fuel pump AUDI A8 1998 D2 / 1.G AHA Engine On Board Diagnostic Workshop Manual

Battery Positive Voltage (B+) OK (at least 11
volts)
Engine and transmission GND connections
OK Electrical Wiring Diagrams,
Troubleshooting & Component Locations
binder

Fuel pump relay OK
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01-44

Diagnostic Trouble Code
(DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P1500 17908 Fuel Pump Relay Circ.
Electrical Malfunction Immed.
- Check fuel pump relay and relay actuation page 24
-95

P1501 17909 Fuel Pump Relay Circ.
Short to Ground
P1502 17910 Fuel Pump Relay Circ.
Short to B+
P1505 17913 Closed Throttle Pos. Switch
Does Not Close/Open Circ. 2 Dcy
- Check throttle body and throttle valve control
module page 24
-128

P1512 17920 Intake Manifold Changeover
Valve Circ.
Short to B+ Immed.
- Check Intake Manifold Tuning (IMT) valve (change-
over valve) page 24
-154

P1515 17923 Intake Manifold Changeover
Valve Circ.
Short to Ground

P1516 17924 Intake Manifold Changeover
Valve Circ.
Open
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01-51

Output Diagnostic Test Mode (DTM)
(scan tool function 03)


Notes:

The output Diagnostic Test Mode (DTM) can be
activated only with ignition switched on and the
engine not running.
The output DTM is interrupted if the engine is
started, or if a rotary pulse from the ignition
system is recognized.
When operating in the output DTM, the
individual output signals are actuated until the
program sequence is advanced by pressing the
button.

Output signals are checked by listening for the
sound of the component being actuated, or
feeling for mechanical evidence of actuation,
such as clicking, vibration, etc.
Without letting the engine run, briefly switch the
ignition off for approx. 20 seconds before
repeating the output checks.
During the entire output DTM sequence, the
electric fuel pump will run.
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01-52
The following components are actuated in
sequence:

1. Cylinder 1 fuel injector -N30-
2. Cylinder 2 fuel injector -N31-
3. Cylinder 3 fuel injector -N32-
4. Cylinder 4 fuel injector -N33-
5. Cylinder 5 fuel injector -N83-
6. Cylinder 6 fuel injector -N84-
7. EVAP canister purge regulator valve -N80-
8. Secondary AIR solenoid valve -N112-
9. Secondary AIR pump relay -J299-
10.
Intake manifold tuning valve -N156-
(change-over valve)
11.
Camshaft adjustment 1 (Valves -1- and -2-
for camshaft adjustment, -N205- and -N208-
)

Required special tools and testing
equipment

VAG1551 Scan Tool (ST) with VAG1551/3
adapter cable

Test conditions
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Fuse for Engine Control Module (ECM) OK
Closed Throttle Position (CTP) switch -F60-
OK
Fuel pump relay OK
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01-53

Test sequence

- Connect VAG1551/VAG1552 scan tool and
insert "Engine Electronics" address word 01
(ignition on) page 01
-8 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -3- to select "Output Diagnostic Test Mode"
function 03.
Rapid data transfer
Q
03 - Output Dia
gnostic Test Mode

Indicated on display
Fuel injectors:
- Press -Q- button to confirm input.
Output Diagnostic Test Mode Cylinder 1 Fuel In
jector-N30

Indicated on display
Note:
The fuel pump relay must be activated, the fuel pump must run, and you
must clearly hear the flow of fuel in the fuel pressure regulator. If the fuel
pump does not run, check fuel pump relay and connections page 24
-
95
.
- Operate throttle valve at throttle body.
As soon as the Closed Throttle Position (CTP) switch opens, cylinder 1
fuel injector must be actuated (click) 5 times.
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