P0105

B28 (Pressure sensor) (P0105)

Test 1: Check component B28 (Pressure sensor).

1. Check component B28 (Pressure sensor).

Test 1.1: Check component B28 (Pressure sensor) using actual value.

Test 1.2: Check power supply of component B28 (Pressure sensor).

Test 1.3: Test signal voltage of component B28 (Pressure sensor).

1.1. Check component B28 (Pressure sensor) using actual value.
Test sequence

- Switch on ignition.
Status of relevant actual value:
- Intake manifold pressure:Warning! Communication with ECU required.
Specified values

- Intake manifold pressure,Ignition ON: [-50...-30] hPa
- Intake manifold pressure,Operate engine at idling speed.: [300...450] hPa
Question

- Is the actual value o.k.?


YES
The actual value is okay.End of test

NO
The actual value is not o.k.Possible cause and remedy

- Check power supply of component B28 (Pressure sensor).
- Test signal voltage of component B28 (Pressure sensor).
Further possible causes of fault

- Vacuum line


1.2. Check power supply of component B28 (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.
- Detach coupling at component B28 (Pressure sensor).
- Measure direct voltage with multimeter between sockets (B28) 1 and (B28) 3
- Switch on ignition.
Specified value

- Voltage[4.75...5.25] V
Question

- Is the measurement value OK?







YES
The measurement value is OK.Further possible causes of fault

- Test signal voltage of component B28 (Pressure sensor).


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

- Lines to component N3/10 (ME-SFI [ME] control unit)
- N3/10 (ME-SFI [ME] control unit)
End of test

1.3. Test signal voltage of component B28 (Pressure sensor).
Figure legend

- 019Vacuum tester
- aY distributor
- B28 (Pressure sensor)
Test prerequisite

- The power supply of component B28 (Pressure sensor) is OK.
Test sequence

- Switch off ignition.
- Connect vacuum tester to component B28 (Pressure sensor).
- Connect socket box (35-pin) to component N3/10 (ME-SFI [ME] control unit).
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Measure direct voltage with multimeter between socket (5.5) 5 of the 35-pole socket box tester and socket (3.22) 55 of the 126-pole socket box tester.
Specified values

- Ignition ON: >3,5 V
- Engine at idle(Vacuum> 500 mbar):< 2 V
Question

- Are the measurement values OK?







YES
The measurement values are OK.End of test

NO
The measurement values are not OK.Possible cause and remedy

- Lines to component B28 (Pressure sensor)
- B28 (Pressure sensor)
Further possible causes of fault

- Vacuum line
End of test