SyncroRev Match not working

phunk

If S-Mode faults, and cruise control doesnt work, its going to be the top clutch pedal switch. The cruise would have been non-functional for a while, you just might not notice it. If the top switch is not making fully closed contact than the vehicle controls are unable to tell when you are on/off the clutch pedal, so of course cruise and S-Mode could not work.

The top switch is not to be confused with the bottom switch, which is used to allow the engine starter to engage.

Top switch adjustment might be needed after doing clutch related work. It will also often need adjusting after installing and even after changing adjustment to the RJM adjustable pedal.

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Jmatchley86

so after a master cylinder replacement this could of been bumped?

I ask because the chain of events is this:

CSC and Master cylinder replacement

Track day with 0 issues

track day with my shift mistake

Ecu solves problem temporarily so its still messed up somewhere.

Could this still be the top switch? i put my hand up there and felt alot of pressure from the rubber stopper to the switch that goes in.

Thanks for your help too!

phunk

Check if your cruise control works or not. If the cruise control doesnt work, then it is almost definitely the top clutch switch.

This could definitely happen due to a master cylinder replacement. Anything that could effect the stroke of the clutch pedal can cause the switches to need re-positioning.

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Tazrek

Apologies for reviving an old thread, however I’m running into a similar issue with Rev match.

CMAK Kit was just installed along with upgraded clutch. Rev match and cruise control DO work however, the engine no longer revs when moving the stick shift to the right and/or left. Prior to the CMAK, while in neutral preparing to downshift, I could move the stick shift to the left and the engine would rev thinking I was going to put it in 1st or 2nd. Now Rev Match will only work once I actually downshift into the gear.

Is this due to the CMAK Kit or should this still be working?

gomer_110

Rev-match should work fine even with the CMAK. First guess is something didn't get reinstalled correctly when the transmission was put back in.

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'17 Titan Bone Stock

phunk

Yup, Rev Match should still work. Rev match is a function of the engine control system, and it doesnt have any way to realize that the clutch or its hydraulic system has change.

Rev match uses wheel speed, engine speed, input shaft speed, and shifter X/Y position change to determine what it wants to do. Since you would have other obvious consequences to losing wheel speed or engine speed sensing, you can really just consider the sensors and switches dedicated to rev match. If your gauge cluster is accurately determining what gear you are in, you can easily assume the shifter position sensor is working fine. If your input shaft sensor was not plugged in, I am pretty sure but not 100% confident there is a DTC code you will get for that. Do you have a way to plug in and read the input shaft speed sensor? I cannot remember if UpRev or ECUTEK logs this sensor.

As usual when diagnosing Rev match problems, I bet your clutch pedal top switch just needs adjustment after all the changes. This switch is what decides when to engage rev match (when rev match is turned on), and if this switch position isnt double checked and adjusted as necessary, rev match will go down with changes that effect the pedal position, which can happen with changes to the hydraulic system.

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THE BULL

Being that the CSC was replaced I'd take a look at the input shaft VSS sensor on the trans and the Gear position sensor on the transmission to make sure wiring is intact and sensors are not broken.
Other than this and confirming CPP is working it should be working.

For the OP, after such events and multiple clutch pedal presses vibration is your enemy.

halonut

yes, my CC has gone out twice & both times it was one that silicone/plastic plugs that activate the switches that disintegrated. there is one on the clutch pedal to deactivate CC when the pedal is depressed & if it's missing the CC system thinks the clutch is in all the time. since you replaced the clutch pedal assy with an a/m unit that may be the cause of that. The brake pedal has two of the silicone plugs one to turn on brake lights & one to cancel CC.

sorry, don't know about the s-mode problem.

1slow370

on the not reving when moving the shifter to the left you may have to do the gear position sensor relear procedure in the fsm

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