Hey all, I've got a post going on in the ghetto about my bike issues and I thought to drop the post here as well.
I've been in contact with Piaggio group Americas and have really good info and a really good video on testing the griso stepper motor (ICA).
The code came on about mid-trip for me and my idle was stuck at 2000 rpm while I had a misfire caused by broken plug caps on both cylinders. The issue still remains unresolved.
With the key in the on position and engine off (KOEO), according to the chart, I have the voltages you read and they should be as follows:
Pin A : 0 volts
Pin B: 3.3 Mv
Pin C: B+ 12V
Pin D : B+ 12v
Pin A to D should be 52 ohms and Pin B to C should also be 52 ohms.
I'd like to note that this was already written on paper and not my own results. Below is all of my own testing done.
Ecu Pins 17, 18, 19 and 9 all have 0.3 ohms to their respective pins on the ICA motor.
Load testing the wiring yields zero results using an h7 bulb.
Removing the ECM, Pin 9,18,17 all have 3k ohms to the body ground of the ECM, but pin 17 (Pin A on the ICA motor) is OL.
Key on resistance test show A at 105, B at OL, C at 2.1 mOhms, and D 52 ohms
Unplugged connector with the key on has B+ at Pins C and D only.
Are you still with me? Okay good; I have not been able to replicate the test results with everything hooked up consistently. Meaning, Pin A may provide me with b+ or it may provide me with 0 Volts. Depending on which way the motor was last driven, and the small amount of voltage will sometimes be on Pin C and sometimes on Pin B. I feel like the coil driving on those two pins are pushing it out but the coils on A and D are not able to pull the motor back in for some reason.
The one thing they all have in common is with the key turned off from an on position voltage will be present on all pins as the ECM tries to drive the motor. Many times I have been able to hear the motor operate, now, I hear absolutely nothing. The dealership I'm taking it too seems to think the harness is at fault, but with the testing ive performed im questioning it. They've also tried to replace the ICA already with the same results, and Piaggio has instructed them to replace the ECM. Now I am awaiting a phone call since they do not have the right ECU in stock.
I'm looking to see if anyone here can shed some light on this issue, have dealt with, or, can provide me with different testing procedures I may have overlooked.
I also have videos of all the testing I've performed, and videos of the ECM driving my IAC noid light, an IAC from a gm, and the ica from the griso.
Thanks!
I've been in contact with Piaggio group Americas and have really good info and a really good video on testing the griso stepper motor (ICA).
The code came on about mid-trip for me and my idle was stuck at 2000 rpm while I had a misfire caused by broken plug caps on both cylinders. The issue still remains unresolved.
With the key in the on position and engine off (KOEO), according to the chart, I have the voltages you read and they should be as follows:
Pin A : 0 volts
Pin B: 3.3 Mv
Pin C: B+ 12V
Pin D : B+ 12v
Pin A to D should be 52 ohms and Pin B to C should also be 52 ohms.
I'd like to note that this was already written on paper and not my own results. Below is all of my own testing done.
Ecu Pins 17, 18, 19 and 9 all have 0.3 ohms to their respective pins on the ICA motor.
Load testing the wiring yields zero results using an h7 bulb.
Removing the ECM, Pin 9,18,17 all have 3k ohms to the body ground of the ECM, but pin 17 (Pin A on the ICA motor) is OL.
Key on resistance test show A at 105, B at OL, C at 2.1 mOhms, and D 52 ohms
Unplugged connector with the key on has B+ at Pins C and D only.
Are you still with me? Okay good; I have not been able to replicate the test results with everything hooked up consistently. Meaning, Pin A may provide me with b+ or it may provide me with 0 Volts. Depending on which way the motor was last driven, and the small amount of voltage will sometimes be on Pin C and sometimes on Pin B. I feel like the coil driving on those two pins are pushing it out but the coils on A and D are not able to pull the motor back in for some reason.
The one thing they all have in common is with the key turned off from an on position voltage will be present on all pins as the ECM tries to drive the motor. Many times I have been able to hear the motor operate, now, I hear absolutely nothing. The dealership I'm taking it too seems to think the harness is at fault, but with the testing ive performed im questioning it. They've also tried to replace the ICA already with the same results, and Piaggio has instructed them to replace the ECM. Now I am awaiting a phone call since they do not have the right ECU in stock.
I'm looking to see if anyone here can shed some light on this issue, have dealt with, or, can provide me with different testing procedures I may have overlooked.
I also have videos of all the testing I've performed, and videos of the ECM driving my IAC noid light, an IAC from a gm, and the ica from the griso.
Thanks!