Checking Hall sender G163: Audi 1.8 (ARY, AUM, AUQ, BVP, …)

Checking
Hall sender
G163
The Hall sender indicates 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.
Even without a signal from the Hall sender the engine will continue to run and can also be re-started:
When a fault is detected the engine control unit produces one spark per crankshaft revolution for each cylinder.
The fact that the injection system is one revolution out of phase does not have any noticeable effect on the fuel injection. Instead of taking place when the inlet valves are open, injection is
“advanced”
(so that the fuel is injected behind the closed inlet valves). This has only a minor influence on the quality of the air/fuel mixture.
Fitting location
Chapter
“
Overview of fitting locations
”
.
Special tools and workshop equipment required
Hand-held 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
Adapter cable, 121-pin
V.A.G 1598/31
(test box)
Checking activation
If fitted, push back rubber grommet at connector for Hall sender, but leave connector plugged in.
Connect
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 should flash.
Note
Voltage testers with a low current draw do not go out completely between activation signals from engine control unit, but continue to glow slightly and become distinctly brighter on activation.
If the LED does not flash:
Check power supply, signal wire and earth wire as described in the following.
Checking voltage supply
Unplug electrical connector at Hall sender.
Connect multimeter (voltage measuring range) between contact
1
of connector and earth.
Switch on ignition.
Specification: approx. 5 V
Checking signal wire
Connect 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 connection if necessary.
If all the readings match the specifications and the LED does not flash (measured between contacts
1
and
2
with starter cranking and connector plugged in):
Renew Hall sender.
If the specifications are not obtained:
Check wiring between Hall sender and engine control unit.
Checking wiring
Connect
adapter cable, 121-pin
V.A.G 1598/31
(test box) to wiring harness for engine control unit, but do not connect the engine control unit itself
Chapter
.
Check for open circuit and short to positive or earth in the following wiring:
Connector
Contact
Adapter cable, 121-pin
V.A.G 1598/31
Socket
1
(positive)
98
2
(signal)
86
3
(earth)
108
Repair wiring connection if necessary.
If all the test results so far have been OK but a fault related to the camshaft sensor (Hall sender) is displayed again after erasing the fault memory as a test measure, the cause may be as follows:
Rotor ring on Hall sender out of position
Unbolt Hall sender, then check to ensure that the rotor ring is correctly aligned on the camshaft. If incorrectly installed, the catch will be pressed flat when the securing screw is tightened.
If the rotor ring is correctly aligned, check the position of the camshaft in relation to the crankshaft
Rep. Gr.
15
.