S4 V8-4.2L (BHF) (2004)
-
Fuel Pump (FP) relay (at position 4 of central electronics in driver's footwell, left) must trigger and Fuel Pump (FP) must run.
A. If Fuel Pump (FP) runs:
-
Check voltage supply of Fuel Pump (FP) relay
-
Checking activation of Fuel Pump (FP) relay
B. If Fuel Pump (FP) does not run:
-
Check voltage supply for Fuel Pump (FP) and components (via Fuel Pump -FP- relay)
Check voltage supply of Fuel Pump (FP) relay
-
Remove Fuel Pump (FP) relay.
-
Connect multimeter for voltage measurement as follows.
Central electronics in driver-side
Measure to
footwell, left, position 4
Terminal
17
Ground (GND)
Specified value: approx. battery voltage
If specified value is not obtained:
-
Replace central electronics.
-
Connect multimeter for voltage measurement as follows.
Central electronics in driver-side
Measure to
footwell, left, position 4
Terminal
19
Ground (GND)
-
Switch ignition on.
-
Specified value: approx. battery voltage
-
Switch ignition off.
If specified value is not obtained:
-
Check wire connections for open circuit according to wiring diagram.
-
Specified value: Wire resistance max 1.5 Ohms
If specified values are obtained: