| 1 | Injector stop | Cut off No. 1 injector | Engine: After warm-up, idle operation (Cut off injectors sequentially to check for a cylinder that does not change engine in idle status) | Engine is changed (becomes unstable or stalled) |
| Cut off No. 2 injector |
| Cut off No. 3 injector |
| Cut off No. 4 injector |
| 2 | Fuel pump ON | Drive fuel pump to circulate fuel | - Ignition switch: ON
- Check for pump operating noise near fuel tank
| Operating noise audible |
| 3 | Fuel pump OFF | Stop driving the fuel pump and stop fuel circulation | - Ignition switch: ON
- Check for pump operating noise near fuel tank
| Operating sound cannot be heard. |
| 4 | Purge control solenoid valve ON | Switch solenoid valve from OFF to ON | Ignition switch: ON | When the valve is actuated, operating noise is audible |
| 5 | Purge control solenoid valve OFF | Switch solenoid valve from ON to OFF | Ignition switch: ON | When the valve is actuated, operating sound cannot be heard. |
| 7 | Cooling fan ON | Actuate the fan motor | Ignition switch: ON | Fan motor rotates at high speed |
| 8 | Cooling fan OFF | Stop the rotation of the fan motor | Ignition switch: ON | Fan motor with a high speed stops |
| 11 | A/C compressor relay ON | Switch the A/C compressor relay from OFF to ON | Ignition switch: ON | The operating sound of A/C compressor is audible |
| 12 | A/C compressor relay OFF | Switch the A/C compressor relay from ON to OFF | Ignition switch: ON | Operating sound of the A/C compressor cannot be heard |
| 13 | Oil feeder control valve ON | Switch the inlet oil feeder control valve and exhaust oil feeder control valve from OFF to ON | Ignition switch: ON | When the valve is actuated, operating noise is audible |
| 14 | Oil feeder control valve OFF | Switch the inlet oil feeder control valve and exhaust oil feeder control valve from ON to OFF | Ignition switch: ON | Operating sound cannot be heard. |