Error P0203 - Injector 3 - Circuit Malfunction

For about a month, almost every day I caught error p0203, the most interesting thing is that if you clear the error and restart the car, the error most often does not appear again until the next time the ignition is turned off))) From the symptoms when the ignition is turned on when the ignition is cold, it was necessary to turn old man for 6-7 seconds, only then the car shook and started (after which I cleared the error and then drove normally). There were times when the error was caught while moving, after which there was a kick and the pedal became “soft” (I don’t know how to explain it, you just need to feel it). Well, as expected, slightly increased consumption)

Reading the Internet made me sad, because as usual, the standard instructions are to check the module (what the hell is a module if the injector is showing off), check the high voltage wires, replace the camshaft sensor (in principle, although the advice is dubious, but after I dropped the chip from the camshaft sensor and started the car, a sensor error appeared, but the break error disappeared for a couple of days, again - it was most likely flares in the sun that influenced the fact that the error disappeared), and the most probably adequate advice was to measure the injector resistance, which was actually done, as It’s strange, but the injector turned out to be working, the resistance was 15 ohms, which means the only thing left was to gut the wiring. Having disassembled the harness, I found that one of the wires was held on by 3 hairs of the wire, bingo, I thought, but it was not there, pulling my pussy to my nose, I decided to look at which force the frayed wire goes to, and to my surprise it turned out to be not cylinder 3 but the first O_o , figs, I cut it up and put it in heat shrink and went on to gut the wiring. I didn’t have to gut it very far, pay attention to the attached photo)))))

Where do you think this wire goes? Yes, yes, is this the same wire going to injector 3? The funny thing is that the other day my father asked what kind of wire was sticking out of the harness and why it was just twisted, to which my answer was that who knows, if you break it, nothing happens, annette, it still happens? I gave it a drink too, then packed all the wiring, stuck all the chips in place, inserted the key, turned it with the old one, drum roll, the car started up with half a turn) I close the hood and without looking back I go into the sunset?

What does P0203 mean?

P0203 indicates that the engine control module (ECM) has detected a malfunction in the cylinder 3 fuel injector control circuit. This error code will appear if the vehicle's ECM detects abnormal voltage or resistance in the injector 3 control circuit.

When this error occurs, the vehicle's ECM will put the engine into limp mode to prevent further damage. The engine will remain in this mode until the error is cleared.

Symptoms of malfunction

The main driver symptom of P0203 is the MIL (Malfunction Indicator Light) illumination. 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 the ECM memory as a malfunction).
2. Floating speed, the car engine may operate unstably.
3. Increased fuel consumption.
4. The engine stalls or has trouble starting.
5. Jerking/misfire at idle or under load.
6. Poor speed gain.
7. Black smoke from the exhaust pipe.

P0203 is above average in severity and should be used with caution. Because the vehicle may experience serious problems, potentially affecting safety.

How does a mechanic diagnose a P0203 code?

First, the mechanic will connect the OBD-II scanner to the vehicle's diagnostic port and read all stored data and error codes to determine under what circumstances the P0203 error occurred. He will then clear the error codes from the computer's memory and test drive the vehicle to see if P0203 appears again. If the error code appears again, the mechanic will check the cylinder 3 fuel injector and associated wires and connectors for damage.

After this, he will check the voltage of the fuel injector of cylinder 3. If necessary, the mechanic will check the operation of the injector using a warning light that is installed on the fuel injector wires and lights up if the injector is working properly.

If no problem is found, the mechanic will check the ECM.

Diagnosis and problem solving

When diagnosing fault P0203, check for battery voltage (12 V) at the injector connector wire. If there is no voltage, check the continuity of the circuit to ground using a test lamp. Connected to the battery positive. If it lights up, it means there is a short circuit to ground in the voltage supply circuit.

Repair the short circuit in the voltage supply and restore proper battery voltage. Don't forget to check the fuse and replace it if necessary.

One injector can short-circuit the voltage supply from the battery to all injectors.

If battery voltage is being supplied to the injector wiring harness, the next step is to turn on the indicator light to check the injector driver is working. Install an indicator light in the injector harness instead of the fuel injector. Which will flash quickly when the injector drive is operating.

Check the resistance on the fuel injector if you have the resistance specifications. If the resistance is higher or lower than the nominal value, replace the fuel injector. If the injector passes the test, the problem is most likely loose wiring.

Remember that a fuel injector may work fine when cold but malfunction when hot, or vice versa.

Checking the wiring harness

Check the wiring harness for chafing and the connector for loose connections or a broken lock. Repair as necessary and check if P0203 returns.

Disconnect the PCM connector and connect to the fuel injector driver circuit. Any resistance means there is a problem. Infinite resistance indicates an open circuit. Find and repair, then try again.

If you cannot find any problems with the harness but the fuel injector driver is not working, check the PCM power and ground. If they are OK, the PCM itself may be faulty.

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DIAGNOSE YOUR CAR YOURSELF!

Code P0203 is entered if:

the engine is running; self-diagnosis of the injector driver has determined that there is no load on one or more outputs. The CHECK ENGINE lamp lights up immediately after a malfunction occurs.

