Quickshifter

[Jetboy15]

So I’m currently trying to diagnose a problem with my 2020 BMW 1250 GSA quickshifter.

The gear selector locks during a downshift….intermittently.

The ECU takes its info for a downshift from the throttle twist grip sensor, the rear wheel speed sensor and the load applied to the shift assistant pro module, to cut the load to the gearbox.

I’ve done a wiggle test on the wiring going to the throttle unit. When wiggling the wire and the connector and moving the handlebars full lock in both directions, the twist grip position on the live values shows a reading. But only between 0.02 and 0.65%. That’s only wiggling the wire and not touching the throttle.

Is this enough to cause a problem with sending a zero, “the throttle is at idle” message to the ECU and is it likely to be the throttle unit or the connector.

Cheers…JB

[botus]

So I’m currently trying to diagnose a problem with my 2020 BMW 1250 GSA quickshifter.

The gear selector locks during a downshift….intermittently.

The ECU takes its info for a downshift from the throttle twist grip sensor, the rear wheel speed sensor and the load applied to the shift assistant pro module, to cut the load to the gearbox.

I’ve done a wiggle test on the wiring going to the throttle unit. When wiggling the wire and the connector and moving the handlebars full lock in both directions, the twist grip position on the live values shows a reading. But only between 0.02 and 0.65%. That’s only wiggling the wire and not touching the throttle.

Is this enough to cause a problem with sending a zero, “the throttle is at idle” message to the ECU and is it likely to be the throttle unit or the connector.

Cheers…JB

there is a TIPS doc for the USA market stating the pins may not be clipped in the pin bush housing on the multiplug connector for the twist grip - affects most models across quite a few years, and is due to nasty build quality of the loom

if you check that - don't forget to recalibrate the grip and the throttle body

wiring breaks on the actual shift assit gadget on the gear linkage is normal as the miles pick up (anywhere from 7 to 15 K miles dead shift assist is normal on a BMW