Error Code P0505 – Idle Air Control System Malfunction

How does a mechanic diagnose a P0505 code?

When diagnosing this error code, a mechanic will do the following:

• Reads all data and error codes stored on the ECM using an OBD-II scanner, clears the codes and checks if the P0505 again.
• Monitor the engine idle speed while in and out of gear to verify that the engine idle speed is within the manufacturer's specifications.
• Check the engine for vacuum leaks.
• Check the engine for carbon buildup on the throttle body and idle air control valve inlet.
• Disconnect and check the idle air control valve.
• Check to see if the idle air control valve passages are clogged.

How to check VAZ 2112 errors

There are 2 methods of troubleshooting on a car with an 8 and 16 liter engine - self-diagnosis and connecting with a third-party detector.

In the first option, you can look at the faults like this.

1. Get in the car.
2. Insert the key into the lock cylinder and do nothing else.
3. Hold down the daily mileage key and, without releasing it, turn on the ignition (do not start the engine).
4. Information about entering the service mode will light up on the device.
5. Press the module control key twice.
6. Count the errors that appear.

The second option involves connecting special equipment to the OBD2 port. Here the operation should be performed by specialists with experience in this field.

How serious is the P0505 code?

• P0505 code indicates that the idle air intake control valve is not operating properly, which can cause the engine to idle too low or too high. The engine may also stall when the car is stopped.
• If the Check Engine light comes on, the vehicle will not pass an emissions test.
• A vacuum leak can cause the engine to run rough. Reduced fuel efficiency may also occur.

Error codes VAZ 2112 8 and 16 valves on the instrument panel: decoding

In modern Lada models, a Euro shield is installed. There is an enlarged display here, where the main and secondary fault codes are displayed. On models 8 and 16 cells, the BC failure codes during self-diagnosis are identical, and the procedure for decoding them requires instructions. There are 9 direct ciphers in total. Codes can stack if there are two or more problems at the same time. If the tidy shows 21, this may mean there are problems No. 6, 7 and 8 at the same time.

If we talk about computer diagnostics, fault codes are deciphered according to a standard scheme that is relevant for all OBD2 variants.

Error 1 1

Says that a critical failure has been detected in the microprocessor system. Open the ECU module and perform a thorough diagnosis using special equipment. Simply cleaning or replacing damaged terminals often helps.

Error 2 on VAZ 2112

The actual on-board voltage differs from the set voltage. The problem may be a short circuit in the main wiring line or a critical discharge of the battery. Study the wiring and basic power components of the car.

Error 3

The fuel level sensor is damaged or not working properly. Check the condition of the float. The cause is a breakdown of the control wiring.

VAZ 2112: error 4

The code indicates that the DTOZH is out of order or is not functioning correctly. The problem should be resolved in the same way.

Error 5

The outdoor thermometer has failed. Check the sensor and its wiring.

Error 6

The code indicates overheating of the power plant. You need to stop immediately and wait for the engine to cool down.

Error 8 2112: 8 valves

Brake system malfunction. Troubleshooting begins with checking the brake fluid level and pad wear.

Error 9

The battery has gone into a deep discharge. Replace the module with a new one or charge the worn element.

Error 10: decryption

In the most common case, the code is a combination of problems 6 and 4. We are talking about a failure of the DTO and overheating of the motor. Problems should be resolved in parallel.

Error 12

Indicates a problem in the electrical circuit of the indicator on the device. Check the appropriate fuse and bulb.

Error 14

Increased signal from the DTOZh controller. There is a short circuit in the controller circuit.

2112 displays fault 18

It is a combination of errors 2, 9 and 7. Problems are resolved in the same way as individually.

Lada 2112 shows breakdown 26

A software glitch that combines three or more problems at the same time. To troubleshoot the problem, perform detailed network diagnostics.

Error 45

Similar solution to problems as in the above paragraph.

Error 34

Mass air flow sensor – low output signal level. The circuit may be damaged or the sensor may be faulty.

Code 78

A simple combination that the machine can use to represent problems 7 and 8 at the same time.

Error 89

Similar meaning and principle of education.

Error 210

Communication with the immobilizer is lost. Perform diagnostics of the wiring and contact groups of the module.

Malfunction P0102

A controller error indicates a low signal from the mass air flow sensor. There is an open circuit or the sensitive area of ​​the sensor is dirty.

P0123 - breakdown

Short circuit on TPS. The circuit is producing too high a signal. There is a short circuit in the circuit. Check the line carefully for damage.

P0131 - error

Lambda probe No. 1 – line damage.

