The situation when your Mitsubishi Pajero 3 refuses to start, always takes you by surprise, especially if you need the car urgently. The Japanese SUV is renowned for its reliability, but age has taken its toll and the electrical circuits or fuel system can throw up some surprises. The owner is faced with silence in response to turning the key or a dull click, which requires an immediate but cool analysis of the situation.
Before you panic or call a tow truck, it is necessary to conduct a primary diagnosis, which often allows you to identify trivial causes. Battery is the first suspect, especially in the cold season. However, the problem may be hidden deeper: in the immobilizer, crankshaft position sensors, or even in a simple lack of fuel in the tank due to a faulty level sensor.
In this article, we will examine in detail the main engine failure scenarios, based on operating experience of the V73 and V77 models. You will learn how to distinguish the problem with starter from a fuel pump malfunction and what to do if the security indicator lights up. A competent approach will help save time and money by returning your SUV to service without unnecessary replacement of expensive components.
Electrical and battery diagnostics
If when you turn the key in the ignition you do not hear any sounds or you only hear the relay clicking, the first thing you need to pay attention to is battery charge. On Pajero 3 Electronics are very sensitive to voltage drops. Dimly burning lamps on the dashboard or their complete absence when trying to start indicate a deep discharge or oxidation of the terminals.
Check the tightness of the terminals: even the slightest loosening of the contact can lead to loss of starting currents necessary to crank a powerful diesel or gasoline engine. Oxides on the contacts create high resistance, which “strangles” the starter. Cleaning the contacts and checking the ground on the body often solves the problem of sudden inoperability.
⚠️ Attention: If you use a starting device (booster), make sure that it is designed for the starting currents of your engine. A weak booster may not start the engine, but it can “kill” the electronics of the control unit during power surges.
To accurately assess the condition of the battery, use a multimeter. A voltage below 11.5 Volts under starter load indicates the need for charging or replacement. battery. It is also worth checking the alternator belt: if it is slipping, the battery may not have been charged during the last trip.
Problems with the starter and starting circuit
When the battery is good, but the engine does not turn, attention switches to starter. The characteristic click of the solenoid relay without subsequent rotation of the rotor indicates sticking of the contacts inside the relay or wear of the brushes of the electric motor itself. On Pajero 3 The starter is located at the bottom of the engine, where it gets exposed to moisture and dirt, which accelerates corrosion.
Sometimes the problem lies not in the starter itself, but in the control circuit. The contact group of the ignition switch wears out over time, and the current simply does not reach the solenoid relay. You can try to close the contacts directly with a screwdriver (being extremely careful) to see if the starter is alive. If it turns briskly when it closes, look for an open in the lock or relay circuit.
- 🔋 Solenoid relay: often fails first, requiring contacts to be replaced or repaired.
- ⚙️ Bendix: If the starter spins with a squeal, but the engine stops, the Bendix overrunning clutch may be slipping.
- 🔌 Wiring: Check the integrity of the wires going to the starter for melting or breakage.
It is also important to mention the “nickels” inside the solenoid relay. With frequent starts, they burn out and the contact stops transmitting current to the starter windings. In some cases, a temporary solution helps - tapping on the relay body, but this is only a measure that allows you to get to the service center.
☑️ Checking the starter
Start blocking by immobilizer (Security)
One of the most common and specific problems Mitsubishi Pajero 3 is the start blocking by the security system. If the indicator on the dashboard is flashing Security or is constantly on, the engine will not start, even if the starter vigorously turns the crankshaft. The system does not recognize the chip key and blocks the supply of fuel or spark.
Often the cause is a low battery in the transponder key. The signal becomes too weak and the reading frame around the ignition switch cannot decode the code. Try placing the key close to the lock or using a spare key. If the spare one does not work, the unit may be out of sync. ETACS or the immobilizer itself.
⚠️ Attention: Do not try to “deceive” the immobilizer by installing various emulators without professional setup. This can lead to the car being completely locked and unable to start even with the original key.
There is an emergency start procedure if the battery is dead or the key is lost, but it requires a special PIN code (usually found on the plastic card in the documents) and performing a certain sequence of actions with the gas pedal and ignition. Without a code, it is almost impossible to start a car with a locked immobilizer.
Emergency start procedure (general diagram)
Insert the key and turn to the ON position. Press the gas pedal 5 times in 5 seconds. Press the brake pedal 6 times in 5 seconds. Turn the key to the OFF position, remove and reinsert. Press the gas 5 times, brake 6 times. The Security indicator will light up - wait until it goes out. After that you can start it.]
