Warninglight will not turn off or flash when short E1 and TE1, after 4E-FTE swap.

[Evolution]

Hi starlet people

I have just fittet a EP82 4E-FTE in my N/A EP91. I run with 2 engine harness, one to control the engine (21pin connector) and one for all the other stuff from the main fusebox to the inside of the car.
But I have a problem with my engine warning light. It won't turn off when I start the car, and when I connect E1 and TE1, it dont flash, it just stays on. And I can not get any connection with my Toyota IT tester.

When I connect the 4E-FE ecu, it works as it should. I use the exact same 16pin connector at both ECU's, and as I can see, the 26pin connector have nothing to do with diagnostic.

I messure +0,92V at pin 10 to the engine warning light, and as I remember, the warning light will turn off, when it are positive on both side of the bulb. So it should not be turned on, unless the ECU puts ground to the wire. Am I right???

Could my ECU be fried or what???

Please let me know if you have a suggestion


Best Regards from Denmark

 

[weeJohn]

I am a bit confused about your connections, you still have the complete n/a loom in, connected to the engine bay fuse box but the 26 pin ecu plug is not plugged in, is that correct?

And you have also an EP82 loom connected to the engine and the 26 pin plug connected to the ecu, but no connection to the interior loom or main fuse box?

 

[Evolution]

Yes, thats correct. The EP82 loom is made from scratch, and only conected to the engine - watertemp, tps, injectors ect (like when you build a megasquirt loom from scratch). And only connected to the ECU at the 26pin connector, and of couse some 12v and eath as the original.
The 16pin are the original from the EP91 car, just pulled out the old 4E-FE ecu and plugged it into the 4E-FTE ecu.

The reason why I did this, is because I did't have a 4E-FTE loom, just some connectors, and because it's illegally here in Denmark, so I have to switch every second year, to make it pass MOT test.

The 26pin is only from sensors and to ignition and injectors, it have nothing to do with diagnostics, other than trouble codes if the sensors are disconnected or damage. And the main problem, is to make the engine warning light flash, when i short E1 and TE1, or connect my IT tester.
It works when I connect the 4E-FE ecu, but not when i switch to 4E-FTE ecu.

 

[weeJohn]

Hard to say what exactly it might be as I dont know how you connected it but from doing this job a few times myself I do know the pin outs on the EP91 n/a ecu and EP82 pinouts are not in the same order. The fact your diagnostics are ok with the 4EFE ecu makes me think the wires are running into a different place for the 4EFTE ecu, so its not seeing everything as it should.

There is also some wiring differences in the 4EFE loom and the 4EFTE loom so you might not be powering some things up. I would start with checking the AM2 feeds to the coilpack and injectors, then look into the order the 4EFTE sensors are connected to the 4EFTE ecu plug.

 

[Evolution]

Thanks. I have locatet the error, the ECU was broke. I fitted an other one and it works perfectly now. Only problem now, are the knocksensor detect knocking when I start the engine. But I will try to change the sensor.

If anyone knows how I can fix the old ECU I will like to hear about it. My brother can mayby repair it, so I can use it for an other project.

 

[Sagittarius]

are you using a shielded wire for your knock sensor? that wire MUST be shielded...because it can pickup interference easily.

 

[Evolution]

Yes, it is shielded. But the second ECU, have been in the war, and are also defekt. Thats causing the problem with the knock error. It run perfectly with my friends ECU, so I'm looking for a cheap EP82 4E-FTE M/T ECU