| CAUSE | METHOD OF ELIMINATION |
| The starter does not work | |
| The battery is discharged | Charge the battery |
| When terminals 30 and 50 are connected, the starter starts working | Restore the starter power supply circuit |
| Open or short to ground in starter wire | Check the condition of the wires and replace them if necessary |
| Current loss due to loose or oxidized wire contacts | Clean the contacts and secure the wires |
| There is no voltage at terminal 50 of the traction relay | There is a break in the starter power supply circuit that needs to be repaired |
| The starter rotates slowly and does not turn the engine crankshaft | |
| The battery is discharged | Charge the battery |
| Current loss due to loose or oxidized wire contacts | Clean the contacts and secure the wires |
| Carbon brushes do not fit tightly enough to the commutator or are defective | Check the condition and replace the carbon brushes if necessary |
| Carbon brushes do not make contact with the commutator | Replace the carbon brushes |
| The working surface of the collector is damaged | Grind the working surface of the collector or replace the anchor |
| The voltage supplied to the starter is less than 10 V | Check the starter relay or traction relay |
| The traction relay is faulty | Replace the traction relay |
| The starter works fine, but does not turn the engine crankshaft | |
| Starter drive gear dirty or defective | Clean or replace the starter drive gear |
| The flywheel ring gear is worn out | Replace flywheel |
| The starter gear does not disengage from the flywheel ring gear | |
| The starter drive pinion or the screw thread on the starter shaft is dirty or damaged | Clean or replace the starter pinion or armature |
| The traction relay is faulty | Replace the traction relay |
| The return spring has become weak or broken | Replace the return spring |
| The starter continues to operate after it is turned off with the ignition key | |
| Burning of traction relay contacts | Immediately turn off the ignition or remove the ground cable from the battery |
| The ignition switch does not turn off the starter | Immediately remove the ground cable from the battery and replace the ignition switch |
Execution order
1. If you do not hear the traction relay click when you turn on the starter and the starter motor does not run, check if voltage is supplied to terminal 50.
2. When the engine starts, the voltage at terminal 50 should be at least 10 V. If the voltage is below 10 V, check the electrical power circuit of the starter.
3. To check the condition of the starter electrical circuit, follow these steps:.
4. Apply the handbrake and set the gearshift lever to neutral. Turn on the ignition.
5. Using an additional 4mm² wire, connect terminals 30 and 50.
6. If the starter motor starts to rotate, then the electrical circuit of the starter power supply is faulty.
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