Troubleshooting a no-crank issue

[sapote]

From this, I think the PLCD output is a sinusoidal signal and the TCM has to keep track the number of the sine cycles and phase to know the slave position. I think the computer resets the counter when the slave has no oil pressure, then counting the sine way cycles and phase. The engineers used the simple coil generated sine wave for more reliable in the oil enviroment instead of linear digital encoder. But why the connector needs to have 3 pins, when the sinewave only needs 2 pins output?
Btw, the slave rod must be moving fairly quick to generate a decent sinewave, as if it was pushed by our leg on the pedal slowly then the coil cannot generate the needed signal.

[sapote]

The flow-chart in post #28 clearly shows the slave position must be at the pushed position in order for the SMG to tell the ews to enable starter.
The SMG must communicate to the ews about the "ok" via CANbus (pin13) when these conditions are met: oil pressure, brake, pushed slave, gear in neutral.

In your case, I would check if the clutch was pushed during key turned to start.

[E46m3zcp]

Regarding TIS information, there is some misleading stuff in it. For example, it is NOT possible to start the car if it's in neutral without pressing the brake (I just went to my car to double-check). The brake must always be pressed. I suspect there may be regional variations due to regulations, and TIS is talking about Euro cars.

Regarding 0/N distinction, it is confusing. There must be a diagram in TIS specifying what they mean, but I suspect that 0 is the rest position of the lever while driving, and N is neutral (towards the left). The confusion arises from the fact that some instrument clusters represent the neutral as with a "0" instead of an "N," but I think this nomenclature is unrelated. Their position "0" must be "D" (if you will call it like that, the position that means drive forward), and N is, well, Neutral.

By the way, my problem is long solved, so I'm no longer looking into this, but it's still interesting just for the sake of our understanding. I think that your explanation makes sense, but instead of a CAN message, I would have done it through pin 8 if it were me. Make the TCM send a digital signal (boolean 1/0) to pin 8 and emulate the clutch switch of a manual; it seems to me like this would have been the simplest design. Are you positive that pin 8 is unplugged in SMGs?

[sapote]

By the way, my problem is long solved, so I'm no longer looking into this, but it's still interesting just for the sake of our understanding. I think that your explanation makes sense, but instead of a CAN message, I would have done it through pin 8 if it were me. Make the TCM send a digital signal (boolean 1/0) to pin 8 and emulate the clutch switch of a manual; it seems to me like this would have been the simplest design. Are you positive that pin 8 is unplugged in SMGs?

What caused the no crank problem?
pin8 only used for pedal switch based on this.

[E46m3zcp]

I don't understand that comment about the diagram. What do S805 and X13635 represent?
Is this diagram specific to the SMG?


My problem was the ignition switch. I solved the problem by opening it and cleaning the contacts inside. I still cannot explain why I had the symptoms I was showing in the video earler (cyclic engage/disengage of the clutch).

[sapote]

I don't understand that comment about the diagram. What do S805 and X13635 represent?
Is this diagram specific to the SMG?

S805 is the clutch pedal switch and x13635 is the connector to it. So, the diagram is not just for SMG. This also means for SMG (no 3rd pedal) pin8 is unconnected.

[E46m3zcp]

This also means for SMG (no 3rd pedal) pin8 is unconnected.

Yeah, I'm following. If S805 is the clutch switch, and SMG has no clutch switch, then this must only be for the manual. I'm still wondering if that's really what is implemented (after all the ambiguous stuff I've come across in TIS and technical doc, I'm not sure anymore), and the only way to know it for sure would be to take a look at the connector. Maybe I'll do it and report back.