air maf sensor

Frankieflowers

Member +
Took a look through the ep91 manuals (not sure how close they are to the 4efte).

Is there a possibility of adapting a glanza tachometer to the corolla cluster? I found the remains of one from an automatic V in the stockpile earlier.
I am kind of desperate trying to figure out why the car doesn’t start at first crank overnight. I recognized the fact that the fuel doesn’t stay in pressure in the fuel rail but goes back into the tank. So I changed the fuel pump and checked the pipes. Nothing changed. So I changed the fuel rail valve. Still didn’t solve the problem. Do you have any idea? Thank you
 

Jay

Admin
Not sure on the tacho swap but here's a few pics to compare to your corolla unit.
 

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Frankieflowers

Member +
You mentioned a code for the coolant temp sensor. This can affect cold starting so I would start there.
That works fine. There is no fuel when I crank overnight. The return rail doesn’t keep the correct fuel pressure so the fuel returns to the tank. Pipes are connected correctly. I swapped the fuel rail valve with the 4efe but it didn’ solve the issue. Is there a fuel rail return valve ir is there there only one on the inlet?
 

Jay

Admin
The gauge may work fine but the code 22 signals that the ECU isn't getting a good signal from the temp sensor.

This will affect cold starting as the ECU won't add enough fuel (or too much) to start.

If you can get that code sorted you may find it helps.
 

Frankieflowers

Member +
The gauge may work fine but the code 22 signals that the ECU isn't getting a good signal from the temp sensor.

This will affect cold starting as the ECU won't add enough fuel (or too much) to start.

If you can get that code sorted you may find it helps.
We swapped the sensors between engines because the Corolla dashboard wouldn’t read the signal from the Starlet sensor. I don’t understand why the water temp sensor would have anything to do with fuel pressure return in the tank. When I crank I hear the fuel pump working. The air regulator works fine because as soon as the fuel gets to the igniter‘s the engine starts perfectly and the RPM goes around 1500 stroke and lowers after a few minutes when the engine starts to warm up. I was trying to figure out if there is a valve that should shut when the engine turns off In order to keep the fuel in pressure. I will go test the fuel pressure as soon as my mechanic has time. This is very weird.
 

Jay

Admin
There are two signals from the coolant sensor. One goes to the dash to operate the gauge and the other goes to the ecu to control fuelling.

The glanza one would have been a three pin unit carrying both. Was the corolla one the same?

A code 22 will affect cold start giving the symptoms you are describing so it would be worth sorting.

If fuel pressure is the actual issue you may have a clogged fuel filter causing issues. The regulator is the other obvious culprit. (Test procedure for the 4efe should be similar)
 

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Frankieflowers

Member +
There are two signals from the coolant sensor. One goes to the dash to operate the gauge and the other goes to the ecu to control fuelling.

The glanza one would have been a three pin unit carrying both. Was the corolla one the same?

A code 22 will affect cold start giving the symptoms you are describing so it would be worth sorting.

If fuel pressure is the actual issue you may have a clogged fuel filter causing issues. The regulator is the other obvious culprit. (Test procedure for the 4efe should be similar)
This is interesting. The guy who managed the electric part of the swab switched the sensors because he thought, without looking at the diagrams, that the sensor from the Corolla engine would be better because he thought he would manage only the cluster water temp level. I am going to figure out how to modify the Corolla loom in order to get the Starlet ECU see it’s native sensor.
 

Jay

Admin
That sounds like the ecu isn't getting that second signal at all which would trigger the code 22 (and starting problems).

Ask him to re-examine it, hopefully just needs another wire added.
 

Frankieflowers

Member +
That sounds like the ecu isn't getting that second signal at all which would trigger the code 22 (and starting problems).

Ask him to re-examine it, hopefully just needs another wire added.
Exactly. The only problem is that the guy is unavailable at the moment so I will have to figure it out myself. I appreciate your support and I would love to have the book to see all the procedures. Hopefully my brother will help me out when you have some spare time.
 

Frankieflowers

Member +
That sounds like the ecu isn't getting that second signal at all which would trigger the code 22 (and starting problems).

Ask him to re-examine it, hopefully just needs another wire added.
What do you think about the error 42? We bridged those two pins in the automatic transmission connector but I still see the error. I read the error description and it says that it might be the N and P ECU reading. How do you think I could bypass the error? The guy who posted the video of the auto to manual gearbox on a Starlet told me he doesn’t have any engine check light on.
 
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Jay

Admin
Code 42 relates to the speed signal to the ECU.

