1995 AUDI A8 AEB Engine Throttle Valve Control Module And Checking

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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-
Press button to advance program sequence.
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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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Display group: 3


Display field: 3
Possible cause
Corrective action
0.0
Open circuit in wiring- Check wiring Page 24
-116
99.0
Short circuit to ground (GND)
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Checking wiring

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

- 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 2 (Ground) and 75
(signal wire).


Test box sockets 2 and 75

Specified value:

- Switch multimeter to voltage (20 VDC)
measuring range.

- Switch ignition on.

- Check wiring for short circuit to B+.

Note voltage reading if applicable (if not 0
volts).
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- Switch ignition off.

- Continue test, depending on whether or not
voltage was measured Page 24
-117
or page
Page 24
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.
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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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g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.2