air maf sensor

Frankieflowers

Member +
I would disregard the plugs and timing for now, concentrate on the code 22.

I'm guessing that you have retained the original coolant sensors from your 4efe. Can you take a picture of the coolant sensor that was on the 4efte engine please?

I figure it's different (triangular 3 pin connection).
There is a picture where I am holding the connector. That is the original connector and water temp sensor on the 4efte ep91 on my Corolla. The other picture was just taken from the 4EFE engine in my garage. As the wiring go straight to the ECU, I don’t understand why it shouldn’t work properly. It would be different if the wires would go through the firewall and Corolla’s connectors and wire splits. Can you help me understand what to do? Thank you
 

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Jay

Admin
Just trying to establish if the original corolla sensors are the same setup as the early 4efte then you can work out how to adapt them to the later 4efte ECU.

So the fan switch I can see, its not related:

Screenshot_20211007-132233_Google.jpg

You have the earlier version of the coolant temp sensor for the EFI:

Screenshot_20211007-132436_Google.jpg

So can you spot a separate sensor for the coolant temp sensor for the instrument cluster:

Screenshot_20211007-132136_Google.jpg




It should be in the vicinity of the other two. I'm going to guess that its there and already connected if your gauge is reading right.
 

Frankieflowers

Member +
It should be in the vicinity of the other two. I'm going to guess that its there and already connected if your gauge is reading right.
What is unclear to me is that if I pull out the two wire connector of the temperature sensor nothing changes. I tried this morning to see if some thing with change. Could you please tell me those two wires green and brown what exactly do? I just went to see your friend mechanic and he told me that they control that EFI for the air/fuel compensation. as it doesn’t seem to work I’ll probably think that the bulb must be replaced. But why does the engine starts and go high rpm and when it gets warmer the RPM goes to nominal 700? How does the ECU control this without that bulb working well?
 

Jay

Admin
Right so both of those sensors were incorporated into the one sensor (the triangle one that was on the 4efte originally).

The 4efte ECU will be looking for that sensor but it isn't seeing it hence the code 22.

I can't tell from the pictures how your electrician has connected the 4efe and 4efte looms but he needs to get that signal to the right pin in the ECU. I can look up the 4efe ep91 wiring diagrams for reference.

Oh and your idle from cold is handled mechanically by the throttle body waxstat. The ECU doesn't use the coolant temperature signal to drop the revs, it uses it for controlling the air/fuel mixture. Hope that makes sense.
 

Frankieflowers

Member +
Right so both of those sensors were incorporated into the one sensor (the triangle one that was on the 4efte originally).
I’m sorry I am confused. Do you mean that the water temp sensor that I took a picture of was a swapped by my guy without letting me know and the cause of the problem comes from the swap? You mean that the two wire connector on my 4EFTE was cut from the Corolla loom?
 

Frankieflowers

Member +
I can look up the 4efe ep91 wiring diagrams for reference.
Yes it makes sense now and I am thankful. Yes please check out the loom because the guy isn’t 100% available right now and I need to fix this ASAP. I don’t remember why he swapped the sensors.
 

Jay

Admin
The glanza sensor won't fit the corolla loom so he may have used the corolla sensor thinking it would give the same function.

He could have to use that triangular one and just run the wires to the ECU directly.

I can't say for certain what he has or hasn't done, I can only go on whats in the pics tbh. He has done really really well to get the engine up and running to this stage.
 

Jay

Admin
Hopefully this shows the path to the ECU for that connector. If he uses this he can make that newer type glanza sensor work. (Fingers crossed)
 

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Frankieflowers

Member +
Right so both of those sensors were incorporated into the one sensor (the triangle one that was on the 4efte originally).
I want to check for the Starlet Glanza ep91 4efte water temp sensor and it shows a 2 pin connector. 03A50E41-6B6E-4F40-8843-3DE1D1B635B5.png
Are we sure that the FTE engine I bought had the 3 pin plug sensor? The connector on the engine isn’t a Corolla connector. It’s clearly from the Starle loom. I.am confused.
D6C78EDD-AE09-4FF4-99D1-E28027D99171.jpeg
 

Frankieflowers

Member +
The glanza sensor won't fit the corolla loom so he may have used the corolla sensor thinking it would give the same function.
Meaning that the original sensor with the three pins isn’t from the ECU loom but from the car (engine bay) loom instead? Unfortunately I don’t remember when you did the job at this point and I am not sure. I will try to figure out with him on Monday. All I know is that a wire is missing so it will be useless to swap the sensors tomorrow without checking the wiring and finding its original meaning.
 

Jay

Admin
Apologies, I've clearly misread it...

Your old 4efe sensor was the triangle type and the 4efte is using the two separate sensors then?
 

Frankieflowers

Member +
Its E4 in those pages. You can see the new type sensor carried both the gauge signal and the top signal for the EFI system
You have been very helpful. I will check them out tonight and talk to my brother. But definitely only my electric guy will have to fix this on Monday night.
Yes he did a good job even if it took two months and we still have to finish the air conditioning wiring to the Corolla loom.
 

Frankieflowers

Member +
Apologies, I've clearly misread it...

Your old 4efe sensor was the triangle type and the 4efte is using the two separate sensors then?
Exactly. That what it seems like. You can see that the 2 wires in the pictures are from the 4efte engine loom. They haven’t been cut
 

Jay

Admin
Right in that case you just need to make sure the ECU is seeing the signal from the main sensor. Its that which triggers the 22 code and causes starting issues.
 

Jay

Admin
More pages to confuse matters further..

Could only find this in English in the 5e manual :
 

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i'm just fact checking here
you have removed a 4efe engine and installed a 4efte engine from an EP91 glanza?

is the engine bay wiring loom from an EP91 glanza as well? ---if so, it will have the triangular gray 3 pin coolant temperature sensor

i can tell you that if this connector is disconnected on my ep91 glanza, the car will not start

if you are running the ep91 glanza ecu AND using a different coolant temperature sensor (2 pin or 1 pin) then it will be looking for the correct signal (3 pin sensor), which it may not be getting and is contributing to your codes
 

Frankieflowers

Member +
i'm just fact checking here
you have removed a 4efe engine and installed a 4efte engine from an EP91 glanza?

is the engine bay wiring loom from an EP91 glanza as well? ---if so, it will have the triangular gray 3 pin coolant temperature sensor

i can tell you that if this connector is disconnected on my ep91 glanza, the car will not start

if you are running the ep91 glanza ecu AND using a different coolant temperature sensor (2 pin or 1 pin) then it will be looking for the correct signal (3 pin sensor), which it may not be getting and is contributing to your codes
Hi. All I know is that I received the full EP 91 for EFTE engine in a box with his native ECU loom and engine bay loom. It came from a half cut so nobody changed anything. Probably the version I have without automatic transmission has the two pin water temp sensor. The engine I took out which is the 4EFE with electronica ignition has the three pin connector.
 
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