Repair 7

You can clear the electronic steering wheel code on your BMW right from your home garage, saving yourself time and money. The BMW comes standard with an On-Board Diagnostics computer that receives and stores trouble codes sent to it from sensors positioned throughout the vehicle, including from the electronic steering wheel. After repairs have been made, the computer codes need to be reset so any warning lights shut off and the computer can continue to properly monitor the mechanical and electrical functions of the vehicle.

Instructions

1

Pop up the hood of your BMW and prop it up with the safety bar.

2

Locate the negative battery terminal. Find the clamp on the terminal, which has a nut on top of it. Loosen that nut with a wrench. Slide the clamp off of the negative battery terminal, making sure it doesnt touch metal or the positive terminal.

3

Wait 30 minutes while the computer resets itself, thus clearing all codes.

4

Reattach the clamp to the negative terminal and tighten the nut. Lower the hood of the car.

5

Put the key into the ignition and start the engine. Verify the electronic steering wheel light is shut off the instrument panel.

You can decode your Chevy Camaros engine codes using a handheld OBD I or II scan tool. Camaros manufactured 1996 or later use an OBD II scan tool; earlier model Camaros require an OBD I scan tool. These scan tools can be purchased from your local auto parts retailer. The Camaro has an On-Board Diagnostics (OBD) computer which receives and stores trouble codes which can be decoded using the scan tool. The codes are looked up in a manual, allowing you to diagnose your Camaros malfunctions.

Instructions

1

Find the diagnostic port under the steering column. It is the same shape and size as the OBD scan tools connective end. Caully plug the scan tool into this port. You may have to rotate the scan tool to get it to fit into the port correctly.

2

Put the key into the ignition and turn it to the "On" position, but dont start the engine. This will power on most scan tools. If not, look for the "on/off" switch on the scan tool and turn it "on."

3

Wait for the scan tool to interface with the Camaros computer and retrieve the codes. On some scan tools you have to press a "Read Codes" button. Refer to the scan tools manual if you are unsure.

4

Write down the error codes and look up their meanings in the scan tools manual. Have the Camaro serviced or repaired based on the information gathered from the codes.

You can reset the trouble codes on your 1993 Volvo 850 right from your home garage, saving time and money. The On-Board Diagnostics I computer (OBD I) receives and stores trouble codes sent to it from sensors positioned throughout the car. The computer alerts you to any malfunction or service need by illuminating a warning or service light on the instrument panel. After the scan tool reads the codes, and after you have had the vehicle serviced or repaired, then you or your mechanic can reset the trouble codes by using the same OBD I scan tool.

Instructions

1

Located a port on the lower part of the drivers side dashboard near the hood release handle. This port should be the same size and shape as the connector on the OBD I scan tool. Plug the scan tool into this port.

2

Put the key into the ignition and turn it to the "On" position, but dont start the engine. This will turn on the scan tool.

3

Wait for the scan tool to read the trouble codes. Look for a command that says "Delete Codes" or a similar command. Select this command. Wait for the scan tool to complete the task. It will indicate that it has finished by displaying "Command Sent" or it will return you to the main menu. Scan tools vary a bit according to which company manufactured it.

4

Unplug the scan tool and turn on the engine. Verify that all warning and service lights have shut off of the instrument panel.

The Volkswagen New Beetle, like many other vehicles made in recent years, is equipped with a radio that requires a code to properly function after being disconnected from its power source. This feature is designed to make the radio as useful as a paperweight in the event of theft. The need for a radio code has served to reduce the theft of original equipment manufacturer (OEM) radios, but it also makes it annoying for owners who have removed their radios for various reasons, including replacement and service.

Instructions

Instructions

1

Find the VW owners manual in the glove box. Find the card inside the owners manual that contains the radio code. This code is provided when the car is first purchased from the dealership. In some cases, the card may be misplaced before or after the vehicle is sold to another person.

2

Look for the Vehicle Identification Number (VIN) of the New Beetle if the VW owners manual does not contain the radio code. You can find the VIN near the bottom of the windshield on the drivers side of the vehicle. Write this information down on a piece of paper.

3

Remove the radio from the dashboard. You will need a set of radio removal keys, available for purchase at most car audio outlets. Insert the radio removal keys firmly into the two slots along the bottom edge of the radio then pull the radio out of the slot. Look for the radio serial number located on the back of the unit. This number will start with "vw4z7" or a similar identifier. Write this serial number down on the same piece of paper as the VIN for safekeeping.

4

Take the information written down to the nearest VW dealership and request that they find your radio code with the information provided. Both the VIN and radio serial number are required for the dealership to successfully find your radio code. Upon finding the radio code, write it down in the owners manual or someplace else where you can safely store it.

The computer in a car generates an error code and turns on the "Check Engine Light" when it runs a diagnostic of one of the electrical circuits in the car and finds something that is out of bounds. Error code 441 refers to the part of the cars emissions system that deals with fumes in the gas tank. It has to be dealt with before the error code can be cleared.

Error 441

All fuel tanks allow the fuel inside to evaporate slightly. Before emissions controls, the car simply dumped the fumes into the outside air, increasing pollution. Cars with emission control systems send these fumes to a canister filled with charcoal to be stored. At intervals, the emissions system opens a valve in the canister and purges the fumes by drawing them through a hose to the engine. The computer chip checks the process by pumping air out of the system to see if the canister responds. If it doesnt, it reports error 441, which means that something has interfered with this process and the canister hasnt been purged.