1. Check the resistance between the contacts of the injector harness block.

2. Check the resistance of the circuit between the controller harness block and the injector harness block.

3. Check the resistance of the injector of the idle cylinder.

HOW TO CHECK:

Connect the adapter cable to the diagnostic connector. Turn on the ignition, start the engine. Select "Errors" from the menu.

The fault code may not be active at this time. Code P0203 is intermittent. If there are no other codes, analyze the conditions for the occurrence of the code. The MP7.0N controller uses an injector driver with a self-diagnosis function. It can detect the presence of faults such as an open, short to ground or power supply in the injector control circuits.

1. Stop the engine. Disconnect the injector harness connector. Using a multimeter, check the resistance between terminals “E” and “B” of the injector harness block.

The resistance should be within 11..15 Ohms.

2. Disconnect the harness connector from the controller. Using a multimeter, check the resistance of the injector control circuit of the idle cylinder between the controller harness block and the injector harness block.

Resistance less than 1 ohm indicates a loose connection or a faulty controller.

Resistance greater than 1 ohm indicates a wire break between the controller harness block and the injector harness block.

3. If the resistance went beyond 11..15 Ohms, disconnect the wires from the injector of the idle cylinder. Check the injector resistance with a multimeter.

Resistance within 11..15 Ohms indicates a wire break in the injector harness or a weak connection.

Otherwise the injector is faulty.

After repair, start the engine, reset the codes and make sure there is no signal from the “CHECK ENGINE” lamp.

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What to do if the problem recurs

If you replaced the knock sensor and deregistered p0327 in the ECU, and the “Check engine” icon appears again, then the problem may be in the engine sensor itself. It needs to be checked. You will need a multimeter, which should be set to resistance measurement mode (ohmmeter). The minimum threshold value is 5 MΩ (operating alternating voltage: U= 0.5–3 V). If it shows below, then the sensor is defective. It is unprofitable to repair it, since a new one costs about 250 rubles.

Another reason: the DD is attached to the cylinder block with a bolt. But its crimping force is small, so the detonation signal is weak. Experts recommend using a pin instead of a bolt, and tightening the sensor with a nut. Then the risk of error p0327 is sharply reduced. In addition, you should make sure that the formation of a malfunction is not caused by: extraneous knocks, such as vibration of the pan protection or the clatter of hydraulic compensators, as well as poor-quality fuel or poor fastening of the engine to the cylinder block.

On a note. Experts recommend buying one of two brands of knock sensors. First original: AvtoVAZ number 21120–3855020–03–0. Second analogue: Bosch - 0 261 231 046.

Nuances of self-diagnosis

Indications for self-diagnosis and contacting specialized service stations will be different, error codes are also displayed differently. Therefore, today we will consider two options.

It is not at all necessary to use the on-board computer to diagnose problems with the car. Not all VAZ 2114 owners know about this method, so we will definitely tell you about it.

It consists of the following steps.

1. Sit in the driver's seat and hold down the odometer button.
2. Then turn the ignition key to the first position.
3. Release the odometer button. After this, the arrows will start moving.
4. Press the button again and turn it off. This will allow you to see which firmware version is used in your case.
5. Press and release the button a third time. So you will see codes indicating the presence of certain errors in the operation of the car.

Let's now look at the most popular errors that occur during such diagnostics and figure out what the code means. Even without an on-board computer, you can detect faults on the VAZ 2114 using the odometer codes.

general information

Error code p0327 is commonly referred to as “low knock sensor signal.” The defect is found on cars such as: VAZ, for example Grant, Niva or Priora, GAZ - GAZelle or UAZ - Patriot. If the system malfunctions, the voltage from the signal in the circuit does not exceed 0.5 V. At the same time, the “Check engine” icon may not light up, since this requires at least 2 drive cycles. That is, any pair of trips in which the engine temperature rises from cold, less than 49 °C, to acceptable operating temperature - above 71 °C.

VAZ error codes and their interpretation

Dear friends, since carburetor VAZs are already history, and the vast majority of VAZ owners, from classics to grants, are happy owners of injection engines, this does not eliminate the need to diagnose the engine and eliminate certain problems. And if earlier we simply changed spark plugs in any incomprehensible situation, adjusted the ignition and cleaned or purged the carburetor, then in an injection engine everything is somewhat more complicated, since everything is controlled by the ECU - the brains of the car. Many people acquire on-board computers, but not every bookmaker knows how to decipher errors ; most bookmakers simply show the error code , if there is one, and the car owner (or a diagnostician) will have to decipher this error And since every check error makes it expensive to go to a diagnostician, and the choice of bookmakers in the budget segment is quite large, and almost any driver will be able to purchase this useful device in a car, we are posting VAZ error codes with decoding so that you can easily identify one or another engine error.

Decoding error codes issued by the ECU of VAZ cars

Description of fault codes for controllers ME17.9.7 and M74

With On-Board Diagnostic (OBD) system

Without on-board diagnostics (OBD)

Diagnostic Trouble Codes (1.8/2.0L I4)

With On-Board Diagnostic (OBD) system

The codes shown in brackets () are only applicable to vehicles equipped with an immobilizer.

Without on-board diagnostics (OBD)

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