Fuel Pump Relay Control
- With ignition off, remove fuel pump relay from fuse/relay panel. Connect voltmeter between relay terminals No. 48 and 50. See Fig 1
. Voltmeter should indicate battery voltage.
Courtesy of AUDI OF AMERICA, INC.
- Repair circuit if reading is not as specified. Connect voltmeter between relay terminals No. 46 and 50. Turn ignition on. Voltmeter should indicate battery voltage.
- If reading is not as specified, repair break in wiring. Connect voltmeter between relay terminals No. 46 and 47. Momentarily engage starter and note reading on voltmeter. Reading should be 7 volts.
- If reading is not 7 volts, remove ICU harness connector. Using an ohmmeter, measure resistance between ICU terminal No. 3 and relay terminal No. 49 and between ICU terminal No. 14 and relay terminal No. 47.
- Readings should be less than .2 ohm. If readings are not as specified, repair open in circuit(s). If readings are as specified, replace knock sensor.
Courtesy of AUDI OF AMERICA, INC.