Jetta engine reported P0501 speed signal 1 unreliable signal, running and running, and it was diffic

If the Electronic Control Unit (ECU) detects that the actual speed is too different from the estimated speed based on other inputsThe fault code will appear. Causes of failure include VSS sensor circuit or connector failure, VSS sensor failure, VSS mechanical connection failure, electronic control module (PCM or ECM) failure, etc. The engine cooling fan is opened and closed, as well as other functions such as cruise control.

Car owners need to master the skills of using the car:

1. Smooth driving: Automatic transmission cars should not deliberately emphasize the speed of speed.

2. Upshift in advance: If you jump late when driving an automatic car, don't step on the accelerator sharply, which will only get the opposite effect.

3. Correct operation: step on the brake when starting, put the gear lever into the driving gear, and wait for a second to feel a slight vibration of the body before starting.

Check the left front wheel speed sensor for abnormalities

How did you solve your problem? That's what happened now, too.

Can I start it after the ignition is turned off?

Is my eldest brother's car repaired, and can mine tell me what the problem is?

Summary. Hello, the engine of the vehicle stalls irregularly. The relevant reasons are as follows, first, the phenomenon caused by the insufficient oil pressure of the vehicle gasoline pump, this is the need to detect the oil pressure of the gasoline pump, if there is a problem or the pressure of the oil pump is unstable, the gasoline pump needs to be replaced in time.

Second, this phenomenon caused by low idle speed of the vehicle engine, it is recommended to clean up the carbon deposits inside the throttle and engine, and then rematch the throttle.

Third, the crankshaft position sensor has a problem caused by this fault performance, this is the need to use a computer to read the fault of the crankshaft position sensor**, if there is a fault, you need to replace the new crankshaft position sensor.

Fourth, check whether the engine of the vehicle is high, if the engine is high, it is easy to cause the phenomenon of stalling, then it is necessary to check whether the relevant sensors or fans are rotating normally.

Fifth, the phenomenon caused by the virtual connection or damage of the relay related to the vehicle engine, this is the key to check whether there is a problem with the main relay.

The Jetta engine stalls irregularly.

Hello, this question can give you a perfect reply, wait for me to sort out the information, I'm typing, 2-3 minutes, don't finish.

Hello, the engine of the vehicle stalls irregularly. The relevant reasons are as follows, first, the phenomenon caused by the insufficient oil pressure of the vehicle gasoline pump, this is the need to detect the oil pressure of the gasoline pump, if there is a problem or the pressure of the oil pump is unstable, the gasoline pump needs to be replaced in time. Second, this phenomenon caused by low idle speed of the vehicle engine, it is recommended to clean up the carbon deposits inside the throttle and engine, and then rematch the throttle.

Third, the fault performance caused by the problem of the crankshaft position sensor of the excitation bridge, this is the fault of the crankshaft position sensor that needs to be read by the computer**, if there is a fault, the crankshaft position sensor needs to be replaced with a new one. Fourth, check whether the vehicle engine has high temperature, if the engine is high, it is easy to cause the phenomenon of stalling, then this is the need to check the relevant sensor or the fan is laughing and collapsing and not rotating normally. Fifth, the phenomenon caused by the virtual connection or damage of the relay related to the vehicle engine, this is the key to check whether there is a problem with the main relay.

Even when you run, you turn off the fire, and sometimes when you are idling, it will also turn off the fire.

Jetta '08.

Can I start it immediately after turning off the ignition?

Summary. The sensor mainly transmits engine speed information, if it is broken, there will be no idling, and the engine will not start without idling.

May I ask what happens when the 13 Jetta is not good to start, and the engine fault code P065200 sensor reference voltage B circuit is low? Fault codes can't be eliminated.

The sensor mainly transmits engine speed information, if it is broken, there will be no idling, and the engine will not start without idling.

Crankshaft position sensor.

The engine is shaking.

Engine shake is unstable idling, throttle check is not?

The throttle valve has just been cleaned.

The terminal resistance inside the ABS control unit is unstable, which can also lead to abnormal communication in the engine control unit, and eventually lead to failure to start or unstable idling.

The main reasons for the inability of control units to communicate with each other are: positive open circuit short circuit; Ground Break Short Circuit; CAN bus short circuit open circuit. Consult the relevant circuit diagram and check the various control units connected to the drive bus CAN of the car respectively

Engine control unit, ABS control unit, instrument control unit. The results of the positive electrode and grounding are normal. After disconnecting the engine control unit, ABS control unit and instrument control unit, check that there is no short circuit or open circuit in the drive CAN bus.

When only the engine control unit and the instrument control unit are connected, and then the data in the engine control unit is read, it is displayed as shown in Figure 5, and the engine control unit can communicate with the instrument control unit. Therefore, the anti-theft system was matched, and it was found that the engine control unit and the instrument anti-theft control unit could not be matched normally. After replacing the new instrument control unit, the instrument control unit and the engine control unit can be matched normally, when the key is matched, the key cannot be matched with the anti-theft system.

Due to the unstable internal terminal resistance of the ABS control unit, the engine control unit cannot communicate normally, and eventually it cannot be started. Due to the blind matching of the anti-theft system by the repair shop outside, the control unit of the instrument anti-theft system was disassembled, resulting in damage to the instrument. The key replacement is due to the fact that the car uses data from other cars.

From the analysis of the entire repair process, the initial failure may only be a damage to the ABS control unit.

Yesterday the car couldn't hit, today the car can stop, and now the engine of the car is shaking.

Engine shake or unstable idling, voltage problems.

The fault code of the new Jetta P035100 belongs to the fault code of the power supply system, which generally only appears in the case of power failure, heat dissipation and abnormal fan.

