Purge Control System Has A Slight Leak (Minor Leak) : Leak In Hose Connection or Shutoff Valve of Activated Charcoal Canister

Purge Control System Has A Slight Leak (Minor Leak) : Leak In Hose Connection or Shutoff Valve of Activated Charcoal Canister (P0456)

Test 1 Check Component B4/3 (Fuel Tank Pressure Sensor). (Only (USA))
Test 2 Check Component Y58/1 (Purge Control Valve).


1 Check Component B4/3 (Fuel Tank Pressure Sensor). (Only (USA))

Test 1-1 Test Component B4/3 (Fuel Tank Pressure Sensor) By Actuation.
Test 1-2 Test Voltage Supply of Component B4/3 (Fuel Tank Pressure Sensor).


1-1 Test Component B4/3 (Fuel Tank Pressure Sensor) By Actuation.





Figure legend
- 019 Vacuum tester
- b Purge line from activated charcoal canister to component Y58/1 (Purge control valve)
- Y58/1 (Purge control valve)

Test sequence
- Switch off ignition.
- Detach purge line to activated charcoal filter at component Y58/1 (Purge control valve) and connect vacuum tester to purge line.
- Switch on ignition.
- Actuate component Y58/4 (Activated charcoal canister shut-off valve).(Operate pushbutton F2.)

Note! Communication with ECU required.

** End of Test **


1-2 Test Voltage Supply of Component B4/3 (Fuel Tank Pressure Sensor).

Test requirement
- The actual value is not o.k.
- The voltage supply of the component N3/10 (ME-SFI control module) is o.k..

Test sequence
- Switch off ignition.
- Connect socket box (35-pin) to component N3/10 (ME-SFI control module).
- Connect socket box (126-pin) to component N3/10 (ME-SFI control module).
- (5.5) Pin 5 of 35 <--> Pin 125 of 126 (4.40)
- Switch on ignition.

Specified value
- Voltage[4.75...5.25] V

Question
- Is the measured value okay?
Yes
The measured value is o.k.
Further possible causes of fault
- Inspect cables from component N3/10 (ME-SFI control module) to component B4/3 (Fuel tank pressure sensor).
- B4/3 (Fuel tank pressure sensor)
No
The measured value is not o.k.
Possible cause and remedy
- Inspect cables from component N3/10 (ME-SFI control module) to component B4/3 (Fuel tank pressure sensor).
- N3/10 (ME-SFI control module)

** End of test **


2 Check Component Y58/1 (Purge Control Valve).

Test 2-1 Actuate Component Y58/1 (Purge Control Valve).
Test 2-2 Test Current Consumption of Component Y58/1 (Purge Control Valve).
Test 2-3 Perform Mechanical Inspection of Component Y58/1 (Purge Control Valve).
Test 2-4 Test Signal Voltage of Component Y58/1 (Purge Control Valve).


2-1 Actuate Component Y58/1 (Purge Control Valve).

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

Note: Component M4/3 (engine/AC electric suction fan) runs with an on/off ratio of 50 % during the actuations for safety reasons.

Note! Communication with ECU required.


2-2 Test Current Consumption of Component Y58/1 (Purge Control Valve).

Test requirement
- Actuation is not okay.

Test sequence
- Switch off ignition.
Connect socket box.
- (5.7) 7 <--> 2 (5.2)
- Switch on ignition.

Specified value
- Amperage[0.4...0.6] A

Question
- Is the measured value okay?
Yes
The measured value is o.k.
Further possible causes of fault
- Perform mechanical inspection of component Y58/1 (Purge control valve).
No
The measured value is not o.k.
Possible cause and remedy
- Voltage supply of component Y58/1 (Purge control valve)(Wiring diagrams)
- Inspect cables from component N3/10 (ME-SFI control module) to component Y58/1 (Purge control valve).
- Y58/1 (Purge control valve)

** End of Test **


2-3 Perform Mechanical Inspection of Component Y58/1 (Purge Control Valve).





Figure legend
- 019 Vacuum tester
- a 3-point distributor
- b Vacuum line to activated charcoal canister
- Y58/1 (Purge control valve)

Test requirement
- Actuation is o.k.

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.

Note! Communication with ECU required.


2-4 Test Signal Voltage of Component Y58/1 (Purge Control Valve).

Test requirements
- Engine at operating temperature

Test sequence
- Switch off ignition.
- Connection Measuring system
- A4 Blue socket <--> Green socket A7
- Operate engine at idling speed.

Status of relevant actual value:
- Temperature of coolant: Communication with ECU required

Note
- Measuring system: Continue with key F2

** End of Test **