Fuel system: pump, filter and injectors
If the starter turns the engine confidently, but there are no flashes in the cylinders, the problem is most likely in the fuel. On Pajero 3 with a 3.2 DI-D diesel engine, the condition of the fuel filter and the absence of air in the system are critical. Gasoline versions are also sensitive to the pressure in the ramp, which creates fuel pump.
First of all, listen: when you turn on the ignition (before starting), you should hear the hum of a running pump from the gas tank area for 2-3 seconds. If there is silence, check the fuse and fuel pump relay. Often the relay oxidizes or “sticks,” especially in humid climates.
For diesel modifications, the problem of airing is relevant. If the filter has been changed a long time ago or water has entered the tank, the Common Rail system will not be able to create the necessary pressure. In this case, pumping the system through a manual booster pump (bulb), if provided by the design, or checking the return valves will help.
| Symptom | Probable Cause | Action |
|---|---|---|
| No pump hum | Blown fuse or relay | Replace fuse/relay |
| The engine seizes and stalls | Low fuel pressure | Check filter and pump |
| Black smoke on startup | Too much fuel / too little air | Check the air filter |
| Launch with ether only | The injection pump or injectors do not work | Fuel diagnostics |
In winter, keep the tank at least half full to avoid condensation, which can freeze in the fuel lines and block the diesel supply.
Sensors and electronics: impact on startup
Modern engine Pajero 3 is controlled electronically, and the failure of one of the sensors can completely paralyze the launch. The critical element is Crankshaft position sensor (CPS). If the ECU does not see the crankshaft rotation signal, it will not give the command for spark and fuel injection.
It is also worth paying attention to the camshaft position sensor. If it malfunctions, the engine may start with difficulty or stall immediately after starting. Often the problem is solved by cleaning the contacts or replacing the sensor, which could have failed due to overheating or vibration.
The engine control unit (ECU) itself should not be discounted. On older copies, the capacitors inside the ECU may dry out, which leads to unstable operation. In such cases, the car may behave unpredictably: it may start or not, depending on the heating or humidity.
- 📉 Mass air flow sensor (MAF): if heavily contaminated, it may give incorrect readings, interfering with mixture formation.
- 🌡️ Temperature sensor: if it “lies” and shows that the engine is hot, the ECU may not provide a rich mixture for a cold start.
- ⚡ Relay main: The main power relay of the ECU often fails, cutting off power to the brain when the key is turned.
Mechanical reasons and compression
In rare but possible cases, the problem lies in the mechanical part. For diesel Pajero 3 With high mileage, wear and tear of the injection pump plunger pairs or a drop in compression are typical. Without sufficient compression pressure and temperature, diesel fuel simply will not ignite.
Checking compression is a mandatory step if all other systems are working properly. Low compression can be caused by worn piston rings, burnt valves or, in the worst case, a broken timing belt. On 3.5 GDI gasoline engines, compression and serviceability of the direct injection system are also critical.
⚠️ Attention: If you hear an uncharacteristic metallic knock or ringing sound when cranking the starter, stop trying to start immediately. This may indicate that the valves meet the pistons after the timing belt breaks.
Also check the condition of the air filter. If it is completely clogged with dust or snow, the engine will “suffocate” and will not be able to start. A visual inspection of the engine compartment sometimes helps to find pinched pipes or traces of rodents that might have chewed on the wiring.
Comprehensive diagnostics should start with the simple (battery, fuses) and move on to the complex (compression, ECU) to avoid unnecessary costs.
Frequently asked questions (FAQ)
Why does Pajero 3 stall immediately after starting?
Most often this is due to a malfunction of the idle air control, unaccounted air leaks, or a problem with the immobilizer, which blocks the engine a second after starting. It's also worth checking the throttle position sensor.
What to do if the battery is dead and the key does not open the door?
In the doorknob Pajero 3 There is a hidden mechanical key hole. Remove the decorative cap at the end of the handle, insert the key and turn. If the lock is sour, use WD-40. After opening the doors and connecting power, the immobilizer may require time to synchronize.
Is it possible to start Pajero 3 from a pusher?
Petrol versions with automatic transmission cannot be started from a pusher. Diesel engines with a manual transmission are theoretically possible, but due to the high pressure in the cylinders and the features of the injection pump, this is extremely difficult and risky for the mechanism. It is better to use a booster or charger.
Where is the Main Relay located on Pajero 3?
The main relay is usually located in the engine compartment, in a black plastic fuse and relay box that is mounted on the mudguard or body wall. It is often labeled "ENGINE" or "MAIN". Check its integrity and contacts.