Emissions - MIL ON/DTC 4D35 Stored

SI B 11 02 10
Engine

June 2010
Technical Service

SUBJECT
E90 M57Y - Diagnosis of SCR Metering Valve for Fault Code 4D35

MODEL
E90 with the M57Y diesel engine

SITUATION
The Service Engine Soon lamp is illuminated. FC 4D35 "Reducing agent metering valve plausibility" is stored in the DDE 7.3.

CAUSE
The metering (dosing) valve is clogged or partially clogged with crystallized diesel exhaust fluid (DEF).

PROCEDURE

Using an ISID, activate the metering valve using the test plan "B1365_D7USNAB-Activation and calibration of SCR system M57TUTOP2 US diesel". Select: (2) Activate SCR components; then select (4) SCR Metering valve in the exhaust system.

1. Does the SCR metering valve audibly "click"?

^ If yes, remove the valve and flush out the inlet and outlet sides of the valve with water, and reinstall the valve.

^ If no sound is heard, proceed to step 2.

2. Remove the metering valve and flush out the inlet and outlet sides of the valve with water.

^ Activate step 4 again in the ISID. Does the valve now click?

^ If yes, reinstall the valve.

^ If the valve still does not click, replace the metering valve.

Important Note:
While performing either of the above steps, also check the mounting flange opening for the SCR metering valve on the exhaust front pipe for a "plug" of crystallized DEF; clean it out if necessary





PARTS INFORMATION





WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.