![]() ![]() Sometimes the carbon brushes or other parts inside the starter motor wear out and the starter motor stops working.įor example, a failed starter motor was common in some Toyota Corolla and Matrix models. We only noticed this after disconnecting the control wire connector.Ĭleaning the terminal and replacing the connector solved the problem.Īnother part that often fails is the starter motor itself. ![]() For example, this corroded starter control terminal was the cause of a no-start, no-crank condition in the Mazda 3. Sometimes the starter control terminal gets corroded (in the photo) or a starter control wire gets loose or disconnected from the terminal causing the starter not to work. In cars with a push button start, the system disengages the starter motor as soon as the engine starts running.Ĭorroded starter solenoid control terminal The starter motor turns over the engine crankshaft fast enough to allow the engine to start.The flexplate (flywheel) is attached to the engine crankshaft. At the same time, the starter solenoid throws the starter gear forward to mesh it with the engine flexplate gear (or flywheel gear in a manual transmission).The starter solenoid closes the high-current circuit and sends power to the starter motor.The starter relay closes the starter control circuit and activates the starter solenoid.If all checks pass, the engine computer activates the starter relay.The START position, or press the START button, the engine computer (PCM) checks if the transmission is in Park or Neutral, if the brake pedal (Automatic) or clutch pedal (Manual) is depressed and if the steering lock is unlocked (in some cars). When you turn the ignition key to ON position, the engine computer (PCM) checks if the ignition key security code matches (immobilizer).Often, a poor connection at one of the battery cables can cause the starter motor not to work. The positive cable connects the positive " +" battery terminal to the starter solenoid. The negative (ground) cable connects the negative " -" battery terminal to the engine cylinder block, or transmission, close to the starter. That's why it's connected to the battery with thick cables (see the diagram). Steps to diagnoseĪs we mentioned, the starter motor requires very high electric current to turn over the engine. Signs of automatic transmission problems.How to check the engine when buying a used car.How to get the best deal on a used car?. ![]() Buying a Used Car: 10 Common Mistakes to Avoid. ![]()
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