[1] Check system 'Exhaust gas recirculation control'.: The air mass is too small.

[1] Check system 'Exhaust gas recirculation control'.: The air mass is too small.

Test 1: Important note:Before performing further work, check whether a diesel particulate filter was retrofitted.A clogged diesel particulate filter can cause this fault entry.

Test 2: Check component Y27/9 (Left EGR positioner).

1. Important note:Before performing further work, check whether a diesel particulate filter was retrofitted.A clogged diesel particulate filter can cause this fault entry.

1. No further information available.


2. Check component Y27/9 (Left EGR positioner).

Test 2.1: In the case of warranty or goodwill operations, see TIPS document in design group 07.16

Test 2.2: Inspect charge air system for leaks.

Test 2.3: Check actual value Y27/9 (Left EGR positioner).

Test 2.4: Actuation of component Y27/9 (Left EGR positioner)

Test 2.5: Check component Y27/9 (Left EGR positioner).

2.1. In the case of warranty or goodwill operations, see TIPS document in design group 07.16

2.1. No further information available.


2.2. Inspect charge air system for leaks.
Inspect charge air system for leaks.
Important notes

- The following test sequence has changed.
- Follow the test procedure precisely!
- The test must be performed with the engine oil cap removed.
Communication with ECU required

2.3. Check actual value Y27/9 (Left EGR positioner).
Test prerequisite

- Engine at idle
- Briefly blip throttle.
Status of relevant actual value:
- Exhaust gas recirculation positioner:Warning! Communication with ECU required.
Specified value

- Engine at idle
- On/off ratio:( >35 ) %
Question

- Is the actual value o.k.?


YES
The actual value is okay.If faults with high fault frequency counters or customer complaints are stored, inspect cables and plug connections between control module N3/9 (CDI control unit) and component Y27/9 (Left EGR positioner) for loose contact and corrosion.End of test

NO
The actual value is not o.k.Possible cause and remedy

- Check component Y27/9 (Left EGR positioner) by means of actuation.
End of test

2.4. Actuation of component Y27/9 (Left EGR positioner)
Warning!Communication with ECU required.


2.5. Check component Y27/9 (Left EGR positioner).

Test 2.5.1: Check power supply of component Y27/9 (Left EGR positioner).

2.5.1. Check power supply of component Y27/9 (Left EGR positioner).
Test prerequisite

- The actuation was not okay.
Figure legend

- Y27/9x1Plug connection Exhaust gas recirculation positionerLeft
Test prerequisite

- Switch off ignition.
- Detach coupling at component Y27/9 (Left EGR positioner).
- Measure direct voltage with multimeter between sockets (Y27/9x1) 3 and (Y27/9x1) 2
- Switch on ignition.
Specified value

- Voltage[11...14V]
Question

- Is the measurement value OK?







YES

Test 2.5.1.1: Test signal cable to component N3/9 (CDI control unit).

2.5.1.1. Test signal cable to component N3/9 (CDI control unit).
Special tools

- Test cable 271 589 00 63 00
- Socket box 129 589 00 21 00
Test sequence

- Switch off ignition.
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket (1.90) 90 of the 126-pole socket box tester and (Y27/9) 1
Specified value

- Resistance <1 Ohm?
Question

- Is the measurement value OK?


YES
The measurement value is OK.If faults with high fault frequency counters or customer complaints are stored, inspect cables and plug connections between control module N3/9 (CDI control unit) and component Y27/9 (Left EGR positioner) for loose contact and corrosion.Replace component Y27/9 (Left EGR positioner).End of test

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

- Test cables and connections, rectify any short circuit.
End of test

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

- Test wiring of voltage supply between component Y27/9 (Left EGR positioner) and component N3/9 (CDI control unit).
End of test