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14th March 2013, 05:02 PM
#91
Rotaredom
Originally Posted by
ckh
But I still cant figure out why, before he touched it, the problem was the converter wasnt locking up, after he did the converter, cant get into diagnostic mode, so from the time i dropped it off to the time it got back to me, something happened to stop it from going into diag mode... he said if it was his car he wouldnt worry about it, i said its not your car its mine and i am worried about it...
It may be the case that the diagnostic mode is still working but is giving you a different error to the one you had before it went in for repair.
Without actually seeing you do the test I cant say for certain that it is or isn't going into diagnostic mode, from what you have said it sounds like it is still going into DM and giving you an error
Time is never wasted when your wasted all the time
WARNING: Towballs used for recoveries can, and do kill people and damage property.
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14th March 2013 05:02 PM
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15th March 2013, 08:27 PM
#92
resolved lock up flaring but replacing the speed sensor
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The Following 2 Users Say Thank You to ckh For This Useful Post:
Alitis007 (15th March 2013), NissanGQ4.2 (15th March 2013)
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15th March 2013, 09:41 PM
#93
Legendary
Cant get auto transmission in 89 GQ auto to go into diagnostic mode.
I bet you feel like a massive weight had been lifted from your shoulders!! NOW GO OUT AND ENJOY!!!!
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15th March 2013, 10:05 PM
#94
Patrol God
Hello from Under Down Under!
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16th March 2013, 02:06 PM
#95
Originally Posted by
ckh
resolved lock up flaring but replacing the speed sensor
had to go for a long drive to do a job today, after about 20min driving the flaring is back... but not as bad..
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16th March 2013, 04:07 PM
#96
Rotaredom
Very interesting indeed
Am also interested in the "330 ohm resistor trick" to fool the tcu into thinking its at the correct temp.
Don't recall reading or hearing anyone do that before
Time is never wasted when your wasted all the time
WARNING: Towballs used for recoveries can, and do kill people and damage property.
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16th March 2013, 04:25 PM
#97
Originally Posted by
NissanGQ4.2
Very interesting indeed
Am also interested in the "330 ohm resistor trick" to fool the tcu into thinking its at the correct temp.
Don't recall reading or hearing anyone do that before
Found it on another forum...Took a measurement of the temp sensor loom resistance and it wasn't good (reading open circuit). Either way, I preceed with the plan & measured the voltage across pin 12 of the TCM (PURPLE WIRE). At first the reading were normal ie 1.56v when cold. I took the car for drive whilst monitoring the multimeter & could see the voltage dropping as the box warmed up (all normal). However, not long after the voltage went from .96v straight to 2.57v & the problem occurred ie no 4th gear. I toggled the battery isolation switch as I've done many times in the past and the voltage went back down to .95v - welcome back 4th gear. Seems the temp sensor was going o/c intermittently confusing the TCM.
I've added some photos of what I've done to by-pass the issue so others can avoid the expense (TPS & Revolution sensor which I've done in vain) & over-all trouble.
1) You'll need to get yourself a 330ohm resistor ( I went with a 1watt which I think is overkill) but for 45cents you get enough to do your truck & a mates!
2) On my GQ the terminal block which houses most if not all the wiring for the transmission & is the 'BROWN CONNECTOR' which is in the middle (see pic).
3) Once you've disconnected the terminal you need to find the 'BLACK & WHITE' wire both of which are smack bang in the middle. I cut both with a little extra length then soldered the resistor & little wire in a loop back to the wires which were previously cut. To finish, I added some heat shrink to protect the resistor & to make it look tidy.
4) Once done, reconnnect the all wiring & verify your work by measuring across pin 12 of the TCM & ground (ignition on). If you get .46v (or there abouts) you've got 2 thumbs up!!!
By installing the resistor you negate the need to drop all your tranny fluid, remove the pan & most important spend a squillion dollars at nissan. All the resistor does is make the tranny believe it's hot/ warm from the get go. So keep it in mind and try avoid getting to speeds which will 'lock the torque converter' before it's had enough time to warm up.
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