well, first off the cruise control ECU (in a LHD car -left hand
drive) is to the left of the steering column blocking the main relay.
As far as my troubleshooting goes, I guess I'm not yet there after
all, at least not 100%. I browsed around the internet for a
replacement cruise control ECU and the one's I found were "good" for
1990-1993 models. Going on this information I used my 1991 Accord
manual for the cruise control diagnostics and followed the steps.
There is a table for each wire going into the control unit and I
checked them all for either voltage or continuity to GND and almost
everything checks out. However, I found some interesting things that
I'm having a hard time explaining. If anyone can help that would be
I have the cruise control diagnostics for a 1990-1991 and a 1994
Accord. The only differences between the '91 and the '94 are 1) an
extra wire is used on the '91 model which supplies voltage to the ECU
when the engine is running, and 2) the '91 model has continuity to GND
when the clutch is PRESSED and the '94 model has continuity when the
clutch is NOT PRESSED.
My '93 however has a hole in the clutch where the push-button clutch
switch goes right through. It makes no sense that this hole is there,
so I'm guessing there was a stopper of sorts that must have fallen out.
I plugged it with a screw and when released (NOT PRESSED) I get
continuity, which is against what the '91 diagnostics say I should be
I must be mistaken that other model Accords have the same ECU, but I
don't know which to go on as I am missing my '93 manual. I tried both
states and neither fixed my cruise control problem. I checked the
diaphram on the actuator and the solenoid relays and they all check out
Also, for an Automatic car, this clutch wire is used for the same
purpose (can't engage cruise when not in the proper gear: 2, D3, D2).
So, I'm curious, as there is no difference in the troubleshooting, if
an Automatic ECU can be swapped for a Manual ECU.
Can anyone verify the output of the clutch switch when it is PRESSED
and NOT PRESSED for a 1993 Accord? I don't see another switch on the
clutch, so I'm curious if this switch also performs the start-check
which does not allow the car to start unless the clutch is in. Any
help or suggestions is greatly appreciated.