Q451990
Old School Q Guru
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6935 posts
1990 Q45 - 96K, 2005 G35 Sedan - 51K, 2004 Frontier M/T - 57K
Columbia, SC
7-23-2002
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Welcome to NICO!The "crankshaft position sensor" is typically abbreviated CAS (for crank angle sensor) If you don't have a copy of the factory service manual, you can download one in our library here. I believe you just unbolt the old one and insert the new one. Then you have to reset the base timing - which requires a timing light. Or you can very accurately measure the position of the old one and install the new one in exactly the same position and you'll probably be fine. Good luck! Heath
1990 Infiniti Q45 **** AKA "Q2"
2005 Infiniti G35 **** Sedan A/T
2004 Nissan Frontier.. King Cab M/T
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bdl
Offline
7 posts
Q45
highland village tx
10-20-2009
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| « Re: (Q451990) | 12:20 PM 10/21/2009 |
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Thanks for your help
Do you have a link to infiniti parts catalog link?
when I try and find a crankshaft position sensor
all these part houses take me to a camshaft position sensor or crank angle sensor
which is not the right part.I called a Infiniti dealer he went to the shop repair manual and can see the part I need but has no part# listed for a 1996 in his computer.He is still looking into it for me.Thanks bdl
Modified by bdl at 12:28 PM 10/21/2009
Modified by bdl at 3:03 PM 10/21/2009
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Q45tech
Q45 Guru
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13723 posts
1990 Q45 323,000 miles 19.5 years ownership
Marietta , Georgia
4-30-2002
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| « Re: (bdl) | 8:49 PM 10/21/2009 |
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Replace BOTH KS and harness.
CAS code is usually dirty corroded plug or socket unless you have over 250,000 miles then they wear out.
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jellis1969
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1 posts
1994 Q45 a
Martins Ferry Ohio
10-31-2009
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have 94 q45q: Had motor replaced. Was ruuning really good. Engine started bucking at 2000 rpms. Somedays will run perfect. Somedays will not start, engine light will be on. If you let car sit for 20 minutes or more will start. Never no when it will occur again. Engine has less than 40,000 miles on it. Very powerful motor.
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silkysmoothyjud
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325 posts
1994 Q45
Wentzville MO
11-21-2006
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| « Re: (jellis1969) | 6:03 PM 10/31/2009 |
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Bucking is MAF connector, KS will cause all kinds of crazy codes. When my KS failed, it threw KS, O2 sensor and leaking injector codes on mine. Fixed KS and harness as per Q45 tech and it all went away and has not been back since....
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Q45tech
Q45 Guru
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13723 posts
1990 Q45 323,000 miles 19.5 years ownership
Marietta , Georgia
4-30-2002
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| « Re: (silkysmoothyjud) | 1:47 PM 11/1/2009 |
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Remember 1996 Q45 is very very very different [acting/coding]from 1995 or earlier. The OBDII ECU.............besides the milder cams and lack of VVT period.
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bdl
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7 posts
Q45
highland village tx
10-20-2009
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| « Re: (Q45tech) | 4:51 PM 11/1/2009 |
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You are right the local Infiniti dealer did not have a part # for the Crankshaft position sensor in his catalog but he was able to get the # from the manufacture
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Paul Wall
Q45 Enthusiast
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4224 posts
1993 Infiniti Q45 133,000 Miles
Ipswich MA
12-22-2007
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| « Re: (bdl) | 5:51 PM 11/1/2009 |
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How long has that failure for a parts guy worked at the dealership?There are three part numbers for the Distributor (As its called in Nissan FAST (Dealer parts lookup program))/Crankshaft Postion Sensor. But the one for your year Q45 is: 23731-67U01-
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bdl
Offline
7 posts
Q45
highland village tx
10-20-2009
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| « Re: (Paul Wall) | 6:36 PM 11/1/2009 |
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That seems tobe the problem everybody seems to think that the crankshaft postion sensor and the crank angle sensor are the same thing
but they are not on a 96 Q45.The crankshaft postion sensor on a 96 Q45 is located on the bell housing of the transmission part #237310J200
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silkysmoothyjud
Offline
325 posts
1994 Q45
Wentzville MO
11-21-2006
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| « Re: (bdl) | 4:18 PM 11/6/2009 |
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Just replaced one on a Catera, it makes sense now, I thought he was talking about the CAS on the 94... 
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bdl
Offline
7 posts
Q45
highland village tx
10-20-2009
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| « Re: (Paul Wall) | 4:31 AM 11/7/2009 |
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If you go to the service manual for a 1996 Q45
It shows the crankshaft postion sensor on the bell housing
of the transmission.1996 Q45 is different than all the other Q45
It took the dealer a couple of days to come up with part #
I have not installed the sensor yet but I can see it and the sensor is right ware it should be.My Q45 runs great but it has code
bdl
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goody90q45
Fly Me to the Moon
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2514 posts
90Q45
Orangevale CA
8-17-2005
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| « Re: (bdl) | 6:09 AM 11/7/2009 |
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| Quote, originally posted by bdl » | | If you go to the service manual for a 1996 Q45..... |
It looks like you've done your homework. What we're all used to referring to as the CAS is called the camshaft position sensor in the 96 FSM EC-9. The Crankshaft Angle Sensor is indeed bell housing mounted and measures gaps in the flywheel teeth to sense engine speed. From the FSM EC-189 "The sensor is not directly used to control the engine system. It is used for the onboard diagnosis of misfire." Q45T*ch hinted that the codes may be related and that the knock sensor is causing both and should be replaced first. You may find that the CAS code is related to the dead KS. The sensor looks easy to unplug and remove- one bolt. Ohm testing with a voltmeter and inspection of the part are simple (EC-192) and could save you the $100+ you've spent.
Mike "Goody" Goodwin 90 Q45 Base 246,000 miles
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bdl
Offline
7 posts
Q45
highland village tx
10-20-2009
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| « Re: (goody90q45) | 2:22 PM 11/7/2009 |
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Thanks for your help Mike
I will still replace the crankshaft position sensor first because it looks
easy to replace.I was going to do it today but when my wife drove the Q45 home last night the brake lights would not shut off.I thought it would be the brake light switch.WRONG It turned out tobe a plastic bumper that the
switch rests on.So I had to manufacture a new piece out of plastic (dealers were closed)
works great alittle time consuming though
I have owned this Q45 for 4 years never had any problems until now by the way Genuine Infiniti parts had the CKPS for $43
for that price I will RR
bdlModified by bdl at 7:28 PM 11/7/2009
Modified by bdl at 7:46 PM 11/7/2009
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goody90q45
Fly Me to the Moon
Offline
2514 posts
90Q45
Orangevale CA
8-17-2005
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| « Re: (bdl) | 6:21 AM 11/8/2009 |
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Could you ohm test the old and new parts at the bench and post results for future reference? It's a quick test- one probe on each pin with voltmeter in ohm setting. Thanks.
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bdl
Offline
7 posts
Q45
highland village tx
10-20-2009
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| « Re: (goody90q45) | 5:14 AM 11/15/2009 |
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I checked the resistance on the old CSPS it had a open no reading
should be 166-203 ohms.Looks like I may have got lucky
new CSPS is installed cleared codes have not come back yet
Q45 still runs great always did
bdl
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