buttons 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 7 of 36
Rapid data transfer
HELP
Select function XX
Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measurin
g Value Block
HELP
Input display group number XXX
Indicated on display
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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 13 of 36
24-137
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 .
Rapid data transfer
HELP
Select function XX
Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measurin
g Value Block
HELP
Input displa
y group number XXX
Indicated on display
- Press buttons -0-, -5- and -5- to input display group number 55 (055),
and press -Q- button to confirm input.
Read Measuring Value Block 55 1 2 3 4
Indicated on display (1-4 = display fields)
- Compare display with specified values for idle air control (display fields
1-4):
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Page 15 of 36
- Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
input.
- Switch ignition off.
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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 22 of 36
Rapid data transfer
HELP
Select function XX
Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measurin
g Value Block
HELP
Input display group number XXX
Indicated on display
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Page 23 of 36
24-144
- Press buttons -0-, -0- and -3- to input display
group number 3 (003), and press -Q- button to
confirm input. Read Measuring Value Block 3 1 2 3 4
Indicated on display (1-4 = display fields)
- Compare display with specified values for throttle angle, (display field
3):
Display fields
1 2 3 4
Display group 3: Load measurement
Display xxx RPM xx.x g/s
xxx
xx.x BTDC
Indicates Engine speed
(in 40 RPM
steps) Mass air
flow Throttle angle Ignition timing
Range 0 - 6800 RPM ---
0 - 90
0.0 - 50.0
BTDC
Specified
value 0 RPM ---
0 - 5
0.0
--- --- If not as specified page 24
-146
, Evaluation of
display group 3
---
-
Open throttle valve slowly while monitoring degree ( ) value in display field 3. Value must increase uniformly over the entire range.
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Page 25 of 36
24-145
- Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
input.
- Switch ignition off.
Note:
The values displayed in display field 3 depend on
the calibration of the Throttle Position (TP)
sensor and do not correspond with the actual
throttle valve opening in degrees. The maximum
displayed value is 90.0 . If the throttle angle value does not increase
uniformly:
- Replace throttle valve control module -J338-.
- Carry out adaptation of throttle valve control
module to ECM page 24
-150
.
- Check readiness code page 01
-70
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
generate new readiness code page 01
-73
.
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Page 33 of 36
24-151
Test procedure
- Connect VAG1551 or VAG1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with ignition
switched on; engine not running) page 01
-8 .
Rapid data transfer
HELP
Select function XX
Indicated on display
- Press buttons -0- and -4- to select "Basic Setting" function 04, and
press -Q- button to confirm input.
System in Basic Settin
g
HELP
Input displa
y group number XXX
Indicated on display
- Press buttons -0-, -6- and -0- to input display group number 60 (060),
and press -Q- button to confirm input.
System in Basic Setting 60 1 2 3 4
Indicated on display (1-4 display fields)
Notes:
After confirming input of display group 60, adaptation is started. The
Throttle Position (TP)sensor is positioned in the closed throttle, wide
open throttle and limp-home positions. Following this procedure, other
intermediate steps will create a characteristic curve of the relationship
between Throttle Position (TP) sensor -G69- and angle sensor for
throttle drive -G187-. The Motronic ECM stores these values in permanent memory.
Afterward, the throttle valve assumes the starting position.
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