ME2.7.2(AMG)

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


Possible cause:

- Secondary air injection: malfunction (function chain)
- M33 (electric air pump)
- N10/1kA (Air pump relay)
Affected functions:

- Engine diagnosis

-------------------------------------------------

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

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

Test 3: Check component N10/1kA (Air pump relay).

Test 4: Check component N10/9kO (Charge air cooler recirculation pump relay) by means of actuation.

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

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


Warning!Communication with ECU required.

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).

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.

3. Check component N10/1kA (Air pump relay).
Test prerequisites

- Fuse K40/4f32 (Fuse 32) is OK.
- 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).
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 K40/4kO (Air pump or reserve relay).:
- Use fuse cable for bridge.
- 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 K40/4kO (Air pump or reserve relay)
- K40/4kO (Air pump or reserve 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 K40/4kO (Air pump or reserve relay)
- K40/4kO (Air pump or reserve relay)
End of test







4. Check component N10/9kO (Charge air cooler recirculation pump relay) by means of actuation.
Test prerequisite

- The power supply of component N10/9 (SAM control module with fuse and relay module, front passenger) is OK.
- Fault code 9143 is present, or a relevant actual value is not OK.
Status of the relevant fault codes:Test sequence

- Carry out actuation of component N10/9kO (Charge air cooler recirculation pump relay).
- Call up 'Actuation' with key F2 .







Warning!Communication with ECU required.