Hall Sender
06-21-2001, 09:04 AM
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Hall Sender
Can anyone tell me what the hall sender does in my 87 s4? My mechanic removed my intake to fix an oil leak and when they put it back together, I found this plug disconneected. I brought the car car back and he said it was the hall sender, After they hooked it back together, the car seemed to run better. The problem is that the connecters were destroyed from heat and the wires had to rigged together. About a week has gone by and the sluggish performance is back, I checked the wire to the sensor and it seems to be okay. Is there a way to test the hall sender to see if it working?
06-22-2001, 12:12 AM
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The hall sensor adversely affects engine performance if not operating properly. I'm not certain how this wrks, I suggest you contact Wally (THE 928 God) by emailing 'tech@928gt.com'. He knows the answer - and right on the money nearly (if not every) time. 
06-22-2001, 01:59 AM
#3
In a nutshell it works like this:
The Hall(Effect) sender picks up the timing signal from the flywheel.
The signal will be at or above the max. advance required by the engine.
The computer then retard the signal to fire
the plugs for the advance setting needed at
that particular moment of engine operation.
If the sender signal is lost, you'll have a
static timing setting resulting in the poor
performance.
Jim V
The Hall(Effect) sender picks up the timing signal from the flywheel.
The signal will be at or above the max. advance required by the engine.
The computer then retard the signal to fire
the plugs for the advance setting needed at
that particular moment of engine operation.
If the sender signal is lost, you'll have a
static timing setting resulting in the poor
performance.
Jim V
06-22-2001, 06:06 PM
#4
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The Hall sensor is triggered by the left intake camshaft, and is used, in conjunction with the two flywheel sensors, to determine ignition timing.
It can be tested at the plug with an oscilloscope - you should see an almost square wave, with an amplitude of about 5 volts.
If the Hall signal is absent, the ignition timing is retarded, and performance will suffer.
Wally Plumley
928 Specialist
It can be tested at the plug with an oscilloscope - you should see an almost square wave, with an amplitude of about 5 volts.
If the Hall signal is absent, the ignition timing is retarded, and performance will suffer.
Wally Plumley
928 Specialist
06-24-2001, 11:04 PM
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A hall sensor needs a voltage supply and ground to work. The third wire is the signal wire, returning to the computer. An oscilloscope is the tester of choice for electrical circuits, but a volt meter can be used for a quick test of the basic voltage. Back probe the connector at the sensor, check all three wires with the engine running. One wire is the feed, it should read 12 volts, the other is the ground it should read no more than .010. the signal wire should vary its voltage from 0 to 5 volts, go back and check the repaired connector, make sure they are not loose, as with any automotive repair, the wires should be soldered.
Good Luck,
Steve C.
mastertech@mastertechtrans.com
Good Luck,
Steve C.
mastertech@mastertechtrans.com
