Volkswagen instrument reported "EPC" fault light, and the engine was not filled with oil. Let's see how Pang Ge fixes it.

Vehicle information: Jetta with a displacement of 20 10 1.6, and the driving distance is about 1 10000 km.

Vehicle failure: the instrument reported EPC failure, and the engine reacted slowly when stepping on the accelerator when the light was on, feeling a little unable to add oil. After the flameout, the restart fault disappears, and the idle state does not report the fault. The EPC light lights up immediately after stepping on the accelerator deeply.

Check steps:

Reading a fault with a computer is an unreliable signal of the accelerator or pedal sensor. Brother Pang initially judged that the throttle was dirty, and the fault still existed after cleaning. Next, Fat Brother will check the accelerator pedal position sensor.

Remove the accelerator pedal.

The plug control is a 6-wire system, and Pongo found traces of green oxidation on the second pin.

So is the second pin of the pedal. After polishing and cleaning, the failure of reloading test was not solved.

Brother Pang took the pedal apart and fiddled with it.

Four sliding resistance contacts, somewhat similar to the inside of the wiper motor. The principle is similar to that of carbon brushes for starters and generators.

The green box is marked with four sliding resistors, collectively called potentiometers, which can divide the voltage infinitely. Brother Pang found traces of water flowing at the green arrow mark, because this Jetta heater hose burst once last month, and Brother Pang suspected that there was water in it.

There are many oxides on the back of the circuit board.

I cleaned it and found that a copper wire was broken.

Just find two thin copper wires to connect.

Weld with an electric soldering iron.

Why did you weld two sets of wires? I can't help it Poor workmanship. The soldering iron is not strong enough to iron the other one. Finally, afraid of line interference, we dug both sides of the line below. After soldering, stick a piece of paper tape behind the circuit board to prevent the flying wire from vibrating and shifting.

Test run: step on the accelerator at will, the instrument is trouble-free and the fault is relieved.

Electronic throttle: six wires: two signal wires, two potentiometers for power supply and grounding. When the accelerator pedal is depressed, the potentiometer signal rises and falls one by one, and the computer receives this signal to control the accelerator motor to rotate at a certain angle to meet the air intake under various working conditions. If the signals go up one by one, but not down, the computer judges that there is something wrong with the accelerator pedal sensor.

Fat brother concluded: When you find that the epc indicator light is on, you can try to turn it off and then restart it to see if the epc indicator light is still on. If it doesn't light up, it means there is no problem, but the epc indicator light is affected and misreported; If the epc light is still on, or often on, it needs to be checked and repaired.

Welcome to inquire about the maintenance of used cars. Brother Pang will reply to you as soon as possible. Friends who like it can pay attention to it, and there will be more car knowledge to share with you later.