P0452

Tank pressure sensor diagnosis : Short circuit to ground (P0452)


Possible cause:

- B4/3 (Fuel tank pressure sensor)
Affected functions:

- Engine diagnosis

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Test 1: Check component B4/3 (Fuel tank pressure sensor). ( 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.
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).(Operate pushbutton F2.)







Warning!Communication with ECU required.

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

- 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 [ F.9 ] 105 and [ F.22 ] 118 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.Further possible causes of fault

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