AUDI A4 1997 B5 / 1.G AFC Engine Fuel Pump Relay And Relay Triggering Checking Workshop Manual

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Fuel pump relay and relay
triggering, checking

The fuel pump relay is located at position 6 of the central electrical panel
under the left side of the instrument panel.
Checking fuel pump relay -J17-
- Remove shelf in left front footwell.

- Remove fuses 28, 29 and 34 from fuse relay panel.
- Connect VAG 1527B voltage tester between Ground (GND) and either
of the fuse 28 terminals using jumper wires from the connector test kit
VW 1594.
- Briefly operate starter.
Fuel pump relay must be felt and heard ("click") Voltage tester must light up
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If fuel pump relay does not operate:

- Check triggering page 24
-27
.
If voltage tester does not light up:

- Repeat test on other terminal for fuse 28.
If voltage tester still does not light up:

- Check fuse 28 wiring to terminal 30 (relay position 6), repair as
necessary.

- Connect voltage tester between Ground (GND) and each terminal of
fuse 29, in sequence.
- Use scan tool "Output Diagnostic Test Mode" function 03 to trigger fuel
pump relay -J17- Repair Group 01.
Fuel pump relay must be felt and heard ("click") Voltage tester must light up
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If voltage tester does not light up:
- Repeat test on the other terminal for fuse 28.
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If voltage tester still does not light up:

- Check fuse 29 wiring for continuity to terminal 30 (relay position 6)
using wiring diagram, correct as necessary.

If the voltage tester does not light up - Connect voltage tester between Ground (GND) and either terminal for
fuse 34.
- Use scan tool "Output Diagnostic Test Mode" function 03 to trigger fuel
pump relay -J17- Repair Group 01.
Fuel pump relay must be felt and heard ("click") Voltage tester must light up
- Repeat the check using the other fuse 34 terminal.
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If the voltage tester still does not light up:

Checking voltage supply
If the specified values are not obtained:
Checking fuel pump relay triggering - Check wiring for continuity between fuse 34 and terminal 31 (relay
position 6) using wiring diagram, correct as necessary.
- Remove fuel pump relay -J17- from the fuse relay panel, relay position
6.
- Switch ignition ON.
- Connect multimeter (Fluke 83 or equivalent) between sockets 28 (B+)
and 34, then between sockets 32 (B+) and 34.
Specified value: approx. battery positive voltage (B+)
- Check for open circuit using wiring diagram, correct as necessary.

Note:
Only by operating the starter is it possible to make the voltage tester LED
go out, otherwise it will appear dimly lit (due to low current draw). - Connect voltage tester between sockets 28 (B+) and 29.
Voltage tester must light up for approx. 1 second and then go out.
Tester must stay lit while operating starter.
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If voltage tester does not light up, check wiring as
follows:

If the specified value is not obtained:
If the wiring is OK and the voltage tester does not light up:
If the fuel pump relay triggering and the wiring is OK: - Connect VAG 1598/19 test box to ECM harness connector (ECM is left
disconnected) Repair Group 01. -
Switch multimeter (Fluke 83 or equivalent) to measure resistance ( )
and check for continuity between relay socket 29 and test box socket
A5 using jumper wires from connector test kit VW 1594.
Specified value: max. 1 - Check for open circuit using wiring diagram, and correct as necessary.
- Replace ECM Repair Group 01.- Replace the fuel pump relay.
- Re-insert the removed fuses.
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