Manufacturer Code Charts: 1915

B28 (Pressure sensor) : Implausible value (P0106)


Possible cause:

- B28 (Pressure sensor)
Affected functions:

- Engine diagnosis
- Engine output

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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:
- Coolant temperature:Warning! Communication with ECU required.

- Intake manifold pressure (ADC):Warning! Communication with ECU required.
Specified values

- Coolant temperature > 80° C
- Intake manifold pressure,Ignition ON: > 3.5 V
- Intake manifold pressure,Operate engine at idling speed.:< 2 V
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).
Figure legend

- B28 (Pressure sensor)
- 126/1 -'Secondary air injection left bank of cylinders' shutoff valve
Test prerequisite

- The actual value is not o.k.
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)
End of test

1.3. Test signal voltage of component B28 (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).
Continue to test with button F2







Figure legend

- B28 (Pressure sensor)
- 126/1 -'Secondary air injection left bank of cylinders' shutoff valve
Test prerequisite

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

- Switch off ignition.
- Connect the vacuum tester to the input of component B28 (Pressure sensor) with the 3 x distributor.
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Measure direct voltage with multimeter between sockets [ M.15 ] 15 and [ M.86 ] 86 of the 126-pole socket box tester.
- Switch on ignition.
Specified values

- Ignition ON: >3.5 V
- Operate engine at idling speed.(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