How to check your car's starting device yourself: from symptoms to repair

The starter is the heart of the engine's electrical starting system, and its malfunction can immobilize the car at the most inopportune moment. According to car service statistics, up to 30% of calls The “car won’t start” problem is associated precisely with breakdowns of the starting device. At the same time Bosch, Valeo and Denso - leaders of the starter market - claim that 80% of malfunctions can be diagnosed without professional equipment, with only a multimeter and basic skills.

In this article we will look not only how to check the starter for functionality in a garage environment, but we will also learn to distinguish its breakdowns from problems with the battery, ignition switch or alarm. You will find out what hidden symptoms indicate wear on the solenoid relay or bendix even before the starter completely fails, as well as how to interpret the results of testing using the winding resistance table. The instructions are suitable for most modern cars - from VAZ 2110 up to Toyota Camry 2020+.

Signs of a bad starter: when to check

The first signs of problems with the starting device are often ignored until the car stops starting altogether. Experienced auto mechanics highlight 5 Key Symptoms, in which diagnostics of the starter becomes mandatory:

• 🔋 Clicks without scrolling. The starter makes a series of clicks, but the crankshaft does not rotate. This is a sign insufficient current on the solenoid relay or wear bendix.
• 🔄 Slow rotation. The engine cranks barely, although the battery is charged. Culprit - brush wear or bearings.
• 🔥 Burning smell. Appears when the windings overheat due to a short circuit or prolonged startup attempts.
• 🔊 Grinding or squealing. Indicates wear bendix overrunning clutch or damage to the flywheel teeth.
• 🚗 Spontaneous startup. The engine continues to run after the ignition key is released - a symptom sticking contacts in the solenoid relay.

It is important to distinguish between starter problems and a dead battery. For example, if when you turn the key dashboard goes dark, and the starter makes weak clicks - the battery is to blame. But if the device works fine, but the starter is silent or rotates jerkily, that is where the problem lies.

Preparing for diagnostics: tools and safety measures

Before testing the starter, make sure you have:

• 🔧 Multimeter (preferably with resistance measurement mode up to 200 Ohms).
• 🔩 Set of keys (carob or cap on 10, 13 mm).
• 🔋 Wires for "lighting" (for testing under voltage).
• 🧲 Screwdriver with insulated handle (to close contacts).

Security measures:

• ⚡ Disable negative battery terminal before removing the starter.
• 🔥 Do not check the starter for a spark - this may damage the windings.
• 🚫 Do not hold your fingers on the rotating parts when testing.

⚠️ Attention: If your car is equipped with a system Start-Stop (for example, Mazda Skyactiv or BMW EfficientDynamics), before diagnosing the starter, be sure to reset the errors in the control unit. In these systems, the starter operates in overdrive, and testing it without resetting may give false results.

Method 1: Checking the starter without removing it (on the car)

This method allows you to diagnose solenoid relay and electric motor starter without dismantling it. Fits most models including Renault Logan, Hyundai Solaris and Kia Rio.

Step 1: Checking the Solenoid Relay:

1. Turn the ignition key to position ON (but do not start the engine).
2. Use a screwdriver to close battery positive terminal and starter control contact (thin wire on the solenoid relay).
3. If the starter spins, the problem is control circuits (ignition switch, alarm). If it clicks but doesn’t turn, it’s faulty solenoid relay.

Step 2. Checking the electric motor:

1. Disconnect power wire from the solenoid relay (thick cable going to the battery).
2. Close with a screwdriver battery positive terminal and released contact on the starter.
3. If the armature rotates, the electric motor is working properly, the problem is solenoid relay or Bendix.

Method 2: Check with a multimeter (with removal of the starter)

For accurate diagnosis, the starter must be dismantled. On most cars it is attached two or three bolts to the gearbox housing. After removal, clean the housing from dirt and check:

1. Solenoid relay:

• Connect positive multimeter probe to control contact, and minus - to the body.
• There must be resistance 0.5–1.5 Ohm. If it shows 0 ohm - short circuit if ∞ - break.

2. Armature and stator windings:

element	Normal Resistance (Ohm)	Reason for deviations
Armature winding	0.1–0.5	Interturn short circuit or commutator wear
Stator winding	0.3–0.7	Open or short circuit to housing
Brushes	0.2–0.4	Wear or contamination from graphite powder

To check windings for breakdown Switch the multimeter to the “testing” mode and touch the probes one by one:

• 🔌 Starter housings and winding terminals (must be ∞).
• 🔌 Armature commutator and core (must be ∞).

⚠️ Attention: If, when checking the windings, the multimeter shows resistance less than 0.1 Ohm, this indicates interturn closure - such a starter must be replaced. Attempts at repair (rewinding) will cost more than a new device from Bosch or Valeo.

Method 3: Checking the Bendix and Overrunning Clutch

Bendix (or overrunning clutch) is a unit that transmits rotation from the starter to the flywheel and prevents kickback. Its malfunction appears grinding or slipping at startup. To check:

Visual inspection:

• 🔍 Check it out gear teeth for chips and wear (permissible wear is no more than 30% of the tooth height).
• 🔄 Turn the gear manually: in one direction it should rotate freely, in the other it should be blocked.

