ME2.7.1

B4/3 (Fuel tank pressure sensor) , Signal implausible (P0450)

Test 1: Check component B4/3 (Fuel tank pressure sensor). ( Valid for USA )

Test 2: Fuel tank leak test ( Valid for USA )

1. Check component B4/3 (Fuel tank pressure sensor). ( Valid for USA )

Test 1.1: Check component B4/3 (Fuel tank pressure sensor) by means of actuation.

Test 1.2: Check power supply of component B4/3 (Fuel tank pressure sensor).

1.1. Check component B4/3 (Fuel tank pressure sensor) by means of actuation.
Default condition

- Fuel tank level< 90%
Figure legend

- 019Vacuum tester
- bPurge 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).
Note

- Component Y58/4 (Activated charcoal canister shut-off valve) may be actuated for no more than max. 20 min.
Proceed to 'Actuation' with F2







Warning!Communication with ECU required.

1.2. Check power supply of component B4/3 (Fuel tank pressure sensor).
Test prerequisite

- The actual value is not o.k.
- The power supply of component N3/10 (ME-SFI [ME] control unit) is OK.
Test sequence

- Switch off ignition.
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Measure direct voltage with multimeter between sockets [3.4] 37 and [3.6] 39 of the 126-pole socket box tester.
- Switch on ignition.
Specified value

- Voltage[4.7...5.3] V
Question

- Is the measurement value OK?


YES
The measurement value is OK.End of test

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

- Check lines from component N3/10 (ME-SFI [ME] control unit) to component B4/3 (Fuel tank pressure sensor).
- N3/10 (ME-SFI [ME] control unit)
End of test

2. Fuel tank leak test ( Valid for USA )
Warning!Communication with ECU required.