1998 AUDI A8 fuel

01-46

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



P1564 17972 Idle Speed Contr. Throttle Pos.
Low Voltage During Adaptation
(Supply voltage under 10 V during adaptation of throttle
valve control module to engine control module.) Off
- Check voltage supply to ECM
page 24
-90

P1565 17973 Idle Speed Contr. Throttle Pos.
Lower Impact Not Attained
(Lower specification not attained during adaptation of
throttle valve control module to engine control module,
e.g., accelerator pedal cable incorrectly adjusted,
throttle body dirty, etc.) 2 Dcy
- Clean throttle body
- Check accelerator pedal cable
adjustment Repair Manual,
Fuel Supply System, Repair
Group 20 P1600 18008 Power Supply (B+) Terminal 15
Low Voltage Immed.
- Check voltage supply to Engine
Control Module (ECM) page
24
-90

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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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01-54
To check remaining fuel injectors:

-
Press button and open the throttle valve
again.
As soon as the Closed Throttle Position (CTP)
switch opens, the applicable fuel injector must
be actuated (click) 5 times.

- Repeat for each fuel injector.
To skip individual tests:

-
Press button to advance through program
sequence. If one or more of the fuel injectors is not
actuated:

- Check fuel injectors page 24
-102
.
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Fuel pressure regulator faulty or hose
disconnected - Check fuel pressure regulator page 24
-111
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01-65

Display field 4
Possible malfunction cause
Corrective action
less than 0 (Not possible) ---
greater than 12

Adaptation of throttle valve control module to
ECM not complete - Check adaptation of throttle valve control
module page 24
-150

greater than 12

Throttle Position (TP) sensor in throttle valve
control module faulty - Check throttle valve control module page 24
-
128

greater than 12

Throttle valve mechanism sticking
Contamination in intake air ducting near throttle
valve - Check by visual inspection and repair as
necessary
greater than 12
Accelerator pedal cable adjustment
Repair Manual, Fuel Supply System, Repair
Group 20
- Adjust accelerator pedal cable
Display fields 5
+ 6
Possible malfunction cause
Corrective action
less than 118

Intake air leaks ("false air") after throttle valve- Check intake air system for leaks page 24
-
126

greater than
138
Increased engine load- Switch off electrical consumers

Throttle valve mechanism sticking
Contamination in intake air ducting near throttle
valve - Check by visual inspection and repair as
necessary
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