[1] Check component B28/8 (Pressure differential sensor (DPF)).: Value is above limit.

[1] Check component B28/8 (Pressure differential sensor (DPF)).: Value is above limit.

Test 1: Check component B28/8 (Pressure differential sensor (TWC [KAT])).

1. Check component B28/8 (Pressure differential sensor (TWC [KAT])).
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

- Are the read-out values OK?


YES
The actual value is okay.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.Check hose lines from particulate filter to component B28/8 (Pressure differential sensor (DPF)) for kinks or chafing.Plausibility error due to defective hose linesEnd of test

NO
Voltage supply of component B28/8 (Pressure differential sensor (DPF))
Special tool

- Adapter cable611 589 03 63 00
Figure legend/figure

- B28/8 (Pressure differential sensor (DPF))
Test prerequisite

- The actual value is not o.k.
Test prerequisite

- Switch off ignition.
- Detach coupling at component B28/8 (Pressure differential sensor (TWC [KAT])).
- Connect adapter cable no. 611 589 03 63 00 at component 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...5,2V]
Question

- Is the measurement value OK?







YES
Signal cable of component B28/8 (Pressure differential sensor (DPF))
Figure legend/figure

- B28/8 (Pressure differential sensor (DPF))
Special tools

- Test cable 271 589 00 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 [1.58] 58 of the 126-pole socket box tester and socket [B28/8x1] 1
Specified value:

- Resistance <1 Ohm?
Question

- Is the measurement value OK?







YES
The measurement value is OK.Plausibility error due to defective hose linesEnd of test

NO
The measurement value is not OK.Test signal line between components N3/9 (CDI control unit) and B28/8 (Pressure differential sensor (DPF)) for Open circuit.End of test

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

- Test lines between components N3/9 (CDI control unit) and B28/8 (Pressure differential sensor (DPF)) for Open circuit.


1. No further information available.