Daewoo Matiz won't start: full diagnostics and do-it-yourself repairs

Daewoo Matiz — a compact and unpretentious car, but even it sometimes refuses to start. If your Matiz does not respond to the key, do not rush to panic: in 80% of cases the problem is solved without a service center. In this article we will analyze all possible reasons - from banal battery discharge to rare breakdowns immobilizer or ECU.

Feature Matiz (especially 2005–2015 models) - sensitivity to the quality of fuel and electronics. For example, error P0335 (faulty crankshaft position sensor) may prevent starting, although the engine is mechanically sound. We have compiled a checklist for quick diagnostics and added unique life hacks for Matiz with manual and automatic transmission.

Important: if the car does not start after battery replacement or terminal reset, the problem may lie in immobilizer training - few people know about this, but we will tell you in detail.

1. Discharged or faulty battery

The most common reason why Matiz won't start - dead battery. Even if the dashboard lights are on, there may not be enough voltage to crank the starter. The normal voltage at the terminals when the engine is off is 12.6–12.8 V. If less 12.2 V, the battery is 50% discharged and requires recharging.

How to check:

• 🔋 Turn on the headlights: if they burn dimly or go out when you try to start the car, the problem is in the battery.
• 🔊 Listen to the sound of the starter: clicks without scrolling or slow rotation is a sign of a discharge.
• 🔧 Measure the voltage with a multimeter at the terminals when trying to start (should be at least 9.5 V).

If the battery is low, try using another car. Important: on Matiz with ECU Siemens (installed on models before 2010) You cannot connect the “donor” while the engine is running - this can burn the electronic unit.

⚠️ Attention: If after “lighting” Matiz starts, but a day later it won’t start again - the problem is generator or leakage current. You can check for leakage by disconnecting the negative terminal and connecting a 12 V light bulb between the terminal and the wire - if it lights up, there is parasitic flow.

2. Problems with the starter

If you hear when you turn the key relay clicks, but the starter does not turn, or the rotation is accompanied by a grinding noise, the starter itself is to blame. B Matiz Most often worn out:

• 🔄 Bendix (overrunning clutch) - does not engage with the flywheel.
• 🔋 Brushes or commutator - wear leads to lack of contact.
• 🔗 Traction relay - does not supply voltage to the winding.

How to temporarily start a car if the starter sticks:

1. Put Matiz to neutral and turn on the ignition.
2. Push the car (an assistant is needed) or use a tow.
3. At a speed of 5–10 km/h, turn on 2nd gear and quickly release the clutch.

If the starter turns, but very slowly, check:

• 🔌 Condition of the battery terminals (oxidation increases resistance).
• 🔧 Mass on the body and engine - poor contact “eats” the voltage.

3. Malfunctions in the ignition system

If the starter turns, but the engine does not “catch”, the problem may be:

• 🔥 Spark plugs - are oily, worn or have incorrect clearance.
• 🔌 Ignition coil - on Matiz with engine 0.8 MPI often fails.
• 📶 High voltage wires — breakdown or breakage.

How to check:

1. Unscrew the spark plugs and inspect them. Normal electrode color - taupe. Black soot indicates a rich mixture, white soot indicates a poor mixture.
2. Check the spark: place the spark plug on the high-voltage wire, apply it to ground and crank the starter. If there is no spark, the problem is in the coil or wires.

On Matiz with ECU Bosch ME7.9.7 (installed on models after 2010) The ignition coil driver often burns out in the control unit. In this case, the engine may “triple” or not start at all, but the indicator light will light up Check Engine.

⚠️ Attention: If after replacing the spark plugs or coil Matiz still won't start, check crankshaft position sensor (CPS). On Matiz it often fails after washing the engine or getting wet.

Symptom	Probable Cause	Verification method
The starter turns, but the engine does not start	Faulty spark plugs or ignition coil	Checking spark, replacing spark plugs
The engine “suffices”, but stalls	Problems with the fuel pump or DPKV	Listen to the operation of the pump, diagnostics with a scanner
Clicks under the hood, but the starter does not turn	Starter traction relay is faulty	Direct circuit of the starter with a screwdriver
Starts only "from the pusher"	Bendix wear or DPKV malfunction	Replacing the bendix, checking the sensor with an ohmmeter

4. Problems with the fuel system

If the starter turns, there is a spark, but the engine does not start, check fuel supply. On Matiz Most often they fail:

• ⛽ Fuel pump — does not pump gasoline (can you hear it running when you turn on the ignition?).
• 🔧 Fuel pump relay - on models before 2008, contacts often burn out.
• 🔍 Fine filter - clogs after 20,000 km.
• 💉 Injectors — clogged with deposits (especially when using low-quality gasoline).

How to quickly check the fuel pump:

1. Remove the back seat and locate the fuel pump door.
2. Turn on the ignition (without starting the car) - the sound of the pump should be heard for 2-3 seconds.
3. If there is no sound, check the fuse F15 (15A) and relay K5 in the mounting block.

If the pump works but no fuel flows, check rail pressure. Norm for Matiz — 2.8–3.2 bar. To check, you will need a pressure gauge, which is connected to the fitting on the fuel rail (located next to the injectors).

How to check fuel rail pressure without a pressure gauge?

If you don't have a pressure gauge, you can temporarily disconnect the fuel line from the rail and put it in a plastic bottle. When you turn on the ignition, gasoline should spurt out in a strong stream (caution—risk of fire!).

