display AUDI A8 1995 D2 / 1.G AEB Engine Throttle Valve Control Module And Checking
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Page 8 of 38
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 9 of 38
24-104
- Press buttons -0-, -0- and -5- to input display
group number 5, 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 0.00-8.50 ms --- ---
Specified value 760-960 RPM 0.50-1.50 ms 0 km/h Throttle closed: "Idle"
Throttle slightly open: "Part throt"
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Page 10 of 38
--- --- --- If display is NOT OK Page 24
-105
, Continuation
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Page 15 of 38
24-108
Checking
- Connect VAG 1551 or VAG 1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with engine
running at idle) Page 01
-7 .
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, and
press -Q- button to confirm input.
Read Measuring Value Block 55 1 2 3 4
Indicated on display (1-4 = display fields)
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Page 16 of 38
24-109
- Compare display with specified values for idle
air control (display fields 1-4):
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 -2.80 to 4.17 g/s -1.94 to 2.22 g/s ---
Specified
value 820-900 RPM -1.11 to 1.11 g/s -1.11 to 1.11 g/s 0000
If engine speed is NOT OK
Page 24
-111
, Continuation
If display is NOT OK Page 24
-110
, Evaluating
display group 55
Explanation
Page 24
-110
If displayed values are OK:
-
Press button to advance program
sequence.
- 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 17 of 38
24-110
Evaluating display group 55 Display group:
55
Display fields:
2 3
Possible cause
Corrective action
above 1.11
g/s
Increased load because of
switched-on consumers
Throttle valve mechanism sticking
Air passage in area of throttle
valve contaminated - Switch off electrical consumers
- Visually check, repair if necessary
below -1.11
g/s Intake air leak (false air) behind
throttle valve
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical,
Engine Code(s): AEB, ATW, Repair Group 26
- Check intake air system for leaks (false air) Page 24
-97
- Check exhaust system:
Explanation of the 4-digit display
Explanation when display field is = 0
x
x
x
x
(Display group 55)
0 A/C compressor off (0 = A/C compressor off /1 = A/C compressor on)
0 Shift lever in P or N (0 = Shift lever in P or N/ 1 = Shift lever in 2/3/4/R/D)
0 Always "0"
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Page 23 of 38
24-113
Throttle Position (TP) sensor, checking
Note:
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
-101
Checking
- Connect VAG 1551 or VAG 1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with ignition
switched; engine not running) Page 01
-7 .
Rapid data transfer
HELP
Indicated on display
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Page 24 of 38
Select function XX
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measuring Value Block
HELP
Input displa
y group number XXX
Indicated on display
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Page 25 of 38
24-114
- Press buttons -0-, -0- and -3- to input display
group number 3, 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
-115
, Evaluating 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 27 of 38
24-115
- 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
-119
.
- Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
generate new readiness code Page 01
-62
.
Evaluating display group 3
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