Tip & How-To about Ford Focus
If you do not have any power at all, and the dash is not turning on, then check the battery connections, and the connection from battery ground to the engine body.
Also ensure you have tested the battery. Read the voltage across the positive battery terminal and a ground connection on the engine body. It must be around 12.5V
If there is no problem in there , then the problem is the ignition cylinder. The ignition cylinder can be tested reading voltages at its contacts. This in case there is no power at all.
If instead the dash is turning on, but the starter motor does not turn over, then there may be more reasons for the fault.
To start, look for the starter fuse. This is a large fuse, probably a 30 Amps. Look also for a5 or 10 Amp fuse to the ECU/PCM (main car computer module. If any of this fuses has blown, it can cut power to the starter motor.
After testing the fuses, check the starter relay. This is usually located in the fusepanel under the hood, or under the dash. The relay must click when the key is turned. The relay can be tested in fullusing a Volt meter or an Ohm meter.
The starter relay can also be tested swapping it with a relay of the same kind.
Fuses and starter relay are the most common failure when the car dash comes on, but the car does not start.
If this test good, ensure that the anti theft system is not armed (starter should still turn over by the way).
If fuses and relay are good, read volts at starter motor, while machineis cranking. You will need to use Voltmeter on the contacts at theback of the starter motor solenoid. If there are 12 Volts at startermotor, but motor does not turn over, then starter motor or startersolenoid is faulty.
The starter solenoid can be tested using an Ohmmeter at its contact. Ifthe solenoid is bad, reading with multimeter set on impedance, it willhave no continuity (it will read infinite Ohms).
If there is no volt, or volt is much below 12 Volts, then the problemis either the ignition switch located in the steering column, or aproblem concerning wiring from ignition.
The ignition switch can be tested jumping its contact, reading Volts orOhms on its terminals. To access the switch it is necessary to takeapart the steering column.
Posted by Ginko on
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