5. Immobilizer and electronics

One of the most insidious reasons why Matiz won't start - immobilizer. On models with ECU Siemens SIMTEC 56.1 (2005–2010) the settings are often lost and the control unit does not “see” the key. Symptoms:

• 🔑 The immobilizer light on the device blinks or is constantly on.
• 🚗 The starter turns, but the engine does not start (no spark or fuel).
• 🔧 After replacing the battery or removing the terminals, the car “does not recognize” the key.

How to solve the problem:

1. Try it retrain keys:

   1. Insert the key into the ignition.
   2. Turn to ON position (do not start).
   3. Wait 10 minutes - the immobilizer light should go out.
   4. Turn off the ignition and repeat the procedure 2-3 times.

2. If it doesn't help, check immobilizer antenna (located around the ignition switch). Often the connector comes off or the tracks break.

On Matiz with ECU Bosch ME7.9.7 (after 2010) the immobilizer is integrated into the control unit. If the light is flashing 10 times in a row, this means there is a key communication error. In this case, only flashing will help ECU or replacing the chip in the key.

6. Sensors and ECU

Engine Matiz controlled by an electronic unit (ECU), which relies on sensor readings. If at least one of them produces incorrect data, the engine may not start. The most problematic sensors:

• 📊 Crankshaft position sensor (CPS) - If there is a malfunction, the engine will not start at all.
• 🌡️ Coolant temperature sensor (DTOZH) - if he “lies”, the ECU incorrectly calculates the composition of the mixture.
• 💨 Mass air flow sensor (MAF) — becomes clogged with dust, causing the engine to “choke.”

How to check DPKV:

1. Remove the sensor (located next to the flywheel).
2. Check the winding resistance with an ohmmeter - it should be 500–700 Ohm.
3. If there is no resistance or very different, the sensor is faulty.

On Matiz with ECU Siemens error occurs frequently P0340 (phase sensor malfunction). In this case, the engine can only start after several attempts or “hot”. The solution is to replace the sensor or update the firmware ECU.

⚠️ Attention: If after diagnostics the scanner shows an error P1602 (loss of connection with the immobilizer), do not try to reset it programmatically - this may block ECU completely. Contact an auto electrician for re-flashing.

7. Engine mechanical problems

If all electrical systems are in order, but Matiz stubbornly won't start, the problem may be mechanical:

• 🔗 Broken timing belt — the engine will not spin or will start with pops.
• 🔄 Rotating the liners - accompanied by a knocking sound in the engine.
• 🛢️ Jammed oil pump - will lead to a lack of oil pressure.

How to check the timing belt:

1. Remove the belt cover (it is plastic, secured with 3 bolts).
2. Inspect the belt for cracks, delamination or breakage.
3. Check the tension - the belt should bend no more than 5–7 mm when pressed.

If the belt breaks, don't try to start the car - on Matiz with engine 0.8 MPI this will cause the valves to bend. In this case, major repairs will be required.

If the engine knocks or the starter does not turn over, check:

• 🔧 Compression (norm - 10–12 bar in each cylinder).
• 🛢️ Oil pressure (on a hot engine there should be at least 1.5 bar at idle).

8. External factors: weather, fuel, human factor

Sometimes Matiz won’t start due to trivial reasons that are easy to forget:

• ❄️ frost - if the temperature is lower -20°C, the oil thickens, and the battery loses up to 50% of its capacity.
• ⛽ Bad gasoline — after refueling at a questionable gas station, the fuel may not “burn.”
• 🔑 Human factor — they forgot to press the clutch (on the manual), the immobilizer on the key fob is turned on, the alarm key fob is dead.

How to start Matiz in the cold:

1. Turn on the high beams for 10-15 seconds - this will warm up the battery a little.
2. Press the clutch pedal all the way (disconnects the gearbox and engine, reducing the load).
3. Try starting the car with short starts (3-5 seconds).

If you fill up with bad gasoline:

• 🔧 Drain the fuel from the tank and wash it.
• 🔥 Replace the fuel filter.
• 🔋 Pump the fuel system by turning on the ignition for 30 seconds (the pump circulates gasoline).

FAQ: Frequently asked questions about the launch of Daewoo Matiz

Matiz does not start after replacing the battery - what to do?

Most likely, the immobilizer settings have gone wrong. Try retraining the keys (instructions in the immobilizer section). If that doesn't help, check the fuse. F10 (10A) - he is responsible for memory ECU.

The starter turns, but the engine does not start. There is a spark, gasoline is flowing. What's the matter?

Check crankshaft position sensor (CPS) and compression in cylinders. If the DPKV is working properly and the compression is low (less than 8 bar), the piston rings may be worn out or the valve may be burnt out.

The Matiz starts and immediately stalls. What is the reason?

Typical reasons:

• 🔧 Defective Idle air regulator (IAC).
• 🌡️ Crowded injectors or throttle valve.
• 🛢️ Air leaking through a crack in intake manifold.

Start by cleaning the throttle and checking the IAC (located next to the throttle valve).

After washing the engine, the Matiz stopped starting. What to do?

Water could get into distributor (on models before 2008), ignition coil or sensor connectors. Dry the engine compartment with a hairdryer or leave the car with the hood open in the sun for 2-3 hours. Pay special attention DPKV - it is most vulnerable to moisture.

Matiz does not start with the key, but starts with the pusher. Why?

This is a sign of a problem starter (wear of bendix or brushes) or DPKV. When starting “from the pusher”, the engine is spun by an external force, and ECU receives a signal from the crankshaft sensor, which does not happen when the starter is running. Check the starter and DPKV.