relay AUDI A4 1999 B5 / 1.G ATQ Engine Motronic Injection System Servicing User Guide
Page 65 of 78
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- Connect multimeter for voltage measurement to
Ground (GND) and to one terminal of the
following fuses in the fuse holder.
Fuse
Specified value at one of the
terminals
S228 approx. battery voltage
S229 approx. battery voltage
S234 approx. battery voltage
If specified values are not obtained:
- Repeat test at another terminal of fuse socket.
If specified values are not obtained again:
- Check wire connections.
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder If no malfunctions are detected:
- Replace Fuel Pump (FP) relay -J17-.
- Re-insert the fuses.
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Page 73 of 78
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Voltage supply for Mass Air Flow (MAF)
sensor, checking
- Disconnect connector from Mass Air Flow (MAF)
sensor.
Note:
Voltage is supplied to Mass Air Flow (MAF) sensor from Fuel Pump (FP)
relay.
If specified value is not obtained:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder - Connect multimeter for voltage measurement as follows.Harness connector
Terminal
Measure to
3 Engine Ground (GND)
- Operate starter briefly.
Specification: approx. battery voltage
- Check wire connection from terminal 3 of connector to Fuel Pump (FP)
relay via fuse for open circuit and short circuit to Ground (GND):
Pa
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jection s
ystem, servicin
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