Slip test:

1. Secure the starter in a vice (or have a helper hold it).
2. Connect plus battery to force contact starter, and minus - to the body.
3. If the bendix does not extend or scrolls in both directions, replacement is required.

What happens if you drive with a faulty bendix?

Slipping of the overrunning clutch leads to shock loads on the flywheel teeth, which can cause them to chip. In critical cases, broken flywheel teeth end up in the gearbox housing, leading to gearbox jamming and major repairs (cost from 50,000 rubles).

Method 4: Diagnostics by current consumption

This method requires current clamps or a multimeter with a current measurement function up to 200–500 A. It allows you to identify wedging starter or increased resistance in the chain. Normal current values:

• 🔋 Gasoline engines (1.4–2.0 l): 80–150 A.
• 🔋 Diesel engines (1.6–3.0 l): 150–300 A.

How to measure:

1. Connect the current clamp to positive wire starter.
2. Ask a helper to crank the engine (no longer than 3-5 seconds!).
3. If the current exceeds the norm by 30% or more, this indicates:

• 🔧 Contamination or wear brushes.
• 🔧 Wedging bearings anchors
• 🔧 Interturn closure in windings.

Method 5: Checking signals from the ECU (for modern cars)

Vehicles with the system CAN-bus (for example, Volkswagen MQB, Ford Focus 3) can produce starter errors in the form of codes. To read them you will need diagnostic scanner (for example, ELM327 or Launch CReader). Common codes:

Error code	Description	Probable Cause
P0615	Starter control circuit	Broken wire, faulty relay or ECU
P0616	Invalid Starter Circuit Signal	Short circuit or worn brushes
B2401	Solenoid relay malfunction	Contacts sticking or winding broken

If the scanner shows errors U-type (for example, U0100), the problem may be CAN bus, and not in the starter itself. In this case, it is necessary to check the wiring from ECU up to fuse box.

Common mistakes when checking and how to avoid them

Even experienced car owners make mistakes that lead to false conclusions or damage to the starter. Here are the most common:

• ❌ Checking for spark. Shorting the starter contacts with metal objects (for example, a wrench) can cause arc discharge, which will burn the windings.
• ❌ Long rotation. Starter cranking more 10 seconds overheats the windings in a row and discharges the battery.
• ❌ Ignoring mass. Poor contact negative wire with the body can simulate a starter malfunction.

To avoid errors:

• 🔧 Always clean the terminals starter and battery before checking.
• 🔧 Use wires with "crocodiles" for a secure connection.
• 🔧 Check the starter at temperatures above +5°C — in the cold, the resistance of the windings increases, which distorts the results.

FAQ: Frequently asked questions about checking the starter

Is it possible to check the starter without removing it from the car?

Yes, but only solenoid relay and electric motor. For complete diagnostics (checking the windings, bendix, brushes), the starter must be removed. Without removal you can determine:

• 🔹 Performance of the retractor relay (by clicks).
• 🔹 Serviceability of the electric motor (by rotation when directly connected to the battery).
• 🔹 Problems with the control circuit (ignition switch, relay).

How to distinguish a faulty starter from a dead battery?

Take the test:

1. Turn on high beam and try to start the car.
2. If the light fades when the starter rotates - the problem is battery.
3. If the light does not change, but the starter turns weakly - it’s the fault starter.
4. If the starter clicks but doesn't turn, and the light is bright - faulty solenoid relay.

How much does it cost to repair a starter?

The cost depends on the type of fault:

• 🔧 Replacement solenoid relay: 1 500–3 000 ₽.
• 🔧 Replacement bendix: 2 000–4 500 ₽.
• 🔧 Repair of windings or collector: 3,500–6,000 ₽ (often cheaper to buy a new starter).
• 🔧 Complete replacement of the starter: from 5,000 ₽ (budget models) to 20,000 ₽ (premium, for example, Bosch for Mercedes).

Average starter life - 100,000–150,000 km. On vehicles with the system Start-Stop resource is reduced to 80,000 km.

Is it possible to repair the starter yourself?

Yes, if the fault is:

• 🔹 Solenoid relay (replacement in 30 minutes).
• 🔹 Brushes or commutator (you need a soldering iron and a set of brushes).
• 🔹 Bendix (requires snap ring remover).

Difficulties arise when:

• 🔹 Interturn closure (windings need to be rewinded).
• 🔹 Bearing wear (requires a press to press in).

For repair you will need:

• 🔧 Set of screwdrivers and keys.
• 🔧 Soldering iron (for replacing brushes).
• 🔧 Retaining ring remover.
• 🔧 WD-40 or equivalent for cleaning parts.

Which starters are considered the most reliable?

According to the study ADAC (2023), the best starter manufacturers:

1. Bosch - resource up to 200,000 km, suitable for VW, Audi, BMW.
2. Valeo - optimal for Renault, Peugeot, Citroen.
3. Denso — reliability at the OEM level for Toyota, Lexus, Subaru.
4. Mando - budget option for Hyundai, Kia.

Of the Russian brands that have proven themselves well KZATE (Kaluga) and StartVOLT — their starters are 30–40% cheaper than imported ones, but their service life is lower (up to 100,000 km).