How to wire in an OBD2 port on 1NZ Charade?

[jdolondriz]

I dont think this has been done. I will add a fuse to both to be sure. Wire going to BATT (D3) and B+ (D1)?

[jdolondriz]

Would these two work? Are they 1.5?

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[Hassan1991]

This one. Although confirm your wiring again because 2.1v usually wouldn't even connects with the KWP cars.

[jdolondriz]

should the wire going to BATT of ECU be always ON/live or directly tapped to battery +12v?

[jdolondriz]

It seems i wired it wrong. Even with new obd, it wont communicate with ecu. No sensors, only knock sensor. Tach is working though. Which ones need rewire?

[Hassan1991]

TC should be at 13 no in obd2 connector
Sil at 7
Taco at 9
This is how it's wired?

[hasankhurshid29]

For torque pro to work you need to add these strings in profile.
If you have paid Torque pro app you will have toyota jdm option

[OwaisYunus1]

Yes, the wire going to the BATT pin needs to be live at all times. This helps the ecu retain its memory, all of what it has learned while running after the battery was connected. In case its not live at all times and only gets 12v when the ignition is turned on, each time you turn the car off, the memory will be cleared and it'll start the learning process again each time you start the car. Which means that it will never have the ideal fuel mixture, idle speed, etc.

The +B and +B2 however need to get 12v through a relay which is energized when the ignition switch is turned on. Again, emphasis on both being fused.

[jdolondriz]

Yeah, This is how it's wired. But it's working now. I added strings in Torque profile. Thank you so much for the help.

[jdolondriz]

Thank you so much for this. It is now working.

[jdolondriz]

I will get this done. Currently, BATT is wired through ignition. This might be the problem why it is having rough idle on initial start then disappears after a short while.

BATT is fused and wired directly at 12v+ of battery?

+B and +B2 are all 12v+ going to the ECU from a relay when ignition is turned on?

Thank you so much for this.

[jdolondriz]

Thank you so much for all the help. OBD is now working. I just have a followup question. I currently have a different power steering installed. Therefore, there is no power steering pressure sensor. When I scan I have power steering pressure sensor high circuit error. Is there a way to remove this permanently as I don't really have a hydraulic power steering and sensor?

[Hassan1991]

If you use car scanner obd2 you don't need to add a string it's all there already.
Pressure sensor has a certain resistance. Try adding that value resistor in the pressure sensor connector.

[OwaisYunus1]

Yes, that is correct. Regarding the power steering pressure sensor, I havent had to bypass this in the past, I had the correct power steering pump installed. As @hassan1991 suggested, I'm guessing the pressure sensor works on the principal of variable resistance. When the engine is running, the resistance between the legs of the sensor would be different and when you turn the steering wheel to complete lock while running, it would have different resistance to inform the ecu to increase engine idle speed. If you could get a hold of a working vehicle with a similar setup, you can check the resistance under both conditions and then use a resistance of the idle speed value across the pins.
I've searched for this data in the material that I have but couldnt find it. This resistance value may already be available online though.

[jdolondriz]

Would you happen to know the resistance?

[Hassan1991]

No. Service manual contain such data.
Or you can measure it.

[jdolondriz]

Found it on the net. Values should be between . 28v and 4.9v. Am I right with my understanding? I should get it to . 28v?

Also in the not connected socket 1 = e2. 2 = signal. 3 = vc
Where should the resistors be connected?

Thank you

[jdolondriz]

My charade had EPS installed already prior to the swap. Which is also the reason why I didn't install the hydraulic power steering. In this case, would the ECU have a signal that I could connect to the EPS? Originally, the EPS is connected to the (-) ignition coil of the CB23 engine.

[Hassan1991]

3 wire sensor works slightly differently. Signal wire returns voltages between 0-5v
You can put a potentiometer between these 3 wires
And adjust it to about 2.5v ( between signal wire and ground ) and see if check light turns off.

[Hassan1991]

Eps needs rpm and speed signal from ecu.