U3477 Mercedes E 300 OBD Code

OBD/2 U3477 error code description and symptoms.

Intake Manifold Runner Control Malfunction (Stuck Open) The IMRC system is monitored for failure during continuous, key ON engine OFF or key ON engine running self-test. The test fails when the signal on the monitor pin is less than an expected calibrated range at closed throttle. IMRC monitor signal circuit shorted to PWR GND or SIG RTN Damaged IMRC actuator Damaged PCM An IMRCM PID reading approximately near 1 volt at closed throttle may indicate a fault.

As the engine heats up and combustion becomes easier and more complete, the PCM will command the idling control valve to increase the amount of air entering the engine to suit the changing conditions. However, when the load on the engine changes, say, when some electrical consumers or other systems are either turned on or off, the PCM adapts the signal voltage to the idle control valve to ensure that the idling speed remains stable, and at the RPM specified by the manufacturer.

U3477 Mercedes E 300 Error Code Repair Process :

If your egr calibration high check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system U3477 and engine control unit are in charge of monitoring a bunch of different egr calibration high, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Mercedes E 300 U3477 OBD2 Code

A common cause of code U3477 is the failure of EGR Calibration High, but there are several other possible causes as well, such as ;

1Camshaft Position Sensor circuit poor electrical connection
Air fuel ratio (A/F) Sensor 1 Bank 1 harness is open or shorted
Faulty Intake Valve Timing Control Solenoid Valve
Fuel tank leaking

U3477 is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

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

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U3477 Mercedes E 300 OBD Code

U3477 Mercedes E 300 Error Code Repair Process :

Common Causes of Mercedes E 300 U3477 OBD2 Code

U3477 code for other Mercedes cars