Possible Causes of Error 441

The error could come about because of a faulty canister or switch, a broken or damaged hose, a failure in the computer chip that controls the purge or a break in the electrical circuit controlling the process.

Cures for Error 441

Depending on the cause of error 441, the cure could be replacing the pump that tests the system, replacing the canister or hoses, repairing or replacing a component in the electrical circuit, replacing or reprogramming the cars computer chip or replacing the vacuum switch controlling the flow of fumes from the canister to the engine.

Audi created the radio in a 1998 A4 with security in mind. The radio has a built in anti-theft system that locks out the radio functions whenever it loses battery power. This loss of power could be caused by a disconnected battery, faulty battery or simply a battery with a low charge. Regardless of the reason for loss of power, a security code is required to restore the radio to its normal operating condition. If youve lost your radio code, youll need to gather some information and visit your local Audi dealership in order to obtain a new radio code.

Instructions

1

Locate your motor vehicle title or registration and put it in a folder that you can take to the dealership. This has your 17-character VIN on it and proves your ownership of the vehicle.

2

Disconnect the negative battery terminal on your battery, using a battery terminal wrench.

3

Insert both special radio removal tools into the front slots on the radio press them down until they detach the radio retaining tabs. Grip both special tools and pull the radio out of the dashboard.

4

Look on the top or the back side of the radio for a serial number. Write this number down on a piece of paper and put it in the folder with your vehicles registration.

5

Depress the locking tabs on the back of the radio to remove the tools, then set the radio back into the dashboard and press it into place until it is flush with the dash and you hear the locking tabs engage.

6

Reconnect the negative battery terminal. Travel to your local Audi dealership and visit the service department. Tell them that you need a code for your radio. Wait while they access the security database on their computer, then provide your VIN and proof of ownership along with your radio serial number. They will input this information into the system to obtain your radio code.

As a theft deterrent system, Mitsubishi programs its car radios with a 4-digit code that locks the audio system when tampered with. Trouble is that sometimes the system locks up even on legitimate owners, leaving them without the ability to play compact discs or use the radio.



If you see a prompt that reads "Code," dont sweat it, the user manual should contain a reset code. If no manual is available, Mitsubishi hosts a website which will send you the code as long as you have your vehicles VIN and the radios model and serial numbers.

Instructions

Locate and reset the lock code

1

Locate 2001 your original Galant owners manual. Note that it must be the one that came with your vehicle; replacement manuals will not have the appropriate code.

2

Insert key into ignition and set to "ON" or "RUN" position. Turn on radio.

3

Enter 4-digit code that appears in owners manual by depressing preset buttons on the radio deck.

The 2001 Chevy Silverado 1500 came with either a 4.3-liter six-cylinder, 4.8-liter eight-cylinder or a 5.3-liter eight-cylinder engine. The six cylinder base model was offered with a five-speed manual transmission, but the extended cab and other models equipped with an eight-cylinder only included a four-speed automatic transmission; with or without four-wheel drive. Despite the many differences and options available all of them have a fuel tank pressure sensor that is used to detect the amount of pressure or lack there of. Code P0452 is directly related to this sensor, but the reason your Silverado is displaying this trouble code can vary and will require some inspection.

Fuel Pressure Sensor Operation

The fuel pressure sensor is connected to the powertrain control module or PCM via a five volt reference signal and a ground. The sensor relays a voltage back to the PCM in relation to the amount of pressure inside the gas tank and is used to detect leaks in the evaporative emissions system. A high voltage return signal indicates tank pressure is low and a lower voltage return signal indicates a higher tank pressure.

The Trouble Code

Code P0452 is set anytime the ignition is on and the return voltage signal is less than .1-volts for longer than five seconds. The code will not be set until the PCM test fails twice consecutively when the ignition is cycled. In general code P0452 indicates an evaporative system leak somewhere in the system or a failure with the fuel pressure sensor. Double check your diagnostic trouble codes before attempting diagnoses because if P1639 was also set with P0452 there is a short to ground in the 5-volt reference circuit inside the PCM, requiring the PCM be replaced.

Checking The Fuel Pressure Sensor

The fuel pressure sensor on your Silverado is connected to the fuel pump module and is located inside the tank; however, the harness connector extends upward and is outside of the fuel tank. There are three wires connecting the PCM to the sensor; grey is for the five volt reference signal, black is the pcm connected ground and dark green is for the signal sent back to the PCM. First and foremost check the wiring harness from the sensor connector to the PCM for any damage and fix as necessary. Disconnect the pressure sensor harness and set your digital multimeter to the volts setting. Turn the ignition key to the on position and probe the gray wire and black wire, you should receive five volts in this case the PCM is sending the proper signal and is not at fault. Connect the harness to the sensor and probe the dark green wire with the positive multimeter probe and direct the negative to a known good ground. ; if there is no reference signal the sensor is faulty and needs to be replaced. If the signal is between .1 and 5 volts examine the harness up to the PCM for a break in the circuit.

Replacing the Sensor

Replacing the sensor will require draining the fuel tank and lowering the tank from the vehicle. As always remember to relieve fuel system pressure by depressing the schrader valve on the fuel rail with a screwdriver wrapped in a shop towel. Disconnect all fuel tank lines, connectors and vacuum lines, then remove the tank from under the vehicle. Remove the fuel pump lock ring and remove the module. Remove the screw for the sensor, it is located just above the electrical pump. Install the new sensor and set the harness into place. Lower the module into the tank and replace the lock ring gasket. Tighten the fuel tank straps to 30 foot-pounds alternating back and forth. Use a scan tool to clear any trouble codes before driving the vehicle.