Tanker Common Fault Analysis

First, engine deceleration and automatic flameout

When the engine is running, the accelerator pedal is released or the engine automatically shuts off when the vehicle is running. The fundamental reason is that the engine is not easily stabilized when the engine is not idling to idle, so the engine is immediately turned off. The specific reasons include the failure of the accelerator pedal; the crankshaft position sensor and the camshaft sensor signal are not synchronized; the fuel oil pressure is faulty; the control unit signal is incorrect; the injection timing is incorrect. Should focus on checking the value change from non-idle to idle.

Second, the lack of engine power or poor acceleration

The phenomenon of engine power shortage is basically normal when the engine is running without load, but the acceleration is slow when the load is running, and there is no power on the uphill. When the accelerator pedal is stepped on, it still feels that the power is not enough, and the speed is not changed and the maximum speed cannot be achieved. The phenomenon of poor engine acceleration is that the engine speed cannot be increased immediately after the accelerator pedal is depressed, there is a hysteresis phenomenon, or there is a slight fluctuation in the engine during acceleration.

Insufficiency of engine power and poor acceleration are caused by too high or too low oil pressure in the fuel system; poor injector fuel injection; sensor signal error; insufficient fuel injection quantity; Exhaust pipes are blocked.

Third, the engine can not start and start due to difficulties

There are many factors that cause the failure of electronically controlled diesel engines. Generally, they cannot be started (no initial combustion) and start-up is difficult. Its inspection and exclusion methods are as follows:

Check for fault codes. If any, check the contents of the fault code.

Check whether the engine can turn when starting.

1 When starting, the starter does not turn and should be checked according to the cause of the starting system failure. First check the storage condition of the battery and the pole connection and contact; if it is normal, check the starting circuit, fuse and ignition switch. If the starter rotates and the engine does not rotate at start-up, the starter and the engine are partially engaged.

2 When starting, the engine speed is normal, and the engine does not start. Check the fuel injection system and the intake system separately.

For an electronically controlled fuel injection engine, there is no need to step on the accelerator pedal when starting. If the accelerator pedal is fully depressed or the accelerator pedal is pressed repeatedly to increase the fuel supply when starting, the engine speed may increase instantaneously, resulting in an increase in fuel consumption of the engine.

The accelerator pedal wiring harness is disengaged so that the engine can enter idling operation. This indicates that the fault is a failure of the accelerator pedal.

Visual inspection: Check the air intake pipe for leaks.

Check the oil line: Check the connection status of the tubing, the phenomenon of air intake and the quality of the fuel.

Harness check: Whether there is looseness in the connection status of the harness or the phenomenon of loose connection.

Sensor inspection: Check for sensor failure, loose or broken lines, and synchronization of the crankshaft and camshaft.

Check the injector for a control signal. If there is no control signal, check fuses, wiring, and ECU. If there is a control signal, check the injector spray condition is normal.