aftermarket cruise control help

[chris1981]

hi im trying to fit cruise control to a nissan terrano 2, 2.7tdi. ive been searching the internet and cannot find instructions on how to wire in the accelerator pedal as mine is fly by wire, if any one has fitted ? ive got a rg8 fly by wire kit if that helps

 

[solarman216]

best answer there is fit a micro switch with a lever on it so when pedal is touched it kicks cruise control out, fit it near the top so the movement is small for full pedal travel, or put a light spring on it, Rick

 

[chris1981]

i have wired the clutch and brake pedal switch to kick the cruise out but there are the wires that increase the speed and slow it down that connects to the accelerator wiring as im using a universal harness

 

[solarman216]

you will not be able to do this with fly by wire, best you can do is get the info from the control you are using re resistance at full throttle and resistance at idle and select a potentiometer within that range, but I would have thought that throttle open/throttle closed would be fine = switch, Rick

 

[rustic]

I haven't got cruise control, but I have used it on cars in the US.

Am I right in thinking that when Cruise Control is engaged, the only purpose of the throttle is to increase the speed of the vehicle momentarily while the throttle is pressed down. eg for overtaking a slower vehicle.
When you release the throttle the speed drops to the original setting, maintaining cruise control.

I don't know where I am going with this, but this signal needs to get to the Main Ecu via the Cruise control unit.
This may try to explain Rick's thinking.

But I would have thought that the throttle potentiometer is already there for the Main Ecu to work.

If I get chance I will check out the circuit diagram later on.

.

 

[lacroupade]

hi im trying to fit cruise control to a nissan terrano 2, 2.7tdi. ive been searching the internet and cannot find instructions on how to wire in the accelerator pedal as mine is fly by wire, if any one has fitted ? ive got a rg8 fly by wire kit if that helps

What unit have you got and where did you get it?

I have used Conrad Anderson several times and it takes them 5-6 hours do an install on a Terrano....you need a gearbox switch as well (can't recall what that does except I think it cuts cruise out if it goes into neutral).

Its definitely not easy even for a competent DIYer.

Hope you haven't got the type that uses a solenoid assembly to clamp a throttle cable as FBW wont wrk with it.....when you install cruise on these, as well as the electnic bits, it uses a bowden cable assembly and a vacuum device that taps off the main brake servo, with a connection through the bulkhead to the throttle pedal which it manipulates/holds physically.

A proper install is indistinguishable in operation from OEM but its seriously not something I'd attempt to do because of the potential dangers involved.

 

[Fez_uk]

cruise control = gayyyyyyy

 

[clivvy]

I haven't got cruise control, but I have used it on cars in the US.

Am I right in thinking that when Cruise Control is engaged, the only purpose of the throttle is to increase the speed of the vehicle momentarily while the throttle is pressed down. eg for overtaking a slower vehicle.
When you release the throttle the speed drops to the original setting, maintaining cruise control.

I don't know where I am going with this, but this signal needs to get to the Main Ecu via the Cruise control unit.
This may try to explain Rick's thinking.

But I would have thought that the throttle potentiometer is already there for the Main Ecu to work.

If I get chance I will check out the circuit diagram later on.

.

on my old Honda Prelude, as you suggest, hitting the accelerator allows just that, then reverts back to the set speed, brake takes cruise control off full stop, but some cars have a certain amount of braking required or speed that takes the control off as well, such as hitting 40mph....

 

[rustic]

I think I still have the cruise control unit from my Dad's old Land Rover in my shed.



It measures 9" x 4" x 3"




Instructions to engage cruise control.
When at desired speed, place house brick on the throttle pedal

To disengage cruise control, remove brick. :thumb2

To select lower speed use a smaller brick. :thumb2



Simples..... :lol :lol

 

[rustic]

but some cars have a certain amount of braking required or speed that takes the control off as well, such as hitting 40mph....

