PROBLEM | POSSIBLE CAUSES | SOLUTIONS & TEST POINTS |
| Dead battery, very low charge, or bad battery contacts. | Check the battery charge. If low, recharge it or replace it. Also, clean the battery connections. |
Blown fuse. | Check all fuses that power the ECU, Alarm or Immobilizer system. Sometimes, there are 3 to 5 fuses to check. | |
Bad starter relay. | Check that the starter relay is working properly. | |
Seized starter motor, or not working properly. | Try powering the starter motor directly to test if it can crank the engine. | |
Faulty ignition switch. | Ensure that all contact points on the ignition switch are spreading power and ground throughout the car. | |
Broken, short-circuited, dirty or corroded Control Unit harness connectors causing bad contacts. | Ensure all the Control Unit harness connectors are not broken or have a short-circuit problem. Also, clean any rust or corrosion. Ensure a tight fit. | |
Clutch pedal switch on Manual Transmission cars not engaged or faulty. | Ensure that the clutch pedal switch signal is present when trying to start the car. | |
Electronics are missing an additional essential ground point. | Check that all the car's ground points have clean and tight connections, and no short circuits. | |
The car’s immobilizer “Drive-Block” is activated (Porsche 993 models). | Disable the "drive-block" system by pressing on the key fob button. | |
The alarm or the car might be activated. | See if there is a way to disable or bypass the alarm system. | |
The EWS and DMR are not in sync (BMW models after 1995). | With a BMW compatible scanner, perform a DME to EWS alignment/synch. |
| WARNING Some of the testing procedures described in this guide could be dangerous if done improperly. We recommend that they are performed by an ASE certified mechanic |
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