Manufacturer Code Charts: 170500
The efficiency of the diesel particulate filter (cylinder bank 1) is not sufficient.
Possible cause:
- Diesel particulate filter
- B28/8 (Differential pressure sensor (DPF))
Affected functions:
- Power generation
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Test 1: Check component B28/8 (Pressure differential sensor (DPF)).
Test 2: Check component Diesel particulate filter.
1. Check component B28/8 (Pressure differential sensor (DPF)).
Check actual value B28/8 (Pressure differential sensor (DPF)).
Test prerequisite
- Ignition ON
- The air extractor system may not be connected to the exhaust system during the test.
Status of the relevant actual values:
- Coolant temperature:Warning! Communication with ECU required.
- Differential pressure Signal voltage:Warning! Communication with ECU required.
Specified value at coolant temperature between 10 °C and 85 °C
- Differential pressureSignal voltage464...682 mV
Specified value at coolant temperature < 10 °C or > 85 °C
- Differential pressureSignal voltage428...718 mV
Question
- Is the actual value o.k.?
YES
The actual value is okay.Figure legend
- B28/8 (Pressure differential sensor (DPF))
Further procedure
- Test wiring and plug connections between control module N3/9 (CDI control unit) and B28/8 (Pressure differential sensor (DPF)) for Loose contact, repair or replace if necessary.
End of test
NO
Check power supply of component B28/8 (Pressure differential sensor (DPF)).
Figure legend
- B28/8 (Pressure differential sensor (DPF))
Special tool
- Adapter cable611 589 03 63 00
Test prerequisite
- The actual value is not o.k.
Test sequence
- Switch off ignition.
- Detach coupling at component B28/8 (Pressure differential sensor (DPF)).
- Connect adapter cable no. 611 589 03 63 00 to engine wiring harness B28/8 (Pressure differential sensor (DPF)).
- Measure direct voltage with multimeter between sockets (B28/8x1) 2 and (B28/8x1) 3
- Switch on ignition.
Specified value
- Voltage[4.9...5.2] V
Question
- Is the measurement value OK?
YES
Check signal lines on component B28/8 (Pressure differential sensor (DPF)).
Figure legend
- B28/8 (Pressure differential sensor (DPF))
Special tools
- Test cable 266 589 01 63 00
- Socket box 129 589 00 21 00
- Adapter cable611 589 03 63 00
Test sequence
- Switch off ignition.
- Unplug connector of control module and component.
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket (M.31) 31 of the 126-pole socket box tester and socket (B28/8x1) 1
Specified value
- Resistor<1ohms
Question
- Is the measurement value OK?
YES
The measurement value is OK.Further procedure
- Check signal line of component B28/8 (Pressure differential sensor (DPF)) for short circuit to positive.
- Check signal line of component B28/8 (Pressure differential sensor (DPF)) for short circuit to ground.
- Replace component B28/8 (Pressure differential sensor (DPF)).
Note
- After replacing component B28/8 (Pressure differential sensor (DPF)), the teach-in process for this component must be performed via menu 'Control unit adaptations'.
End of test
NO
The measurement value is not OK.Possible cause and remedy
- Repair or replace faulty cable N3/9 (CDI control unit)- B28/8 (Pressure differential sensor (DPF)).
End of test
NO
The measurement value is not OK.Possible cause and remedy
- Check voltage supply lines of component B28/8 (Pressure differential sensor (DPF)) as per wiring diagram.
End of test
2. Check component Diesel particulate filter.
Important note:Should regeneration be performed due to oil loss (e.g. in turbocharger) or is oil present in the exhaust system?Note:Any oil present in the exhaust system burns due to the increased temperatures during diesel particulate filter regeneration. This can cause heavy smoke formation.If an oil loss is known of, regeneration may not be started manually.
YES
Replacement of component Diesel particulate filter
Important note:Burnt oil can hinder visibility for the following traffic.For this reason, regeneration of the diesel particulate filter may not be performed.Further procedure
- Make a printout of the following screen page.
- Replacement of component Diesel particulate filter
- Diesel particulate filterNewInitializing
End of test
NO
Special functions
Please enter the password:
2. No further information available.