Dirt in the cruise set button?
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Just some thoughts as I read your post. The fact that it will engage tells me all the switches and wiring are most likely ok. Seeing it won't engage until 70 makes me THINK the module is not seeing a correct speedo siganal as it should engage at about 30. So IF it were just that issue it should hold at 70 then, unless the speedo signal is erratic. Imagine when you are going 70 it thinks you are going 40 then 35 then 30 then 20 and it cuts out because 20 is too slow. So you are saying that at 70 in fourth it engages but slowly loses speed then shuts off? What speed does it shut off? If around 30 I would think the speedo signal might be OK then as that's when it should disengage.
I think the fact that it will not set indicates that it is an electric or electronic problem. Not mechanical or vacuum related. I THINK if all of the mechaical and vacuum associated items were defective the set light should still light if all other things were satisfied. (brake switch, clutch switch, set switch etc.) So then the module would be sending a signal to the mechanical actuators but they couln't perform if they were defective BUT the set light would still illuminate...I think
The speedo on these things are weird. The actual speedo is mechaical driven by a cable. That signal is converted to a square wave pulse by a module and the electronic signal is what the cruise uses. So the fact that the speedo works only means the cable and mechanical parts are good.
I think you will get enough input to your post and bang it around enough that you will get it. Good luck....
Edit: If you look at the link below you can see item 27. That is where the mechanical speedo signal is converted to a square wave. I believe it is nothing but a square wave generator. That is a reluctor and pickup. I would make sure you have a regular signal there and at the cruise module to rule that part out.
http://www.hondapartshouse.com/oemparts/a/hon/506c9914f870023420a3e626/speedometer-tachometer
I think the fact that it will not set indicates that it is an electric or electronic problem. Not mechanical or vacuum related. I THINK if all of the mechaical and vacuum associated items were defective the set light should still light if all other things were satisfied. (brake switch, clutch switch, set switch etc.) So then the module would be sending a signal to the mechanical actuators but they couln't perform if they were defective BUT the set light would still illuminate...I think
The speedo on these things are weird. The actual speedo is mechaical driven by a cable. That signal is converted to a square wave pulse by a module and the electronic signal is what the cruise uses. So the fact that the speedo works only means the cable and mechanical parts are good.
I think you will get enough input to your post and bang it around enough that you will get it. Good luck....
Edit: If you look at the link below you can see item 27. That is where the mechanical speedo signal is converted to a square wave. I believe it is nothing but a square wave generator. That is a reluctor and pickup. I would make sure you have a regular signal there and at the cruise module to rule that part out.
http://www.hondapartshouse.com/oemparts/a/hon/506c9914f870023420a3e626/speedometer-tachometer
It really does sound like a speedo signal issue. Imagine that the cruise module sees 70 as 30 MPH. Mine is very touchy in that area and might kick out often. At 35 on the cruise (75 for you if the speedo is the issue) mine is rock solid. I attached a couple of tests you can do with a cheapy analog voltmeter. Hope they help. I'm sure there is a typo on the second test. Should read "if all test are not normal replace the sensor"
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