87 Maxima crankshaft sensor question,need some help,pease!!
#1
87 Maxima crankshaft sensor question,need some help,please!!
Well,I'm stumped....I have a no start situation with my '87 Maxima with VG30e motor. I have no mode III codes on my ECU except 44.I've tested the iginition,coil,MAF,CTS,new cap,rotor,plugs. I'm using the FSM and think I have have narrowed the problem to either the ECU or the Crank sensor. The logic probe (while cranking the engine) test reults yeilded the following results: pin 8(1 degree signal) I got a solid green LED,which,per the probes instructions,indicates,the probe is touching electrical ground or a logic Low signal (below 2v). For the pin 17 (120 degree signal)reading I got solid green and a flashing red LED's,which means the probe is touching a low frequency curcuit. I then did the continuity check between those two wires and the crank sensor harness end and they checked fine......Should the wire to pin 8 have pulsed like the other wire to pin 17?Is this a bad ECU? Do I need to run a jumper from the crank sensor to pin 8 to test the curcuit? I'm not too proficient with electronics and need some help here,as the car has been down two weeks.....Many thanks in advance!...
Last edited by 87nissanmaxima; 06-04-2013 at 02:05 PM.
#2
Well,I'm stumped....I have a no start situation with my '87 Maxima with VG30e motor. I have no mode III codes on my ECU except 44.I've tested the iginition,coil,MAF,CTS,new cap,rotor,plugs. I'm using the FSM and think I have have narrowed the problem to either the ECU or the Crank sensor. The logic probe (while cranking the engine) test reults yeilded the following results: pin 8(1 degree signal) I got a solid green LED,which,per the probes instructions,indicates,the probe is touching electrical ground or a logic Low signal (below 2v). For the pin 17 (120 degree signal)reading I got solid green and a flashing red LED's,which means the probe is touching a low frequency curcuit. I then did the continuity check between those two wires and the crank sensor harness end and they checked fine......Should the wire to pin 8 have pulsed like the other wire to pin 17?Is this a bad ECU? Do I need to run a jumper from the crank sensor to pin 8 to test the curcuit? I'm not too proficient with electronics and need some help here,as the car has been down two weeks.....Many thanks in advance!...
I have a thread on here that shows my details with this same problem. It's the cam position sensor. Replace it and u will be good to go!!
#3
Thanks for the reply. I replaced the crank sensor with a new one last September,could it be bad already? Last time it went bad I got the code 11 for it......But I read your post and you had a code 44 with no start and a bad crank sensor,so I guess I'll buy another new one or a used distributor with the sensor intact...I've ordered a replacement ECU and coil off Ebay in case it was either of those.....Curious the no code situation,I guess parts of the ECU age along with the sensors....
#4
Solved!!!You were right,LastTrain,it was the dang crank sensor again...Found my NAPA receipt for the bad one and got a new one replaced under warranty....Apparently,some of the epoxy on the bottom of the sensor was flaking off and screwing things up because I found dust when I pulled the sensor out. The new sensor is sealed completely,so this shouldn't occur again....Took three weeks and alot of testing and cleaning,but at least I know a helluva lot more about my Maxima...Thanks again LastTrain,If you were here,I'd buy you a Guiness....!
Last edited by 87nissanmaxima; 06-05-2013 at 06:11 PM.
#6
Solved!!!You were right,LastTrain,it was the dang crank sensor again...Found my NAPA receipt for the bad one and got a new one replaced under warranty....Apparently,some of the epoxy on the bottom of the sensor was flaking off and screwing things up because I found dust when I pulled the sensor out. The new sensor is sealed completely,so this shouldn't occur again....Took three weeks and alot of testing and cleaning,but at least I know a helluva lot more about my Maxima...Thanks again LastTrain,If you were here,I'd buy you a Guiness....!
I am looking for a new reliable sensor that won't die out so soon. Do you remember the first and second sensors you got at Napa?
http://www.napaonline.com/Catalog/Ca...701_0257179771
http://www.napaonline.com/Catalog/Ca...418_0336133867
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