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Intermittent failure to start...

OK, after pulling the clutch sensor switch, taking it apart, and putting it back together, the issue seems to be resolved. However, after looking at the internals, I don't know

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Old 03-06-2013, 11:33 PM   #16 (permalink)
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OK, after pulling the clutch sensor switch, taking it apart, and putting it back together, the issue seems to be resolved. However, after looking at the internals, I don't know how the computer knew it was installed. There's no circuit components, just a simple disconnect. Hopefully this is actually the problem and not just the issue deciding to go away for a bit.
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Old 03-06-2013, 11:38 PM   #17 (permalink)
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Quote:
Originally Posted by SouthArk370Z View Post
If a bad clutch interlock switch is the problem, you can temporarily disconnect the connector on the switch and jury-rig your own switch until the replacement comes in. Flip your temporary switch to the proper position, start car, flip switch back to "normal" position until next start.

If you know what a 4-20mA loop is, you should be able to handle it.

Use at your own risk, not responsible for accidents or damage, &c, &c, &c.
Good idea, but it appears to have cleared up after taking apart the clutch switch and putting it back together. I have purposefully changed nothing though, so unless some piece of plastic or something was holding the connection closed, I have no idea how it's become fixed.
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Old 03-06-2013, 11:47 PM   #18 (permalink)
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Originally Posted by FearlessLeadr View Post
OK, after pulling the clutch sensor switch, taking it apart, and putting it back together, the issue seems to be resolved. However, after looking at the internals, I don't know how the computer knew it was installed. There's no circuit components, just a simple disconnect. Hopefully this is actually the problem and not just the issue deciding to go away for a bit.
Glad to hear it's working again. Keep the spare handy. It sounds like you fixed the problem (not just an intermittent that went away for a while), but the switch is likely to fail again soon.

According to the 2009 FSM, the interlock switch is a simple SPST switch - the module is looking for volts present or not. Some controls in the car are "smart", eg, window switches and SLU, but not the clutch interlock switch. Edit: Ie, the module doesn't know the switch is there until it closes.
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Old 03-07-2013, 12:11 AM   #19 (permalink)
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Quote:
Originally Posted by SouthArk370Z View Post
Glad to hear it's working again. Keep the spare handy. It sounds like you fixed the problem (not just an intermittent that went away for a while), but the switch is likely to fail again soon.

According to the 2009 FSM, the interlock switch is a simple SPST switch - the module is looking for volts present or not. Some controls in the car are "smart", eg, window switches and SLU, but not the clutch interlock switch. Edit: Ie, the module doesn't know the switch is there until it closes.
Then shouldn't that mean that I could disconnect the switch entirely? When I press the button, it breaks the circuit, so shouldn't it just think the clutch is pressed if I disconnect the switch? I also tried a wire bridge and it didn't work.
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Old 03-07-2013, 07:34 AM   #20 (permalink)
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Originally Posted by FearlessLeadr View Post
Then shouldn't that mean that I could disconnect the switch entirely? When I press the button, it breaks the circuit, so shouldn't it just think the clutch is pressed if I disconnect the switch? I also tried a wire bridge and it didn't work.
I think that the ECU needs to "see" the switch open and close when necessary. If the switch is bridged like you say to keep it closed permanently, then the ECU does not see the change in state. I know when I try to start my car, the dash icon lights up that says to depress the clutch (switch closed) and then the car starts. If the ECU does not see the switch close, then the car will not start. It is a programmed sequence that has to happen otherwise, nada.
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Old 03-07-2013, 08:03 AM   #21 (permalink)
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Then shouldn't that mean that I could disconnect the switch entirely? When I press the button, it breaks the circuit, so shouldn't it just think the clutch is pressed if I disconnect the switch? I also tried a wire bridge and it didn't work.
Since the bridge didn't work, it would seem that mults is right and the car has to see a transition. I suspected as much (it's not uncommon for interlock circuits), which is why I suggested using a switch.
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Old 03-07-2013, 02:35 PM   #22 (permalink)
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Originally Posted by SouthArk370Z View Post
Since the bridge didn't work, it would seem that mults is right and the car has to see a transition. I suspected as much (it's not uncommon for interlock circuits), which is why I suggested using a switch.
So, that means if I hold down my clutch, then start the car, then turn it off and try to start it again without releasing the clutch, shouldn't it not work?
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Old 03-07-2013, 03:15 PM   #23 (permalink)
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So, that means if I hold down my clutch, then start the car, then turn it off and try to start it again without releasing the clutch, shouldn't it not work?
Try it and see. I'm just going by the wiring diagrams and a lot of things disappear into the ECM/BCM/&c where only Nissan knows what happens. It appears that the car is looking for a transition, but it may be less (or more) complicated than that.
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Old 03-07-2013, 10:44 PM   #24 (permalink)
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Strange, well, it hasn't done anything like it, so that must have been the issue. I'll just have to last until the new part shows up. Thanks for the help and interest.
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Old 03-08-2013, 10:12 AM   #25 (permalink)
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Old 07-02-2013, 11:15 AM   #26 (permalink)
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sub'd.... I have the same issue....
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Old 10-07-2013, 10:38 AM   #27 (permalink)
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the same switch is also used to trigger SRM.

did any of you guys experience any sloppy shifts/SRM not doing its thing as expected when your clutch switch prevented the car from starting intermittently?

and for those who experimented with temporary fixes, did you encounter any irregular SRM behaviour?
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Old 10-07-2013, 10:59 AM   #28 (permalink)
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Quote:
Originally Posted by wheee! View Post
sub'd.... I have the same issue....
wow, forgot about this thread...

see here for solution:
Car won't start!...and it's not the Steering Lock...

Quote:
Originally Posted by juld0zer View Post
the same switch is also used to trigger SRM.

did any of you guys experience any sloppy shifts/SRM not doing its thing as expected when your clutch switch prevented the car from starting intermittently?

and for those who experimented with temporary fixes, did you encounter any irregular SRM behaviour?
Never had any issue with SRM....
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Old 10-09-2013, 06:58 PM   #29 (permalink)
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my SRM issue turned out to be the Input Speed Sensor on the gearbox. It had some blobs of fine metal particles stuck to it (it's a magnetic flux type device).

Cleaned it up and shifting has never felt so good

cheers for the reply though
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Old 10-10-2013, 02:15 PM   #30 (permalink)
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Hall effect sensors are notorious for failing after magnetic debris gathers on or near them....

Good find! Now swap out your tranny fluids to synthetic....
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