Why Mitsubishi Lancer 9 won't start: complete diagnostics and repair

Mitsubishi Lancer IX (2003-2008) is a reliable car, but even it is not immune to starting problems. If your Lancer 9 won't start, the reasons may lie in the electrics, fuel system, mechanics, or even a simple driver error. In this article we will look at all possible malfunctions - from a discharged battery to a broken immobilizer, - and we will also give step by step instructions for diagnostics and repair.

Feature Lancera 9 — sensitivity to the quality of fuel and electronics. For example, on models with a 4G18 engine, the fuel pump relay often fails, and on 4G63, the crankshaft sensor often fails. We will not be scattered with general advice, but will concentrate on specific steps, which will help bring the car back to life. If you are not an expert, after reading this you will be able to at least understand whether it is worth calling a tow truck or whether the problem can be solved on the spot.

1. Checking the battery: the first signs of discharge

Let's start with the most obvious - battery. On Lancere 9 even a slightly discharged battery can block starting due to sensitivity ECU (electronic control unit). Signs of discharge:

• 🔋 When you turn the key you can hear relay clicks, but the starter does not turn.
• 💡 Dashboard dimly lit or goes out when trying to start.
• 🚗 Car does not respond to central locking or alarm.

How to check:

1. Turn on the headlights. If they light dimly or flash, the battery is low.
2. Try it "light a cigarette" from another car. If after this Lancer starts - the problem is in the battery.
3. Measure the voltage with a multimeter: 12.6 V - the norm, 11.5–12 V - charging required, below 11 V - deep discharge.

If the battery is new but discharges quickly, check:

• 🔌 Leakage current (norm - up to 50 mA, if more, look for an energy “eater”).
• 🔄 Generator: When the engine is running, the voltage at the terminals should be 13.8–14.5 V.

2. Starter: why doesn’t it turn or click?

If you hear when you turn the key single clicks or starter doesn't rotate at all, the problem may be:

How to check the starter for Lancere 9:

1. Remove alarm chip (if any) - sometimes it blocks the launch.
2. Check starter fuse (No. 30 on 10 A in the block under the hood).
3. Serve +12 V directly to the solenoid relay (thin wire). If the starter spins, the problem is in the control circuit.

⚠️ Attention: On Lancere 9 with Automatic transmission the starter will not operate if the selector lever is not in position P or N. Check selector lever position sensor!

Checking fuse No. 30 (10 A)

Solenoid voltage test

Checking the mass on the starter housing

Bendix inspection for wear -->

3. Immobilizer: why Lancer 9 does not see the key

One of the most insidious problems — immobilizer failure. On Lancere 9 it often blocks startup due to:

• 🔑 Discharged key (battery inside CR2032).
• 📶 Alarm interference or other electronic devices.
• 🔧 Oxidized contacts in the immobilizer block (located under the dashboard, to the left of the steering wheel).

How to bypass the immobilizer in emergency mode:

1. Insert the key into the ignition and turn to position ON (don't start it!).
2. Wait 10–15 minutes — sometimes the system “recognizes” the key after a reboot.
3. If the dashboard flashes red key, try spare key.

If all else fails, check:

• 🔌 Immobilizer fuse (No. 15 on 10 A in the cabin block).
• 📡 Immobilizer antenna around the ignition switch (the connector often comes off).

⚠️ Attention: Do not try to disable the immobilizer directly - this may block ECU. On Lancere 9 Reset required dealer equipment or block firmware.

4. Fuel system: no gasoline or pressure

If the starter turns, but the engine doesn't grasp, the problem may be in the fuel system. On Lancere 9 Most often they fail:

• ⛽ Gasoline pump (located in the tank, resource - 150–200 thousand km).
• 🔧 Fuel pump relay (in the interior fuse box, No. 23).
• 📉 Fuel pressure sensor (on the ramp, norm - 2.5–3.5 bar).

How to check:

1. When you turn on the ignition you should hear buzzing sound fuel pump (2–3 seconds). If not, check the fuse and relay.
2. Remove fuel hose from the ramp and check the pressure with a pressure gauge. If there is no pressure, the pump or filter is clogged.
3. Check fuel filter (located under the tank, resource - 30-50 thousand km).

If the fuel pump is running but no fuel is flowing:

• 🔍 Check it out coarse filter mesh (inside the tank, often clogged with dirt).
• 🔧 Take a look fuel lines for kinks or cracks.

5. Sensors and electronics: errors that block startup

Modern engines Lancera 9 (4G18, 4G63, 4G94) are equipped with many sensors, and even one malfunction may block startup. The most problematic:

How to diagnose:

1. Connect OBD-II scanner (for example, ELM327) and check for errors. On Lancere 9 common codes:
   • P0335 — crankshaft sensor;
   • P0340 — camshaft sensor;
   • P0171 - lean mixture (maybe due to MAF).

⚠️ Attention: On Lancere 9 with HBO oxygen sensor (Lambda) may produce false errors. If the engine starts on gasoline, but does not switch to gas, check lambda probe emulator.

6. Mechanical faults: timing belt, marks, compression

If all previous checks have failed, the problem may be engine mechanics. On Lancere 9 most often found:

• 🔗 Broken timing belt (on 4G18 and 4G63 this leads to bending of the valves!).
• 🔧 Broken timing marks (after replacing the belt or chain).
• 📉 Low compression (wear of piston rings or valves).

How to check:

1. Timing belt:
   • Remove the top timing cover and inspect the belt for cracks.
   • If the belt is broken - don't try to start (risk of engine damage!).
2. Timing marks:
   • Align the crankshaft and camshaft to the marks (on the pulleys and cylinder block).
   • On 4G63 The crankshaft mark must match the mark on the oil pump.

1. Remove the belt.
2. Rotate the crankshaft until the mark on the pulley aligns with the mark on the block.
3. Make sure that the mark on the camshaft is facing up (on 4G18 - this is 12 hours).
4. Install the belt, tension it with a roller (deflection no more than 5 mm).