engine AUDI A4 1999 B5 / 1.G AFC Engine Fuel Injectors Checking Workshop Manual
Page 1 of 5
24-29
Fuel injectors, checking
CAUTION!
Fire hazard! Do not smoke, work near heaters
or open flame, or have anything in the area
that could ignite fuel.
Checking resistance
- Disconnect harness connector from fuel injector
to be checked.
Checking voltage supply
Repair Manual, 2.8 Liter V6 2V Engine Mechanical, Engine Code(s): AFC, Repair Group 20
- Measure fuel injector resistance using multimeter (Fluke 83 or
equivalent).
Specified value:
Bosch: 15.0 to 17.0
Siemens: 13.5 to 14.5
- Replace any fuel injector for which resistance measurement does not
fall within specified value.
Fuel pump relay OK page 24
-24
Fuel pump OK:
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Page 3 of 5
24-30
- Disconnect harness connector from fuel injector
to be checked.
If voltage tester does not light up:
If voltage tester does light up:
Checking fuel injector triggering - Connect VAG 1527B voltage tester between harness connector
terminal 1 and Ground (GND).
- Use scan tool "Output Diagnostic Test Mode" function 03 to trigger fuel
pump relay -J17- Repair Group 01. Specified value: voltage tester must light up
- Check wiring between terminal 1 and fuel injector fuse using wiring
diagram.
- Check fuel injector triggering.
- Disconnect harness connector from fuel injector to be checked.
- Connect VAG 1527B voltage tester between terminal 2 and battery
positive voltage (B+) using jumper wires from connector test kit VW
1594.
- Operate starter for several seconds (OK for engine to turn).
Voltage tester must flash
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