Code No. P0093: Fuel Leak Problem

Battery power is supplied from the engine-ECU (terminal No. 17) to the suction control valve (terminal No. 1).
The engine-ECU (terminal No. 37) turns on the power transistor to flow current to the suction control valve (terminal No. 2).

The engine-ECU monitors the signals input from the rail pressure sensor.
The engine-ECU controls the suction control valve so that necessary fuel pressure can be obtained before fuel injection.
The engine-ECU compares the fuel pressure immediately before fuel injection and the fuel pressure after injection to check whether. The pressure drop greatly exceeds the expected range determined based on fuel consumption. The engine-ECU detects fuel leaks in this way

Check Conditions

Battery positive voltage is 8 - 16 V
2 seconds later after the ignition switch has been in "ON" position or the engine has started up
The engine speed is 600 r/min or more
Rail pressure sensor is normal

Judgment Criterion

The fuel discharge rate of the supply pump continues to exceed its threshold value against the fuel injection rate.

DIAGNOSTIC PROCEDURE

	Inspection chart for diagnosis codes (Refer to ).

	Go to Step 2.

	Go to Step 3.

	Replace the parts of an abnormal location.

After releasing the air from the fuel line, continue idle operation for about five minutes and recheck for abnormal symptoms.

	Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

	Go to Step 4.

After replacing the common rail assembly and fuel injection tubes, re-check the trouble symptoms.

	Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

	The check is end.