wiring AUDI A8 1998 D2 / 1.G AHA Engine Throttle Valve Control Module Checking Workshop Manual

24-128


Throttle valve control module,
checking

Notes:

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
-150
.

Component locations page 24
-1

Required special tools and test equipment

VAG1551 or VAG1552 Scan Tool (ST) with
VAG1551/3 adapter cable
VAG1598/22 test box
Multimeter US1119 (Fluke 83 or equivalent)
VW1594 connector test kit
Wiring diagrams
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Throttle valve control module power
supply, checking


If voltage is NOT OK: - Disconnect 8-pin harness connector from throttle valve control module
-J338-.
- Connect multimeter US1119 (Fluke 83 or equivalent) between harness
connector terminals using adapter cables from VW1594 connector test
kit.
- Switch ignition on, and check voltage. Specified values:

Connector terminals 3 and 7 (Ground): 9.0-14.5 volts
Connector terminals 4 and 7 (Ground): 4.0-6.0 volts
- Switch ignition off.
- Connect VAG1598/22 test box page 01
-67
.
- 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 4 to ECM/test box socket 62
Connector terminal 7 to ECM/test box socket 67
Specified value: max. 1.5
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If wiring is OK: - Check wiring for short circuit between ECM/test box and 8-pin harness
connector.

Connector terminal 7 to ECM/test box socket 69
Connector terminal 7 to ECM/test box socket 62
Connector terminal 4 to ECM/test box socket 67
Specified value:
- Reconnect throttle valve control module harness connector.
- Replace Motronic Engine Control Module (ECM) -J220- page 01
-
68
.
- 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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Continuation

- Switch ignition off.

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

- Connect multimeter US1119 (Fluke 83 or
similar) and check resistance between test box
sockets 67 and 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
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If wiring is OK: - Check wiring for short circuit between ECM/test box and 8-pin harness
connector.

Connector terminal 7 to ECM/test box socket 69
Specified value:
- Reconnect throttle valve control module harness connector.
- 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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Continuation

- Switch ignition off.

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

- Switch ignition on.

- With throttle valve in closed throttle position,
connect multimeter US1119 (Fluke 83 or
equivalent), and check resistance between
ECM/test box sockets 59 and 66.


Specified value: 3-200 If resistance is NOT OK:

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

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

Connector terminal 1 to ECM/test box socket 66
Connector terminal 2 to ECM/test box socket 59
Connector terminal 7 to ECM/test box socket 67
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If wiring is OK: - Check wiring of 8-pin connector for short circuit between wires,
according to wiring diagram.

Connector terminal 1 to ECM/test box socket 59
Connector terminal 1 to ECM/test box socket 74
Connector terminal 1 to ECM/test box socket 67
Connector terminal 2 to ECM/test box socket 67
Connector terminal 2 to ECM/test box socket 74
Connector terminal 7 to ECM/test box socket 74
Specified value:
- 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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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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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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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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