Follow these steps. (a) Disconnect the engine coolant temperature sensor connector. (b) Connect the terminals 1 with 2 of the engine coolant temperature. sensor connector. Measure the resistance between terminal 1 and 2. check for open circuit or short circuit. Ideally it should read between 2.0 Kohms to 3.0 Kohms. John Wolf/123rf. A loose fuel cap is one of the most common reasons why the check engine light turns on. The cap is a crucial part of a car’s fuel delivery system. It notably prevents gasoline Car Jerking is going to occur while accelerating as the engine tries to get the right amount of fuel and air. You may also notice more jerking as you hit highway speeds. Additionally, the engine may start misfiring or you could see black smoke coming from the exhaust. Either way, the Check Engine Light normally comes on for an MAF sensor issue. 3. When you press the accelerator pedal, a flap is opening to let more air go into the engine. This is called the throttle body. If there are any problems with the throttle body valve, you might experience limited power because the valve may not open fully. If there are any problems with the throttle body, it will often light up the check engine The flashing light often indicates a misfire, which can cause damage to the catalytic converter. When this happens, the engine should be turned off immediately to prevent further damage. 1. Loose or bad gas cap. It is possible for the check engine light to come on in Sienna due to a loose or bad gas cap. The check engine light could illuminate for a number of reasons, the 5 most common being your: 1. Oxygen sensor needs replacing. This sensor tracks the amount of unburned oxygen in your car’s fuel system. Without fixing, a faulty sensor leads to bad fuel economy and potential spark plug and catalytic converter damage. 2. .

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