Error 132

Same for DK2.

Breakdown 0134

DK1 wires are broken. Code P0134 indicates a complete loss of communication with the sensor.

Error P0171

The malfunction can be displayed as the number 171. The coding indicates the problem of the fuel mixture being too lean. Check the line for cracks, leaks and damage - air is being sucked into the system.

Lada 2112: error 0172

A similar problem P0172 indicates the opposite effect. Here the fuel mixture is too rich. At 172, you need to check the air filter and mass air flow sensor for functionality.

Error P0300

When code 0300 lights up on the diagnostic scanner, check the ignition system. The error indicates multiple misfires in the cylinders.

P0301 - breakdown

A similar problem with more precise location indication. A misfire was detected in the first cylinder. The repair sequence is identical to point 0300.

Code 0328

Excessively high signal level from the knock sensor. The reason was the filling of low-quality fuel or a physical malfunction in the ignition unit.

Code 0325

There are problems with the knock sensor. Inspect the sensor for damage and replace it with a new device if necessary.

0335 - error

Displayed as 335. There is a problem with the DPKV wiring. The lines are examined for oxides or mechanical damage.

Fault 0340

Likewise for DPRV. For code P0340, the repair steps are identical.

Code 0343

Phase sensor – excessively high signal.

0443 - code

The canister purge valve is faulty, check the unit for damage or mechanical failure.

Error 0505

Short circuit on the speed sensor. Check the entire line.

Fault 0507

Idle speed too high. Check the mixture formation and mixture supply control module.

Code 456

The evaporative emission control module is not functioning properly. Check systems for damage.

Error 603

The ECM is damaged or there is a software glitch. Take the car to an electronics technician. Self-repair will not be effective.

P1135 - error

Incorrect mixture formation in partial load mode. Run system diagnostics.

Error 1426

Code P0426 indicates a problem in the wiring of the canister purge valve.

Error P1513

The idle speed regulator is damaged - a break with a short to ground. The wires need to be insulated or replaced.

1514 - malfunction

The idle speed control is damaged or there is a short circuit.

Error 1602: 2112 16 valves

Indicates that the powertrain control controller is losing voltage. The car does not start well when cold and crashes while driving.

Error 3456

The system requires checking the fuel level sensor. The module is damaged or its wiring is broken.

RAM error 2112

Indicates that there is a problem with the external thermometer. The sensor cannot be repaired; it must be replaced with a known good one.

KB 2112 sensor synchronization error

Indicates that there is damage in the sensor line or a malfunction of the sensor. The wiring and element are fully checked.

Error: lean mixture

If this code lights up on the dashboard, the control unit has nothing to do with it. If the mixture is lean, perform diagnostics on the fuel lines. The trouble is caused by air leaks at the joints or pipes.

Error: Mixture too rich

A similar problem caused by an air line obstruction. Here the filter may become clogged, the mass air flow sensor may break, or air may be sucked into the system after the sensor.

Phase sensor error

Check the sensor for problems. Repair consists of replacing the entire module.

Knock sensor error

The cause of the breakdown and the corrective actions are completely similar to the point indicated above.

Oxygen sensor malfunction

The controller may fail due to filling with low-grade fuel or problems with the mixture formation system.

Camshaft sensor malfunction

The DPRV may malfunction after passing a puddle or too active washing. To fix the problem, just dry the device well.

Crankshaft sensor malfunction

Worn gear on the working part of the sensor. The sensor can only be replaced entirely with a fully functional one.

Speed ​​sensor malfunction

The DS on a car is reliable, but a problem can happen after driving along a broken road or crossing a ford - the sensor simply floods with water. If the diagnostics determines that there is a problem, the entire sensor must be replaced.

ECU malfunction

The module is diagnosed using special equipment. Experienced electronics engineers can resolder or repair the part, but in most cases, the unit is simply replaced with a new one.

Technical description and interpretation of error P0505

OBD II Trouble Code P0505 is defined as “Idle Air Control System Malfunction.” Set when the powertrain control module (PCM) is unable to maintain or control engine idle speed.

In most cases, the PCM will attempt to make adjustments to various systems such as fuel timing, ignition timing, injection pulse timing, and others. Trying to maintain a given idle speed. However, when this limit is reached, the PCM will set code P0505 and turn on the warning light.

Idle speed in gasoline engines is adjusted and controlled by the idle air control valve, which is usually located on the throttle body. The valve is driven by a stepper motor, which receives commands from the PCM based on information received from various sensors located on the engine.

As long as the throttle valve remains closed, idle speed and quality are controlled by the PCM through the idle air control valve.

