Manufacturer Code Charts: 2594

[1] Check component Y93 (Exhaust flap switchover valve).: Short circuit to positive

Test 1: Check component Y85 (EGR [AGR] cooler bypass flap switchover valve).

1. Check component Y85 (EGR [AGR] cooler bypass flap switchover valve).

Test 1.1: Function description 'Y85 (EGR [AGR] cooler bypass flap switchover valve)'

Test 1.2: Check component Y85 (EGR [AGR] cooler bypass flap switchover valve) by means of actuation.

Test 1.3: Check vacuum supply of component Y85 (EGR [AGR] cooler bypass flap switchover valve).

Test 1.4: Power supply Check component Y85 (EGR [AGR] cooler bypass flap switchover valve).

1.1. Function description 'Y85 (EGR [AGR] cooler bypass flap switchover valve)'
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1.1. No further information available.


1.2. Check component Y85 (EGR [AGR] cooler bypass flap switchover valve) by means of actuation.
Figure legend/figure1

- Y85 (EGR [AGR] cooler bypass flap switchover valve)
Figure legend/figure2

- B90 (EGR [AGR] cooler bypass flap Hall sensor)
Test prerequisite

- Operate engine at idling speed.
Explanation of the following test

- The switchover valve is opened by pressing button F3.
- Component B90 (EGR [AGR] cooler bypass flap Hall sensor) then indicates status 'Bypass flap open'.
Move on to actuation with button F2













Warning!Communication with ECU required.


1.3. Check vacuum supply of component Y85 (EGR [AGR] cooler bypass flap switchover valve).
Check vacuum supply of component Y85 (EGR [AGR] cooler bypass flap switchover valve).
Figure legend

- Y85 (EGR [AGR] cooler bypass flap switchover valve)
- 1Air admission
- 2Vacuum supply from vacuum pump
- 3Output
Special tool

- Vacuum tester201 589 13 21 00
- Y distributor117 078 01 45
Test sequence

- Connect vacuum tester 201 589 13 21 00 with Y distributor to connection 2.
- Engine at idle
Specified value

- Pressure >700 mbar after approx. 30 s
Question

- Is the measurement value OK?







YES
Check vacuum supply of component Vacuum unit for 'EGR cooler' bypass flap.
The measurement value is OK.Test sequence

- Connect vacuum tester 201 589 13 21 00 with Y distributor to connection 3.
- Operate engine at idling speed.
- Actuate component Y85 (EGR [AGR] cooler bypass flap switchover valve).
Specified value

- Pressure:>400 mbar
Move on to actuation with button F2







Warning!Communication with ECU required.


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

- Inspect pneumatic lines for leaks.
- Test electrical accessories.
- Check component A7/7 (BAS brake booster).
- Check component Vacuum pump.
End of test

1.4. Power supply Check component Y85 (EGR [AGR] cooler bypass flap switchover valve).
Power supply Check component Y85 (EGR [AGR] cooler bypass flap switchover valve).
Figure legend

- Y85 (EGR [AGR] cooler bypass flap switchover valve)
Special tool

- Adapter cable220 589 00 99 34
Test sequence

- Switch off ignition.
- Detach coupling at component Y85 (EGR [AGR] cooler bypass flap switchover valve).
- Connect adapter cable no. 220 589 00 99 34 to engine wiring harness Y85 (EGR [AGR] cooler bypass flap switchover valve).
- Measure direct voltage with multimeter between ground and socket (Y85x1) 2
- Switch on ignition.
Specified value

- Voltage[11...14] V
Question

- Is the measurement value OK?







YES
Test signal line between components N3/9 (CDI control unit) and Y85 (EGR [AGR] cooler bypass flap switchover valve) for Open circuit.
Figure legend

- Y85 (EGR [AGR] cooler bypass flap switchover valve)
Special tools

- Test cable 266 589 01 63 00
- Socket box 129 589 00 21 00
Test sequence

- Switch off ignition.
- Unplug connector of control module and component.
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket (M.12) 12 of the 126-pole socket box tester and socket (Y85x1) 1
Specified value

- Resistor< 1ohms
Question

- Is the measurement value OK?







YES
Check internal resistance of component Y85 (EGR [AGR] cooler bypass flap switchover valve).
The measurement value is OK.Figure legend

- Y85 (EGR [AGR] cooler bypass flap switchover valve)
Test sequence

- Switch off ignition.
- Connect adapter cable no. 220 589 00 99 34 at component Y85 (EGR [AGR] cooler bypass flap switchover valve).
- Test resistance.
- Measure resistance with multimeter between sockets (Y85) 1 and (Y85) 2
Specified value

- Resistor[28...32]ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.End of test

NO
The measurement value is not OK.Replace component Y85 (EGR [AGR] cooler bypass flap switchover valve).End of test

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

- Test lines between components N3/9 (CDI control unit) and Y85 (EGR [AGR] cooler bypass flap switchover valve) for Open circuit.
End of test

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

- Test lines between components N3/9 (CDI control unit) and Y85 (EGR [AGR] cooler bypass flap switchover valve) for Open circuit.
End of test