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1993 HONDA TODAY wiring


RightsBlue

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hey guys,

I English is a weak, we hit a sentence using the google translation.

I want to run a Honda "Today" car on the LINK atom G4 +.
I'm making a harness for that, but it doesn't work until the engine starts.
This is the state of the harness currently created.
・ ECU can be started without any problem
・ ECU power supply is 12V or more
・ Intake temperature and throttle can be recognized.
・ No voltage comes to crank, cam, water temperature, O2
・ Throttle is input incorrectly to the intake pressure
・There is no problem with the ignition coil and injector.

Images such as the current harness and trigger waveforms are attached.
Anyone can help me.

Thank you.

The Japanese language is translated below.

吸気温度 = intake air temp

水温 = water temp

吸気圧力 = intake pressure , MAP

センサ = sensor

 

JA4 wiring.webp

harness.xlsx

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Im not sure how much help I can offer since it is a japan only vehicle we have no info here or wiring diagrams etc.  I assume all factory data will be japanese only which may not be very useful to me.  If you have a link to a factory wiring diagram please share it and I will take a look to see if I can help.

Your attachement "JA4 wiring" isnt available.

 

I will also ask user @Mach if he can maybe offer any help, I know he has a E07Z engine with a Link ECU so maybe he has some advice or knowledge.

 

 

 

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Your wiring in the .xlsx file appear to be mostly correct, But I think there are potentially 2 small mistakes:As

  1. Pin A19 - I think this is just a signal from the igniton switch to tell the ecu that the engine is cranking.  This should be connected to a digital input, not an aux output.
  2. Pin A7 & A8 (Aux 4) - I think this is actually to control the fuel pump relay, not the main relay.  

As for the crank and cam sensor not working, my only thought is from the wiring diagram it is not clear which pins are ground and which pins are signal.  So it maybe worth trying to swap D5 with D6 and swap D10 with D9 as sometimes you will find the sensor, wiring or factory ecu connects one of those pins to ground.

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18 hours ago, Adamw said:

I will also ask user @Mach if he can maybe offer any help, I know he has a E07Z engine with a Link ECU so maybe he has some advice or knowledge.

Hello.

I'm using LINK ECU by piggy back and sensor inputs are branched off from the factory ECU.
Therefore, I am sorry that I don't have much advice for wiring.
In temperature calibration, "Honda Type A" should be available. 

in Japanese:
私はLINK ECUをサブコンとして利用しており、センサー信号は純正ECUから分岐させています。
そのため、申し訳ないですが、配線に関してはあまり参考にならないかと思います。
温度センサーの校正テーブルについては、"Honda Type A"が適合するはずです。

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Unless you have a special reason, there is no need to keep the normal ECU.
The trigger pinout seems to be correct before the change. It would be reluctor sensor, therefore no voltage would be output when the engine isn't running.
(However, you may need to switch the +/- because Honda engine has reversed rotation direction.)
I think the connection of LG1/2 is to GND (not shield).
The wiring is different from my vehicle, so I am not sure.

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  • 3 months later...

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