Mondeo vikakoodia pukkaa

Moottori, voimansiirto, viritys jne.
Wade
Viestit: 2
Liittynyt: 20 Kesä 2018 09:33

Mondeo vikakoodia pukkaa

Viesti Kirjoittaja Wade »

Tervehdys! Osaakos palstalaiset auttaa seuraavassa ongelmassa. Nykyinen mondeoni -03 1.8 sci herjaa vikakoodia P0546. Moottorin häiriövalon saa kuitattua testerillä hetkeksi pois mutta syttyy hetken päästä uudelleen(viimeistään silloin kun starttaa auton uudelleen). Katsastusta on ihan turha koittaa tuon häiriövalon kanssa joten olisi kiva tietää kuinkahan suurta remppaa on tiedossa ennen vikalistan hakua. Onkos muilla palstalaisilla kokemuksia tästä sci versiosta? Edellisen normi 1.8 mondeon(110hv) jälkeen tämä tuntuu olevan enempi maanantaipäivän malli.
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NiceMan
Moderaattori
Viestit: 2515
Liittynyt: 03 Helmi 2005 20:39
Paikkakunta: Helsinki
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Re: Mondeo vikakoodia pukkaa

Viesti Kirjoittaja NiceMan »

P0546 OBD-II Trouble Code: Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 1
P0546 code means that the malfunction is related to the exhaust gas temperature sensor circuit due to loose terminals, wiring issues, or faulty sensor

P0546 code definition

The P0546 code means Exhaust Gas Temperature Sensor (EGT) Circuit High Bank 1 Sensor 1. Alternately, code P0545 may be present, indicating sensor circuit low.
What the P0546 code means

P0546 indicates that there is a malfunction related to the exhaust gas temperature sensor circuit. The purpose of the sensor is to protect the catalytic converter from heat damage. This sensor converts temperature to voltage, and inputs this data to the PCM (powertrain control module). If the voltage sent to the PCM exceeds the predetermined limits set by the vehicle manufacturer, the vehicle will store this code.
What causes the P0546 code?

There are several problems that can cause the sensor to send an excessive voltage signal to the PCM, including:

Damaged or loose terminals or connectors
Broken or corroded wires resulting in a short to ground
A faulty EGT sensor
An internal or ground short in the EGT sensor
An aftermarket exhaust system with no EGT provisions
A major exhaust leak upstream of the EGT sensor

What are the symptoms of the P0546 code?

The symptoms of this code typically only include the stored code itself, as well as a lit Check Engine Light.
How does a mechanic diagnose the P0546 code?

The steps involved in diagnosing this issue include:

Clearing the code(s), then road testing the vehicle and checking for it to come back.

Visually inspecting the exhaust gas temperature sensor and relevant circuitry, focusing in particular on areas that may be in contact with hot components

Inspecting connectors for corrosion or loose connections

Inspecting wires for missing insulation or other damage that could cause a short to ground

Checking the EGT sensor’s resistance using an ohmmeter to ensure it has around 150 ohms

Using a heat gun or hair dryer to heat the sensor while observing the ohmmeter to ensure that the resistance is dropping as the sensor heats up, and rising as it cools down

Testing the voltage on the engine end of the pigtail to ensure that there are five volts at this connector

Common mistakes when diagnosing the P0546 code

The oxygen sensor can sometimes be mistaken for the EGT sensor. The two are different in appearance, however, with the EGT sensor being simply a two-wire plug. It is located between the exhaust manifold and the catalytic converter. Replacing the oxygen sensor will not correct this trouble code. If you’re not confident about your ability to recognize and diagnose the correct sensor, consult a professional.
How serious is the P0546 code?

If not attended to promptly, this code indicates a problem that could lead to catalytic converter damage. While there are temporary fixes that can fool the computer into no longer setting the code, the issue should be addressed as soon as possible.
What repairs can fix the P0546 code?

Repairs that may fix the P0546 code may include:

Clearing all codes and ensuring that the code returns when the vehicle is road tested
Visually inspecting theEGT sensor wiring and connectors and replacing if damaged
Testing the sensor resistance and replacing if below 50 ohms
In rare cases, replacing the PCM (powertrain control module) or ECM (engine control module)

Additional comments for consideration regarding the P0546 code

Keep in mind that one of the possible causes of this code – installing a catback system in place of the catalytic converter – is against the law in many states due to these systems creating high emissions levels. Before performing such a modification, you should check your state and local laws to make sure that there are no restrictions on such a procedure.

As you inspect the sensor’s connectors for corrosion or loose connections, make sure you go up the pigtail to the connector to make sure that one is secure as well.
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