AUDI A8 1995 D2 / 1.G AEB Engine Throttle Valve Control Module And Checking
Manufacturer: AUDI, Model Year: 1995, Model line: A8, Model: AUDI A8 1995 D2 / 1.GPages: 38, PDF Size: 0.12 MB
Page 11 of 38
24-105
Continuation
- Switch ignition off.
- Connect VAG 1598/22 test box to ECM harness
connector Page 01
-56
.
- Connect multimeter US1119 (Fluke 83 or
similar) and check resistance between test box
sockets 67and 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
- Check wiring for short circuit between ECM/test box and 8-pin harness
connector.
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Page 12 of 38
Connector terminal 7 to ECM/test box socket 69
Specified value:
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Page 13 of 38
24-106
- Reconnect throttle valve control module harness
connector.
If wiring is OK:
- 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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Page 14 of 38
24-107
Throttle drive and angle sensor for
throttle drive, checking
Note:
Throttle drive -G186- and angle sensor -1- for
throttle drive -G187- are located in 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
Engine coolant temperature at least 80 C
(176 F)
Automatic transmission selector lever in "P"
or "N"
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Page 15 of 38
24-108
Checking
- Connect VAG 1551 or VAG 1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with engine
running at idle) Page 01
-7 .
Rapid data transfer
HELP
Select function XX
Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measurin
g Value Block
HELP
Input displa
y group number XXX
Indicated on display
- Press buttons -0-, -5- and -5- to input display group number 55, and
press -Q- button to confirm input.
Read Measuring Value Block 55 1 2 3 4
Indicated on display (1-4 = display fields)
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Page 16 of 38
24-109
- Compare display with specified values for idle
air control (display fields 1-4):
Display fields
1 2 3 4
Display group 55: Idle control
Display xxx RPM x.xx g/s x.xx g/s xxxx
Indicates Engine speed RPM
(in steps of 10 RPM) Regulating value-idle mass
air flow (idle air control) Learning value-idle
mass air flow Operating
conditions
Range 0-2550 RPM -2.80 to 4.17 g/s -1.94 to 2.22 g/s ---
Specified
value 820-900 RPM -1.11 to 1.11 g/s -1.11 to 1.11 g/s 0000
If engine speed is NOT OK
Page 24
-111
, Continuation
If display is NOT OK Page 24
-110
, Evaluating
display group 55
Explanation
Page 24
-110
If displayed values are OK:
-
Press button to advance program
sequence.
- Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
input.
- Switch ignition off.
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Page 17 of 38
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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Page 18 of 38
0 Always "0"
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Page 19 of 38
24-111
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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Page 20 of 38
Connector terminal 8 to ECM/test box socket 74
Specified value: max. 1.5
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