Manufacturer Code Charts: 105100

Component Y85 (Exhaust gas recirculation cooler bypass switchover valve) has Short circuit to ground.

Test 1: Check component Y85 (Exhaust gas recirculation cooler bypass switchover valve).

Test 2: Possible cause:

- Y85 (Exhaust gas recirculation cooler bypass switchover valve)
Affected functions:

- Power generation

1. Check component Y85 (Exhaust gas recirculation cooler bypass switchover valve).

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

Test 1.2: Check vacuum supply of component Y85 (EGR [AGR] cooler bypass flap switchover valve).

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

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

- WIS is not available on this system.
- It is not possible to display the requested WIS document [ gf1420p2022tg ].
- You can start WIS on another system and display the WIS document by entering the document number [ gf1420p2022tg ] in the 'Contents' field.


1.1. No further information available.


1.2. 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 Picture 1

- 019Vacuum tester201 589 13 21 00
- a Vacuum line from component Vacuum pump to component A7/7 (Brake booster)
- b Vacuum fitting for auxiliary consumers
Figure legend Picture 2

- 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 b.
- Engine at idle
Specified value

- Pressure >700 mbar after approx. 30 s
Question

- Is the measurement value OK?













YES
Check vacuum supply of component Y85 (EGR [AGR] cooler bypass flap switchover valve).
Figure legend Picture 1

- 019Vacuum tester201 589 13 21 00
- a Vacuum line from component Vacuum pump to component A7/7 (Brake booster)
- b Vacuum fitting for auxiliary consumers
Figure legend Picture 2

- 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 b.
- Disconnect vacuum hose from connection 3 of component Y85 (Exhaust gas recirculation cooler bypass switchover valve).
- Engine at idle
- Actuate component Y85 (Exhaust gas recirculation cooler bypass switchover valve) by pressing button ON.
- Do not actuate component Y85 (Exhaust gas recirculation cooler bypass switchover valve) by pressing button OFF.
Specified value

- During actuation of component Y85 (Exhaust gas recirculation cooler bypass switchover valve), the vacuum must be < 200 mbar.
- If component Y85 (Exhaust gas recirculation cooler bypass switchover valve) is not actuated, the vacuum must be > 700 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

1.3. 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.17) 17 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

2. No further information available.