No Start Diagnosis
How is a no-start diagnosis performed?
The technician will try to start the vehicle and observe what happens. There may be no sound, a clicking sound, or the car may sound like it's cranking normally but just failing to catch. The dash lights should dim when the key is turned, and the fuel pump should be heard at some point before the key is turned to start the engine.
In most cases, no-start problems are caused by the starting and charging system. The technician can test this system using a diagnostics machine. If the starting system functions properly, the technician will use a different scanner to read OBD trouble codes, and will test other components or read sensor inputs.
How is a no-start diagnosis fixed?
Correcting most no-start problems usually involves replacing the alternator, starter or battery, cleaning connections, ignition system repairs, or fuel system repairs. But because there are so many potential causes, the diagnosis is key to understanding how expensive the repair will be.
Can I perform no-start diagnosis myself?
Most people with car knowledge can learn to diagnose the starting and charging system, which is the root of most no-start issues. But with so many potential causes, this diagnosis is usually best left to a professional.