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I supported Toymods
Location:
Australia
Registered:
November 2003
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Ingition staying 'On'
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Wed, 18 February 2004 14:11
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I'm wiring up a new ECU to my original harness, but AFAIK I have left all the original wiring intact (bar removing the engine loom and ecu)
Now, I've wired up the new ecu, and I turn the key to 'On' and when I turn it back, the ignition stays on until I disconnect the battery.
I'm guessing this is a relay not clicking off.
Anyone have any ideas? I'm gonna get the car wiring diagrams out tomoz nite and do some tracing, but I'm just wondering if anybody else has had this problem?
Could it be my Immobisiler? (AFAIK I have by-passed the fuel cut off for it)
Thanks ppls
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Location:
Melbourne
Registered:
October 2003
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Re: Ingition staying 'On'
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Wed, 18 February 2004 14:22
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yep i've had that problem before too, but in a 70's celica with a stuck ignition barrel.. 
Your problem, at a guess, is maybe caused by your bypassed cut off relay... What have you connected the trigger wire to?
You can start a continious loop, which only needs to be set off to stay on.
Say the relay is open, (off), then you turn on the igniton, which clicks on (closes) that relay. The power then flows through the relay. If your relay can also be triggered by it's own output, then you have the problem you descirbe.
Or putting it another way:
Ignition is turned on, and turns on relay. Relay powers itself on, ignition turns off, relay continues to power itself on.
Solution, find where the relay is powering itself and kill it..
Oh just read that you by passed the fuel cut, if so, do you mean the relay? If you have, by putting 12V into it, once the ECU turbs on, and then turns on the fuel pump, the fuel pump + is connected to the main ECU +. Power in a simplistic way will flow backwards through that and contune to power the ECU after the ignition is switched offe... (possibly)
Other thing is it could just be a stuck relay!
hope this helps.
[Updated on: Wed, 18 February 2004 14:25]
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Ingition staying 'On'
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Wed, 18 February 2004 14:38
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I just realised what the problem *might* be
My car (and many older Toyota's) have a 'circuit opening relay' that controls a few things, one of them being the fuel pump.
Now the new ECU has its own Fuel Pump relay, so I pulled the 'Circuit opening relay' out to find out which wire goes to the fuel pump so I could wire my new relay straight to the pump (if you get what I am saying).
But I didn't put the relay back in coz I didnt think I needed it.
Any idea if I do?
I'll put it back in first try tomoz nite, and see if that works.
Any other possibilities?
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Ingition staying 'On'
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Thu, 19 February 2004 02:40
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with ign off, check for voltages at the coil side of the appropriate relays (like MAIN, EFI, FUEL PUMP etc),
then with ign on, check the same again, and again after turning ign off (but it staying on)
ign will also turn off if you remove the appropriate relay
if you are replacing the fuel pump relay, you shouldn't need the COrelay. unless it provides power to another circuit..
even so, it shouldn't cause a continuous power up..
have fun,
Cya, Stewart
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Ingition staying 'On'
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Thu, 19 February 2004 02:45
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Well, if I disconnect the battery, reconnect it, I get no Ignition voltages anywhere.
Turn the key to 'On', and I get all the usual voltages at the right places.
Turn the key off, and all those voltages stay until I disconnect the battery again.
The only reason I saw it was because my Low Fuel Light was on (I have disconnected all other warning lights for the moment)
Oh well, tonite could be a long fault finding process, or I'll just drive the car around for a while with a kill switch!
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Ingition staying 'On'
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Thu, 19 February 2004 02:58
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concentrate on the circuit between the ignition switch and the MAIN and EFI relays..
on a KE70 i saw recently (we wired it up from carb to EFI) the IGN from the key went to the MAIN relay coil, and the switched output of the MAIN relay went to the coil of the EFI relay.
in the ignition switch there are two seperate circuits, but i think it is after there you have a problem...
check that the main and EFI relay 'unlatch' by powering them up seperately, WITH a load on them (like light bulb). if your wiring is intact, i would guess that they are latching on...
OR as Hemi215 said, the output of one relay is feeding back to the input of another... for it all to stay on, the main relay has to be powered (or the EFI? check the wiring diagram), so if you find the source of this power, problem solved...
or it's a dodgy relay....
hmm, no bits of cut off wire floating around the fuse/relay box? no shorts anywhere? have fun 
Cya, Stewart
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