wiring diagram AUDI A4 1997 B5 / 1.G AFC Engine Ignition Coil Power Output Stage Checking Workshop Manual

28-13


Ignition coil power output
stage, checking
Component locations page 28
-1 .

Fuse for ignition coils OK
Ignition coils OK; checking page 28
-16


Checking voltage supply

If the specified value is not obtained: - Disconnect 3-pin power output stage harness connector.
- Switch Fluke 83 multimeter to voltage range and connect between
Ground (GND) and terminals 1, 2 and 3 in sequence.
- Switch ignition on.
Specified value: approx. battery voltage
- Eliminate open circuit in wiring using wiring diagram.
Pa
ge 1 of 3 I
gnition coil
power out
put sta
ge, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.3

28-14

Checking Ground (GND)

- Disconnect 4-pin power output stage harness
connector.

If the specified value is not obtained:
Checking triggering - Switch Fluke 83 multimeter to voltage range, connect between
connector terminal 2 (GND) and battery positive voltage (B+).
Specified value: approx. battery voltage
- Eliminate open circuit using wiring diagram; repair as necessary.

- Disconnect 4-pin power output stage harness connector.
- Disconnect all six fuel injector harness connectors.
- Connect voltage tester between Ground (GND) and connector
terminals 1, 3 and 4 in sequence.
- Switch ignition on.
- Operate starter for several seconds.
Voltage tester must flash
Pa
ge 2 of 3 I
gnition coil
power out
put sta
ge, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.3

28-15
If voltage tester does not flash:

- Switch ignition off.

If wiring is OK:
If voltage tester flashes, wiring is OK.
If, during On Board Diagnostic, the diagnostic trouble codes
P1393/17801, P1394/17802, or P1395/17803 ("Ignition Coil Power Output
Stage 1/2/3 Electrical Malfunction") are displayed: - Switch Fluke 83 multimeter to resistance range and check wiring for
continuity between power output stage harness connector and ECM
harness connector.
- Connect VAG 1598/19 test box to ECM harness connector page 01
-
255
.
- Locate open circuit using wiring diagram; repair as necessary.
Power output stage terminal
number ECM connector B terminal
number
1 B7
3 B6
4 B5
- Replace ECM page 01
-265
.
- Replace ignition coil power output stage.
Pa
ge 3 of 3 I
gnition coil
power out
put sta
ge, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.3