B0704 Audi Quattro OBD Code

OBD/2 B0704 error code description and symptoms.

Engine Coolant Temperature (ECT) Circuit High Input Indicates the sensor signal is greater than Self-Test maximum. The ECT sensor maximum is 4.6 volts or -50 C (-58 F). Note on some vehicles that are not equipped with an ECT sensor, CHT can be used and can set this DTC. Open circuit in harness Sensor signal short to power Damaged PCM Improper harness connection Damaged sensor ECT V PID reading greater than 4.6 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault.

As long as the throttle plate remains closed, the idling speed and quality is controlled by the PCM via the idle control valve, and as can be seen from the above it should be clear that idle control on a gasoline engine is a complex affair. For instance, if the engine is started in sub-zero temperatures, the PCM will command the idling control valve to allow less air to enter the engine to enrich the air/fuel mixture to create a condition which is roughly analogous to how chokes worked on carburetted engines to control idling in cold weather.

B0704 Audi Quattro Error Code Repair Process :

For elc system 2 fault check engine light is perhaps the most troubling of lights because it could mean so many different things, from you didn't screw the gas cap on tightly enough to look out for pistons flying through the hood and into the stratosphere. The easiest way to find out what this light is telling you is to hook your vehicle up to a scan tool. B0704 error code diagnostic tool looks a little like an oversized calculator and plugs into a communication port inside the car. After you instruct it to perform the scan, it speaks elc system 2 fault with your car's computers to find out exactly what's prompting the light to turn on.

Common Causes of Audi Quattro B0704 OBD2 Code

A common cause of code B0704 is the failure of ELC System 2 Fault, but there are several other possible causes as well, such as ;

Engine Control Module (ECM)
Faulty Crankshaft Position Sensor (POS)
Fuel tank leaking
Faulty TCM or TCM programming

B0704 is a kind of Body Trouble Code

Auto body problems aren't always easy to spot. Diagnosing auto body problems sometimes requires a little know-how. In this section you'll find articles dedicated to teaching you how to diagnose auto body problems.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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B0704 Audi Quattro OBD Code

B0704 Audi Quattro Error Code Repair Process :

Common Causes of Audi Quattro B0704 OBD2 Code

B0704 code for other Audi cars