renix cruise troubleshooting without tester?

[watchamakalit]

I have all my cruise components installed but it won't engage.  All the info I'm finding says to connect the amc tester to test function of the module.  Is there a way to test it without said tool? 

[87MJTIM]

There are number of tests you can perform with just a DVOM and a test light.  The module just helps narrow down the places to test.

 

The steps are detailed in the 88 electric service manual.

[eaglescout526]

Pretty much what 87 said. A test light can do quite a bit but something that it can’t do is trigger the solenoid to engage which makes it challenging if you need to test the solenoid. 
 

Do you have factory installed parts, your own from a donor or one of my kits? 

[watchamakalit]

Donor. Came from a parted xj. I'll look in the electric manual. Didn't think about it for some reason.

[eaglescout526]

Both electric manual and FSM have testing procedures for cruise control. 8/10 times it’s the control box. The other 2/10 is things that rarely fail or a vac leak. 

[watchamakalit]

Is there a way to test the vac side with a vac pump?  If I pull vac at the servo it should hold correct?  Just thinking of ways to narrow it down.  I was told by the seller of my cruise stuff that he never had it working so no idea if the brain is even any good.  I am going to Rons on sunday.  I think he has a brain box or 6...

[eaglescout526]

3 hours ago, watchamakalit said:

I think he has a brain box or 6

I might actually have him beat there. But you should be able to test the servo and the lines with a vac pump. I recommend trying to give the servo power while using the vac pump to verify the servos internals are working.