- Secondary air injection
- M33 (electric air pump)
- Y32 (Air pump switchover valve)
Affected functions:
- Engine diagnosis
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Test 1: Test secondary air injection (function chain).
Test 2: Check component M33 (electric air pump).
Test 3: Check component Y32 (Air pump switchover valve).
1. Test secondary air injection (function chain).
Test sequence
- Switch on ignition.
- Test secondary air injection (function chain).(Move on to actuation with button 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).
Test 2.3: Check component N10/1kR (Air pump or oil cooler fan relay).
2.1. Check component M33 (electric air pump) by means of actuation.
Test prerequisite
- Switch on ignition.
- Actuate component M33 (electric air pump).(Move on to actuation with button F2)
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.
- Proceed to 'Actuation' with F2
Specified value
- Voltage[11.0...15.0] V
