AUDI A8 1995 D2 / 1.G AEB Engine Throttle Valve Control Module And Checking

24-117

Continuation (with measured voltage)

If measured voltage was approx. 5 volts:
If measured voltage was approx. battery positive voltage (B+): - Disconnect 8-pin harness connector from throttle valve control module
-J338-.
- Connect multimeter US 1119 (Fluke 83 or equivalent), using adapter
cables from VW 1594 connector test kit.
- Measure resistance to check for short circuit between test box sockets
62 (power supply) and 75 (signal wire).

Test box sockets 62 and 75
Specified value:
- Check wiring at 8-pin connector, terminal 5 for short circuit to battery
B+.
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Continuation (with no measured voltage)

- Disconnect 8-pin harness connector from throttle
valve control module -J338-.

If wiring is OK: - Check wiring for open circuit between ECM/test box and 8-pin harness
connector.

Connector terminal 5 to ECM/test box socket 75
Specified value: max. 1.5
- 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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24-119

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 Page 24
-119
.
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

VAG 1551 or VAG 1552 Scan Tool (ST) with
VAG 1551/3 adapter cable

Test conditions
No malfunctions stored in DTC memory
Page 01
-15


Throttle valve in closed throttle position; if
necessary adjust accelerator pedal cable
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Repair Manual, Fuel Supply System, Repair
Group 20


Cruise control adjustment OK
Power supply for throttle valve control
module OK; checking Page 24
-101

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Test procedure

- Connect VAG 1551 or VAG 1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with ignition
switched on; engine not running) Page 01
-7 .
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, and
press -Q- button to confirm input.
System in Basic Setting 60 1 2 3 4

Indicated on display (1-4 display fields)
Note:
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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- 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 0-5 Idle ADP. runs

ADP. OK

(ADP. ERROR indicates unsuccessful
adaptation)

If displayed values are NOT OK:
- Check DTC memory ( Page 01
-15
)
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- Check throttle valve control module ( Page 24
-99
)
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If displayed values are OK:

- Allow at least 30 seconds.

- End adaptation as soon as possible after 30
seconds by pressing button.
- Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
input.
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