I'm in the process of troubleshooting Shift Assist problems with my 2015 S1000RR.
Can anyone provide the pin-out and electrical specifications for the shift rod sensor (23418549125)? It would be helpful to know which pins are Vref, Vsignal, and ground, and what the expected Vsignal levels are supposed to be.
I think I've narrowed it down to part failure, but would like to confirm before I start spending money on replacement parts.
For the interested, curious, or anyone who might have other troubleshooting ideas, here is where I'm at:
1. Clutch micro-switches are good. Action confirmed via GS-911. Action is tight, no bump or wind activation. Yes, it has modified levers (2014 HP levers).
2. Gear adaptations have been reset with GS-911. Multiple times.
3. Throttle twist grip adaptations have been reset with GS-911.
4. Wiring harness continuity from ECU to shift rod connector has been confirmed. An intermittent failure that only presents when hot or being vibrated might have been missed. Now that the failure appears consistent, will check this again.
5. Connectors at ECU and shift rod have been cleaned and greased. (Separate forum had reports of FOD in the connectors)
Symptoms: Failure now presents as consistent (I think), but over the preceding months it had been intermittent. After starting the bike, upshifting with shift assist works perfectly. Can run it up multiple gears with quickshifter, bring it back down by clutch, and go back up again with quickshifter. However, downshifting with the quickshifter fails the first time (now). Once that failure occurs, all quickshifting, both up and down, stops working. Power-cycle everything, restart, and quick upshifting comes back on.
Speculation: The downshift (compression) sensor channel has failed.
When originally troubleshooting this, GS-911 reported:
21F672 : Shift lever sensor, implausible voltage
....ADC voltage Gear lever position sensor channel 1 : 3.64 V
....ADC voltage Gear lever position sensor channel 2 : 3.58 V
....Gear position sensor voltage : 0.28 V
21F670 : Shift lever sensor, voltage above threshold
....ADC voltage Gear lever position sensor channel 1 : 3.67 V
....ADC voltage Gear lever position sensor channel 2 : 3.63 V
....Gear position sensor voltage : 0.28 V
21F671 : Shift lever sensor, voltage below threshold
....ADC voltage Gear lever position sensor channel 1 : 0.06 V
....ADC voltage Gear lever position sensor channel 2 : 0.05 V
....Gear position sensor voltage : 0.74 V
I am no longer getting these errors. My speculation is that previously, when it stopped working, I was continuing to press/pull the foot lever, hoping it would restart. This repeated pressure might have generated some ECU unhappiness. Now, I'm smart enough to stop banging on it. I'm speculating that this is erroneous post-failure data, not a record of the failure itself. But I don't really know. I don't even know if the "ADC voltage gear lever positions sensor channels" are coming from the Shift Assist sensor. Would appreciate any insights from others.
Without any additional ideas, next step will be to replace the sensor. Still debating whether to go for a used OEM ($250 ebay), or a new HM strain gauge Quickshifter ($500) . If I knew for sure that replacing it would fix the problem, I'd easily go for the HM and eliminate the OEM's "squishiness."
Would appreciate any thoughts or opinions.
Can anyone provide the pin-out and electrical specifications for the shift rod sensor (23418549125)? It would be helpful to know which pins are Vref, Vsignal, and ground, and what the expected Vsignal levels are supposed to be.
I think I've narrowed it down to part failure, but would like to confirm before I start spending money on replacement parts.
For the interested, curious, or anyone who might have other troubleshooting ideas, here is where I'm at:
1. Clutch micro-switches are good. Action confirmed via GS-911. Action is tight, no bump or wind activation. Yes, it has modified levers (2014 HP levers).
2. Gear adaptations have been reset with GS-911. Multiple times.
3. Throttle twist grip adaptations have been reset with GS-911.
4. Wiring harness continuity from ECU to shift rod connector has been confirmed. An intermittent failure that only presents when hot or being vibrated might have been missed. Now that the failure appears consistent, will check this again.
5. Connectors at ECU and shift rod have been cleaned and greased. (Separate forum had reports of FOD in the connectors)
Symptoms: Failure now presents as consistent (I think), but over the preceding months it had been intermittent. After starting the bike, upshifting with shift assist works perfectly. Can run it up multiple gears with quickshifter, bring it back down by clutch, and go back up again with quickshifter. However, downshifting with the quickshifter fails the first time (now). Once that failure occurs, all quickshifting, both up and down, stops working. Power-cycle everything, restart, and quick upshifting comes back on.
Speculation: The downshift (compression) sensor channel has failed.
When originally troubleshooting this, GS-911 reported:
21F672 : Shift lever sensor, implausible voltage
....ADC voltage Gear lever position sensor channel 1 : 3.64 V
....ADC voltage Gear lever position sensor channel 2 : 3.58 V
....Gear position sensor voltage : 0.28 V
21F670 : Shift lever sensor, voltage above threshold
....ADC voltage Gear lever position sensor channel 1 : 3.67 V
....ADC voltage Gear lever position sensor channel 2 : 3.63 V
....Gear position sensor voltage : 0.28 V
21F671 : Shift lever sensor, voltage below threshold
....ADC voltage Gear lever position sensor channel 1 : 0.06 V
....ADC voltage Gear lever position sensor channel 2 : 0.05 V
....Gear position sensor voltage : 0.74 V
I am no longer getting these errors. My speculation is that previously, when it stopped working, I was continuing to press/pull the foot lever, hoping it would restart. This repeated pressure might have generated some ECU unhappiness. Now, I'm smart enough to stop banging on it. I'm speculating that this is erroneous post-failure data, not a record of the failure itself. But I don't really know. I don't even know if the "ADC voltage gear lever positions sensor channels" are coming from the Shift Assist sensor. Would appreciate any insights from others.
Without any additional ideas, next step will be to replace the sensor. Still debating whether to go for a used OEM ($250 ebay), or a new HM strain gauge Quickshifter ($500) . If I knew for sure that replacing it would fix the problem, I'd easily go for the HM and eliminate the OEM's "squishiness."
Would appreciate any thoughts or opinions.
