CIS Cold start valve excitation?

[Phil Payne]

> Can someone tell me the details of how the CSV is activated by
> it's control computer in my '88 5KCSTQ (CIS)? Bentley says there should be
> 12 v on terminal 1 of the CSV connector but it doesn't say whether this is
> true only while the CSV is activated. So my question is: Does CSV squirt
> when terminal 2 is grounded or when 12 V is delivered to terminal 1?

The cold start valve, wastegate frequency valve and fuel frequency valve are all powered from
a common 12V rail and actuated by the ECU rounding the other terminal.  The rail has its own
fuse, and I've seen two cases of cars with the fuse (along the side of the fusebox) being put
in the wrong location.

The best diagnostic approach is to use the "output diagnostics" described on Scott Mockry's
site.

--
  Phil Payne
  http://www.isham-research.com
  +44 7785 302 803