P0443

Y58/1 (Purge control valve) : Short circuit to positive / Switchover valve permanently closed (P0443)


Possible cause:

- Y58/1 (Purge control valve)
Affected functions:

- Engine diagnosis

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Test 1: Check component Y58/1 (Purge control valve).

1. Check component Y58/1 (Purge control valve).

Test 1.1: Actuate component Y58/1 (Purge control valve).

Test 1.2: Test current consumption of component Y58/1 (Purge control valve).

Test 1.3: Perform mechanical inspection of component Y58/1 (Purge control valve).

1.1. Actuate component Y58/1 (Purge control valve).
Test sequence

- Switch on ignition.
- Actuate component Y58/1 (Purge control valve).(Operate pushbutton F2.)


Warning!Communication with ECU required.


1.2. Test current consumption of component Y58/1 (Purge control valve).
Figure legend

- A -ConnectionTest cable 35-pin socket box
- 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
- 05 -35-pin socket box
- 050 -126-pin socket box
- 108 -Test cable 266 589 01 63 00
- N3/10 (ME-SFI [ME] control unit)
- II 1-63ConnectionTest cable
- III 64-126ConnectionTest cable
Warning!

-
- Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).







Test prerequisite

- Actuation is not OK.
Test sequence

- Switch off ignition.
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Connect socket box (35-pin) to component N3/10 (ME-SFI [ME] control unit).
- Measure direct current with multimeter between socket [F.4] 100 of the 126-pole socket box tester and socket [F.45] 15 of the 35-pole socket box tester.
- Switch on ignition.
Specified value

- Amperage[0.4...0.9] A
Question

- Is the measurement value OK?


YES
The measurement value is OK.Possible cause and remedy

- Perform mechanical inspection of component Y58/1 (Purge control valve).
End of test

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

- K40/4f44 (Fuse 44)
- K40/4kM (Circuit 30z relay)
- Line from component N3/10 (ME-SFI [ME] control unit) to component Y58/1 (Purge control valve)
- Line from component K40/4 (Front passenger fuse and relay module) to component Y58/1 (Purge control valve)
- Y58/1 (Purge control valve)
End of test







1.3. Perform mechanical inspection of component Y58/1 (Purge control valve).
Figure legend

- 019Vacuum tester
- a3-point distributor
- bVacuum line to activated charcoal canister
- Y58/1 (Purge control valve)
Test prerequisite

- Actuation is OK.
Test sequence

- Switch off ignition.
- Connect the vacuum tester to the input of component Y58/1 (Purge control valve) with the 3 x distributor.
- Operate engine at idling speed.
- Engine at operating temperature
- Actuate component Y58/1 (Purge control valve), then with key F2.
Specified value

- Component Y58/1 (Purge control valve) should pulse.
- The value should be > 5 mbar during actuation.The pointer of the vacuum tester swings.
Proceed to 'Actuation' with F2







Warning!Communication with ECU required.