manual transmission AUDI A4 1997 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-1
On Board Diagnostic (OBD) - Multiport Fuel Injection (MFI) Engine Control Module (ECM) versions - overview

Engine control modules: 4A0 906 266 A
4A0 906 266 AA
4A0 906 266 AB
These are the introductory version and successor versions for the USA Audi 100 with On Board Diagnostic (OBD I). The
engine control modules are downwardly compatible. The function and structure of the system are described in Self-study
Program No. 130.
Engine control module: 8A0 906 266 B
With this version, the MFI ECM was completely modified. Important new features are:
- Oxygen sensor control with learning function; CO adjustment on Mass Air Flow (MAF) sensor eliminated.
- Coding of MFI ECM using VAG 1551 scan tool and "Code Control Module" function 07.
Engine control modules: 8A0 906 266 E
8A0 906 266 H
8A0 906 266 J
These are the successor versions of the 8A0 906 266 B control module.
Engine control module: 8A0 906 266 D
With this version, the On Board Diagnostic II (OBD II) was used in the Audi A6 with 2.8 liter V6, manual transmission and
front wheel drive. Important new features on vehicles with OBD II are:
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01-25

Diagnostic Trouble Code
(DTC) Malfunction text
MIL switching
condition
SAE
VAG
P1600 18008 Power Supply (B+) Terminal 15 Low Voltage off
P1602 18010 Power Supply (B+) Terminal 30 Low Voltage immediately
P1606 18014 Rough Road Spec Engine Torque ABS-SG Electrical
Malfunction off
P1611 18019 MIL Call-up Circ./Transm. Control Module Short to Ground immediately
P1612 18020 ECM Incorrectly Coded immediately
P1613 18021 MIL Call-up Circ.Open Short to B+ immediately
P1746 00532 Repair Manual, 5 Spd. Automatic Transmission 01V

P1748 65535 Repair Manual, 5 Spd. Automatic Transmission 01V
P1813 00264 Repair Manual, 5 Spd. Automatic Transmission 01V
P1818 00266 Repair Manual, 5 Spd. Automatic Transmission 01V
P1823 00268 Repair Manual, 5 Spd. Automatic Transmission 01V
P1828 00270 Repair Manual, 5 Spd. Automatic Transmission 01V Pa
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01-88

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

Malfunction repair
P0706 / 17090
Transmission Range Sensor
Circuit Range/Performance Engine control module incorrectly coded

- Cause: the vehicle is equipped with
manual transmission, but was coded
for vehicle with automatic
transmission.
- Remedy: code vehicle correctly
according to Coding Table

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
MIL Status:
Malfunction not displayed by
MIL Automatic transmission: faulty wiring
connection between Engine Control Module
(ECM) -J192- and multi-function Transmission
Range (TR) switch -F125-

- Check gear recognition signal
page 24
-99

For troubleshooting
Display group 004
Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again

Automatic transmission: malfunction of
multi-function Transmission Range (TR) switch
-F125-

Repair Manual, 5 Spd. Automatic
Transmission 01V On Board Diagnostic (OBD), Repair Group 01
- Check multi-function Transmission
Range (TR) switch -F125-

Malfunction cause found: Yes

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01-89

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

Malfunction repair
P0707 / 17091
Transmission Range
Sensor Circuit Low
Input Wiring connection between Engine Control
Module (ECM) -J192- and multi-function
Transmission Range (TR) switch -F125- on
automatic transmission faulty

- Check gear recognition signal page 24
-99


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
MIL Status:
Malfunction not
displayed by MIL Malfunction on multi-function Transmission
Range (TR) switch -F125- of automatic
transmission

Repair Manual, 5 Spd. Automatic
Transmission 01V On Board Diagnostic (OBD), Repair Group 01, Electrical testing

- Check multi-function Transmission
Range (TR) switch -F125-
For troubleshooting
Display group 004
Malfunction cause found: Yes


- Erase DTC memory, test drive and
after test drive, check DTC memory
again
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01-142