For example, if the engine is started in sub-zero temperatures, the PCM commands the valve to allow less air to enter the engine. This allows you to enrich the fuel-air mixture and creates conditions for regulating idle speed in cold weather.

As the engine warms up and combustion becomes easier and more complete. The PCM commands the idle air control valve to increase the amount of air entering the engine in response to changing conditions.

If the load on the engine changes, for example, when some electrical consumers are turned on or off. The PCM adapts the signal voltage to the idle air control valve. To ensure that the idle speed remains stable and at the RPM specified by the manufacturer.

Note that the idle air control valve is closed by the PCM when the throttle valve is opened. This is done in order to prevent excess air from entering the engine.

Symptoms of malfunction

The main driver symptom of P0505 is the MIL (Malfunction Indicator Light). It is also called Check engine or simply “check light”.

They can also appear as:

1. The “Check engine” warning light on the control panel will light up (the code will be stored in memory as a malfunction).
2. Floating speed, as well as attempts to stall at idle.
3. Idle speed is higher or lower than normal.
4. The engine may stall if the idle speed is not maintained by pressing the accelerator pedal.

Depending on the symptoms, the severity of a P0505 code can range from moderate to severe. Therefore, it is recommended to resolve this issue as soon as possible.

How to fix the problem

After diagnosis, the problem should be repaired. When reading a signal, it is necessary to check the circuit and devices following it. The most accurate method is to replace the damaged part with a known good one (new). This will eliminate the possibility of incorrect repairs. If the device is in working condition, the lines are checked; usually a primitive test is sufficient. However, if the control unit or relay fails, you will need a special tester and the ability to use it.

Separately, it is necessary to take into account that factory terminals and blocks become loose and oxidize over time. If the contact on the hitch deteriorates, the on-board computer or laptop program will say that the part is damaged, even if it is not.

You can prevent this from happening in the following way.

1. Check the condition of the connectors once every 5000 km. The pads should sit in place tightly, without play. If necessary, elements must be replaced with new ones.
2. Check plug connectors two to three times a year for oxidation. Oxides reduce the flow of electricity through on-board wiring, which leads to incorrect display of information.
3. Experts recommend purchasing and using oil for electrical terminals. The liquid is similar in composition to transformer lubricants. The formula prevents water and oxygen from reaching metals, which prevents them from rusting.

Important!

You can diagnose VAZ 2114 error codes on the instrument panel and ECU yourself, only if you understand the essence of the process. If you don’t have confidence in your own abilities, it is recommended to contact a qualified technician.

How to Troubleshoot or Reset Trouble Code P0505

Some suggested steps to troubleshoot and fix error code P0505:

1. Read all data and stored error codes using an OBD-II scanner.
2. Clear the codes and check if the P0505 code appears again.
3. Observe the engine's operation at idle speed, with the gear engaged and disengaged. To check whether the engine idle speed corresponds to the values ​​​​specified in the manufacturer's technical documentation.
4. Check the engine for vacuum leaks.
5. Inspect the throttle body for carbon buildup. And also on the body and inlet of the idle air bypass control valve.
6. Disconnect and check the idle air control valve.
7. Check if the idle air control valve passages are clogged.

How to get rid of error 505 in the Play Store

Error 505 appears when you try to install an application developed with Adobe Air. Its main reason is a mismatch between the software versions and the operating system. There are several options for solving this problem, and each will be discussed below. Looking ahead, we note that only one method of eliminating the error in question can be called simple and safe. Let's start with it.

Method 1: Clear system application data

Most Play Store errors that occur when trying to install or update an application can be resolved by reinstalling it. Unfortunately, the 505 we are considering is an exception to this rule. In short, the essence of the problem is that already installed applications disappear from the smartphone; more precisely, they remain in the system, but are not displayed. Consequently, they cannot be removed, nor can they be reinstalled, since they are supposedly present in the system. The 505 error itself occurs directly when trying to install software that is already installed.

To fix the problem, it is first recommended to clear the cache of the Play Store and Google Services. The data that this software accumulates while using a smartphone can have a negative impact on the functioning of both the system as a whole and its individual components.

Note: Our example uses a smartphone with Android 8.1 (Oreo) OS. On devices with previous versions of the system, the location of some items, as well as their names, may be slightly different, so look for ones that are close in meaning and logic.

