock motor – removal and installation
Power door lock switch – removal and installation
Power steering fluid level check
Power steering pump removal and installation
Power steering system – bleeding
Power window motor – removal and installation
Power window switch – removal and installation
Powertrain Control Module (PCM) (computer) - replacement
Pushrod (engine) – replacement
R-12 recharging
R-134a recharging
Radiator – removal and installation
Radio – removal and installation
Rear main seal (engine) – replacement
Rear window defogger – check and repair
Refrigerant recharging
Rocker arm cover – removal and installation
Rocker arms (engine) – removal and installation
Seats – removal and installation
Shift cable (transmission) – replacement
Shift lever – removal and installation
Shift linkage (transaxle) – adjustmen
t Shift linkage (transfer case) – adjustment
Shift linkage (transmission) – adjustment
Shock absorber – removal and installation
Spark plug replacement
Spark plug wires – replacement
Speakers – removal and installation
Speedometer (instrument cluster) – removal and installation
Stabilizer bar (suspension) – removal and installation
Starter motor – check
Starter motor – removal and installation
Starter solenoid – replacement
Steering gear removal and installation
Steering knuckle (suspension) – removal and installation
Steering wheel – removal and installation
Stereo – removal and installation
Strut (suspension) – removal and installation
Tailgate – removal and installation
Taillight bulb – replacement
Tappets (engine) – removal and installation
Thermostat (cooling system) – replacement
Throttle body – removal and installation
Throttle Body Injection (TBI) – disassembly and reassembly
Throttle cable – removal and installation
Throttle Position Sensor (TPS) – removal and installation
Throwout bearing (clutch) – replacement
Timing belt/chain – replacement
Timing chain cover – removal and installation
Tire rotation
Torsion bar (suspension) – removal and installation
Track bar (suspension) – removal and installation
Transfer case – removal and installation
Transfer case fluid level check
Transmission fluid change
Transmission fluid level check
Transmission mount – replacement
Transmission or transaxle – removal and installation
Trunk latch – removal and installation
Trunk lid – removal and installation
Tune-up
Turn signal flasher – replacement
Turn signal light bulb – replacement
Turn signal switch – replacement
U-joints (driveshaft) – replacement
Valve adjustment (when a part of maintenance)
Valve cover – removal and installation
Voltage regulator (charging system) – replacement
Water pump – check and replacement
Wheel bearing replacement and adjustment
Wheel cylinder (brake) – replacement
Window – removal and installation (sliding glass only)
Window switch (power) – removal and installation
Wiper (windshield) motor – replacement
Wiper (windshield) – replacement




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