ME-SFI secondary air injection malfunction (causal chain) - fault code description

AD07.61-P-4000-15L

ME-SFI secondary air injection malfunction (causal chain) - fault code description

Engine 137.970



Air injection malfunction (causal chain)

1

Fault code

( Readout on generic scan tool)

P2003 right cylinder bank, cylinders 1 to 6 (P0410)

P20C9 left cylinder bank, cylinders 7 to 12 (P0410)

2

Fault storage

Actuation of engine diagnosis indicator lamp (EURO4)

or CHECK ENGINE (MIL) malfunction indicator lamp 

after expiry of test duration and fault

following two successive driving cycles with faults

3

Checking frequency

once per driving cycle

4

Checked signal or status

Closed-loop mixture control

5

Fault setting conditions

Checking duration

Increase in the lambda control factor by at least +25% ("rich"- stop)

approx. 10 seconds

6

Check prerequisites

- rngine idling

- vehicle stationary

- air pump activated at least once after engine start

- no fault on voltage supply to purge control valve, air pump switchover valve and electric air pump

- no fault in purge system

- no fault in throttle valve actuator

- no misfiring

- no fault in O2 sensor upstream of TWC, aging

- no fault in CAN data bus

- self-adaptation of the mixture formation not at limit

- air pressure more than approx. 780 hPa (i.e. no test is performed above a height of approx. 2500 meters)

- coolant temperature higher than 50°C

- lambda control enabled

- AC off.

7

Checking procedure

On starting the causal chain, all functions for self-regulation of mixture adjustment are locked, the switchover valve for regeneration is closed and the current lambda controlling factor recorded. This is followed by air injection. The mixture must be made leaner. The lambda control factor reacts in a corresponding manner with an increase of more than +25%.

8



If a prerequisite changes during the test, the test is interrupted and started again later.

For engine 137 actuation of the air injection occurs for each cylinder bank.