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

Malfunction repair
P1611 / 18019
MIL Call-up Circ./
Transm.Control Module
Short to Ground Wiring connection between Engine
Control Module (ECM) -J192- and
Transmission Control Module (TCM) -J217-
faulty

- Check MIL wiring from Transmission
Control Module (TCM) -J217- page 24
-
105


Malfunction cause found: Yes
No

- Erase DTC memory, test drive, after test
drive check DTC memory again
MIL Status:
MIL lights up
immediately Transmission Control Module (TCM) -
J217- faulty

Repair Manual, 5 Spd. Automatic
Transmission 01V On Board Diagnostic (OBD), Repair Group 01
- Replace Transmission Control Module
(TCM) -J217-

Malfunction cause found: Yes
No

- Erase DTC memory, test drive, after test
drive check DTC memory again
For troubleshooting
Display group 027
Engine Control Module (ECM) -J192-
faulty

- Replace and code ECM -J192- page 01
-265
erase DTC memory and take
test drive check DTC memory
Notes:
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01-143

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

Malfunction repair
P1612 / 18020
ECM Incorrectly
Coded Malfunction P1606 / 18014 "Rough
Road Spec Engine Torque ABS-SG
Electrical Malfunction" also stored in DTC
memory
No
Yes

- Engine control module incorrectly coded

Cause: The vehicle is equipped with traction
control, but coding was done for vehicle
without traction control.
Remedy: code vehicle correctly according to
coding table.

Malfunction cause found: Yes
No

- Erase DTC memory, take test drive, after test
drive check DTC memory again
MIL Status:
Malfunction not
displayed by MIL Engine control module incorrectly coded


Cause: Vehicle is equipped with automatic
transmission, but was coded for manual
transmission or otherwise incorrectly coded
Remedy: code vehicle correctly according to
coding table.

Malfunction cause found: Yes


- Erase DTC memory, test drive, after test drive
check DTC memory again
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01-144

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

Malfunction repair
P1613 / 18021
MIL Call-up Circ.Open
Short to B+ Wiring connection between Engine
Control Module (ECM) -J192- and
Transmission Control Module (TCM) -J217-
faulty

- Check MIL wiring from Transmission
Control Module (TCM) -J217- page 24
-
105


Malfunction cause found: Yes
No

- Erase DTC memory, test drive, after test
drive check DTC memory again
MIL Status:
MIL lights up
immediately
Transmission Control Module (TCM) -
J217- faulty

Repair Manual, 5 Spd.
Automatic
Transmission 01V On Board Diagnostic (OBD), Repair Group 01
- Replace ABS control module -J104-

Malfunction cause found: Yes
No

- Erase DTC memory, take test drive, after
test drive check DTC memory again
For troubleshooting
Display group 027
Engine Control Module (ECM) -J192-
faulty

- Replace and code ECM -J192- page 01
-265
erase DTC memory and take
test drive check DTC memory
Notes:

This malfunction can only occur in connection with an automatic transmission.
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01-150

Basic Setting (scan tool function 04)


Notes:

Basic setting is carried out with engine
running.
The OBD II engine control module shows the
"Readiness Code" in display group 29. The
readiness code is reset when the engine control
module power is off and each time the DTC
memory is erased. In order to regenerate the
readiness code it is necessary to take a trip in
"mixed city and highway" driving-approx. 1-1/2
to 5 minute drive at 80-100 km/h (50-63 mph)
with manual transmission in 4th or 5th gear,
preferably 4th gear, or automatic transmission
selector lever in "D" position.
When the "Basic Setting" function 04 is initiated
with the VAG 1551 scan tool, the learning
values are relearned in systems capable of
learning. Learning is prohibited, as soon as a
malfunction is stored in the DTC memory that
relates to a system capable of learning (not with
sporadic malfunctions).
All learning values are erased by disconnecting
the connector from the Engine Control Module
(ECM). After that, uneven idle can occur briefly.
In this case, let engine run in idle for a few
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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.
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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
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