1. Open Settings and go to the Applications section. Then go to the “All applications” tab (may be called “Installed”).
2. Find Play Store in the list and tap on its name to open the main application settings. Go to "Storage".
3. Here, click on the “Clear cache” and “Clear data” buttons in turn. In the second case, you will need to confirm your intentions - just tap “OK” in the pop-up window.
4. After completing these steps, go back to the list of installed applications and find Google Play Services there. Click on the application name, and then go to the "Storage" section.
5. Tap “Clear cache” and “Manage space” alternately. In the window that opens, select the last item – “Delete all data” and confirm your intentions by clicking “OK” in the pop-up window.
6. Exit to the Android home screen and restart your device. To do this, hold your finger on the “Power” button, and then select the appropriate item in the window that appears.
7. After the smartphone boots up, you should proceed in one of two scenarios. If the application that was causing the 505 error appears on the system, try launching it. If you don’t find it on the main screen or in the menu, go to the Play Store and try to install it.

If the steps described above do not help eliminate the 505 error, you should move on to more radical measures than clearing system application data. All of them are described below.

Method 2: Reinstall Google Apps

Many users, most of whom are owners of old Nexus devices, could “move” from Android 4.4 to the 5th version of the operating system, as they say, illegally, that is, by installing a custom one. Quite often, firmware from third-party developers, especially if they are based on CyanogenMod, do not contain applications from Google - they are installed in a separate ZIP archive. In this case, the cause of error 505 is the mismatch between the OS and software versions described above.

Fortunately, fixing this problem is quite easy - just reinstall Google Apps using custom recovery. The latter is probably present in the OS from third-party developers, as it was used to install it. You can find out more details about where to download this application package, how to choose the appropriate version for your device and install it in a separate article on our website (link below).

Read more: Installing Google Apps

Tip: If you have just installed a custom OS, the optimal solution would be to first reinstall it through recovery, after doing a reset, and then download another Google Apps package.

Diagnosis and problem solving

Connect the scanner, read and write down all available codes. This information may be useful if an intermittent fault is later diagnosed.

If other codes are present along with the P0505 code, diagnose and resolve them in the order in which they were stored. The most likely additional codes are usually related to the vacuum system.

Therefore, check the vacuum system for leaks caused by damaged vacuum lines. If necessary, repair and clear all codes before operating the vehicle. Then, retest the system to see if any codes are returned.

Throttle valve

If the code persists, remove the throttle body from the intake tract and inspect it for excessive carbon deposit buildup. In some cases, it may be possible to remove light carbon deposits from the throttle body and auxiliary air passages using approved cleaners.

However, heavy deposits usually cannot be removed without damaging the throttle body or idle air control valve. In these cases, the best option is to replace the throttle body or idle air control valve with original parts.

When installing cleaned or replaced parts, ensure that all seals and gaskets are also replaced to prevent vacuum leaks. Double check all vacuum line connections before starting the engine or operating the vehicle.

Checking wires and connections

If the P0505 code persists, perform a thorough visual inspection of all associated wiring. Look for damaged, burnt, shorted or corroded wires and connectors.

Once no visible damage is found, check resistance, ground, and reference voltage. Compare all readings obtained with the data specified in the manual. Replace wiring as necessary to ensure all readings are within manufacturer specifications.

ERRORS ON-BOARD COMPUTER VAZ 2110: NOTE TO OWNERS OF “TENS”

VAZ 2110 error codes are presented numerically on the display, and they are transmitted from phase sensors to the on-board computer. This is convenient, but a novice driver will not understand much and will not be able to figure out how to use this equipment. But you need to know and be able to do this, since the system, thanks to the built-in self-diagnosis function, will help to identify a malfunction in the early stages, which means it is possible to eliminate it in a timely manner.

Diagnostics

There are two ways to diagnose the condition of car systems. Let's start with the first one, which does not involve the use of additional equipment.

To start the self-diagnosis function, you need to press a button that resets the mileage for the day. Turn on the ignition. You will see how the arrows on the instruments begin to move from one position to another. This means that the diagnostics of the VAZ 2110 has been launched and information has begun to flow from the phase sensors to the ECU. After the process is completed, the RAM will transmit numbers to the display that will show the state of the car’s systems.

Decoding combinations

When the self-diagnosis is completed and the number 0 is displayed, this means that everything is in order with the vehicle and all systems are working as expected:

1. if 1 is displayed, this indicates that there are problems with the microprocessor or the RAM is failing;
2. 4 - high voltage in the network, more than 16 V;
3. if 8, then low.

If there is not one fault, but several, then a figure equal to the sum of faults will be displayed. If 6 lights up, then this will mean the sum of the numbers 2 and 4. If 14, then most likely there are three malfunctions at once, namely 2, 4 and 8.

