1.2. Check power supply of component B4/7 (Fuel pressure sensor).
Test prerequisite
- The actual value is not o.k.
Test sequence
- Switch off ignition.
- Unplug connector of pressure sensor B4/7 (Fuel pressure sensor).
- Measure direct voltage with multimeter between sockets (B4/7) 3 and (B4/7) 1
- Switch on ignition.
Specified values
- Voltage : [4.8 ... 5.3] V
Question
- Is the measurement value OK?
YES
The measurement value is OK.Further possible causes of fault
- Inspect plug connections for corrosion, pinched insulation and loose contact.
End of test
NO
The measurement value is not OK.Possible cause and remedy
- Test wiring of voltage supply between component N118 (Fuel pump control module) and component B4/7 (Fuel pressure sensor).
- Inspect plug connections for corrosion, pinched insulation and loose contact.
End of test
1.3. Test wiring to component B4/7 (Fuel pressure sensor).
Test prerequisite
- The actual value is not o.k.
Test sequence
- Switch off ignition.
- Unplug 8-pin connector from control module N118 (Fuel pump control module).
- Disconnect connector at component B4/7 (Fuel pressure sensor).
Open circuit
- (N118) 2.Measure resistance with multimeter between sockets 6 and 3 (B4/7)
- (N118) 2.Measure resistance with multimeter between sockets 7 and 2 (B4/7)
- (N118) 2.Measure resistance with multimeter between sockets 8 and 1 (B4/7)
- Specified values
- Resistors< 1ohms
-
Short circuit
- Test cable to component B4/7 (Fuel pressure sensor) for short circuit to each other.
- N118.2.6
- N118.2.7
- N118.2.8
- Specified values
- Resistorsinfiniteohms
