air condition AUDI A8 1998 D2 / 1.G AHA Engine Throttle Valve Control Module Checking Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1998, Model line: A8, Model: AUDI A8 1998 D2 / 1.GPages: 36, PDF Size: 0.12 MB
Page 6 of 36

24-132
Closed Throttle Position (CTP) switch,
checking
Note:
The Closed Throttle Position (CTP) switch -F60-
is inside the throttle valve control module -J338-.
Test conditions
Throttle valve in closed throttle position; if
necessary adjust accelerator pedal cable
Repair Manual, Fuel Supply System, Repair
Group 20
Cruise control adjustment OK
Power supply for throttle valve control
module OK; checking page 24
-130
Checking
- Connect VAG1551 or VAG1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with engine
running at idle) page 01
-8 .
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Page 8 of 36

24-133
- Press buttons -0-, -0- and -5- to input display
group number 5 (005), and press -Q- button to
confirm input. Read Measuring Value Block 5 1 2 3 4
Indicated on display (1-4 = display fields)
- Check Closed Throttle Position (CTP) switch (display field 4):
Display fields
1 2 3 4
Display group 5: Engine electronics
Display xxx RPM xx.xx ms xxx km/h Idle
Part throt
Full throt
Decel
Enrich
Indicates Engine speed
(in 40 RPM steps) Engine load Vehicle speed Operational condition
Range 0 - 6800 RPM 0.00 - 12.75 ms --- ---
Specified value 620 - 740 RPM
(all-wheel drive) 1.00 - 2.50 ms 0 km/h Throttle closed: "Idle"
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Page 12 of 36

24-136
Throttle drive and angle sensor for
throttle drive, checking
Note:
Throttle drive -G186- and angle sensor -1- for
throttle drive -G187- are located in the throttle
valve control module -J338-.
Test conditions
Throttle valve in closed throttle position; if
necessary adjust accelerator pedal cable
Repair Manual, Fuel Supply System, Repair
Group 20
Cruise control adjustment OK
Power supply for throttle valve control
module OK; checking page 24
-130
Engine coolant temperature at least 80 C
(176 F)
Automatic transmission selector lever in "P"
or "N"
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Page 14 of 36

24-138
Display fields
1 2 3 4
Display group 55: Idle control
Display xxx RPM x.xx g/s x.xx g/s xxxx
Indicates Engine speed RPM
(in steps of 10 RPM) Regulating value-idle mass air
flow (idle air control) Learning value-idle
mass air flow Operating
conditions
Range 0 - 2550 RPM -2.78 to +2.85 g/s -1.67 to +3.34 g/s ---
Specified
value 620 - 740 RPM
(all-wheel drive)
or
740 - 860 RPM
(front-wheel drive) -1.39 to +1.39 g/s -1.39 to +1.39 g/s 0000
(all-wheel drive)
and/or
0100
(front-wheel
drive)
If engine speed is NOT OK page
24
-141
, Continuation
If display is NOT OK page 24
-139
, Evaluation of
display group 55
Explanation
page 24
-140
If displayed values are OK:
-
Press button.
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Page 21 of 36

24-143
Throttle Position (TP) sensor, checking
Note:
The Throttle Position (TP) sensor -G69- is
located inside the throttle valve control module -
J338-.
Test conditions
Throttle valve in closed throttle position; if
necessary adjust accelerator pedal cable
Repair Manual, Fuel Supply System, Repair
Group 20
Cruise control adjustment OK
Power supply for throttle valve control
module OK; checking page 24
-130
Checking
- Connect VAG1551 or VAG1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with ignition
switched; engine not running) page 01
-8 .
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Page 31 of 36

24-150
Throttle valve control module,
adaptation to Engine Control Module
(ECM)
If the throttle valve control module -J338- is
removed and installed, or replaced, adaptation of
the throttle valve control module to the Motronic
ECM is required.
During "adaptation" with ignition switched on and
the engine not running, the Motronic ECM
"learns" the closed throttle position (CTP), wide
open throttle (WOT) and other positions of the
throttle valve control module, and a characteristic
curve of the relationship between Throttle
Position (TP) sensor -G69- and angle sensor for
throttle drive -G187-.
Required special tools and test equipment
VAG1551 or VAG1552 Scan Tool (ST) with
VAG1551/3 adapter cable
Test conditions
No malfunctions stored in DTC memory
page 01
-16
Throttle valve in closed throttle position; if
necessary adjust accelerator pedal cable
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Page 34 of 36

24-152
- Compare display with specified values (display
fields 1-4):
Display fields
1 2 3 4
Display group 60: Basic setting-throttle valve control module
Display
xxx
xxx
Idle
Part throt
Full throt
Decel
Enrich ADP runs
ADP. OK
ADP. ERROR
Indicates Throttle valve
angle Throttle drive
angle Operating
condition Adaptation condition
Range
0 - 90
--- --- ---
Specified
value 1 - 10
(automatic trans.)
1 - 20
(manual trans.) --- Idle ADP. runs
0 - 5
0 - 5
Idle ADP. OK
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