1997 AUDI A4 AHA Engine Throttle Valve Control Module Checking Workshop Manual

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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24-146
Evaluation of display group 3 Display
group: 3


Display field:
3
Possible malfunction cause
Corrective action
0.0
Open circuit or short circuit to B+ in signal wire between throttle position
sensor -G69- and engine control module
Malfunction in Ground for -G69-- Check wiring page
24
-147

99.0
Short circuit to Ground in signal wire between throttle position sensor -G69-
and engine control module
Malfunction in voltage supply for -G69-
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24-147

Checking wiring

- Connect VAG1598/22 test box to ECM harness
connector page 01
-67
.

- Connect multimeter US1119 (Fluke 83 or
equivalent), using adapter cables from VW1594
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
-148
or page
Page 24
-149
.
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24-148

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 US1119 (Fluke 83 or equivalent), using adapter
cables from VW1594 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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24-149

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
-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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24-150

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.
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

VAG1551 or VAG1552 Scan Tool (ST) with
VAG1551/3 adapter cable

Test conditions
No malfunctions stored in DTC memory
page 01
-16


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
-130

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