Secondary Air Injection : Malfunction (Functional Chain)

Secondary Air Injection : Malfunction (Functional Chain)

Test 1 Test secondary air injection (function chain). (only (USA), EURO 3)
Test 2 Check component M33 (electric air pump). (only (USA), EURO 3)
Test 3 Check component Y32 (Air pump switchover valve). (only (USA), EURO 3)


1 Test secondary air injection (function chain). (only (USA), EURO 3)

Test sequence
- Ignition ON
- Test secondary air injection (function chain).(Actuate with key F2.)

Note: Component M4/3 (engine/AC electric suction fan) runs with an on/off ratio of 50 % during the actuations for safety reasons.

Note! Communication with ECU required.


2 Check component M33 (electric air pump). (only (USA), EURO 3)

Test 2-1 Test actuation of component M33 (electric air pump)
Test 2-2 Test voltage supply of component M33 (electric air pump)
Test 2-3 Check component K40/7kN (Air pump relay)


2-1 Test actuation of component M33 (electric air pump)

Test requirement
- Engine at idle speed
- Actuate component M33 (electric air pump).(Actuate with key F2.)

Note: Component M4/3 (engine/AC electric suction fan) runs with an on/off ratio of 50 % during the actuations for safety reasons.

Note! Communication with ECU required.


2-2 Test voltage supply of component M33 (electric air pump)




Figure legend
- 003 Multimeter
- M33 (electric air pump)

Test requirement
- Actuation is not okay.

Test sequence
- Switch off ignition.
- (M33) 2 <--> 1 (M33)
- Switch on ignition.
- Actuate with key F2.

Specified value
- Voltage[11.0...14.5] V

Note! Communication with ECU required.


2-3 Check component K40/7kN (Air pump relay)

Test current consumption of component K40/7kN (Air pump relay).

Test requirement
- Fault code 'P1453' present

Test sequence
- Switch off ignition.
- Connect socket box to component N3/10 (ME-SFI control module).
- (A.3) 3 <--> 20 (C.28)
- Switch on ignition.

Specified value
- Amperage [0.1...0.3] A

Question
- Is the measured value okay?
Yes
The measured value is o.k. ** End of Test **
No
The measured value is not o.k.
Possible cause and remedy
- Leads to component K40/7kN (Air pump relay)
- K40/7kN (Air pump relay)

** End of Test **


3 Check component Y32 (Air pump switchover valve). (only (USA), EURO 3)

Test 3-1 Test actuation of component Y32 (Air pump switchover valve)
Test 3-2 Test current consumption of component Y32 (Air pump switchover valve)


3-1 Test actuation of component Y32 (Air pump switchover valve)

Test sequence
- Ignition ON
- Actuate component Y32 (Air pump switchover valve).(Actuate with key F2.)

Note: Component M4/3 (engine/AC electric suction fan) runs with an on/off ratio of 50 % during the actuations for safety reasons.

Note! Communication with ECU required.


3-2 Test current consumption of component Y32 (Air pump switchover valve)

Test requirement
- Actuation is not okay.

Test sequence
- Switch off ignition.
- Connect socket box to component N3/10 (ME-SFI control module).
- (A.3) 3 <--> 66 (E.10)
- Switch on ignition.

Specified value
- Amperage [0.3...0.5] A

Question
- Is the measured value okay?
Yes
The measured value is o.k. ** End of Test **
No
The measured value is not o.k.
Possible cause and remedy
- Voltage supply of component Y32 (Air pump switchover valve) (Wiring diagrams)
- Leads to component Y32 (Air pump switchover valve)
- Y32 (Air pump switchover valve)

** End of Test **