Mitsubishi S12A2 troubleshooting: 12 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Mitsubishi S12A2 — full specs, parts & maintenance.
| Code | Meaning |
|---|---|
| d | Excessive blowby through breather due to worn cylinder liners, pistons, etc. |
| A | A |
| GAIN | GAIN |
| D | D |
| I | I |
| Symptom | Cause | Remedy |
|---|---|---|
| Battery discharged | Check alternator (2D . drive belt, Consult your Mitsubishi dealer, Recharge, Change. | |
| Starter will crank engine, but engine will not start. | Fuel system issues | Refuel, Check connection, Fuel pipe defective (Bad quality fuel) > Change fuel. Air in fuel system > Prime. Consult your Mitsubishi dealer. Fuel filter clogged > Clean or repair. Fuel pipe restricted or leaky > Clean or repair. Fuel feed pump defective > Consult your Mitsubishi dealer. Air & EArAustoy systems Air cleaner clogged > Clean element. Fuel injection pump detective > Consult your Mitsubishi dealer. |
| Air motor will not run. | Low air pressure, Defective starter switch, Defective magnetic valve broken connections | Operate the compressor to increase the pressure in the air tank. Repair broken wires. Consult your Mitsubishi dealer. |
| Air motor runs, but pinion gear will not be engaged with ring gear. | Damaged ring gear or pinion gear | Consult your Mitsubishi dealer. |
| Pinion gear is engaged with ring gear, but ring gear will not rotate. | Low air pressure | Run the compressor to increase the pressure in the air tank. |
| Engine lacks power. | Oil viscosity incorrect, Bad quality fuel, Insufficient air (air cleaner element clogged), Radiator overcooled | Change oil. Change fuel. Clean or change. Use radiator cover or consult your Mitsubishi dealer. |
| Engine overheats. | Radiator and/or heat exchanger dirty, V-belts too loose, Not enough coolant in cooling system, Water pump defective, Thermostat defective | Clean heat exchanger or consult your Mitsubishi dealer. Readjust. Refill. Consult your Mitsubishi dealer. Consult your Mitsubishi dealer. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Fuel system issues. See the table for the matching fixes.
Documented causes: Low air pressure, Defective starter switch, Defective magnetic valve broken connections. See the table for the matching fixes.
Documented causes: Damaged ring gear or pinion gear. See the table for the matching fixes.