1995 AUDI A8 AEB Engine Throttle Valve Control Module And Checking

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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--- --- --- If display is NOT OK Page 24
-105
, Continuation
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24-105

Continuation

- Switch ignition off.

- Connect VAG 1598/22 test box to ECM harness
connector Page 01
-56
.

- Connect multimeter US1119 (Fluke 83 or
similar) and check resistance between test box
sockets 67and 69.


Specified value: max. 5.0
-
Open throttle slowly. Specified value: If resistance is NOT OK:

- Disconnect 8-pin harness connector for throttle valve control module -
J338-.
- Check wiring for open circuit between ECM/test box and 8-pin harness
connector.

Connector terminal 3 to ECM/test box socket 69
Connector terminal 7 to ECM/test box socket 67
Specified value: max. 1.5
- Check wiring for short circuit between ECM/test box and 8-pin harness
connector.
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Connector terminal 7 to ECM/test box socket 69
Specified value:
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24-106

- Reconnect throttle valve control module harness
connector.
If wiring is OK:

- 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
.
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24-107

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
-101


Engine coolant temperature at least 80 C
(176 F)

Automatic transmission selector lever in "P"
or "N"
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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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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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