Checking Hall sender 2 G163: Audi 1.8 (BAM, BFV)

Checking
Hall sender 2
G163
The Hall sender supplies the ignition position for cylinder 1.
In the event of failure, the knock control is deactivated and the ignition timing retarded slightly as cylinder assignment is no longer possible. The charge pressure of the turbocharger is also reduced.
The engine continues to run without a Hall sender signal and can also be re-started:
If a fault is detected, the engine control unit triggers one ignition spark per cylinder on each crankshaft revolution.
The offset by one engine revolution has no noticeable effects on injection. Instead of taking place when the inlet valves are open, injection is
“advanced”
(to before the closed inlet valves). The quality of the mixture preparation is only slightly impaired by this.
Fitting location
Chapter
“
Exploded view of fitting locations
”
Special tools and workshop equipment required
Portable multimeter
V.A.G 1526 A
or
V.A.G 1526 B
Voltage tester
V.A.G 1527 B
Adapter set
V.A.G 1594 A
or
V.A.G 1594 C
121-pin adapter cable
V.A.G 1598/31
(test box)
Checking actuation
If fitted, push back rubber grommet at connector for Hall sender, but leave connector plugged in.
Connect up
voltage tester
V.A.G 1527 B
between contact
2
(Hall sender signal) and contact
1
(positive).
Note
The connector contacts are numbered accordingly on the back of the connector.
Operate starter for a few seconds.
The LED must flash.
Note
Voltage testers with a low current input do not go out completely between engine control unit actuation phases, they continue to glow dimly and become far brighter on actuation.
If LED does not flash:
Check power supply, signal wire and earth wire as described in the following.
Checking power supply
Unplug connector at Hall sender.
Connect up multimeter (voltage measuring range) between contact
1
of connector and earth.
Switch on ignition.
Specification: approx. 5 V
Checking signal wire
Connect up multimeter (voltage measuring range) between contact
2
of connector and earth.
Switch on ignition.
Specification: approx. battery voltage
Checking earth wire
Check for open circuit and short to positive in wiring between contact
3
of connector and earth.
Repair wiring if necessary.
If all the readings match the specifications and the light-emitting diode does not flash (measured between contacts
1
and
2
with starter operation and connector plugged in):
Replace Hall sender.
If readings do not match specifications:
Check wiring between Hall sender and engine control unit.
Checking wiring
Connect
121-pin adapter cable
V.A.G 1598/31
(test box) to wiring harness to engine control unit, but do not connect actual engine control unit
Chapter
.
Check for open circuit and short to earth or positive in the following wiring:
Connector
Contact
121-pin adapter cable
V.A.G 1598/31
Socket
1
(positive)
98
2
(signal)
86
3
(earth)
108
Repair wiring if necessary.
Possible problem if a fault relating to the camshaft sensor (Hall sender) is displayed again after erasing the fault memory on a trial basis despite all the preceding checks being successfully completed:
Hall sender rotor ring twisted
Unscrew Hall sender and check proper fitting of rotor ring at camshaft (incorrect installation results in squashing of retainer tab when tightening bolt).
If the rotor ring position is OK, check crankshaft/camshaft assignment
Rep. Gr.
15
.