1995 AUDI A4 engine coolant

01-125

Output on GST and/or
on VAG 1551 scan tool
Possible malfunction cause

Malfunction repair
P1407 / 17815
EGR Temp.Sensor
Signal too Low Harness connector for EGR
temperature sensor -G98- loose or
corroded due to moisture in the harness
connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 24
-
1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test
drive, check DTC memory again
MIL Status:
MIL lights up
immediately Wiring connection to EGR temperature
sensor -G98- faulty or sensor -G98- faulty

- Check EGR temperature sensor -G98-
page 24
-71


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test
drive, check DTC memory again
For troubleshooting
Display group 017
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and test
drive check DTC memory
Note:
The malfunction "P1407 / 17815" is set after a cold start (coolant starting temperature less than 30 C (86 F) as soon as an
EGR temperature signal is received that lies over 200 C (392 F)
Pa
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play?action=Goto&t
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01-126

Output on GST and/or
on VAG 1551 scan tool
Possible malfunction cause

Malfunction repair
P1408 / 17816
EGR Temp.Sensor
Signal too High Harness connector for EGR
temperature sensor -G98- loose or
corroded due to moisture in the harness
connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 24
-
1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test
drive, check DTC memory again
MIL Status:
MIL lights up
immediately
Wiring connection to EGR temperature
sensor -G98- faulty or sensor -G98- faulty

- Check EGR temperature sensor -G98-
page 24
-71


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test
drive, check DTC memory again
For troubleshooting
Display group 017
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and test
drive check DTC memory
Note:
The malfunction "P1408 / 17816" is set with open idle switch, a coolant temperature greater than 72 C (162 F), a throttle
angle less than 42.5 , a vehicle speed between 70 km/h and 105 km/h (44 and 66 mph), an EGR valve duty cycle greater
Pa
ge 169 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-151

Note:
After function 04 is called up, the Engine Control
Module (ECM) carries out the following
operations:

Constant ignition timing point of 12 BTDC is
output in idle.

Digital idle speed control is blocked.
Evaporative emissions canister purge regulator
valve is closed.
A/C compressor is switched off.
EGR vacuum regulator solenoid valve is
closed
No coolant temperature correction-fixed value
of 80 C (176 F)

Learning values are relearned (idle and CO
content are adjusted automatically)
Pa
ge 207 of 366 On Board Dia
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yp
e=re
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01-156
Display group overview with test table

Note:
Display groups 000 to 010 are used for general troubleshooting.
Display group
Display shows
Designation
000 Basic setting 0
1 2 3 4 5 6 7 8 9 10 Key to displays page 01
-163

001 Basic setting 1
1 2 3 4 1 = Engine coolant temperature
2 = Mass Air Flow (MAF) sensor output voltage
3 = Altitude display (only on vehicles with secondary air system )
4 = Engine Control Module (ECM) voltage supply
002 Basic setting 2
1 2 3 4 1 = Throttle Position (TP) sensor voltage (coarse)
2 = Throttle Position (TP) sensor voltage (fine)
3 = Throttle Position (TP) sensor learning value
4 = Closed Throttle Position (CTP) switch
003 Basic setting 3
1 2 3 4 1 = Engine speed (RPM)
2 = Engine load
3 = Throttle angle
Pa
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01-162

099 Basic setting 99
1 2 3 4 1 = Momentary engine speed
2 = Momentary engine load
3 = Coolant temperature
4 = Oxygen sensor control OFF/ON Note:
Display group 99 can switch the oxygen sensor control on or off.
Pa
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01-163
Display group 000
Note:
If the values displayed do not correspond to the specified values, the following display groups 001 to 010 can be used to
repair malfunctions. Display
field Specified
display value Corresponds to
physical values Designation and conversion to physical values
1 135 - 160
85 - 110 C
Momentary coolant temperature, display -50 = ___ C
2 145 - 158 1.45 - 1.58 V Mass Air Flow (MAF) sensor output voltage, display: 100 = 1 V
3 26-30 650-750 RPM Momentary engine speed, display X 25 = ____RPM
4 0 - 14
or
255 - 240 Idle speed control learning value, with manual transmission in idle
position and/or with automatic transmission with selector lever setting
P or N (average = 0)
5 0 -10
or
255 - 236 Idle speed control learning value, with automatic transmission in
selector lever setting D 1, 2, 3 or R (average = 0)
(On manual transmission vehicles, 0 is always displayed.)
6 126 - 130 Idle speed control feedback (average 128)
7 20 Shift inputs
8 120-136 Oxygen sensor control (average 128/cylinders 1 to 3) "0" is always
displayed on engines without oxygen sensor probe.
Pa
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01-165
Display group 001 Display shows
Display/specified value
Designation
Basic setting 1
1 2 3 4 85-110 C
1 = Coolant temperature
1.450-1.580 V2) 2 = Mass Air Flow (MAF) sensor1) output voltage
0 - 255 3 = Altitude display
12.000 - 14.000 V 4 = Engine Control Module (ECM) voltage supply battery voltage
1) specified value minus 0.01 V per 500 m above sea level. 2) Mass Air Flow (MAF) sensor output voltage tolerance range can only be evaluated during basic setting at idle.
Note on display field 3:
The altitude display is a calculated value inside the engine control module that is calculated by a comparison of the intake air
mass and the throttle angle.
Pa
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(OBD
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01-166
Test table display group 001 Display
field Display on
VAG 1551 scan
tool Malfunction cause
Malfunction repair
1 Greater than
110
or
Less than 85
Engine Coolant Temperature (ECT)
sensor -G62-
Wiring connection to Engine Control
Module (ECM) -J192-
Coolant thermostat faulty
Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 19
- Check DTC memory page 01
-13
- Check -G62- page 28
-25
- Check engine coolant thermostat
2 Less than 1.450
V
Large intake air leak between intake
manifold and Mass Air Flow (MAF)
sensor Repair cause
Greater than
1.580 V Electrical consumers on, steering wheel
at end stop, driving mode selected
(automatic transmission)
Tolerance for new engines: - Switch consumers off
- Center steering wheel
- Put selector lever in P or N position
display group 004, display field 4
Max. 1.660 V
When engine speed increases, the display
value increases to 2.500 V, falls to 0.000 V
Pa
ge 231 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1