A check of the suspension on all four wheels would be performed to check the tone rings and wheel speed sensors. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another. How does a mechanic diagnose the P0502 code? Clear all codes after repairs are complete, and operate the vehicle normally before rescanning the system to see if any codes return. Operate the vehicle at a steady speed and compare the data from the scanner with the reading on the speedometer. Next, check all wiring and connectors that lead to the speed sensor.
The only thing to worry about with this trouble code is getting a speeding ticket due to the inaccurate speedometer. Some car manufacturers then close the vent solenoid but leave the purge solenoid open. The leak detection pump is part of the evaporative emissions system. This system tests the fuel system to make sure it is not leaking fuel vapors into the air. Rear brakes can make the pulsation as well. Re: P0502 - speed sensor - Replace? While not car-threatening, it's good to take care of this right away to improve gas mileage. Many people like the looks of very large wheels on their vehicle.
After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. Again, the exact procedure wil depend on your make and model of vehicle. You'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the car! Step 2 Assuming that there are no other codes present, or that additional codes have been resolved, refer to the manual to identify and locate the primary vehicle speed sensor on the transmission, as well as all associated wiring and connectors. The computer notices the canister is empty when it detects a leaner condition all the vapors are used up and it resumes normal fuel delivery. All you need to do is take the old one off and screw on the new one.
The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing. Start your diagnosis through a visual inspection of the wiring system, connectors, and speed sensors. Clear all codes after repairs are complete, and operate the vehicle normally before rescanning the system to see if any codes return. For usage guidelines, see the. When the check engine light comes Saab Sonett P0502 code on the first you should check is the gas cap.
Failure to do this will almost certainly result in a misdiagnosis, wasted time, and the unnecessary replacement of parts and components. Step 4 If the fault persists but there is no visible damage to the wiring, prepare to perform resistance, continuity, ground, and reference voltage tests on all associated wiring, but be sure to disconnect the vehicle speed sensor from all relevant control modules to prevent damaging one or more modules during this step. Please remember that you are not anonymous. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself. Bear in mind that the primary vehicle speed sensor input data will derive from the primary vehicle speed sensor located in or on the transmission.
This causes the ignition coil to provide a spark and the injector to inject fuel into each cylinder at the right time. This trouble code is not very serious at all due to the fact that it does not cause any drivability issues. Some Saabs require the replacement of the whole hub assembly. If the site helps you, please consider helping the site by becoming a member. If the brake warning lamp does not illuminate at these times, or remains on after releasing the parking brake, seek service immediately. How serious is the P0502 code? The determines the vehicle speed based on the frequency of these pulse signals.
The instrument cluster receives a signal from the vehicle speed sensor so it is important to check there first. After this signal is converted into a P0502 code. Note that control module failure is rare, and the fault must be sought elsewhere before any control module is replaced What are the symptoms of code P0502? Step 6 Steps 1 through 6 will almost certainly resolve code P0502 on most applications; however, if the affected application uses more than one speed sensor, perform the all of the steps outlined above on all speed sensors until the fault is both identified and repaired or until it becomes clear that these steps cannot resolve the issue. Other than a Check Engine Light and an inaccurate speedometer, there should be next to no symptoms associated with this trouble code. Classifieds are to be listed in pages. If the sensor requires a 5-volt reference voltage refer to the manual to determine this , pay particular attention to this circuit. ² Brake force distribution system failure.
Did you replace the front and rear or just the front? Be sure to determine the function, color-coding, and exact routing of all relevant wiring at this point to avoid testing the wrong circuit later on. If either sensor isn't working correctly, the car will run rough and the engine will be less efficient. I had a bulb out in the 3rd brake light cyclops but replaced it. P0502 Saab Possible Solution: In-line Ford engines, along with those of most other manufacturers, begin the numbering of cylinders at the front and proceed in numerical order toward the back. However, narrow the scanners monitoring function down to only include data from the speed sensor in order to obtain the most accurate test results. Retrieve all stored trouble codes and their freeze-frame data by connecting the scanner to the diagnostic port of the vehicle.