1998 AUDI A8 AEB Engine Throttle Valve Control Module And Checking

24-110
Evaluating display group 55 Display group:
55


Display fields:
2 3
Possible cause
Corrective action
above 1.11
g/s
Increased load because of
switched-on consumers
Throttle valve mechanism sticking
Air passage in area of throttle
valve contaminated - Switch off electrical consumers
- Visually check, repair if necessary
below -1.11
g/s Intake air leak (false air) behind
throttle valve
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical,
Engine Code(s): AEB, ATW, Repair Group 26
- Check intake air system for leaks (false air) Page 24
-97
- Check exhaust system:
Explanation of the 4-digit display
Explanation when display field is = 0
x
x
x
x
(Display group 55)
0 A/C compressor off (0 = A/C compressor off /1 = A/C compressor on)
0 Shift lever in P or N (0 = Shift lever in P or N/ 1 = Shift lever in 2/3/4/R/D)
0 Always "0"
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0 Always "0"
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Continuation

- Switch ignition off.

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

- Switch ignition on.

- With throttle valve in closed throttle position,
connect multimeter US 1119 (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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Connector terminal 8 to ECM/test box socket 74
Specified value: max. 1.5
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24-112

- 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:
If wiring is OK:

- Carry out adaptation of throttle valve control
module to ECM Page 24
-119
.
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- 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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24-113

Throttle Position (TP) sensor, checking


Note:
Throttle Position (TP) sensor -G69- is located
inside 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


Checking

- Connect VAG 1551 or VAG 1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with ignition
switched; engine not running) Page 01
-7 .
Rapid data transfer
HELP

Indicated on display
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Select function XX
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measuring Value Block
HELP
Input displa
y group number XXX

Indicated on display
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