Jetta Fault **P336200:

Cylinder 1 detects a static fault for lack of fire.

Jetta fault **002e18:

Carbon deposits can cause gasoline to burn inadequately, causing the engine to shake. The impact of carbon deposits on a car is considerable. One is that the engine power is reduced, that is, the power output is uneven and gradually decayed, in other words, it is more and more weak.

The second is to increase fuel consumption and increase the economic burden. Third, it is difficult to start cold, that is, it is difficult to ignite, and it is not easy to get on the car. Finally, if the carbon deposition in the combustion chamber is too heavy, it will also cause the cylinder to be cleared, and the noise will be emitted at low speed, which will cause damage to the piston and crankshaft, resulting in high engine temperature, which will seriously affect the safety of the car.

Then there is the excessive discharge, which not only fails the annual inspection, but also directly aggravates the harm of environmental pollution.

Millions of car purchase subsidies.

Summary. Hello, I have seen your inquiry, please wait for a moment and answer it for you immediately.

**Jetta reports fault code P020400

Hello, I have seen your inquiry, please wait for a moment and answer it for you immediately.

Is this a fault on this car?

Hello, according to the analysis of the fault ** reported by your car, this situation is generally a problem with the fuel injector itself, you can check whether the pulse signal voltage from the fuel injector to the engine computer board is appropriate, and connect a diode test light to detect.

If the diode can be lit up, it means that the voltage is fine, and if it can't be lit, it is a problem with the engine computer board.

At present, the actual problem of the car is that it cannot accelerate with idle speed, jitter, etc.?

The analysis of the Yuanzheng GOLO car networking box is as follows:

P0301: Cylinder 1 misfired.

Repair suggestions:1Working Range Parameters:

Spark plug clearance: standard: mm, new spark plug (benchmark) mm; Spark plug resistance [25°C]:.

Ignition coil resistance value: resistance between the left terminal and the right terminal: 0 ohm is abnormal (ohm is normal); Resistance between the middle terminal and the right terminal:

0 ohm is abnormal (ohm is normal); Resistance between the left and middle terminals: or 0ohm is not normal (normal within a few kilometers).

2.Possible causes:

a).The CKP sensor is faulty.

b).The CMP sensor is faulty.

c).Ignition coil failure.

d).Ignition system failure.

e).The MAF sensor is contaminated.

f).Excessive air is sucked in the air intake system (between the MAF sensor and the intake manifold).

g).Fuel pump failure.

h).Failure of the fuel pressure regulator (built-in fuel pump assembly).

i).Fuel lines are blocked.

j).The fuel filter is blocked.

k).Fuel leaks in fuel lines.

l).Fuel spills.

m).Fuel is of poor quality.

n).The cleaning solenoid valve is faulty.

o).PCV valve failure.

p).The EGR valve is faulty.

q).The vacuum hose is damaged or improperly connected.

r).About connector and terminal failures.

s).Failure of the relevant wiring harness.

t).Not enough compression.

u).Improper variable valve timing control system.

3.Maintenance method:

a).According to collimation (spark plug clearance: standard:

mm, new spark plug (benchmark) mm; Spark plug resistance [25°C]:. Ignition coil resistance value: resistance between the left terminal and the right terminal:

0 ohm is abnormal (ohm is normal); Resistance between the middle terminal and the right terminal: 0 ohm is not normal (ohm is normal); Resistance between the left and middle terminals: or 0ohm is not normal (normal within a few kilometers).

Inspect the spark plug and ignition coil separately, and replace or continue the test below according to the results.

b).Check the status of the current input signal (ignition key on idle); Whether the CMP sensor is normal; Whether the CKP sensor is loose; Spark test, whether strong blue sparks are seen in each cylinder; over-aspiration in the air intake system; whether the pressure of the fuel line is normal; Whether there is a fuel leak in the fuel line; whether the engine compression is normal; whether the cleaning solenoid valve is normal; whether the PCV valve is operating normally; whether the operation of the EGR valve is normal; whether the engine coolant path is well sealed; After the above detection is completed, if there are still such fault codes, replace the PCM.

The reasons for this are roughly as follows:

There was a leak in the air intake system, causing the engine control unit to detect the problem and turn on the EPC warning light. Leaks in the crankcase ventilation system can also cause this failure. Serious or obvious vacuum leakage is not a problem, only a slight leakage, the control unit can not be effectively detected, the compensation adjustment carried out by the control unit exceeds the limit allowed by the internal program of the control unit, the control unit will judge that there is a problem with the electronic throttle system, and the EPC fault light is lit.

However, the actual reason for the EPC light to turn on in this process is not caused by the functional problem of the electronic throttle control system itself.

Check the electronic throttle body, find that the throttle is too dirty, clean the throttle, and then make the basic settings. Problems in the various components or circuits of the engine's electronic throttle system can generally be found through traditional electrical testing. The only thing to note is that the brake switch is an important part of the entire electronic throttle control system, don't neglect the check of the brake switch.

There is also oil to be filled in strict accordance with the standard, too much oil will affect the concentration of the mixture, resulting in the abnormal lighting of EPC; Cylinder compression pressure is too low, which can also lead to such failures.

If there is no problem with the above checks, you can solve the problem of the light on in the following ways:

Refresh the engine control unit: change 4837 or 4449 (manual) to 6512; Replace 4838 or 4378 (automatic) with 6513

The gear gap is small, there is a problem with the clutch, there is also a problem with the throttle, the fault light is on the line problem, and it will be done for dozens of dollars to go to the store to repair it, which is not a big deal.