IronTanuki

So what I thought would be a relatively straightforward install of an HKS turbo timer has turned into a huge pia. As it stands now, I can’t get the TT to stay on after the key has been removed from the ignition, but it functions normally while the car is on.

I connected the HKS turbo timer the following way after verifying the wiring colors for the TT itself:
- Red wire on TT to solid yellow wire on ignition harness (constant 12v)
- Green wire on TT to black wire with a yellow stripe (reads 10.something volts)
- Blue wire on the TT I’ve tried connecting to the input of the relay, to the accessory power from the cigarette lighter, and unconnected but seems to make no difference.

At the security system I have the black wire with a yellow stripe attached to a 12v 10amp SPDT relay with low coil resistance from RadioShack. I have tested and verified that this relay will allow the alarm to be armed when there is 12v flowing in but otherwise it will not.

I've noticed that when the blue wire is not connected to anything it doesn't have any voltage while the turbo timer is active (key still in the ignition), which may be an issue based on some other install guides I've been reading.

Issues:
- Car would not start after I accidentally snipped an extra wire on the security module, found this by pulling codes and reconnected the wire with butt splice and the car started again
- After getting all the other wires connected correctly with I had the ground hooked up to the screw behind the metal plate under the steering wheel but ran into a strange issue where after taking the key out the car would remain on but the TT would turn off. Car would remain on indefinitely even if you pulled the harness out of the back of the ignition switch!! I had to pull the ignition fuse out to turn the car off.
- Once a better ground was found, the turbo timer would come on and off with the car but will not keep it on like expected.

In addition the CEL is now on and the car is throwing the following codes:

PCM
U0155 Communication error to instrument cluster
U0167 Communication error to keyless control module
RXE
P0000

I’ve tried resetting the ECU via AccessPort but they return afterwards. The P0000s will only get thrown once the engine is turned on (I believe).

I have currently disconnected all the wires from the TT but the CELs remain. The only part of the install that remains on the car is the security module relay and since the alarm follows the standard arming rules when testing it doesn’t appear to be the culprit.

I used this thread as a guide:
https://www.rx8club.com/showthread.p...+timer+install

Any insight would be appreciated.

NgoRX8

iTrader: (1)

I don't know what those codes are, but...

Red wire should be Constant
Green wire should be Ignition

NgoRX8

iTrader: (1)

Also, if i remember correctly, the Blue wire (accessory power) should be wired to the relay. The relay should also be grounded. Therefore when there is power in that relay, it keeps the circuit on the other end of it open. When the turbo timer shuts off, the relay will close that circuit (the black wire with yellow stripe) so it can arm the alarm.

IronTanuki

According to both the instructions in the thread and the FSM the solid yellow which the red wire is hooked up to is constant 12v. I have tested this with a volt meter to verify. The green wire should also be hooked up correctly I have verified that it gets voltage only when the key is in the ON position.

This is how I had it wired (blue to relay) but it's still not making any difference. I forgot to mention that the relay IS grounded to one of the bolts around the shifter. I have also verified that this ground works with the volt meter. I've done some tests hooking up the cigarette lighter accessory 12v to the input of the relay and that successfully causes the relay to open/close (you can hear it click) as the power is supplied/cutoff.

Right now the problem really shouldn't be the alarm relay and I'm wondering if the HKS TT just doesn't work on the RX-8 due to the low voltage ignition signal and I need to pick up a Greddy one instead or if the unit itself is defective.

NgoRX8

iTrader: (1)

If there is nothing wrong with the unit, it should work.

I use the HKS Turbo Timer as well.

Is the Black wire grounded?
Gray wire? Is it wired to the parking brake grounding wire? (you can ground this anywhere if you always want the TT to come on) The parking brake wire is grounded when the handle is lifted.

IronTanuki

The black wire on the TT is ground to the metal rod on the right side under the steering column.

The grey wire is hooked up to the parking break's wire but I noticed there was NO voltage change on the wire depending on if the handbreak was up or down but the dash light was functioning properly. I will try grounding the parking break and see if the turbo timer stays on.

Do you know the voltage on the bluewire in relation to the state of the TT? When the car is on normally does your TTs blue wire have a +12v flowing through it? Mine doesn't which leads me to believe the unit is defective but I didn't know if the blue wire only had +12 when the turbo timer was in "keep the car on" mode.

NgoRX8

iTrader: (1)

check your wire tap/connections.

The blue wire only receives +12V when the turbo timer is counting down. When the car is running normally, it has no voltage. Regardless, the Blue wire isn't needed for keeping the car running. It's there for the relay and arming of the alarm.

Wiring in:
Red to Constant
Green to Ignition
Black to Ground
Gray to Ground

should get the TT to work. What it does is use the power from the Red (Constant) to feed the Green (Ignition) during the countdown.

IronTanuki

Thanks so much Ngo! Thanks to your input I finally got everything squared away tonight.

I was using the red splicer that the TT shipped with to tap into the parking break and I guess it wasn't breaking the insulation... after trying the parking break to ground everything worked as expected

I even got rid of the CELs, while the AccessPORT didn't seem to be able to clear them my brother had a universal OBD2 code puller and after clearing those codes the CEL went away and it is no longer throwing any codes.

slyhound

hey guys mike here i have a greddy TT and dont know how to install it. anyone have photos of the install to make things a bit simpler? ummm the red,black,green,blue that come out of the TT.i have another harness that connects to the end of thoughs wires and then their just red,green,blue. any help on what wire goes where...my number is 561 3855281 email is slyhound@aol.com or ill check back ...thnks everyone.