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Location:
Manchester, UK
Registered:
October 2004
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Cam angle sensor 4AGZE
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Fri, 04 February 2005 13:01
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Hi everyone,
Just trying to get some info on the above as not getting a signal from the Cam angle sensor.
Ive done some searches and found that there are two types of CAS, magnetic reluctor and hall effect. How do you know which is which? I have a AE92 4AGZE with MAP sensor.
Also i think the wiring for a magnetic one is as follows:
RED: Trigger (pickup for 24 tooth wheel)
GREEN: Home pickup (TDC #1)
YELLOW: Home pickup (TDC #4)
WHITE: Common earth for pickups
As it has two pickups does this mean it calculates on half cycles or is there a wasted spark?
Any suggestions as to how to check if the unit is ok as i do know they can fail due to the air seal? going on them.
Thanks in advance
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Location:
Canberra
Registered:
May 2002
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Re: Cam angle sensor 4AGZE
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Fri, 04 February 2005 14:24
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They are magnetic reluctor.
Your wiring is correct.
They do run a wasted spark. I'm not certain what the factory computer uses the TDC #4 for, sequential injection perhaps? I thought you could still do that with only one home trigger though. 
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Registered:
July 2002
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Re: Cam angle sensor 4AGZE
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Fri, 04 February 2005 14:47
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Theres a few reasons for that. For instance, twice as many "resets" (homes) per cycle means less worst case cranking before firing. Helps to sell cars 
As 1 and 4 are fired from the same ignition channel it doesnt matter which reset it is. Naturally you could do the same with two teeth on the top wheel but by this way you have same effect wilst maintaining exact engine position (handy for when they went to sequential injection/discrete ignition later).
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Location:
Manchester, UK
Registered:
October 2004
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Re: Cam angle sensor 4AGZE
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Sat, 05 February 2005 10:58
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Thanks guys, TE72 I think it was from one of yourr posts that I got the wiring diagram.
So does anyone know how to get a signal from the sensor?
How can you check if the sensor needs replacing?
Thanks.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Cam angle sensor 4AGZE
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Sat, 05 February 2005 11:11
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One way is to hook it up to a CRO and spin it with a drill, lathe, etc. and have a look at the signal...
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Location:
Manchester, UK
Registered:
October 2004
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Re: Cam angle sensor 4AGZE
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Sat, 05 February 2005 14:39
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what do you mean by CRO ?
Thanks
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Re: Cam angle sensor 4AGZE
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Sat, 05 February 2005 14:50
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Cathode Ray Oscilliscope
screeny thing that shows waveforms
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Location:
Manchester, UK
Registered:
October 2004
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Re: Cam angle sensor 4AGZE
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Sat, 05 February 2005 16:36
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Of course not good with abbreviations!!
Thanks!
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