04-26-2018, 09:38 AM
Two common methods of homing a stepper motor are:
1. Run to limit/end of travel switch
2. Monitor current, which will increase if run to a hard stop (see link)
http://www.orientalmotor.com/stepper-mot...oming.html
My experience is limited to industrial applications, hence the above link.
I do not know which method Honda employs.
With a 4 wire connection,1 is possible.
The schematic shows
IACV1A to ECM A6 (black/yellow)
IACV1B to ECM A7 (black/red)
IACV2A to ECM A17 (black/blue)
IACV2B to ECM A16 (black/orange)
Both circuits (black/yellow to black/red and black/blue to black/orange) have the same resistance parameters of 91-121 ohms at 77 F, so I am thinking 1 is not as likely as 2.
Does the FSM advise anything further (other than info on FSM pages 5-74, 5-75, 15-41 & 15-42)?
In possibility 1, if the switch has moved, damaged, etc., true home would be lost.
In possibility 2, if there is binding, there could be a premature higher current read.
Both of these could occur even if the stepper motor is functioning normal.
My hat is off to you, John!
Kudos for the offer.
Dave
Did you find any carbon/crud/partial blockage in the port controlled by the IACV?
1. Run to limit/end of travel switch
2. Monitor current, which will increase if run to a hard stop (see link)
http://www.orientalmotor.com/stepper-mot...oming.html
My experience is limited to industrial applications, hence the above link.
I do not know which method Honda employs.
With a 4 wire connection,1 is possible.
The schematic shows
IACV1A to ECM A6 (black/yellow)
IACV1B to ECM A7 (black/red)
IACV2A to ECM A17 (black/blue)
IACV2B to ECM A16 (black/orange)
Both circuits (black/yellow to black/red and black/blue to black/orange) have the same resistance parameters of 91-121 ohms at 77 F, so I am thinking 1 is not as likely as 2.
Does the FSM advise anything further (other than info on FSM pages 5-74, 5-75, 15-41 & 15-42)?
In possibility 1, if the switch has moved, damaged, etc., true home would be lost.
In possibility 2, if there is binding, there could be a premature higher current read.
Both of these could occur even if the stepper motor is functioning normal.
(04-26-2018, 01:32 AM)Magnus_imp Wrote: Dave,
If you run into any trouble I'm in San Diego as well and did the IACV a while ago as you probably know. I think I remember most of it. Sounds like you have a good hand on it and are taking it slow. But if you get truly stuck I'll be around this weekend. I could bring my CB so you can compare parts/wiring locations if you get lost. Eight Five Eight Nine 6 7 5 4 Eight 0
- John
My hat is off to you, John!
Kudos for the offer.
Dave
Did you find any carbon/crud/partial blockage in the port controlled by the IACV?