The simplest diagnostics that is available to the driver without the use of additional equipment. It will, of course, help identify some faults, as well as show the condition of the components and systems of the VAZ 2110 as a whole. But to specifically identify all faults and decipher information coming from phase sensors, additional tools are needed. For example, the on-board computer STATE, which provides more data.

Diagnostics using additional tools

To diagnose cars, including the VAZ 2110, various equipment is used, which is connected to a special connector. Thanks to this equipment, which is not particularly complicated or expensive, you can get a complete picture of the condition of the car.

The service station uses a personal computer to which data from phase sensors is transmitted via a special cable.

Bluetooth devices have appeared on the market that allow diagnostics using a smartphone, tablet or laptop.

They work according to the scheme. The device is connected to the connector, the ignition is turned on and the diagnostic process begins. The data comes from phase sensors to the ECU. From it to a mobile device on which specialized software must first be installed.

This makes it possible not only to obtain more data, but also to present it in a more visual form. This method allows a driver, even with little experience in operating a car (in our case, a VAZ 2110), to obtain all the data about his car.

But most drivers prefer to carry out diagnostics at a service station. So that you are aware of the data that the on-board computer produces through RAM from the phase sensors, we will present the transcripts of common errors.

Decoding combinations

If problems arise with electrical equipment, they must be corrected immediately. Error code 1602 will indicate that not everything is in order in this matter.

Sometimes error 1602 can simply be reset and does not appear in the future. Socialists call such data “good.”

Error 1602 sometimes appears if:

1. the battery was disconnected for some time;
2. there was a voltage surge when starting the engine, for example, in cold weather.

But if error code 1602 appears all the time, you need to check the entire network. Perhaps there is a break. If error code 1602 constantly appears, you can try cleaning the battery terminals. Check if they are securely fastened. Didn't help, error 1602 still appears? Check the circuit. You need to start from the positive terminal of the battery. Start with the electrical fuse and fuse link.

Check the ground of the ECU, TPS. Sometimes it happens that the cause of error code 1602 is an alarm that can block the controller circuit and affect the readings of the phase sensors. In such a situation, you need to file a claim with the company that installed the alarm.

Error 0102 indicates a low signal level, which is reported from the mass air flow phase sensor.

Code 0102 will be stored in RAM memory in the following situations:

1. low air consumption, which depends on the speed of rotation of the crankshaft;
2. how open the throttle is;
3. Several cycles have passed since the problem appeared.

If the error appears periodically, then you need to:

1. check the condition of the air barrier;
2. fastening the wiring block to the ECU;
3. check IAC;
4. clean the throttle pipe.

Another error that may occur is 0300. 0300 appears in cases where the RAM detects frequent misfires.

If error code 0300 is displayed constantly, then you need to check the following components:

1. spark plug;
2. nozzles;
3. ignition system;
4. increased or decreased compression levels may be the cause of code 0300;
5. Also, code 0300 may appear in case of wiring failure.

You cannot ignore the appearance of error 0300. In the future, this may lead to deterioration in the performance of other nodes.

It is not difficult to master car diagnostics, in particular the VAZ 2110. It will extend the service life due to timely detection of faults detected by phase sensors.

Video “How to reset Check error”

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On which cars is this problem most common?

The problem with code P0505 can occur on different machines, but there are always statistics on which brands this error occurs more often. Here is a list of some of them:

• BMW (BMW 330i)
• Chrysler
• Daewoo (Daewoo Lanos, Matiz, Nexia)
• Dodge (Dodge Durango, Ram, Stratus)
• Fiat (Fiat Punto)
• Ford
• Honda (Honda Accord, SRV)
• Jeep (Jeep Wrangler, Grand Cherokee)
• Lexus
• Mazda (Mazda 6)
• Mitsubishi (Mitsubishi Karizma, Lancer, Montero, Pajero)
• Nissan (Nissan Almera, Maxima, Pathfinder, Primera)
• Opel (Opel Astra, Vectra, Zafira, Corsa)
• Renault (Renault Duster, Logan, Sandero)
• Scion xB
• Suzuki
• Toyota (Toyota Vitz, East, Camry, Corolla, Prius, Probox, Rav4, Harrier, Echo)
• VAZ 2107, 2109, 2110, 2112, 2114
• Zaz Sens, Chance
• Lada Granta, Kalina, Largus, Niva

With fault code P0505, you can sometimes encounter other errors. The most common ones are: P0036, P0056, P0102, P0302, P0304, P0444, P0500, P0506, P0507, P0600, P1145, P1519, U1602.

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