2000 AUDI A8 AHA Engine Motronic Ignition System Workshop Manual

28-1
Motronic ignition system Technical data, spark plugs

Engine code
AHA

Engine idle RPM

Idle RPM cannot be adjusted, is corrected by Idle Air Control (IAC) 620 - 740 RPM
(all-wheel drive)
740 - 860 RPM
(front-wheel drive)
RPM limit
Operates by shutting off fuel injectors approx. 6500 RPM
Ignition timing
Ignition timing cannot be adjusted; it is determined by the Engine Control Module (ECM)
Firing order 1-4-3-6-2-5
Spark plugs Tightening torque 30 Nm (22 ft lb)
Part No. 1) 101 000 035 HJ (NGK)
Manufacturer's code
(if applicable) BKR 6 EKUB (NGK)

Electrode gap - mm 1.6 mm

Maintenance interval Owner's Manual

Pa
ge 1 of 34 Motronic i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.1

1) Part numbers listed here are for reference only. Always check with your Parts department for the latest information.
Pa
ge 2 of 34 Motronic i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.1

28-2

Camshaft Position (CMP) sensor -G40-,
checking


Notes:

Camshaft Position (CMP) sensor -G40- is
located on the rear of the left cylinder head
(bank 2).
Checking -G163- page 28
-5

Component location page 24
-1

Required special tools and test equipment

VAG1598/22 test box
Multimeter US1119 (Fluke 83 or equivalent)
VW1594 connector test kit
Wiring diagrams
Pa
ge 3 of 34 Motronic i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.1

28-3

Checking

- Disconnect 3-pin harness connector from
Camshaft Position (CMP) sensor -G40-.

If voltage is OK: - Connect multimeter US1119 (Fluke 83 or equivalent) to measure
voltage across CMP connector terminals 1 (B+) and 3 (Ground), using
adapters from VW1594 connector test kit.
- Switch ignition on.
- Measure voltage between terminals 1 and 3.
Specified value: 9-14.5 volts
- Switch ignition off.
- Connect VAG1598/22 test box to Motronic ECM harness connector
page 01
-67
.
- Check wiring for open circuit between ECM/test box and 3-pin harness
connector, according to wiring diagram.

Connector terminal 1 to ECM/test box socket 11
Connector terminal 2 to ECM/test box socket 44
Connector terminal 3 to ECM/test box socket 14
Specified value: max. 1.5
Pa
ge 4 of 34 Motronic i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.1

28-4


If wiring is OK (and voltage across terminals 1 and 3 is OK):
If wiring is OK (but still no voltage across terminals 1 and 3): - Check wiring for short circuit between ECM/test box and 3-pin harness
connector, according to wiring diagram.

Connector terminal 3 to ECM/test box socket 44
Connector terminal 3 to ECM/test box socket 11
Connector terminal 2 to ECM/test box socket 11
Specified value:
- Replace Camshaft Position (CMP) sensor -G40-.
- Replace Motronic ECM -J220- page 01
-68
.
- 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
has been disconnected, generate new readiness code page 01
-73
.
Pa
ge 5 of 34 Motronic i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.1

28-5

Camshaft Position (CMP) sensor 2 -
G163-, checking


Notes:

Camshaft Position (CMP) sensor 2 -G163- is
located on the front of the right cylinder head
(Bank 1).
Checking -G40- page 28
-2

Component location page 24
-1

Required special tools and test equipment

VAG1598/22 test box
Multimeter US1119 (Fluke 83 or equivalent)
VW1594 connector test kit
Wiring diagrams
Pa
ge 6 of 34 Motronic i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.1

28-6

Checking

- Disconnect 3-pin harness connector from
Camshaft Position (CMP) sensor 2 -G163-.

If voltage is OK: - Connect multimeter US1119 (Fluke 83 or equivalent) to measure
voltage across CMP connector terminals 1 (B+) and 3 (Ground), using
adapters from VW1594 connector test kit.
- Switch ignition on.
- Measure voltage between terminals 1 and 3.
Specified value: 9-14.5 volts
- Switch ignition off.
- Connect VAG1598/22 test box to Motronic ECM harness connector
page 01
-67
.
- Check wiring for open circuit between ECM/test box and 3-pin harness
connector, according to wiring diagram.

Connector terminal 1 to ECM/test box socket 11
Connector terminal 2 to ECM/test box socket 76
Connector terminal 3 to ECM/test box socket 67
Specified value: max. 1.5
Pa
ge 7 of 34 Motronic i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.1

28-7


If wiring is OK (and voltage across terminals 1 and 3 is OK):
If wiring is OK (but still no voltage across terminals 1 and 3): - Check wiring for short circuit between ECM/test box and 3-pin harness
connector, according to wiring diagram.

Connector terminal 3 to ECM/test box socket 76
Connector terminal 3 to ECM/test box socket 11
Connector terminal 2 to ECM/test box socket 11
Specified value:
- Replace Camshaft Position (CMP) sensor 2 -G163-.
- Replace Motronic ECM -J220- page 01
-68
.
- 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
has been disconnected, generate new readiness code page 01
-73
.
Pa
ge 8 of 34 Motronic i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.1