AUDI A8 1999 D2 / 1.G ATQ Engine Ignition System Checking Workshop Manual
A8 1999 D2 / 1.G
AUDI
AUDI
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AUDI A8 1999 D2 / 1.G ATQ Engine Ignition System Checking Workshop Manual
Page 19 of 65
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Display fields
1 2 3 4
Display group 004: Intake Air Temperature (IAT), engine at idle
Display xxxx/min xx.xxx volts
xxx.x C
xxx.x C
Indicated Engine speed
(RPM) Battery voltage Coolant
temperature Intake Air Temperature (IAT)
Functional
range 630 to 6800 RPM 10.000 to 15.000
V -48.0 to 143.0 C
-48.0 to 143.0 C
Specified value xxxx/min 12.000 to 15.000
V 80.0 to 110.0 C
From ambient temperature up to 120
C
1)
1) Approximate values: While driving, up to 24 C above ambient temperature. If heated while standing, up to 120 C is
possible.
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Page 26 of 65
28-23
Engine Coolant Temperature (ECT) sensor
-G62-, checking
Special Tools and Equipment
VAG1526A
VAG1594A
VAG1598/31
VAS5051 with VAG5051/1
- or
VAG1551 with VAG1551/3B
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Page 28 of 65
28-25
Display fields
1 2 3 4
Display group 004: Coolant temperature, engine at idle
Display xxxx/min xx.xxx V
xxx.x C
xxx.x C
Indicated Engine speed
(RPM) Battery voltage
Coolant temperature Intake Air Temperature (IAT)
Functional
range 630 to 6800 RPM 10.000 to
15.000 V -48.0 to 143.0 C
-48.0 to 143.0 C
Specified
value xxxx/min 12.000 to
15.000 V Temperature value must rise
evenly From ambient temperature up to
120 C
If display field 3 does not have a realistic
indication:
Note:
Intake air hose between Mass Air Flow (MAF)
sensor and intake air elbow must be removed in
order to be able to reach the coolant temperature
sensor.
- Disconnect connector at coolant temperature
sensor.
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Page 29 of 65
28-26
Coolant temperature sensor with square
connector:
Coolant temperature sensor with oval connector: - Connect multimeter between terminal 1 and 3 of connector for
resistance measurement.
- Connect multimeter between terminal 3 and 4 of connector for
resistance measurement.
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Page 30 of 65
28-27
All models
Range A shows the resistance values for the
temperature range from 0-50 C, and range B
shows the values for the temperature range from
50-100 C.
Read-out examples:
If specified value is not obtained:
If specified value is obtained:
30 C corresponds to a resistance of 1500 to 2000 80 C corresponds to a resistance of 275 to 375
- Replace coolant temperature sensor.
- Connect VAG1598/31 test box at wiring harness to ECM, do not
connect ECM Page 24
-17
.
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Page 31 of 65
28-28
Coolant temperature sensor with square
connector:
Coolant temperature sensor with oval connector: - Check the following wire connections for open circuit and short circuit
to Ground (GND) and B+: Harness connector
Terminal
VAG1598/31 test box
Socket
1 (signal) 93
3 108
- Check the following wire connections for open circuit and short circuit
to Ground (GND) and B+: Harness connector
Terminal
VAG1598/31 test box
Socket
3 108
4 (signal) 93
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