Malfunction of secondary air injection (function chain) (P0410)

Malfunction of secondary air injection (function chain) (P0410)

Test 1: Test secondary air injection (function chain).

Test 2: Check component M33 (electric air pump).

1. Test secondary air injection (function chain).
Test sequence

- Engine at idle
- Test secondary air injection (function chain).(Actuate with key F2.)


Actuations
Component M4/7 (Engine and AC electric suction fan with integrated control) runs with an on/off ratio of 30 % during the actuations for safety reasons.

1. No further information available.


2. Check component M33 (electric air pump).

Test 2.1: Check component M33 (electric air pump) by means of actuation.

Test 2.2: Check power supply of component M33 (electric air pump).

Test 2.3: Check component K17 (Secondary air injection relay).

2.1. Check component M33 (electric air pump) by means of actuation.
Warning!Communication with ECU required.

2.2. Check power supply of component M33 (electric air pump).
Test prerequisite

- Actuation is not OK.
Test sequence

- Switch off ignition.
- (M33) Measure direct voltage with multimeter between 2 and 1 (M33)
- Switch on ignition.
- Actuate with key F2.
Specified value

- Voltage[11.0...14.5] V













Warning!Communication with ECU required.


2.3. Check component K17 (Secondary air injection relay).
Test prerequisites

- Actuation of component M33 (electric air pump) is not OK.
Test sequence

- Switch off ignition.
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Measure direct current with multimeter between sockets [3.4] 37 and (4.21) 106 of the 126-pole socket box tester.
- Switch on ignition.
Warning!Perform the measurement only for a short time so that component M33 (electric air pump) does not overheat.Specified value

- Amperage[0.1...0.3] A
- Component M33 (electric air pump) is switched on and is heard to run.
Question

- Is the measurement value OK?


YES
The measurement value is OK.Question

- Does component M33 (electric air pump) run during the current measurement?


YES
The test was okay.End of test

NO
Test actuation of component M33 (electric air pump).
Figure legend

- K17 (Secondary air injection relay)
Test sequence

- Switch off ignition.
- Detach coupling at component M33 (electric air pump).
- (M33) Measure direct voltage with multimeter between 2 and 1 (M33)
- Switch on ignition.
- Insert bridge for actuating component K17 (Secondary air injection relay).:
- Bridge between sockets [3.4] 37 and (4.21) 106 of the 126-pole socket box tester.
Specified value

- Voltage[11.0...14.5] V
Question

- Is the measurement value OK?


YES
The measurement value is OK.Further possible causes of fault

- M33 (electric air pump)
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Voltage supply of component K17 (Secondary air injection relay)
- K17 (Secondary air injection relay)
- Lines to component M33 (electric air pump)
- M33 (electric air pump)
End of test







NO
The measurement value is not OK.Possible cause and remedy

- Lines to component K17 (Secondary air injection relay)
- K17 (Secondary air injection relay)
End of test