[1] Check component B28/8 (Pressure differential sensor (DPF)).: Open circuit in wiring / Short circuit to positive

[1] Check component B28/8 (Pressure differential sensor (DPF)).: Open circuit in wiring / Short circuit to positive

Test 1: Check component B28/8 (Pressure differential sensor (DPF)).

1. Check component B28/8 (Pressure differential sensor (DPF)).
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.
Note

- Fault indicates open circuit in ground cable.
Test prerequisite

- 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 (F.10) 106 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)).
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