Checking fuel delivery (of metering pump -V54) — AUDI

Test requirements:

Coolant temperature less than 30°C
Ambient temperature less than 20°C
Fault memory interrogated =>Page
01-38
and any faults displayed located and eliminated

Note:

A higher ambient temperature can result in incorrect delivery measurements on account of fuel evaporation.

Battery -A OK and adequately charged
Sufficient fuel in tank (fuel gauge in dash panel insert not in red zone)

Checking:

Switch off ignition.
Remove noise insulation and front bumper (on vehicles with 6 or 8-cyl. engine).

=> General body repairs, Exterior; Repair group 63; Front bumper
General body repairs, Exterior
Front bumper

Detach fuel pipe -A- from auxiliary heater.
Use piece of wire, for example, to secure graduated beaker -B- in area of fuel pipe and hold fuel pipe over beaker.

Note:

If necessary, use hose -C- as extension to fuel pipe.

Start auxiliary heater self-diagnosis and select "Basic setting" function=>Page
01-65
.

Rapid data transfer
Q
04 - Starting basic setting
Indicated on display:

Confirm entry with Q key.

Start basic setting
HELP
Enter display number XXX
Indicated on display:

Enter display group number 055.
Confirm entry with Q key.

System in basic setting
55
⇒
Pipe filling
Indicated on display:

Notes:

Metering pump -V54 is now actuated for 50 s (clock frequency 5 Hertz).
"Pipe filling" function is to be performed 3 times. Pipe is completely filled during first run; second and third runs are used to measure delivery (on account of low delivery rate 2 runs of 50 s each are required to increase measurement accuracy).

System in basic setting
55
⇒
END
Wait until the following display appears:

Empty graduated beaker and re-attach.
⇒ key is to be pressed.

Rapid data transfer
HELP
Select function XX
Indicated on display (function selection):

Press keys -0- and -4- to select "Basic setting" function 04.

Rapid data transfer
Q
04 - Starting basic setting
Indicated on display:

Confirm entry with Q key.

Start basic setting
HELP
Enter display number 055
Indicated on display:

Enter display group number 055.
Confirm entry with Q key.

System in basic setting
55
⇒
Pipe filling
Indicated on display:

Note:

Metering pump -V54 is now actuated for 50 s (clock frequency 5 Hertz).

System in basic setting
55
⇒
END
Wait until the following display appears:

⇒ key is to be pressed.

Rapid data transfer
Q
04 - Starting basic setting
Indicated on display:

Confirm entry with Q key.

Start basic setting
HELP
Enter display number 055
Indicated on display:

Enter display group number 055.
Confirm entry with Q key.

System in basic setting
55
⇒
Pipe filling
Indicated on display:

Note:

Metering pump -V54 is now actuated for 50 s (clock frequency 5 Hertz).

System in basic setting
55
⇒
END
Wait until the following display appears:

⇒ key is to be pressed.

Note:

To achieve a more accurate measurement result, metering pump -V54 has to be actuated for 100 s (2x implementation of "Pipe filling" function).

Measure metering pump fuel delivery on completion of second pipe filling run.

Specification:

29 to 35 cm3 (millilitres)

Notes:

During this test, fuel delivery is not governed by instantaneous battery voltage (delivery is stabilised by control unit -J162).
There must not be any inclusion of vapour bubbles.
If fuel delivery is outside tolerance range:
Check fuel pipe for damage and correct routing => Page
82-76
.
If no fault is found, replace metering pump -V54 => Page
82-102
.

If starting problems are encountered with auxiliary heater although fuel delivery is OK, check CO2 level in exhaust gas => Page
82-104
.