AUDI A4 1999 B5 / 1.G AHA Engine Throttle Valve Control Module Checking User Guide

24-135


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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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
-130


Engine coolant temperature at least 80 C
(176 F)

Automatic transmission selector lever in "P"
or "N"
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Checking

- Connect VAG1551 or VAG1552 scan tool and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with engine
running at idle) page 01
-8 .
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 (055),
and press -Q- button to confirm input.
Read Measuring Value Block 55 1 2 3 4

Indicated on display (1-4 = display fields)
- Compare display with specified values for idle air control (display fields
1-4):
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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 -2.78 to +2.85 g/s -1.67 to +3.34 g/s ---
Specified
value 620 - 740 RPM
(all-wheel drive)
or
740 - 860 RPM
(front-wheel drive) -1.39 to +1.39 g/s -1.39 to +1.39 g/s 0000
(all-wheel drive)
and/or
0100
(front-wheel
drive)

If engine speed is NOT OK page
24
-141
, Continuation
If display is NOT OK page 24
-139
, Evaluation of
display group 55
Explanation
page 24
-140


If displayed values are OK:

-
Press button.
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- 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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24-139
Evaluation of display group 55 Display group:
55


Display fields:
2 3
Possible malfunction cause
Corrective action
above 1.39 g/s

Increased load because of switched-
on consumers - Switch off electrical consumers

Throttle valve mechanism sticking
Air passage in area of throttle valve
contaminated - Visually check, repair if necessary
below -1.39 g/s
Intake air leak (false air) behind
throttle valve - Check intake air system for leaks (false air) page 24
-126
- Check exhaust system Repair Manual, 2.8 Liter V6 5V
General, Engine, Repair Group 26
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Explanation of 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 Idle air control boost (0 = no idle air control boost, for all-wheel drive vehicles; 1 = idle air control boost, for
front-wheel drive vehicles)
0 always "0"
Note:
The increased idle speed (raised rpm) on vehicles with front-wheel drive is attained if there is power supplied (B+, 15er) to
terminal 10 of the engine control module.
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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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Connector terminal 8 to ECM/test box socket 74
Specified value: max. 1.5
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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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