Hitting a brick wall, works as well.... but only once. :doh


.

 

[chris1981]

its a spal rg8 cruise control kit i have nearly installed it but need wiring diagram of acp sensor for the signal inputs and outputs to ecu

 

[lacroupade]

its a spal rg8 cruise control kit i have nearly installed it but need wiring diagram of acp sensor for the signal inputs and outputs to ecu

But I don't understand how you are going to operate the throttle pedal? The only throttle input I'm aware of is from the sensor on top of the pedal assembly and thats only controlled by the pedal itself.....on the CA cruise control the unit maintains throttle pedal position as mentioned above, by way of a cable attached to the pedal lever and maintained using a vacuum servo....and thats not the cheapo way of doing it - you can buy cruise units for £60-70 that only use a solenoid to literally clamp the throttle cable in position, so it won't maintain same speed on hills etc..
.
Their Gold cruise costs around £450 plus fitting and it goes on a huge range of vehicles so although not an expert, I would suggest this is the only way of doing it.

Cruise needs to cut out altogether under several circumstances:

1. Gearbox into neutral.
2. Gear change up or down.
3. Braking.
4. Speed exceeds set cruise speed by 10% (typically)
5. Speed lower than set cruise speed by 10% (typically)

AND @ fez

Nothing gay about cruise control mate - back roads of Wales yes, but try doing a 2200 mile round trip like I'm off on tomorrow and you'd crawl out the other end on hands and knees. Its bloody wonderful to be able to put your feet up for 12 hours!

 

[Liam]

Nothing gay about cruise control mate - back roads of Wales yes, but try doing a 2200 mile round trip like I'm off on tomorrow and you'd crawl out the other end on hands and knees. Its bloody wonderful to be able to put your feet up for 12 hours!

Do you mean you drive with your feet up on the dash, or just lie across the back seat?

 

[chris1981]

the cruise control kit will increase the speed and decrease the speed with hills etc , it cuts cruise control system out when the brake or clutch pedal is depressed ,u can buy a lead that connects inbetween the wiring loom connector to the accelerator pedal itself so the when cruise control detects speed loss it sends it own signal to the ecu to keep at same speed but dont list one for terrano,

 

[rustic]

but dont list one for terrano,

What about a Ford Maverick of the same year?

 

[rustic]

Do you mean you drive with your feet up on the dash, or just lie across the back seat?

When I was in the US I overtook a white van, the driver had both his feet out of the window, it was a hot day..

So it does happen.

 

[lacroupade]

the cruise control kit will increase the speed and decrease the speed with hills etc , it cuts cruise control system out when the brake or clutch pedal is depressed ,u can buy a lead that connects inbetween the wiring loom connector to the accelerator pedal itself so the when cruise control detects speed loss it sends it own signal to the ecu to keep at same speed but dont list one for terrano,

It doesn't increase speed on hills, it maintains it - different thing.

And it should also cut out when you go above or below the set cruise speed, using the accelerator, by 10%, and also when you change gear or put it in neutral, otherwise it would rev itself to death. Omit those signals at your peril.

Probably no connector listed because its fly by wire......which is why even a very expensive unit like the Gold Cruise has to resort to the bowden cable and vacuum actuator.....I think you're banging your head against a brick wall mate.

I've had cruise on four of these trucks so trust me I know.

 

[lacroupade]

....and having looked at this SPAL unit the two parts are identical to the stuff supplied by Conrad Anderson so suggest you check their site and give them a call.

 

[lacroupade]

...if it is the same unit, and it looks identical, then you will be short of the vacuum actuator, the bowden cable to the throttle pedal and a gearbox cutout switch....all of which are 'must haves'.

I don't want to be reading in the papers about a Terrano ploughing into the back of a lorry with the throttle jammed....

 

[chris1981]

they dont list one for the ford either, ive measured the readings of accelerator pedal today to see what each wire is reading via a multimeter to try and work it out