Audi A4 B8 can Crank But Won’t Start – DTC P304400

Audi A4 B8 can Crank But Won’t Start – The Audi A4 is one of the most widely circulated Audi cars in the world. This is a luxury sedan with a high-performance engine. Which makes the Audi A4 one of the most popular European cars in the world.

At this time mech4caras will discuss one of the cases that often occurs in the Audi A4 B8. But actually, this is also often the case with other types of Audi. The problem is that there is a problem with the Audi A4 engine cranking but the engine won’t start. There are many causes of engine conditions like this, but mech4cars will share according to the experience we have. Here’s the full discussion.

Read more: Metaverse Automotive in Audi and McLaren

Table of Contents

Audi A4 B8 can Crank But Won’t Start

Audi A4 B8 can Crank But Won't Start
The picture shows an Audi A4 B8 engine. This is the fourth generation of the Audi A4 which was born in 2008. Although it is quite old, this car is still the part that gets the most attention from Audi fans in the world.

To understand the problem of the Audi A4 B8 that wants to crank but can’t start we need to understand the conditions for an engine to start. This is a basic concept that all car lovers should have. Terms of the engine can be lit, especially on a gasoline engine is the presence of fuel, air, fire, timing, and compression. If one of these conditions is not met then the engine cannot start. Whatever the type of gasoline car, these conditions are absolute and so include the Audi A4 B8.

In this case, the Audi A4 B8 engine cannot start even though the starter motor can rotate the engine properly. We try to do an analysis and check for this problem. After going through the inspection, we find that the fuel pump on the car is not working. This means that this is what causes fuel not to be supplied to the engine. And the effect of course the car engine can not be started.

Based on this basic analysis we will focus on checking the fuel system. Audi A4 B8 is a modern car that uses an electrical system with many control modules. Therefore, to make the analysis faster and more accurate, you must use a scanner. The goal is clear that this is to see the fault DTC stored in the ECM as a basis for analysis in the next stage. After we did a scan using Thinkdiag, we found out that there is a DTC P304400 Fuel Pump Short Circuit Active/Static. Based on the DTC, it means that there is a short circuit or short circuit in the fuel pump system. In this case, the damage leads to three possibilities, namely the fuel pump, fuel pump wiring, or fuel pump control unit.

Read more: DTC P0443 on Chevrolet Spin 1.5 and Check Engine Lights

Audi A4 B8 can Crank But Won't Start
The interior of the Audi A4 B8 looks very attractive. This is what makes sense, why this car is still a lot of people like it.

Troubleshooting for DTC P304400

After knowing the problem that occurs in the Audi A4 B8 that can crank but won’t turn on, we will next discuss steps to solve the problem. For the record, the following steps actually include doing a scan, but we don’t rewrite it in the following steps.

The first step

For the first step, we try to check the fuel pump’s electrical path. We are trying to find a leakage current or a short circuit in the fuel pump wiring. After we took measurements, we did not find a short circuit in the fuel pump wiring. From this, we can conclude that the electrical system for the fuel pump on the Audi A4 B8 is in good condition.

Audi A4 B8 can Crank But Won't Start
The position of the Audi A4 B8 fuel pump is at the bottom of the second row of seats. To reach it is not difficult. You simply open the back seat or the second row, and you can access the fuel pump easily. But to open it, you need to use the appropriate special service tools.

Second Step

After we have checked the electrical path and we conclude it is safe, we proceed to the second step. In this step, we check the fuel pump motor. You can do this step by jumping the fuel pump motor with a voltage of 12V. If after you do jumper the fuel pump, the fuel comes out of the fuel pump, then we can say the fuel pump motor is in normal condition. However, you can also check the pressure value of the fuel spray coming out of the pump. If the value is in accordance with the service manual, it means that the condition of the fuel pump is completely normal.

The last step

First, we have checked the fuel pump electrical line and it’s OK. Second, we have also checked the working of the fuel pump, and that is also OK. So, there’s only one more thing that we haven’t checked yet and that is at the same time our conclusion, namely the damage that occurred and none other than the fuel pump control unit. We checked the fuel pump control unit and we found fairly severe damage. This we can barely fix. Therefore, we replaced the fuel pump control unit with a new one. After we do the replacement, and we clear the error data with the scanner, the car is back in good condition.

Read more: Symptoms of Fuel Filter Damage and Its Functions

Conclusion – Audi A4 B8 can Crank But Won’t Start

In dealing with the problem of a car cranking but not starting, we must return to the basic concept of an engine running. Then which part do you suspect the most for you to choose to check? But for vehicles with modules in each system, then you can easily detect the damage by using a scanner. Then you go to the section that the scanner shows you regarding the problem.

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