Basically the cluster gets the speed from the gearbox then sends it to the ECU. If its not getting this the ECU will throw a code and reduce performance to keep things safe.

Not 100% sure if your corolla uses the same mechanical speedo cable as the starlets though?

I'd be starting with the the wiring between cluster and ECU, making sure its getting a signal and follow the line back.
 

Frankieflowers

Member +
Code 42 relates to the speed signal to the ECU.

Basically the cluster gets the speed from the gearbox then sends it to the ECU. If its not getting this the ECU will throw a code and reduce performance to keep things safe.

Not 100% sure if your corolla uses the same mechanical speedo cable as the starlets though?

I'd be starting with the the wiring between cluster and ECU, making sure its getting a signal and follow the line back.
As the tachometer works crazy because of the Corolla modern cluster, we used in oscilloscope to pick up the signal input in the ECU and out. What do you mean with speed signal in the tachometer? The Corolla gets the speed from a mechanic wire straight from the gearbox that is it’s own. We changed the resistor on the tachometer to limit the madness it creates with the dirty signal and high voltage coming from the coil. The reading is better and it doesn’t go nuts but it still needs to be limited because the pools square wave is too dirty to be read properly by the modern tacho. Tell me more about the performance limitation that the ECU is running because of speed signal? what do you mean is that the engine will not run properly until I clean the signal from the engine to the cluster for the RPM and out to the ECU?

I added some pictures to show you the sensors and the last one shows the starlet water temp sensor and it shows that it has only one pen which means one wire going to its original loom. So how can this sensor have more functions? The engine comes from an EP 91 automatic gearbox Glanza V. Let me know what you think. Thanks
 

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https://www.toyotagtturbo.com/commu...1c301c-0275-4b26-98ed-b18d1574cb8a-jpeg.7031/

from my memory, that last picture with the green single wire sensor/connector is the ep91 fan switch i believe---it sits on the thermostat housing and points to the firewall

the coolant temperate sensor is a 3 wire connector and gray sensor with a triangular shape that sits under the distributor in the water housing,,,if i remember correctly...i think this one sends a signal to the ecu/cluster

hopefully some one else can verify, i'm certainly not into electronics
 

Frankieflowers

Member +
https://www.toyotagtturbo.com/commu...1c301c-0275-4b26-98ed-b18d1574cb8a-jpeg.7031/

from my memory, that last picture with the green single wire sensor/connector is the ep91 fan switch i believe---it sits on the thermostat housing and points to the firewall

the coolant temperate sensor is a 3 wire connector and gray sensor with a triangular shape that sits under the distributor in the water housing,,,if i remember correctly...i think this one sends a signal to the ecu/cluster

hopefully some one else can verify, i'm certainly not into electronics
Yes, the sensor shown in the last picture is the one you see in the first picture connected to the thermostat housing. It has only one pin inside. You’re saying that this one works only for the fan? I have to double check to find the three pin gray connector you’re talking about under the thermostat housing.
 

Frankieflowers

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Jay

Admin
So which version does the corolla use, the three pin switch (like ep91) or the two separate sensors (ep82)?

And yes the single pin switch on the thermostat cup is the fan switch, doesn't affect temp gauge signal.
 

Frankieflowers

Member +
I swapped the engine and we are talking about ian ep91 with AT on a 4efe Corolla MT gearbox.
Please check out the picture where I am holding the connector from the water temperature sensor. You can see the color of the wires as well. So one wire goes to the cluster for the temp istrument and the other goes to the ECU and controls the fule pressure for HOT/COLD crank? Can you tell me why the fuel doesn’t stay in pressure in the rail and the car needs 6/8 crank tempts before starting properly? Is it really juat a temp sensor @Jay ? I don’t know what to do anymore. My brother told me it could be a failing injector that doesn’t hold the fuel when the car is parked.th is is why it also explodes some fuel on low RPM (that could be timing caused by COIL) Someone else told me it could be the timing belt in the wrong position or the coil timing that doesn’t allow the to start properly when cold. Someone else told me that it could be the spark plugs. I bought the the DENSO SK20R11 that should be the proper version I found on the Toyota spare parts website. Can you confirm that these are the correct spark plugs? The engine has a sticker that crosses the electrode type with the metal L and shows the other version. I am not sure about that. I read that most people by the NGK BKR5E-11 heat 6 that are definitely the correct ones but maybe the exact same as the DENSO. What do you suggest?

I am showing another connector that I didn’t connect because the gearbox is different. Do you know what is it about?
 

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Jay

Admin
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).
 
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