How do you test a car test light?
Step 2 – Before staring any testing the test light itself must be tested, connect the clip or clamp to a known ground source, in this case the battery negative terminal is being used but almost any metal surface on the vehicle will work.
How to find the source of a check engine light?
To find the source of a “Check Engine Light”, a scan tool or PC Software (if available) can be used. Many of the auto parts stores will scan your car for free. Use the information to identify the sensor circuit that has the problem.
Is the old test light bad for your car?
The old style test light can damage auto electronics. Using a test light to check for circuit voltage is a tried-and-true diagnostic method. But if you probe a computerized circuit with your old incandescent test light, you can fry some sensitive and expensive electronics.
How to clear check engine light and pass emissions test?
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Why does my car turn on the Check Engine light?
When your car’s computer detects a problem that could cause an increase in harmful emissions (Smog), it will set a diagnostic trouble code (DTC) and turn on the “Check Engine Light”.
What to do about an illuminated check engine light?
When a car comes into a shop with an illuminated check engine light (MIL), the vehicle should be properly diagnosed and repaired. In some cases the check engine light may be cleared as part of the diagnostic process.
What should I do if my car computer says something is wrong?
When any of these issues arise, the car computer should report an error code that determines the source of the problem. Consult your trusted mechanic to read these error codes and to eliminate other potential causes of an illuminated check engine light.
Can a sensor turn on a diagnostic trouble code?
Normally a problem with a monitored system, sensor, or other component, will trigger a diagnostic trouble code and the computer will turn on the check engine light. However, sometimes an under-performing system that is on the verge of failure will prevent the completion of a test, but not trigger a diagnostic trouble code.