Roger 04 RT
Registered user
The Motronic MA 2.4 can be reset by removing Fuse 5 or disconnecting the battery. Resetting clears out fueling corrections know as Lambda Control Factors and Long Term Fuel trims. Resetting also clears out the TPS voltage range which has to be relearned by rotating the throttle fully from stop to stop with the key on, engine not running, immediately after reset. Today I stumbled upon a third function that can be cleared, an Immobilizer function--a software lock that keeps the R1150 from starting.
By stumbling on the Immobilzer function I was able to measure how long Fuse 5 (or the battery) has to be removed until the Motronic is reset.
Backing up for a minute, I've had a new HES on hand for over 6 months and finally got around to installing it. The project requires pulling the plastic, fuel tank, alternator belt, crankshaft pulley and then the HES. Everything is reinstalled in reverse order, including re-tensioning the alternator belt to 8 NM, retorqueing to spec half a dozen bolts, and in my case replacing the alternator belt tensioning mechanism due to damaging it last time I tensioned the belt.
It was time consuming enough that I decided to attach the GS-911 and test the new HES before reinstalling the fuel tank. The new HES tested fine and just as I was wrapping up the phone rang and I stopped for lunch. An hour later I went back out, installed the fuel tank, removed the flywheel locking pin and hit the starter button to check the engine before buttoning everything up. Five tries with the starter button produced the same result: DOA, not as much as a stumble.
To make things more complicated I had redressed the wire harness running from the left handle bar because its sheathing had cracked and split.
I had that sick feeling, what had I broken: was my new HES bad, had I broken a wire in the redressed harness, or was there a problem with the fuel tank reinstall. Checked the fuel line return volume, plenty of fuel. Checked the sidestand, and RID display, all normal. Fuel pump on with key on. Wiggled the wire harness. Had the GS-911 HES test glitched the Motronic? Fuse 5 pulled for half a minute. Nothing, nada.
Forty-five minutes later it hit me, the GS-911 HES test must have locked out the Motronic. It had, and there was a simple GS-911 procedure to unlock it. Touched the starter button, cranked over once or twice, it fired right up.
The Motronic has an Immobilzer function whose state is saved in memory.
After sleeping on it I realized that I had stumbled on a way to know for sure that the Motronic was reset. A way to know that the Adaptives for fueling were cleared. I went back out to the garage and put the bike into HES test mode and tried to start the bike. No go.
To figure out the time required for a full reset, I pulled Fuse 5 for 15 seconds, 30 seconds, one minute and two minutes. In each case, the bike could not be started, therefore the memory had not been reset because the Motronic still had enough charge to keep the memory alive. Finally I pulled Fuse 5 for 5 minutes, reinstalled it, hit the start button and the bike fired right up. So to reset the Motronic, at least 5 minutes--to be sure I'd leave the fuse out 10 minutes, then reinstall and relearn the TPS range.
Motronic MA 2.4 Reset Time: Remove Fuse 5 for 10 minutes. This also means if you're quick you can disconnect battery ground briefly without resetting the Motronic.
By stumbling on the Immobilzer function I was able to measure how long Fuse 5 (or the battery) has to be removed until the Motronic is reset.
Backing up for a minute, I've had a new HES on hand for over 6 months and finally got around to installing it. The project requires pulling the plastic, fuel tank, alternator belt, crankshaft pulley and then the HES. Everything is reinstalled in reverse order, including re-tensioning the alternator belt to 8 NM, retorqueing to spec half a dozen bolts, and in my case replacing the alternator belt tensioning mechanism due to damaging it last time I tensioned the belt.
It was time consuming enough that I decided to attach the GS-911 and test the new HES before reinstalling the fuel tank. The new HES tested fine and just as I was wrapping up the phone rang and I stopped for lunch. An hour later I went back out, installed the fuel tank, removed the flywheel locking pin and hit the starter button to check the engine before buttoning everything up. Five tries with the starter button produced the same result: DOA, not as much as a stumble.
To make things more complicated I had redressed the wire harness running from the left handle bar because its sheathing had cracked and split.
I had that sick feeling, what had I broken: was my new HES bad, had I broken a wire in the redressed harness, or was there a problem with the fuel tank reinstall. Checked the fuel line return volume, plenty of fuel. Checked the sidestand, and RID display, all normal. Fuel pump on with key on. Wiggled the wire harness. Had the GS-911 HES test glitched the Motronic? Fuse 5 pulled for half a minute. Nothing, nada.
Forty-five minutes later it hit me, the GS-911 HES test must have locked out the Motronic. It had, and there was a simple GS-911 procedure to unlock it. Touched the starter button, cranked over once or twice, it fired right up.
The Motronic has an Immobilzer function whose state is saved in memory.
After sleeping on it I realized that I had stumbled on a way to know for sure that the Motronic was reset. A way to know that the Adaptives for fueling were cleared. I went back out to the garage and put the bike into HES test mode and tried to start the bike. No go.
To figure out the time required for a full reset, I pulled Fuse 5 for 15 seconds, 30 seconds, one minute and two minutes. In each case, the bike could not be started, therefore the memory had not been reset because the Motronic still had enough charge to keep the memory alive. Finally I pulled Fuse 5 for 5 minutes, reinstalled it, hit the start button and the bike fired right up. So to reset the Motronic, at least 5 minutes--to be sure I'd leave the fuse out 10 minutes, then reinstall and relearn the TPS range.
Motronic MA 2.4 Reset Time: Remove Fuse 5 for 10 minutes. This also means if you're quick you can disconnect battery ground briefly without resetting the Motronic.
