ME2.7.2(AMG)

Purge control system has leak (function chain) (P0440)


Possible cause:

- Y58/1 (Purge control valve)
- B4/3 (Fuel tank pressure sensor)
Affected functions:

- Fuel system

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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).
Test prerequisite

- Fuse N10/1f23 (Fuse 23) is OK.
- The actuation was not okay.
Test sequence

- Switch off ignition.
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Measure direct current with multimeter between sockets (3.4) 37 and (4.32) 117 of the 126-pole socket box tester.
- Switch on ignition.
Specified value

- Amperage (0.35 ...0.60) A
Question

- Is the measurement value OK?


YES
The measurement value is OK.Possible cause and remedy

- Y58/1 (Purge control valve)
End of test

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

- Voltage supply of component Y58/1 (Purge control valve)(<->Wiring diagrams)
- Check lines from component N3/10 (ME-SFI [ME] control unit) 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
- 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.







Warning!Communication with ECU required.